CN101299146B - Antenna and radio-controlled watch with the antenna - Google Patents

Abstract

Provided are an antenna and a radio-controlled watch having the antenna, the antenna having: a rod-shaped core (220) wound with a winding wire (230) at the center; a plurality of magnetic members (242-1, 242-2) , which are spaced apart from the core along the axial direction of the wire wound on the core, and are respectively arranged in the axial circumferential direction of the core; and a fixing member (279), which fixes the core and the plurality of magnetic members to each other. The radio-controlled watch has the antenna and a watch body in which the antenna is arranged.

Description

Antenna and radio-controlled watch with the antenna

This application is a divisional application, the application number of its parent application: 2004100835498, the application date: 2004.10.9, the name of the invention: antenna and watch

technical field

The invention relates to an antenna and a radio wave watch with the antenna.

Background technique

At present, some countries (for example, Germany, Britain, Switzerland, Japan, etc.) send long-wave standard radio waves with time data, that is, time codes. Among them, in Japan, 40 kHz and 60 kHz long-wave standard radio waves amplitude-modulated with a time code in a predetermined format are transmitted from two transmission stations (Fukushima Prefecture and Saga Prefecture). The time code is sent out as a frame (flame) with a period of 60 seconds for every update of the minute of the accurate time, that is, every minute.

In recent years, so-called radio-controlled watches that receive such time codes and correct current time data have come into practical use. The radio-controlled watch corrects the current time built in the radio-controlled watch by receiving a standard radio wave through the built-in antenna at a predetermined time, amplifying and modulating it, and interpreting the time code.

However, a rod antenna is generally used as a receiving antenna built in a radio-controlled watch. A conventional antenna has a rod-shaped core formed of a magnetic material such as ferrite or amorphous, and a coil in which a wire such as copper is wound around the core.

And, when this antenna is placed in a magnetic field generated by a standard radio wave (hereinafter referred to as "signal magnetic field"), this magnetic field acts on the antenna as follows. Wherein, the standard electric wave is an alternating electric wave, and its magnetic field line part is an alternating magnetic field whose magnitude or orientation changes periodically.

Conventionally, when a core is placed in the signal magnetic field so that its axis is parallel to the direction of the magnetic field, the magnetic flux of the signal magnetic field (hereinafter referred to as "signal magnetic flux") is more concentrated in the core with a higher relative permeability than in the surrounding space. place.

In addition, when AC power is supplied to the coil of the antenna, a magnetic flux corresponding to the temporal change of the AC current flowing through the coil (that is, changes in direction and magnitude) is generated.

Therefore, when the antenna is placed in the signal magnetic field, the signal magnetic flux is concentrated at the core and intersects with the coil chain. In the coil, according to Lenz's law, it is generated as in the direction that hinders the change of the signal magnetic flux inside the coil. The induced electromotive force V like the magnetic flux. Wherein, the signal magnetic field is an AC magnetic field, and the magnitude and direction of the signal magnetic flux vary periodically. Accordingly, the induced electromotive force becomes AC power, and the generated magnetic flux becomes an AC magnetic field whose magnitude and orientation periodically change with the temporal change of the signal magnetic flux.

And, the induced electromotive force V generated in the coil is detected by a receiving circuit connected to the coil. The receiving circuit includes a tuning capacitor Cress and a loss impedance Ra for tuning to a standard radio wave (40kHz or 60kHz) to be received.

In the conventional antenna (rod antenna) configured in this way, the reception sensitivity of standard radio waves depends on the strength of the magnetic field (that is, the magnetic flux density) inside the coil. Therefore, there is known an antenna that can capture more magnetic flux by increasing the cross-sectional area of both ends of a core (magnetic body) in order to allow more signal magnetic flux to pass through the coil and improve reception sensitivity.

However, in the above-mentioned conventional antenna, loss of signal magnetic flux inevitably occurs.

(1) Loss of signal magnetic flux occurs when part of the signal magnetic flux passes through both ends of the coil (transverse).

(2) When part of the signal magnetic flux passes outside the coil, loss of signal magnetic flux or reduction in reception efficiency occurs.

(3) In addition, when there is metal in the vicinity of the antenna, a part of the magnetic flux generated in the space including the metal part passes through the metal, and a loss occurs. That is, when a part of the generated magnetic flux passes through the metal, an eddy current flows through the metal, and eddy current loss occurs. In this regard, it is considered that the coil and the metal are magnetically coupled by a predetermined coupling coefficient k, and the receiving efficiency of the antenna decreases because a part of the electric power (induced electromotive force V) generated in the coil is consumed by the metal.

Contents of the invention

In view of the above circumstances, an object of the present invention is to provide an antenna and a wristwatch that minimize the loss of signal magnetic flux generated in an antenna (especially a rod antenna) and improve radio wave reception efficiency.

SUMMARY OF THE INVENTION The present invention has the following configurations in order to achieve the above objects.

That is, the antenna of the present invention includes a core, a winding wire wound around the core, and a magnetic body covering both ends of the winding wire and an outer peripheral portion of the core outside the winding wire.

In addition, the antenna of another invention is characterized in that:

have:

rod core,

a winding wire wound on the outer periphery of the central portion of the core,

two covering parts made of magnetic material for covering the outer peripheries of the both ends sides of the winding wire respectively,

Annular gaps formed between the inner circumferences of the two coatings and the outer circumferences of the cores on the facing sides of the two coatings;

Both ends of the winding wire are inserted into the annular gap.

The watch of the present invention is characterized in that it comprises:

An antenna having a core, a winding wire wound on the core, and a magnetic body covering both ends of the winding wire and the outer peripheral portion of the core outside the winding wire;

a timecode generating mechanism for generating a standard timecode based on received radio waves received by the antenna;

A timekeeping mechanism that keeps track of the current moment;

Correction means for correcting the current time data counted by the timekeeping means based on the standard time code generated by the time code generation means.

In addition, the antenna of another invention is characterized in that:

It has: a rod-shaped core, a winding wire wound around the central part of the core, and a plate-shaped magnetic member arranged opposite to the core at intervals along the axial direction of the core;

The magnetic member is composed of a plurality of magnetic pieces spaced apart at positions facing the winding portion of the core.

In addition, the antenna of another invention is characterized in that:

It has: a rod-shaped core, a winding wire wound around the central part of the core, and a plate-shaped magnetic member arranged opposite to the core at intervals along the axial direction of the core;

The length of the longitudinal direction of the said magnetic member is shorter than the length of the winding part of the said core.

In addition, the antenna of yet another invention is characterized in that it has:

rod core,

the winding wire wound around the central portion of the core,

a plate-shaped magnetic member disposed opposite to the core at intervals along the axial direction of the core,

A fixing member for integrally fixing the core and the magnetic member.

In addition, the antenna of other invention is characterized in that it has:

rod core,

the winding wire wound around the central portion of the core,

a plate-shaped magnetic member disposed opposite to the core at intervals along the axial direction of the core,

A fixing member for integrally fixing the core and the plurality of magnetic members arranged in the axial circumferential direction of the core.

The watch of the present invention is characterized in that:

Equipped with an antenna, and a watch body with the antenna installed inside

The above-mentioned antenna has a rod-shaped core, a winding wire wound around the central portion of the core, and a plate-shaped magnetic member disposed opposite to the core at intervals in the axial direction of the core,

The magnetic member is composed of a plurality of magnetic pieces spaced apart at positions facing the winding portion of the core.

Description of drawings

1A-1D are diagrams showing an antenna according to a first embodiment of the present invention, wherein FIG. 1A shows a front view of the antenna, FIG. 1B shows a right side view of FIG. 1A , and FIG. 1C shows a cross-sectional view in the IC-IC direction of FIG. FIG. 1D is a cross-sectional view along the ID-ID direction of FIG. 1A .

FIG. 2 is a diagram showing the effect of a signal magnetic field on the antenna according to the first embodiment of the present invention.

3 is a diagram showing an embodiment in which a magnetic body is disposed between the antenna and metal according to the first embodiment of the present invention.

Fig. 4 is a plan view of a wristwatch incorporating the antenna according to the first embodiment of the present invention.

Fig. 5 is a partially broken sectional view of the watch of Fig. 4 .

Fig. 6 is a block diagram showing the internal configuration of the wristwatch shown in Fig. 5 .

7A to 7E are diagrams showing the antenna of the first embodiment of the present invention formed of amorphous, wherein FIG. 7A shows a front view of the antenna, FIG. 7B shows a cross-sectional view along the VIIB-VIIB direction of FIG. 7A , and FIG. 7C shows a diagram 7B is a right side view, FIG. 7D is a horizontal sectional view of FIG. 7A , and FIG. 7E is a sectional view along VIIE-VIIE direction of FIG. 7A .

8A and 8B are diagrams showing a composite antenna of the first embodiment of the present invention made of amorphous and ferrite, wherein FIG. 8A shows a front view of the antenna, and FIG. 8B shows a cross-sectional view taken along line VIIIB-VIIIB of FIG. 8A .

9A-9D are diagrams showing an antenna according to a first embodiment of the present invention in which a notch is provided on a covering core, wherein FIG. 9A shows a front view of the antenna, FIG. 9B shows a right side view of FIG. 9A , and FIG. 9C 9A is a horizontal cross-sectional view, and FIG. 9D is a cross-sectional view in the LCD-LCD direction of FIG. 9A.

10A-10C are diagrams showing the antenna according to the first embodiment of the present invention in which the opposing surfaces of the cladding cores facing each other are obliquely formed, wherein FIG. 10A shows a front view of the antenna, and FIG. 10B shows a vertical view of the antenna in FIG. Cross-sectional view, FIG. 10C is a cross-sectional view of a watch device incorporating the antenna of FIG. 10A .

11A and 11B are diagrams showing the antenna according to the first embodiment of the present invention in which the gap is filled with a nonmagnetic material, wherein FIG. 11A shows a front view of the antenna, and FIG. 11B shows a vertical cross-sectional view of FIG. 11A .

12A and 12B are diagrams showing the antenna of the first embodiment of the present invention in which the covering core does not cover the end of the coil, wherein FIG. 12A shows a front view of the antenna, and FIG. 12B shows a vertical cross-sectional view of FIG. 12A .

13A to 13D are respective configuration diagrams showing an antenna according to a second embodiment of the present invention.

FIG. 14 is a diagram showing the effect of a signal magnetic field on the antenna according to the second embodiment of the present invention.

15 is a plan view showing a wristwatch incorporating an antenna according to a second embodiment of the present invention.

16 is a cross-sectional view showing a wristwatch incorporating an antenna according to a second embodiment of the present invention.

Fig. 17 is a block diagram showing an internal configuration of a wristwatch according to a second embodiment of the present invention.

18A to 18D are configuration diagrams showing an antenna according to a third embodiment of the present invention.

19A to 19C are configuration diagrams showing an antenna according to a fourth embodiment of the present invention.

FIG. 20 is a diagram showing the effect of a signal magnetic field on the antenna according to the third embodiment of the present invention.

21 is a configuration diagram of an antenna in which a magnetic member and a core are integrated in a second embodiment of the present invention.

22 is a configuration diagram of an antenna in which a magnetic member and a core are integrated in a fourth embodiment of the present invention.

23A is a configuration diagram of an antenna in which a magnetic sheet is formed into a curved shape in the second embodiment of the present invention, and FIG. 23B is a configuration diagram of an antenna in which a magnetic member and a core are integrated in FIG. 23A .

24A is a configuration diagram of an antenna in which a magnetic sheet is formed into a flat plate in the second embodiment of the present invention, and FIG. 24B is a configuration diagram of an antenna in which a magnetic member and a core are integrated in FIG. 24A .

25A is a configuration diagram of an antenna in which a magnetic member is formed of three magnetic sheets in the present invention, and FIG. 25B is a configuration diagram of an antenna in which a magnetic member and a core are integrated in FIG. 25A.

26A is a configuration diagram of an antenna in which a magnetic member is composed of three magnetic sheets according to the present invention, and FIG. 26B is a configuration diagram of an antenna in which a magnetic member and a core are integrated in FIG. 26A.

27 is a configuration diagram of an antenna in which magnetic sheets are connected in a second embodiment of the present invention.

28 is a configuration diagram of an antenna in which a magnetic member is formed of an amorphous material in a second embodiment of the present invention.

29A to 29C are configuration diagrams showing an antenna having two magnetic members in the second embodiment of the present invention.

30A and 30B are cross-sectional views and plan views showing an antenna having two magnetic members in a second embodiment of the present invention.

31A to 31C are configuration diagrams showing an antenna in which the magnetic member and the core of the antenna having two magnetic members are integrated in the second embodiment of the present invention.

32A to 32C are configuration diagrams showing an antenna having two magnetic members in a third embodiment of the present invention.

Detailed ways

Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. For the sake of clarity, in each figure, the wire diameter of the coil is thickened and the number of winding turns is reduced, and the illustration of the wire connecting the coil and the receiving circuit is omitted. The case where the invention is applied to an antenna built in a watch-type radio-controlled watch for receiving standard radio waves has been described, but the application of the present invention is not limited thereto.

(first embodiment)

(antenna)

1A-1D are diagrams showing the antenna 100 of this embodiment, wherein FIG. 1A shows a front view of the antenna 100, FIG. 1B shows a right side view of FIG. 1A, FIG. 1C shows a cross-sectional view of the IC-IC direction of FIG. A cross-sectional view along the ID-ID direction of FIG. 1A is shown.

As shown in the figure, the antenna 100 is structurally composed of a rod-shaped core 100, a coil 120 in which a conductive wire such as copper is wound around the center of the core 110, and covering cores that respectively cover both ends of the coil 120. 131, 132 (hereinafter collectively referred to as "covering core 130").

The core 110 and the cladding core 130 are formed using a magnetic material having a high relative permeability and a large resistance such as ferrite or amorphous, and a magnetic material having a relative permeability of about 1,000 to 100,000, for example. In the case of using a magnetic material having a relative magnetic permeability of, for example, about 1,000 to 100,000, the reluctance inside the core 110 and the covering core 130 is lower than the reluctance of the surrounding space of the antenna 100 . 110 and the covering core 130 are small, about 1/1000 to 1/100000 of the surrounding space of the latter antenna 100 .

Each covering core 131, 132 has substantially the same substantially cylindrical shape, and gaps 130g, 130g are provided between the core 110 inside the ends facing each other. The openings 130h of the gaps 130g, 130g are , 130h opposite formation. In the case of this embodiment, as shown in FIG. 1C, a pair of cladding cores 131, 132 are respectively received in the ends of the coil 120 in the gaps 130g, 130g, and the received parts are respectively in the axial direction of the coil. About 1/3 of the length, each covering core 131 , 132 covers both ends of the coil 120 .

In addition, the covering core 130 is a part that does not cover the end of the coil 120 , and its inner peripheral surface is directly in contact with the outer peripheral surface of the core 110 , so it is integrated with the core 110 .

In other words, the covering cores 131 and 132 are laminated on the outer peripheral surfaces of both ends of the core 120 . In addition, the covering cores 131 and 132 may be formed by adhering and laminating a magnetic film on the both ends and the outer peripheral surface of the core 110 in the same way as covering the both ends of the coil 120 .

In addition, when looking at the overall shape of the antenna 100 except for the coil 120, a concave portion is formed in the central portion of the outer peripheral surface of the core 110, and a coating core is covered at both ends of the outer peripheral surface of the core 110. 131, 132, therefore, respectively form a convex portion. And the coil 120 is wound around the recessed part between the covering cores 131 and 132 used as each convex part.

According to the antenna 100 configured as described above, the core 110 and the covering core 131 , and the core 110 and the covering core 132 are magnetically coupled to each other. On the other hand, the one covering core 131 and the other covering core 132 are magnetically separated at the outer peripheral portion of the coil 120 by the gap 136 formed therebetween. Therefore, as shown in FIG. 1C , among the magnetic paths MR surrounding the coil 120, the reluctance of the path (external path) MR1 passing outside the coil 120 via the gap 136 is higher than that of the path passing through the gap 136 due to the presence of the gap 136. The path inside the coil 120 (internal path) MR2 is much larger.

When the antenna 100 having such a configuration is placed in a signal magnetic field such as a standard radio wave, the magnetic field acts on the antenna as follows.

FIG. 2 is a diagram showing the effect of the signal magnetic field on the antenna 100 , and shows a vertical cross-sectional view of the antenna 100 . Wherein, the signal magnetic field is set as a parallel magnetic field, and the antenna 100 is set in such a way that the axis of the coil 120 is parallel to the direction of the magnetic field.

As shown in FIG. 2 , when the antenna 100 is placed in the signal magnetic field, the signal magnetic flux M1 (shown by a solid line in the figure) concentrates on the core 110 and intersects with the coil 120 . Then, a generated magnetic flux M2 (indicated by a dashed-dotted line in the figure) is formed in the coil 120 to prevent the change of the signal magnetic flux M1 passing through the coil 120 .

Specifically, the signal magnetic flux M1 is distributed as follows.

First, in the space X1 including the one end 121 (incoming side of the signal magnetic flux) of the coil 120, the signal magnetic flux M1 goes around along the outer side of the one end 121 (in this figure, the left side). In the way of entering, the core 110 (inside the core 120 ) is inserted through the covering core 131 covering the one end 121 . And, in the space X2 including the other end 122 of the coil 120, the signal magnetic flux M1 entering the core 110 through the cladding core 131 travels from the core 110 to the outside of the other end 122 (in the In the drawing, it is shown on the right side) to be wound in, and discharged to the outer space of the antenna 100 through the covering core 132 covering the other end 122 .

In the case where there is no covering core 131, the signal magnetic flux M1 enters the core 110 through one end 121 of the coil 120 in the space X1 as shown by the two-dot chain line in the figure, and enters the core 110 in the space X2 from The core 110 is discharged into the outer space of the antenna 100 through the other end 122 of the coil 120 . However, in this embodiment, since the covering cores 131 and 132 are provided, the signal magnetic flux M1 enters the core 110 without passing through the one end 121 of the coil 120 in the space X1, and does not pass through the coil in the space X2. The other end 120 of the antenna 120 is discharged into the outer space of the antenna 100 . Therefore, the signal magnetic flux M1 passing through the coil 120 is much smaller than the case where the covering cores 131 and 132 are not provided.

In addition, in the space Y near the center of the coil 120, when comparing the reluctance of the external path MR3 passing through the gap 136 outside the coil 120 with the reluctance of the internal path MR4 passing through the coil 120, the external path The reluctance of MR3 is much larger than the reluctance of the internal path MR4 due to the presence of the gap 136. Therefore, the signal magnetic flux M1 enters through the covering core 131 without passing outside the coil 120. The core 110 passes through the path through the core 132 for covering from the core 110 .

In addition, at this time, the signal magnetic flux M1 does not pass through the respective end portions 121 and 122 of the coil 120 as described above, but passes through the cladding core 130 so as to wrap around along the respective end portions 121 and 122 .

On the other hand, the generated magnetic flux M2 is distributed as follows.

In the outer portion of the coil 120 in FIG. 2 , a magnetic flux M2 is generated, and passes through a path such as the covering core 130 having a magnetic resistance smaller than that of the surrounding space of the antenna 100 . When passing through the covering core 130 , the generated magnetic flux M2 passes through the covering core 130 so as to wind around the outer sides of the respective end portions 121 and 122 of the coil 120 , similarly to the above-mentioned signal magnetic flux M1 . Therefore, in the outer peripheral portion of each end portion 121, 122 of the coil 120, the magnetic flux M2 is generated to concentrate on the covering core 130 and the magnetic flux density becomes the largest (the magnetic field becomes stronger) there, but from the coil 120 to the outer circumference thereof, The farther the direction is, the smaller the magnetic flux density becomes (the magnetic flux becomes weaker).

FIG. 3 shows another embodiment in which a magnetic body is disposed in order to suppress eddy current loss of a metal 400 disposed parallel to the axis of the antenna 100 .

As in this example, when the magnetic body 420 is arranged in order to suppress the eddy current loss of the metal 400 as shown in FIG. The eddy current loss of the metal 400 is effectively suppressed, and the loss is reduced.

(watches with built-in antenna)

Next, an example in which the antenna 100 of the present embodiment is incorporated in a wrist-type radio-controlled timepiece will be described.

FIG. 4 is a plan view of a wristwatch 1 incorporating the antenna 100 of the present invention, and FIG. 5 is a cross-sectional view of the wristwatch 1 in FIG. 4 along the line V-V.

As shown in FIGS. 4 and 5 , the wristwatch 1 has a resin case 2 that accommodates a watch module 4 of the wristwatch circuit therein. The watch case 2 is equipped with a band member 8 for attaching the watch 1 to the user's wrist.

A watch glass 2 a is inlaid in the center of the upper surface of the watch case 2 for a dial 5 to be seen through a gasket 2 b. In addition, a switch 3 for instructing execution of various functions of the wristwatch 1 is provided around the watch case 2 . In addition, a bezel 2f is provided on the outer periphery of the upper portion of the case 2, and a bottom cover 2c formed of metal is attached to the bottom surface of the case 2 via a waterproof ring 2d.

The watch module 4 has: an upper housing part 4a, a lower housing part 4b, an analog pointer mechanism 7 for moving hands such as an hour hand or a second hand on the dial 5, an antenna 100 for receiving standard radio waves, and the above-mentioned Analog pointer mechanism 7 or circuit board 6 to which the antenna is connected and controls them.

In addition, the upper case portion 4 a , the lower case portion 4 b , and the dial 5 have respective peripheral edge portions attached to the middle frame 2 g provided on the inner peripheral surface of the watch case 2 .

The lower case portion 4b is supported above the cushioning member 2e provided on the upper portion of the bottom cover 2c. The circuit board 6 is arranged between the lower case part 4b and the upper case part 4a. In addition, a dial 5 is disposed on the upper surface of the upper case portion 4a. A frame-shaped member 5b is arranged on the upper peripheral edge of the dial 5 in contact with the lower peripheral edge of the watch glass 2a.

The analog pointer mechanism 7 has a pointer shaft 7a extending upward from the shaft hole 5b formed on the dial 5, and pointers 7b such as hour and minute hands mounted on the pointer shaft 7a, so that the pointer 7b moves above the dial 5. . A battery for operating the analog pointer mechanism 7 is incorporated in the lower case portion 4b.

Between the lower case part 4b and the dial 5, the antenna 100 is arranged in a state where the axis of the coil 120 is supported by the upper case part 4a parallel to the bottom cover 2c (or the dial 5). Furthermore, a receiving circuit that detects the induced electromotive force generated by the coil 120 of the antenna 100 and receives radio waves sent from the outside is mounted on the circuit board 6 .

FIG. 6 is a block diagram showing the internal configuration of the wristwatch 1 .

As shown in FIG. 6 , wristwatch 1 has CPU 10 , input unit 20 , display unit 30 , ROM 40 , RAM 50 , reception control unit 60 , time code conversion unit 70 , timer circuit unit 80 , and oscillation circuit unit 82 . In addition, each part except the oscillator circuit part 82 is connected by the bus B, and the oscillator circuit part 82 is connected to the timer circuit part 80 .

The CPU 10 reads out the program stored in the ROM 40 in response to a predetermined timing or an operation signal input from the input unit 20 and expands it in the RAM 50. According to the program, instructions to the various parts constituting the wristwatch 1 or transfer of data are performed. Specifically, for example, the reception control unit 60 is controlled to perform standard radio wave reception processing at predetermined intervals, and the current time data counted by the timer circuit unit 80 is corrected based on the standard time code input from the time code conversion unit 70 .

The input unit 20 is a switch 3 or the like for instructing execution of various functions of the wristwatch 1 , and when these switches 3 are operated, corresponding operation signals are output to the CPU 10 .

The display unit 30 includes a dial 5 and an analog pointer mechanism 7 controlled by the CPU for displaying the current time counted by the timing circuit unit 80 .

The ROM 40 stores a system program of the wristwatch 1, an application program, a program for realizing the present embodiment, various data, and the like.

The RAM 50 is used as a working area of the CPU 10 , and stores programs read from the ROM 40 , data processed by the CPU 10 , and the like.

The reception control unit 60 has a radio wave receiving device 62 . The radio wave receiving device 62 cuts unnecessary frequency components of the standard radio wave received by the antenna 100 and extracts a corresponding frequency signal, converts the frequency signal into a corresponding electrical signal, and outputs the converted signal to the time code conversion unit 70 .

The time code conversion unit 70 converts the electric signal input from the radio wave receiving device 62 into a digital signal, regenerates a standard time code including data necessary for watch functions such as a standard time code, cumulative code, and day of the week code, and outputs it to the CPU 10 .

The timer circuit unit 80 counts the signal input from the oscillation circuit unit 82 to measure the current time, and outputs the measured current time data to the CPU 10 . The oscillation circuit unit 82 is a circuit that always outputs a clock signal of a constant frequency.

(Effect of the first embodiment)

As described above, according to the antenna 100 of this embodiment, the following effects can be obtained.

(1) In the spaces X1 and X2 including the ends 121 and 122 of the coil 120 , the signal magnetic flux M1 passes through the covering core 130 , and the signal magnetic flux M1 crossing the ends 121 and 122 of the coil 120 is extremely small. Therefore, the loss caused by the signal magnetic flux M1 passing through (crossing) the ends 121 , 122 of the coil 120 is reduced.

(2) In the space Y near the center of the coil 120, the signal magnetic flux M1 passes through the inside of the coil 120 via the core 110 and the covering core 130, and the signal passes outside the coil 120 (that is, does not link with the coil 120). The magnetic flux M1 is extremely small. Therefore, the loss caused by the signal magnetic flux M1 passing outside the coil 120 is reduced.

(3) Since the spread of the generated magnetic flux M2 becomes smaller, the generated loss (eddy current loss) is reduced.

(4) Because the width of the magnetic flux M2 becomes smaller and the directivity is sharper, the coupling range between the magnetic flux M2 and the metal 400 near the coil 120 becomes narrower, and the loss (eddy current loss) generated by the magnetic flux M2 passing through the metal 400 is generated. )reduce.

(5) In addition, in this case, since the coupling range between the magnetic flux M2 and the metal 400 is narrowed, the magnetic body 420 arranged to avoid the magnetic coupling between the coil 120 and the metal 400 can be reduced, and the signal magnetic flux M1 Losses caused by the magnetic body 420 are reduced.

(6) On the magnetic path surrounding the coil 120, since the covering core 130 with high relative magnetic permeability is provided, the proportion of the portion with high magnetic permeability is increased, and the effective magnetic permeability of the entire magnetic path is μe becomes larger. In addition, since the inductance L of the coil 120 is proportional to the square of the magnetic permeability μ and the number of winding turns N, when the effective magnetic permeability μe becomes larger, the winding turns required to obtain a certain inductance L The number N can be reduced, and as a result, the loss due to the impedance of the coil 120 is reduced. In this case, the effective magnetic permeability μe is determined by the size of the gap 136 and the inductance L of the coil 120 is determined. Therefore, an ideal inductance L can be obtained by appropriately setting the gap 136 .

(Modification)

In addition, the application of this invention is not limited to the above-mentioned embodiment, It can change suitably in the range which does not deviate from the concept of this invention. For example, the antenna 100 may be configured as follows.

(A) When it is formed as an amorphous

In the above-mentioned embodiment, the core 110 and the cladding core 130 are formed of ferrite, and ferrite has the advantage of being easy to process. However, other magnetic materials, such as amorphous materials with high impact strength, can also be used.

7A to 7E are diagrams showing the antenna 100a formed of amorphous. Fig. 7A shows the front view of antenna 100a, Fig. 7B shows the sectional view of VIIB-VIIB direction of Fig. 7A, Fig. 7C shows the right side view of Fig. 7B, Fig. 7D shows the horizontal sectional view of Fig. 7A, Fig. 7E shows the VIIE-VIIE direction of Fig. 7A cutaway view.

According to the figure, the antenna 100a is formed by winding a coil 120 around the central portion of an amorphous core 110a. The core 110a is formed by laminating thin plate-shaped amorphous materials, and a concave portion where the coil 120 is wound is formed in the central portion. In addition, among the plurality of thin-plate amorphous crystals forming the core 110a, both ends of the upper and lower thin plates are bent outward toward the center of the coil 120 so as to cover both ends of the coil 120, thereby forming an L-shaped coating in cross section. Cores 131a, 132a are used.

(B) Formation of composite ferrite and amorphous

In addition, it is also possible to form composite ferrite and amorphous.

8A and 8B are diagrams showing an antenna 100b formed by combining amorphous and ferrite. FIG. 8A is a front view of the antenna 100b, and FIG. 8B is a cross-sectional view taken along line VIII-VIIIB of FIG. 8A. According to the figure, in the antenna 100b, a coil 120 is wound around a core 110b formed of laminated thin-plate amorphous crystals, and a ferrite coil is provided on the outer peripheral portion of the core 110b so as to cover both ends 121 and 122 of the coil 120. Covering cores 131b, 132b.

(C) When a notch is provided in the coating core

The covering core 130 is magnetized by the signal magnetic flux M1 and the generated magnetic flux M2 to cause a return current to flow, and the magnetic coupling between the core 110 and the covering core 130 causes a loss. Therefore, in order to suppress the return current generated in the cladding core 130 , a notch along the axial direction of the core 110 may be provided in the cladding core 130 .

9A to 9D are diagrams showing the antenna 100c in which a notch is provided in the cladding core 130 . 9A shows a front view of the antenna 100c, FIG. 9B shows a right side view of FIG. 9A, FIG. 9C shows a horizontal cross-sectional view of FIG. 9A, and FIG. 9D shows a cross-sectional view in the LCD-LCD direction of FIG. 9A.

According to the figure, the notch part (slot) 134c parallel to the axial direction of the core 110 is provided in the covering core 130c. That is, the covering core 130 is formed in a substantially U-shaped cross section. Moreover, the notch part 134c is provided in the whole length direction of the covering core 130c.

(D) The case where the end of the covering core is formed obliquely

In addition, the facing surfaces 130d in which the covering cores 130 face each other may be formed obliquely with respect to the direction perpendicular to the axis of the core 110 .

10A and 10B are diagrams showing the antenna 100d in which the facing surfaces 130d of the cladding cores 130 facing each other are obliquely formed. FIG. 10A shows a front view of the antenna 100d, and FIG. 10B shows a vertical cross-sectional view of FIG. 10A. 10A, 10B, the facing surface of the covering core 130d is narrowed above the coil 120 and widened below the coil 120 at the distance between the facing surfaces 136d of the covering cores 131d and 132d. The pattern is formed at a predetermined angle with respect to the axial direction of the core 110 . Furthermore, when this antenna 100d is built into the wristwatch 1, as shown in the sectional view of main parts of the wristwatch 1 in FIG. It is disposed above (that is, facing the watch glass 2a).

(E) When filling the space between the coating cores

In addition, it is also possible to use a non-magnetic material or a material with a relative magnetic permeability much smaller than the magnetic material forming the core 110 or the core 130 for cladding in the gap 136 formed between the cores 131 and 132 for cladding. to cover the central portion of the coil 120 .

11A and 11B are diagrams showing the antenna 100e in which the space 136 is filled with a non-magnetic material. FIG. 11A is a front view of the antenna 100e, and FIG. 11B is a vertical cross-sectional view of FIG. 11A. As shown in FIGS. 11A and 11B , in the antenna 100 e , the gap 136 between the covering cores 131 and 132 is filled with a non-magnetic material 138 e. Even in this case, since the reluctance of the space 136 is much larger than the reluctance of the core 110 and the core 130 for cladding, a magnetic flux M2 is generated near the outer center of the coil 120 and passes through the non-magnetic body 180e. Inside the coil 120 . Moreover, the central part (part not covered by the covering core 130) of the coil 120 can be protected by the magnetic body 180e. In addition, as a non-magnetic material filled (covered) in the space 136, resin, glass, etc. are mentioned, for example.

(F) When the covering core does not cover the end of the coil

In addition, the covering core 130 may not cover the ends 121 and 122 of the coil 120 .

12A and 12B are diagrams showing the antenna 100f in which the covering core 130f does not cover the ends 121 and 122 of the coil 120 . FIG. 12A is a front view of the antenna 100f, and FIG. 12B is a vertical cross-sectional view of FIG. 12A. 12A and 12B, the antenna 100f has covering cores 131f, 132f protruding in the outer peripheral direction as protrusions on the outer peripheral surface of the core 110, and the coil 120 is wound between the covering cores 131f, 132f. Even in this case, near both ends of the coil 120 , the signal magnetic flux M1 and the generated magnetic flux M2 pass through the covering cores 131 f , 132 f whose magnetic permeability is lower than that near both ends 121 , 122 of the coil 1120 .

As can be seen from the above description: the antenna of this embodiment (for example, the antenna 100 in FIGS. 1A to 1D ) is characterized in that the magnetic layer (for example, the covering core 130 in FIGS. The outer peripheral portion of the core outside the winding covers both ends of the winding (for example, the coil 120 in FIGS. 1A to 1D ) wound around the core.

According to the antenna having such a configuration, both ends of the winding wire wound around the core can be covered with the magnetic layer together with the outer peripheral portion of the core outside the winding wire. In the antenna, the core is magnetized by the magnetic field component of the received radio wave, and a magnetic flux (generated magnetic flux) that blocks the time change of the magnetic flux passing through the core is generated (generated magnetic flux), but at this time, at both ends of the coil, the received radio wave The magnetic flux (signal magnetic flux) and generated magnetic flux of the magnetic field component pass through the magnetic material layers covering the end portions, respectively. That is, since the magnetic flux crossing the coil end is extremely small, the loss caused by the magnetic flux crossing the coil is reduced, and the reception sensitivity of radio waves is improved. In addition, on the outside of the coil, among the signal magnetic fluxes, the magnetic flux passing outside the coil (that is, not intersecting the coil link) passes through the magnetic layer and intersects the coil link. Therefore, the magnetic flux inside the coil increases (that is, the magnetic field becomes stronger), and the reception sensitivity improves.

In addition, in the antenna of this embodiment (for example, the antenna 100 shown in FIGS. 1A to 1D ), a wire (for example, shown in FIG. 1A-FIG. 1D, the coil 120) antenna is characterized in that it has two covering parts (for example, FIGS. 1A-FIG. 1A-FIG. 1D covering core 130), on the opposing surface sides of the two covering parts, annular gaps are respectively formed between the inner peripheries of the two covering parts and the outer periphery of the above-mentioned core, and the above-mentioned surrounding Both ends of the wire are inserted into the above-mentioned annular gap.

According to the antenna having such a structure, in the antenna in which the wire is wound around the outer periphery of the central part of the rod-shaped core, it is possible to realize a magnetic material having outer peripheries covering both ends of the core. The two cladding parts are formed on the facing sides of the two cladding parts, and respectively form annular gaps between the inner circumference of the two cladding parts and the outer circumference of the above-mentioned core, and the two sides of the above-mentioned winding wire The end portion is inserted into the antenna arranged in the above-mentioned annular gap. In the antenna, the core is magnetized by the magnetic field component of the received radio wave, and a magnetic flux (generated magnetic flux) that blocks the time change of the magnetic flux passing through the core is generated (generated magnetic flux), but at this time, at both ends of the coil, the received radio wave The magnetic flux (signal magnetic flux) and the generated magnetic flux of the magnetic field component pass through the coating portions that respectively cover the end portions. That is, since the magnetic flux crossing the coil end is extremely small, the loss caused by the magnetic flux crossing the coil is reduced, and the reception sensitivity of radio waves is improved. In addition, on the outside of the coil, among the signal magnetic fluxes, the magnetic flux passing outside the coil (that is, not intersecting the coil link) passes through the covering portion and intersects the coil link. Therefore, the magnetic flux inside the coil increases (that is, the magnetic field becomes stronger), and the reception sensitivity improves.

In this case, like the antenna of this embodiment shown in FIGS. 9A to 9D , it is also possible to form a notch (for example, the notch in FIGS. 9A to 9D ) along the axial direction of the core in the covering portion. Part 134c) such a structure.

According to the antenna having such a configuration, it is possible to realize an antenna having the same effect as the antenna of FIGS. 1A to 1D and having a notch in the clad portion along the axial direction of the core. Therefore, the notch portion is magnetically coupled with the winding, and the backflow current generated in the covering portion is suppressed, thereby preventing loss due to the backflow current.

In addition, like the antenna of this embodiment, the facing surface of the cladding portion may be formed obliquely with respect to the axial direction of the core.

According to the antenna having such a configuration, it is possible to realize an antenna in which the facing surface of the clad portion is inclined with respect to the axial direction of the core while achieving the same effects as those of the antenna in FIGS. 1A to 1D .

The antenna of this embodiment (for example, the antenna 100a in FIGS. 7A to 7E ) is an antenna in which a wire (for example, the coil 120 in FIGS. 7A to 7E ) is wound on a core (for example, the core 110a in FIGS. 7A to 7E ). , is characterized in that: the above-mentioned core has two hooks (for example, the covering core 130a in FIG. Wrapped between the above 2 hooks.

According to the antenna having such a configuration, in an antenna in which a winding wire is wound on a core, it is possible to realize a winding between two hooks formed of the same or predetermined magnetic material as the core and whose front ends face each other ( That is, an antenna in which both ends of the winding wire are covered with hook portions). In the antenna, the core is magnetized by the magnetic field component of the received radio wave, and a magnetic flux (generated magnetic flux) that blocks the time change of the magnetic flux passing through the core is generated (generated magnetic flux), but at this time, at both ends of the coil, the received radio wave The magnetic flux (signal magnetic flux) and the generated magnetic flux of the magnetic field component pass through the hooks respectively covering the ends. That is, since the magnetic flux crossing the coil end is extremely small, the loss caused by the magnetic flux crossing the coil is reduced, and the reception sensitivity of radio waves is improved. In addition, on the outside of the coil, among the signal magnetic fluxes, the magnetic flux passing outside the coil (that is, not intersecting with the coil) passes through the hook portion and intersects with the coil. Therefore, the magnetic flux inside the coil increases (that is, the magnetic field becomes stronger), and the reception sensitivity improves.

The antenna of this embodiment (for example, the antenna 100f of FIGS. 12A and 12B ), in the antenna in which a core (for example, the core 110 of FIGS. 12A and 12B ) is wound with a wire (for example, the coil 110f of FIGS. 12A and 12B ) , is characterized in that: the above-mentioned core has two protrusions formed of the same or prescribed magnetic material as the core on the outer peripheral surface (for example, the covering core 130f in Fig. 12A and Fig. 12B ), and the above-mentioned winding wire is wound Between the above two protrusions.

According to the antenna having the above configuration, in the antenna in which the winding wire is wound on the core, it is possible to realize a method in which the winding wire is wound between two protrusions formed of a magnetic material (that is, the protrusions are provided near both ends of the winding wire). ) antenna. In the antenna, the core is magnetized by the magnetic field component of the received radio wave, and a magnetic flux (generated magnetic flux) that blocks the time change of the magnetic flux passing through the core is generated (generated magnetic flux), but at this time, at both ends of the coil, the received radio wave The magnetic flux (signal magnetic flux) and generated magnetic flux of the magnetic field component pass through the protrusion near the end. That is, since the magnetic flux crossing the coil end is extremely small, the loss caused by the magnetic flux crossing the coil is reduced, and the reception sensitivity of radio waves is improved. In addition, on the outside of the coil, among the signal magnetic fluxes, the magnetic flux that passes outside the coil (that is, does not intersect with the coil) passes through the convex portion and intersects with the coil. Therefore, the magnetic flux inside the coil increases (that is, the magnetic field becomes stronger), and the reception sensitivity improves.

In addition, like the antenna of this embodiment, a structure in which the central portion of the winding wire is covered with a non-magnetic material (for example, the non-magnetic body 138e in FIGS. 11A and 11B ) may also be used.

According to the antenna having such a configuration, it is possible to realize an antenna in which the central portion of the winding wire is covered with a non-magnetic material.

The watch device of this embodiment (for example, the wristwatch 1 in FIG. 6 ) is characterized in that it has: the antenna shown in FIG. 1 , and a time code generation mechanism (for example, FIG. The time code conversion part 70), the timing mechanism (for example, the timing circuit part 80 of FIG. 6 ) that counts the current time, based on the standard time code generated by the above-mentioned time code generation mechanism, corrects the current time counted by the above-mentioned timing mechanism Data correction mechanism (for example, CPU10 in FIG. 6).

According to the watch device having such a configuration, the standard time code can be generated based on the received radio wave, and the current time data can be corrected based on the generated standard time code.

As a result, according to the present embodiment, it is possible to reduce the loss occurring in the antenna (especially the rod antenna) and improve the reception efficiency of radio waves.

(second embodiment)

13A to 13D are diagrams showing the antenna 201 according to the second embodiment. FIG. 13A shows a plan view of the antenna 201 , FIG. 13B shows a front view, FIG. 13C shows a right side view of FIG. 13B , and FIG. 13D shows a bottom view. As shown in the figure, the antenna 201 has a cylindrical rod-shaped core 220 , a coil 230 formed by winding a wire such as copper around the center of the core 220 , and a plate-shaped magnetic member 241 .

The core 220 and the magnetic member 241 are formed of, for example, a magnetic material such as ferrite with high relative permeability and high electrical resistance. Specifically, the core 220 and the magnetic member 241 are formed using a magnetic material having a relative permeability of approximately 1,000 to 100,000. Therefore, the magnetic resistance inside the core 220 and the magnetic member 241 is extremely small, about 1/1000 to 1/100000 of the magnetic resistance of the space (in air) around the antenna 201 .

The length in the longitudinal direction of the magnetic member 241 is longer than the length L in the axial direction of the coil 230 , and the width (length in the short direction) is slightly longer than the diameter of the coil 230 . Furthermore, the magnetic member 241 faces the outer peripheral surface of the coil 230 , and its longitudinal direction is arranged in parallel to the axial direction of the core 220 . In addition, here, although the width of the magnetic body 241 is formed slightly longer than the diameter of the coil 230, it can be made shorter of course.

Specifically, the magnetic member 241 is composed of a set of two magnetic pieces 241a and 241b formed by separating plate-shaped objects bent in the same direction at substantially the same angle at the central portion facing the core 220 . That is, the magnetic pieces 241a and 241b have substantially the same shape with substantially the same size. Furthermore, the distance between the magnetic sheets 241a, 241b, that is, the distance D1 between the end portions 241ac, 241bc on the central side facing the core 230 is smaller than the portion of the core 220 where the coil 230 is not wound and the magnetic sheets 241a, 241b. The distance D2 between the ends 241ae and 241be on the other side of each of the 241b is long.

In addition, the distance between the core 220 and the magnetic pieces 241a, 241b is the longest at the ends 241ac, 241bc of the core 220 on the side facing the central portion of the coil 230, and becomes shorter toward the other end 241ae, 241be. The magnetic body pieces 241a, 241b are formed by bending. That is, among the distances between the core 220 and the magnetic pieces 241a, 241b, the distance D3 between the central end portions 241ac, 241bc is the longest, and the distance D2 between the other end portions 241ae, 241be is the shortest. .

(distribution of magnetic flux)

Furthermore, when the antenna 201 is placed in the signal magnetic field of a standard radio wave, the magnetic field acts on the antenna 201 as follows.

FIG. 14 is a diagram showing the effect of the signal magnetic field on the antenna 201 , and shows a vertical cross-sectional view of the antenna 201 . Here, the signal magnetic field is a parallel magnetic field, and the antenna 201 is arranged such that the axial direction of the coil 230 is parallel to the magnetic field direction.

According to this figure, when the antenna 201 is placed in the signal magnetic field, the signal magnetic flux M1 (in this figure, represented by a solid line) is concentrated at the core 220 and intersects with the coil 230, in which it blocks the passage of The changing direction of the signal magnetic flux M1 inside the coil 230 forms a magnetic flux M2 (indicated by a dotted line in the figure).

Specifically, the signal magnetic flux M1 is distributed as follows.

Since the magnetic resistance of the magnetic member 241 is extremely small compared with the magnetic resistance in air, it is considered that the signal magnetic flux M1 passes through the magnetic member 241 as much as possible. However, the distance D1 between the central end 241ac of the magnetic sheet 241a and the central end 241bc of the magnetic sheet 241b is greater than the portion of the core 220 where the coil 230 is not wound and the end 241ae of the magnetic sheet 241a. The distance D2 between each end part 241be of the magnetic body piece 241b is long. Therefore, the signal magnetic flux M1 enters the core 220 from the end 241ac side across the magnetic piece 241a without passing between the magnetic pieces 241a and 241b, and then passes through the core 220 and crosses the magnetic piece from the end 241be side. 241b path. Here, the signal magnetic flux M1 entering the magnetic piece 241a from the end 241ae side leaves the magnetic member 241a on one side of the magnetic member 241a and enters the core 220, which changes according to the propagation of the received radio wave or the AC level.

Therefore, in the space X1 where the magnetic sheet 241a is arranged opposite to the core 220, the signal magnetic flux M1 of the magnetic sheet 241a crosses the magnetic sheet 241a and enters the core 220, passes through the core 220, and then passes through the core 220. The space X2 in which the magnetic sheet 241b is disposed facing each other crosses the path of the magnetic sheet 241b.

On the other hand, the generated magnetic flux M2 is distributed as follows.

In the space Y where the magnetic body 241 is arranged opposite to the core 220, the generated magnetic flux M2 has a higher relative permeability than the surrounding space, and passes through the magnetic body pieces 241a, 241b arranged along the direction of the generated magnetic flux M2 as long as possible. path of. Therefore, the generated magnetic flux M2 passing through the magnetic member 241 becomes less in contrast to the longitudinal direction of the magnetic member 241 . As a result, in this figure, compared with the upper portion of the coil 230 where the magnetic member 241 is not disposed, the vertical spread of the generated magnetic flux M2 becomes smaller.

(watch with antenna)

Next, a wristwatch-type radio-controlled timepiece (hereinafter, simply referred to as a "wristwatch") having the antenna 201 will be described.

FIG. 15 is a plan view of the wristwatch 1 having the antenna 201 , and FIG. 16 is a cross-sectional view of the wristwatch 1 taken along the XVI-XVI direction of FIG. 15 . As shown in FIGS. 15 and 16 , the wristwatch 1 has a case 2 formed of resin or metal in which a watch module 4 is housed, and a band member 8 for attaching the watch to the user's wrist is attached to the case 2 .

A watch glass 2 a is set in the upper center of the watch case 2 for a dial 5 via a gasket 2 b. In addition, a switch 3 for instructing execution of various functions of the wristwatch 1 is provided around the watch case 2 . In addition, a bezel 2f is provided on the outer periphery of the upper portion of the case 2, and a bottom cover 2c formed of metal is attached to the bottom surface of the case 2 via a waterproof ring 2d.

The watch module 4 has: an upper housing part 4a, a lower housing part 4b, an analog pointer mechanism 7 for moving hands such as an hour hand or a second hand on the dial 5, an antenna 201 for receiving standard radio waves, and the above-mentioned Analog pointer mechanism 7 or circuit board 6 to which the antenna is connected and controls them. In addition, the upper case portion 4 a , the lower case portion 4 b , and the dial 5 have respective peripheral edge portions attached to the middle frame 2 g provided on the inner peripheral surface of the watch case 2 .

The lower case portion 4b is supported above the cushioning member 2e provided on the upper portion of the bottom cover 2c. The circuit board 6 is arranged between the lower case part 4b and the upper case part 4a. In addition, a dial 5 is disposed on the upper surface of the upper case portion 4a. A frame-shaped member 5b is arranged on the upper peripheral edge of the dial 5 in contact with the lower peripheral edge of the watch glass 2a.

The analog pointer mechanism 7 has a pointer shaft 7a extending upward from the shaft hole 5b formed on the dial 5, and pointers 7b such as hour and minute hands mounted on the pointer shaft 7a, so that the pointer 7b moves above the dial 5. . A battery for operating the analog pointer mechanism 7 is incorporated in the lower case portion 4b.

The antenna 201 is disposed between the lower case portion 4b and the dial 5. Specifically, the core 220 is arranged so that its axial direction is parallel to the bottom cover 2c (or the dial 5), and the magnetic member 241 (magnetic sheet 241a, 241b) are respectively supported by the upper case portion 4a below the core 220 (on the side of the bottom cover 2c) so as to be parallel to the bottom cover 2c. Furthermore, a receiving circuit (refer to the radio wave receiving device 62 in FIG. 17 ) for detecting the induced electromotive force generated by the coil 230 of the antenna 201 is mounted on the circuit board 6 .

In this way, the antenna 201 is arranged such that the magnetic member 241 is located between the core 220 and the bottom cover 2c. Therefore, on the side of the bottom cover 2c, the generated magnetic flux M2 passes through the magnetic member 241, and the generated magnetic flux passing through the bottom cover 2c is extremely small. Therefore, eddy current loss generated in the bottom cover 2c can be suppressed.

(Internal composition of the watch)

FIG. 17 is a block diagram showing the internal configuration of the wristwatch 1 . As shown in FIG. 17 , wristwatch 1 has CPU 10 , input unit 20 , display unit 30 , ROM 40 , RAM 50 , reception control unit 60 , time code conversion unit 70 , timer circuit unit 80 , and oscillation circuit unit 82 . In addition, each part except the oscillator circuit part 82 is connected by the bus B, and the oscillator circuit part 82 is connected to the timer circuit part 80 .

The CPU 10 reads out the program stored in the ROM 40 in response to a predetermined timing or an operation signal input from the input unit 20 and expands it in the RAM 50. According to the program, instructions to the various parts constituting the wristwatch 1 or transfer of data are performed. Specifically, for example, the reception control unit 60 is controlled to perform standard radio wave reception processing at predetermined intervals, and the current time data counted by the timer circuit unit 80 is corrected based on the standard time code input from the time code conversion unit 70 .

The input unit 20 is a switch 3 or the like for instructing execution of various functions of the wristwatch 1 , and when these switches 3 are operated, corresponding operation signals are output to the CPU 10 .

The display unit 30 includes a dial 5 and an analog pointer mechanism 7 controlled by the CPU for displaying the current time counted by the timing circuit unit 80 .

The ROM 40 stores system programs, application programs of the wristwatch 1, programs and data for realizing the present embodiment, and the like.

The RAM 50 is used as a working area of the CPU 10 and temporarily stores programs read from the ROM 40 , data processed by the CPU 10 , and the like.

The reception control unit 60 has a radio wave reception device 62 . The radio wave receiving device 62 has an antenna 201, which cuts unnecessary frequency components in the standard radio waves received by the antenna 201 and takes out a corresponding frequency signal, converts the frequency signal into a corresponding electrical signal, and then outputs the converted signal to the time code conversion unit 70 .

The time code conversion unit 70 converts the electric signal input from the radio wave receiving device 62 into a digital signal, regenerates a standard time code including data necessary for watch functions such as a standard time code, cumulative code, and day of the week code, and outputs it to the CPU 10 .

The timer circuit unit 80 counts the signal input from the oscillation circuit unit 82 to measure the current time, and outputs the measured current time data to the CPU 10 . The oscillation circuit unit 82 is a circuit that always outputs a clock signal of a constant frequency.

(Effect)

As described above, according to the second embodiment, the following effects can be obtained.

(1) In the antenna 201, since the magnetic resistance between the two magnetic pieces 241a and 241b constituting the magnetic member 241 is extremely high, the signal magnetic flux M1 by the magnetic piece 241a enters the core 220 and passes through the core 230. Inside of , the signal magnetic flux M1 that does not pass through the core 220 is extremely small. That is, the signal magnetic flux M1 passing through the inside of the core 230 increases, thereby improving the reception efficiency of the antenna 201 .

(2) In addition, by setting the magnetic body pieces 241a, 241b into a curved shape, the distance between each of the magnetic body pieces 241a, 241b and the coil 230 is greater than that of the magnetic body piece 241a on the side of the central part of the core 220 around which the coil 230 is wound. The ends 241ac, 241bc of , 241b are the longest, and the ends 241ae, 241be become shorter toward the other side. Therefore, more signal magnetic flux M1 enters the core 220 and passes through the inside of the core 230, and the receiving efficiency of the antenna 201 is further improved.

(3) Furthermore, as shown in Fig. 15 and Fig. 16, inside the wristwatch 1, the antenna 201 is arranged in such a way that the magnetic member 241 is located on the side of the bottom cover 2c and the core 220 is located on the side of the dial 5, and a suppression can be realized. A watch that improves reception sensitivity by reducing the eddy current generated on the metal bottom cover 2c.

(third embodiment)

Next, a third embodiment will be described. In addition, in the third embodiment, the same reference numerals are used for the same elements as those in the above-mentioned second embodiment, and detailed descriptions thereof are omitted.

(Structure of Antenna)

18A to 18D are diagrams showing the antenna 202 according to the third embodiment. FIG. 18A shows a top view of the antenna 202, FIG. 18B shows a front view of the antenna 202, FIG. 18C shows a right side view of FIG. 18B, and FIG. 18D shows a bottom view. As shown in the figure, the antenna 202 is configured to include a core 220 around which a coil 230 is wound at the center, a magnetic member 242 , and a fixing member 262 .

The magnetic member 242 is formed using a magnetic material such as ferrite, and has a flat plate shape whose length in the longitudinal direction is longer than the length L of the coil 230 and whose width is slightly longer than the diameter of the core 220 . Furthermore, the magnetic member 242 is fixed to the core 220 by the fixing member 262 so that it faces the outer peripheral surface of the coil 230 and is arranged in parallel with the axial direction of the core 220 .

The fixing member 262 is formed of an insulating material such as resin. Furthermore, the fixing member 262 integrally fixes the magnetic member 242 and the core 220 at both ends thereof so as to ensure the arrangement relationship described above.

Furthermore, the antenna 202 integrally fixed by the fixing member 262 is arranged in the wristwatch as follows. That is, similarly to the above-mentioned second embodiment, the magnetic member 242 is disposed parallel to the bottom cover 2c below the core 220 (on the bottom cover 2c side) between the lower case portion 4b and the dial 5 . However, since the core 220 and the magnetic member 242 are integrally fixed, it is not necessary to separately arrange the core 220 and the magnetic member 242 .

(Effect)

As described above, according to the third embodiment, the antenna 202 is fixed integrally with the magnetic member 242 and the core 220 , so that the arrangement work inside the wristwatch is easy, and the distance between the magnetic member 242 and the core 220 is constant. Therefore, since the inductance is kept constant, it is possible to prevent a difference in inductance between products due to manufacturing errors and a tuning shift based on the difference compared to a conventional method in which the core 220 and the magnetic member 242 are independently arranged. As a result, it is possible to easily mass-produce and manufacture a uniform radio-controlled watch based on design values. In addition, by arranging the antenna 202 such that the magnetic member 242 is positioned on the bottom cover 2c side and the core 220 is positioned on the dial 5 side, eddy current loss generated in the metal forming the bottom cover 2c can be minimized.

(fourth embodiment)

Next, a fourth embodiment will be described. In addition, in the fourth embodiment, the same reference numerals are used for the same elements as those in the above-mentioned second and third embodiments, and detailed descriptions thereof are omitted.

FIG. 19A is a diagram showing an antenna 203 according to the fourth embodiment. As shown in FIG. 19A , the antenna 203 has a core 220 in which a coil 230 is wound at the center and a magnetic member 243 in terms of configuration.

The magnetic member 243 is formed using a magnetic material such as ferrite, and has a flat plate shape whose length in the longitudinal direction is shorter than the length L of the winding coil 230 and whose length in the width direction is slightly longer than the diameter of the core 220 . Furthermore, the magnetic member 243 faces the outer peripheral surface of the coil 230 and is arranged in parallel with the axial direction of the core 220 in its longitudinal direction.

(distribution of magnetic flux)

Furthermore, when the antenna 203 is placed in the signal magnetic field of a standard radio wave, the magnetic field acts on the antenna 203 as follows.

FIG. 20 is a diagram showing the effect of the signal magnetic field on the antenna 203 , and shows a vertical cross-sectional view of the antenna 203 . Wherein, the signal magnetic field is a parallel magnetic field, and the antenna 203 is arranged such that the axis of the coil 230 is parallel to the direction of the magnetic field.

According to this figure, the generated magnetic flux M2 is distributed as follows.

In the space Z where the magnetic member 243 is arranged to face the core 220 , a magnetic flux M2 is generated and concentrated toward the magnetic member 243 having a higher relative magnetic permeability than the surrounding space. Therefore, the density of the generated magnetic flux M2 becomes higher in the portion where the magnetic member 243 is located, that is, the directivity becomes sharper, compared to a portion where the magnetic member 243 is not disposed (for example, a portion below the coil 230 in the figure).

On the other hand, the signal magnetic flux M1 is distributed as follows.

In the space Z, a part of the signal magnetic flux M1 approaches the magnetic member 243 and passes therethrough. However, in other parts, since the length of the magnetic member 243 is shorter than the length L of the coil 230 , the signal magnetic flux M1 enters the core 220 and passes through the inside of the core 230 without passing through the magnetic member 243 .

(watch with antenna)

In addition, the antenna 203 is arranged inside the wristwatch as follows.

FIG. 19B is a vertical sectional view of the main part of the wristwatch having the antenna 203, and FIG. 19B is a horizontal sectional view of the main part of the wristwatch. As shown in FIG. 19B and FIG. 19C, the antenna 203 is disposed between the lower case portion 4b and the dial 5, the axial direction of the core 220 is parallel to the bottom cover 2c (or the dial 5), and the magnetic member 243 is above the core 220. (One side of the dial 5) is parallel to the dial 5.

(Effect)

As described above, according to the fourth embodiment, since the magnetic member 243 of the antenna 203 is shorter than the length L of the coil 230 , the directivity of the portion where the magnetic member 243 is disposed facing the core 220 is sharper than that of other portions. Therefore, as shown in FIGS. 19B and 19C , it is possible to realize a watch in which the receiving sensitivity is further improved by arranging the magnetic member 243 on the dial 5 side and the core 220 on the bottom cover 2c side.

(Modification)

In addition, the application of this invention is not limited to the above-mentioned embodiment, It can change suitably in the range which does not deviate from the concept of this invention. For example, the antenna may be configured as follows.

(A) When the core and the magnetic part are integrated

For example, in the above-mentioned second and fourth embodiments, the magnetic member and the core are separated to form the antenna, but both may be integrated. By integrating the magnetic part and the core, the inductance is kept constant. Therefore, compared with the conventional method of arranging the core and the magnetic part independently, it is possible to prevent the difference in inductance caused by manufacturing errors in each product or the difference based on the difference. Tuning off.

(A-1) When the core and the magnetic member are integrated in the second embodiment

FIG. 21 is a diagram showing an antenna 204 in which a magnetic member 241 and a core 220 are integrated in the second embodiment. According to this FIG. 21 , antenna 204 is configured to have core 220 around which coil 230 is wound at the center, magnetic member 241 , and fixing member 264 .

The fixing member 264 is formed using an insulating material such as resin. Furthermore, the fixing member 264 integrally fixes the magnetic material pieces 241a, 241b and the core 220 so that the arrangement relationship between the magnetic member 241 and the core 220 in the second embodiment described above is ensured.

(A-2) When the core and the magnetic member are integrated in the fourth embodiment

FIG. 22 is a diagram showing an antenna 205 in which a magnetic member 243 and a core 220 are integrated in the fourth embodiment. According to this FIG. 22 , the antenna 205 is configured to have a core 220 with a coil 230 wound around the center, a magnetic member 243 , and a fixing member 265 .

The fixing member 265 is formed using an insulating material such as resin. Furthermore, the fixing member 265 integrally fixes the magnetic member 243 and the core 220 so as to ensure the arrangement relationship between the magnetic member 243 and the core 220 in the fourth embodiment described above.

(B) The shape of the magnetic body

In addition, in the above-mentioned second embodiment, the shape of the magnetic body pieces 241a and 241b is set to a shape in which the plate-shaped body is bent at one place, but it may be set to a shape bent at multiple places, or may be Make it into the following shape.

(B-1) When the magnetic body is formed into a curved surface

FIG. 23A is a diagram showing an antenna 206 in which a magnetic sheet is formed into a curved shape. According to this FIG. 23A , antenna 206 has a core 220 in which a coil 230 is wound at the center and a magnetic member 246 in terms of configuration.

The magnetic member 246 is composed of a set of two magnetic pieces 246a, 246b that are bent and formed in substantially the same shape with approximately the same size. The magnetic pieces 246 a and 246 b are arranged such that their curved inner surfaces face the outer peripheral surface of the coil 230 . Furthermore, the distance between the magnetic pieces 246a, 246b, that is, the distance D4 between the ends on the central side facing the core 230 is smaller than the distance between the portion of the core 220 where the coil 230 is not wound and the other magnetic pieces 246a, 246b. The distance D5 between the ends on one side is long.

In addition, the distance between the core 220 and the magnetic pieces 246a and 246b is the longest at the end of the core 220 on the side facing the central portion of the coil 230, and the magnetic piece 246a is formed by bending to become shorter toward the other end. , 246b. That is, among the distances between the core 220 and the magnetic pieces 246 a and 246 b , the distance D6 to the end on the central portion side is the longest, and the distance D6 to the other end is the shortest.

Furthermore, in this case, as shown in FIG. 23B , the magnetic pieces 246a, 246b may be integrally fixed by a fixing member 267 formed of an insulating material in such a manner that the arrangement relationship between the above-mentioned magnetic member 246 and the core 220 is maintained. Antenna 207 with core 220 .

(B-2) Forming the magnetic body into a flat plate

FIG. 24A is a diagram showing an antenna 208 in which a magnetic sheet is formed into a planar shape. According to this FIG. 24A , antenna 208 has a core 220 in which a coil 230 is wound at the center and a magnetic member 248 in terms of configuration.

The magnetic member 248 is composed of a set of two magnetic pieces 248a and 248b formed in a flat plate shape with substantially equal sizes. Both the magnetic sheets 248 a and 248 b are arranged such that their longitudinal directions are parallel to the axial direction of the core 220 . Moreover, the distance D7 between the magnetic body pieces 248a, 248b is longer than the distance D8 between the part of the core 220 where the coil 230 is not wound, and the magnetic body pieces 248a, 248b.

Furthermore, in this case, as shown in FIG. 24B , the magnetic pieces 248a and 248b may be integrally fixed by a fixing member 269 formed of an insulating material so that the above-mentioned arrangement relationship between the magnetic member 248 and the core 220 is maintained. Antenna 209 with core 220 .

(C) Number of magnetic sheets constituting magnetic parts

In addition, in the above-mentioned second embodiment, the magnetic member 241 is constituted by a set of two magnetic material pieces 241a and 241b, but it may also be formed by a set of three or more magnetic material pieces.

(C-1) When there are three or more magnetic sheets in the second embodiment

FIG. 25A is a diagram showing an antenna 211 whose magnetic member is composed of three magnetic sheets. According to this FIG. 25A , antenna 211 has a core 220 in which a coil 230 is wound at the center and a magnetic member 251 in terms of configuration.

The magnetic member 251 is composed of a set of three magnetic material pieces 251 a , 251 b , and 251 c formed by separating two portions of a plate-shaped body that is bent at substantially the same angle in the same direction in the same direction from the coil 230 . .

In this case, as shown in FIG. 25B , the magnetic body 251 and the core 220 may be integrally fixed by the fixing member 272 formed of an insulating material in such a manner that the above-mentioned arrangement relationship between the magnetic member 251 and the core 220 is maintained. Antenna 212.

(C-2)

In addition, in the above-mentioned modified example (B-2) (see FIG. 24 ), the magnetic member may be constituted by three or more magnetic material pieces.

FIG. 26A is a diagram showing an antenna 213 whose magnetic member is composed of three magnetic sheets. According to this FIG. 26A , the antenna 213 has a core 220 in which a coil 230 is wound at the center, and a magnetic member 253 .

The magnetic member 253 is composed of a set of three magnetic pieces 253 a , 253 b , and 253 c formed in a flat plate shape with substantially equal sizes. The magnetic sheets 253 a , 253 b , and 253 c are all arranged such that their longitudinal directions are parallel to the axial direction of the core 220 .

In this case, as shown in FIG. 26B , the magnetic bodies 253a, 253b, 253c and core 220 of the antenna 214 .

(D) When the magnetic sheets are connected

In addition, in the above-mentioned second embodiment, the isolation of the magnetic member 241 may be connected by a connecting member formed of a non-magnetic material or a material having a relative magnetic permeability much smaller than that of the magnetic material forming the core 220 and the magnetic member 241. The part is between the magnetic sheets 241a and 241b.

Fig. 27 is a diagram showing an antenna 215 in which magnetic sheets 241a and 241b are connected in the second embodiment. According to this FIG. 27 , antenna 215 has core 220 around which coil 230 is wound at the center, magnetic member 241 (magnetic material sheets 241 a , 241 b ), and connecting member 290 .

The connection member 290 is formed using a non-magnetic material (or a material having a relative magnetic permeability much smaller than the magnetic material forming the core 220 and the magnetic member 241 ), and is provided by connecting the magnetic pieces 241a and 241b. The magnetic pieces 241a and 241b are integrally fixed by the connecting member 290, so that the manufacture of the wristwatch becomes easy. At the same time, since the distance D1 between the magnetic pieces 214a and 241b is kept constant, the effect of preventing manufacturing errors can be obtained. .

In addition, in FIG. 27 , the case where the second embodiment is applied is shown, but it is applied to the above-mentioned modified examples (A-1), (B), and (C) respectively, and constitutes a magnetic connection of each antenna connected by a connecting member. The antenna formed between the body pieces is also self-evident.

(E) The case where the magnetic member is formed from amorphous

In addition, in the above-mentioned second to fourth embodiments, the magnetic member is formed of ferrite, but it may also be formed of amorphous.

FIG. 28 is a diagram showing an antenna 216 in which a magnetic member is formed of an amorphous material in the second embodiment. According to this FIG. 28 , the antenna 216 is configured to have a core 220 with a coil 230 wound around the center and a magnetic member 256 .

The magnetic member 256 is composed of magnetic pieces 256a and 256b having substantially the same size and substantially the same shape. Furthermore, the magnetic sheets 256a and 256b are formed by laminating thin plate-like amorphous materials. This is because the conductivity of amorphous is larger than that of ferrite, and the eddy current formed by the magnetic flux is easy to generate. It is formed by laminating thin plate-shaped amorphous, which can reduce the conductivity of AC and suppress The eddy current of the magnetic member 256 is generated.

(F) When multiple magnetic parts are arranged

In addition, in the second and third embodiments described above, the antenna has one magnetic member, but may have a plurality of magnetic members in the axial circumferential direction of the core.

(F-1) When the second embodiment has a plurality of magnetic members

29A to 29C are diagrams showing an antenna 217 having two magnetic members 241 in the second embodiment. FIG. 29A shows a plan view of the antenna 217 , FIG. 29B shows a front view of the antenna 217 , and FIG. 29C shows a side view of the antenna 217 . According to these figures, the antenna 217 has a core 220 around which a coil 230 is wound at the center, and two magnetic members 241-1 and 241-2. The two magnetic members 241-1 and 241-2 are arranged along the axial direction of the core 220. Stagger about 90 degrees from each other.

Furthermore, the antenna 217 is arranged inside the wristwatch as shown in Figs. 30A and 30B. FIG. 30A is a vertical sectional view of the main part of the wristwatch having the antenna 217, and FIG. 30B is a horizontal sectional view of the main part of the wristwatch.

According to this figure 29, the antenna 217 is arranged between the bottom cover 2c and the dial 5, wherein the axis direction of the core 220 is parallel to the bottom cover 2c (or the dial 5), and one magnetic member 241-1 is below the core 220. While facing the bottom cover 2c, the other magnetic member 241-2 faces the inner surface of the case 2 closest to the antenna 217 on the side of the core 220. Thus, by the magnetic member 241-1 located between the core 220 and the bottom cover 2c, the eddy current loss generated on the bottom cover 2c can be suppressed, and by the magnetic member located between the core 220 and the inner surface of the case 2 241-2, the eddy current loss generated on the inner surface is also suppressed.

Furthermore, in this case, as shown in FIG. 31 , it is also possible to configure the two magnetic members 241 to be integrally fixed by a fixing member 278 formed of an insulating material so as to maintain the arrangement relationship between the above-mentioned two magnetic members 241 and the core 220 . Component 241 and core 220 of the antenna. FIG. 31A is a plan view of the antenna 218 , FIG. 31B is a front view of the antenna 218 , and FIG. 31C is a side view of the antenna 218 .

(F-2) In the case of having a plurality of magnetic members in the third embodiment

32A to 32C are diagrams showing an antenna 219 having two magnetic members 242 in the third embodiment. FIG. 32A shows a plan view of the antenna 219 , FIG. 32B shows a front view of the antenna 219 , and FIG. 32C shows a side view of the antenna 219 . According to these figures, the antenna 219 has a core 220 around which a coil 230 is wound at the center, two magnetic members 242-1, 242-2, and a fixing member 279. The two magnetic members 242-1, 242-2 are arranged along the core. The axial circumferential directions of 220 are staggered by about 90 degrees from each other.

Furthermore, this antenna 219 is arranged inside the wristwatch in the same manner as the above-mentioned modified example (F-1), wherein one magnetic member 241-1 faces the bottom cover 2c under the core 220, and the other magnetic member 241 - 2 faces the inner surface of the case 2 closest to the antenna 219 on the side of the core.

(G) Magnetic component of the fourth embodiment

In addition, in the fourth embodiment described above, the magnetic member 243 may be constituted by a plurality (two or more) of magnetic material pieces spaced apart and facing the core 230 . In addition, the end portion may be bent at one or more places.

(H) Shape of magnetic parts

In addition, in the above-mentioned second to fourth embodiments, the magnetic member has a bent shape or a flat plate shape, but may be, for example, a rod-shaped body (the cross-sectional shape may be arbitrarily circular, polygonal, etc.).

As described above, it can be seen that the antenna of this embodiment (for example, the antenna 201 of FIGS. 13A-13D ) is characterized in that it has a rod-shaped core (for example, the core 220 of FIGS. 13A-13D ), A plate-shaped magnetic member (for example, the magnetic body 241 in FIGS. 13A-13D ) disposed opposite to the space along the axial direction of the core. It is composed of a plurality of isolated magnetic sheets (for example, the magnetic sheets 241a and 241b in FIGS. 13A-13D ).

According to the antenna having such a configuration, it is possible to realize an antenna in which a plate-shaped magnetic member composed of a plurality of magnetic pieces spaced apart from the core at a position opposite to the winding portion of the core is arranged opposite to the core in the axial direction of the core. . In the antenna, a time-varying magnetic flux (generated magnetic flux) is generated such as to obstruct the signal flux (magnetic flux generated by the magnetic field component of the received radio wave) passing (linked) inside the winding, but at this time, the signal flux Take the path with less reluctance. Consequently, the signal flux passing through the isolation portion having a large reluctance is extremely small, and more signal flux passes through the core. That is, since the signal flux intersecting the winding link increases, the receiving efficiency improves.

In this case, each magnetic piece of the antenna may be formed by bending into a predetermined shape, and the distance between it and the above-mentioned core is the longest at the end of the above-mentioned core on the side facing the winding portion. The farther to the other end, the shorter.

According to the antenna of this embodiment, the distance between each magnetic piece can be realized so that the distance between the core is the longest at the end on the side facing the winding portion of the core, and becomes shorter toward the other end. Formed by bending into a predetermined shape. Thereby, since the reluctance inside the magnetic member is extremely small compared with the reluctance in the air, so avoiding the path that enters the core from the end of the core of the magnetic sheet on the position side facing the winding portion, The other end of the sheet enters into a portion of the core other than the winding portion and passes through the core. As a result, since more signal flux intersects with the winding link, the reception efficiency is further improved.

In addition, like the antenna of the embodiment, it may further include a connecting member made of a non-magnetic material (for example, connecting member 290 in FIG. 27 ) that connects the plurality of magnetic pieces to each other at the isolated portion.

According to the antenna of this embodiment, since the reluctance inside the connecting member made of a nonmagnetic material is larger than the reluctance inside the magnetic member, it is possible to realize an antenna having the same effect as the antenna described above.

In addition, like the antenna of the present embodiment, a plurality of the magnetic members may be arranged in the circumferential direction of the core axis of the core.

According to the antenna of this embodiment, it is possible to realize an antenna in which a plurality of magnetic members are arranged in the circumferential direction of the core axis of the core.

In addition, like the antenna of this embodiment, it may further include a fixing member (for example, fixing member 264 in FIG. 21 ) that integrally fixes the core and the magnetic member.

According to the antenna of this embodiment, it is possible to realize an antenna in which the core and the magnetic member are integrally fixed by the fixing member. That is, since the inductance of the antenna is kept constant by fixing the core and the magnetic member, it is possible to prevent out-of-tuning caused by changes in the inductance of the antenna. Furthermore, the fixing member is preferably formed of an insulating material.

In addition, the antenna of this embodiment (for example, antenna 203 in FIG. 19 ) is characterized in that it has a rod-shaped core (for example, core 220 in FIG. 19 ) in which a winding wire is wound at the center, and the The plate-shaped magnetic members (for example, the magnetic member 243 in FIG. 19 ) arranged facing each other at a distance have a length in the longitudinal direction shorter than the length of the winding portion of the core.

According to the antenna of this embodiment, it is possible to realize an antenna in which a plate-shaped magnetic member whose length in the longitudinal direction is shorter than the length of the winding portion of the core is arranged opposite to the core at a distance from the core in the axial direction. That is, in the surrounding space of the antenna, in the portion where the magnetic member is arranged facing each other, the directivity of the magnetic member becomes sharper due to the concentrated generation of magnetic flux by the magnetic member.

In this case, like the antenna of the embodiment, it may further include a fixing member integrally fixing the core and the magnetic member.

According to the antenna of this embodiment, it is possible to realize an antenna in which the core and the magnetic member are integrally fixed by the fixing member. That is, since the inductance of the antenna is kept constant by fixing the core and the magnetic member, it is possible to prevent out-of-tuning caused by changes in the inductance of the antenna. Furthermore, the fixing member is preferably formed of an insulating material.

In addition, the antenna of this embodiment (for example, the antenna 202 in FIGS. 18A to 18D ) is characterized by having a rod-shaped core (for example, the core 220 in FIGS. The axial direction of the core is spaced apart from the plate-shaped magnetic member (for example, the magnetic member 242 in FIGS. 18D fixing part 262).

According to the antenna of this embodiment, it is possible to realize an antenna in which a plate-shaped magnetic member is arranged to face the core at a distance from the core in the axial direction, and the core and the magnetic member are integrally fixed by the fixing member. In the antenna, a time-varying magnetic flux (generated magnetic flux) is generated such as to obstruct the signal flux (magnetic flux generated by the magnetic field component of the received radio wave) passing (linked) inside the winding, but at this time, the signal flux Take the path with less reluctance. Consequently, the signal flux passing through the isolation portion having a large reluctance is extremely small, and more signal flux passes through the core. That is, since the signal flux intersecting the winding link increases, the receiving efficiency improves. In addition, since the inductance of the antenna is kept constant by fixing the core and the magnetic member, it is possible to prevent out-of-tuning caused by changes in the inductance of the antenna. Furthermore, the fixing member is preferably formed of an insulating material.

In addition, the antenna of this embodiment (for example, antenna 219 in FIG. 20 ) is characterized in that it has a rod-shaped core (for example, core 220 in FIG. 32 ) in which a winding wire is wound at the center, and a The plate-shaped magnetic member (for example, the magnetic member 242 in FIGS. 32A～the fixing part 279 of Fig. 32C).

According to the antenna of this embodiment, it is possible to realize an antenna in which a plurality of plate-shaped magnetic members are arranged to face the core at a distance from the core in the direction of the core axis, and the core and the magnetic member are integrally fixed by the fixing member. In the antenna, a time-varying magnetic flux (generated magnetic flux) is generated such as to obstruct the signal flux (magnetic flux generated by the magnetic field component of the received radio wave) passing (linked) inside the winding, but at this time, the signal flux Take the path with less reluctance. Consequently, the signal flux passing through the isolation portion having a large reluctance is extremely small, and more signal flux passes through the core. That is, since the signal flux intersecting the winding link increases, the receiving efficiency improves. In addition, since the inductance of the antenna is kept constant by fixing the core and the magnetic member, it is possible to prevent out-of-tuning caused by changes in the inductance of the antenna. Furthermore, the fixing member is preferably formed of an insulating material.

Furthermore, the radio-controlled watch of this embodiment (for example, the watch 1 shown in FIGS. 15 to 19A to 19C) is characterized by having the antenna shown in FIGS. 15 to 17 and a watch body housing and disposing the antenna therein.

According to the present embodiment, in an antenna incorporated in a watch-type radio-controlled timepiece, eddy current loss due to metal existing near a metal bottom cover or the like can be suppressed, and radio wave reception efficiency (reception sensitivity) can be improved. .

Claims (6)

1. An antenna (219), characterized in that it has: a rod-shaped core (220), which is wound with a winding wire (230) at the central part; a plurality of magnetic components (242-1, 242-2), which are spaced apart from the core along the axial direction of the winding on the core, and are respectively arranged in the axial circumferential direction of the core; and A fixing member (279) for fixing the core and the plurality of magnetic members to each other. 2. A radio-controlled watch (1), characterized in that it has the antenna (219) according to claim 1 and a watch body (2) in which the antenna is arranged. 3. A radio-controlled watch (1), characterized in that it has the antenna (219) according to claim 1, a metal watch body (2) in which the antenna is arranged inside, and the bottom of the metal watch body Metal bottom cover parts (2c) to cover, The first magnetic member (242-1) of the plurality of magnetic members is opposed to the metal bottom cover member, and the second magnetic member (242-2) of the plurality of magnetic members is opposed to the metal bottom cover member. The watch body made of metal is opposite to each other. 4. A radio-controlled watch (1), comprising: a metal cylindrical watch body (2), and a metal bottom cover that closes one of the open ends of the cylindrical watch body The member (2c), the watch glass member (2a) closing the other opening end of the opening ends of the cylindrical watch body, and the antenna (219) disposed in the watch body are characterized in that The aforementioned antennas include: a rod-shaped core (220), which is wound with a winding wire (230) at the central part; a plurality of magnetic members (242-1, 242-2), which are spaced apart from the core along the axial direction of the winding on the core, and arranged in the axial circumferential direction of the core and inside the bottom cover member a position opposite to the side and opposite to the inner side of the above-mentioned watch body; and A fixing member (279) for fixing the core and the plurality of magnetic members to each other. 5. A radio wave watch, comprising: a cylindrical case (2) formed of metal; a bottom cover part (2c) formed of metal covering the underside of the case; a watch glass part (2a) covering the upper side of said watch case; and An antenna (202) accommodated in a space surrounded by the watch case, the bottom cover member, and the watch glass member, It is characterized in that, The aforementioned antennas include: a rod-shaped core (220), which is wound with a winding wire (230) at the central part; A magnetic member (242) for preventing eddy current loss is disposed opposite to the outer peripheral surface of the winding wire wound around the central portion of the core at a predetermined interval; and a fixing part (262) made of an insulating material for fixing the magnetic part and the above-mentioned core, Here, the magnetic member is arranged parallel to the bottom cover member on the bottom cover member side, and the rod-shaped core is arranged on the watch glass member side. 6. A radio wave watch, comprising: a cylindrical case (2) formed of metal; a bottom cover part (2c) formed of metal covering the underside of the case; a watch glass part (2a) covering the upper side of said watch case; and an antenna (219) accommodated in a space surrounded by the watch case, the bottom cover member, and the watch glass member, It is characterized in that, The aforementioned antennas include: a rod-shaped core (220), which is wound with a winding wire (230) at the central part; The first magnetic member and the second magnetic member (142-1, 142-2) for preventing eddy current loss are disposed opposite to the outer peripheral surface of the above-mentioned winding in the axial circumferential direction of the core at a predetermined interval ;as well as a fixing part (279), which is made of an insulating material, and is used to fix the first magnetic part and the second magnetic part to the above-mentioned core, Wherein, the first magnetic member (142-1) is arranged opposite to the bottom cover member, and on the other hand, the second magnetic member (142-2) is arranged opposite to the case.

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