JP5716470B2 - Electronic clock with built-in antenna - Google Patents

Description

  The present invention relates to an antenna built-in electronic timepiece having a built-in antenna for receiving radio waves transmitted from the outside.

  2. Description of the Related Art Conventionally, an electronic timepiece with a built-in antenna that performs processing such as time correction by receiving radio waves including time information from the outside with an antenna is known. In such an electronic timepiece with a built-in antenna, it is known to improve the magnetic flux collection effect in the antenna in order to improve the reception sensitivity of the antenna (for example, see Patent Document 1).

  The electronic timepiece with a built-in antenna of Patent Document 1 has an antenna inside, and the antenna is attached to the antenna core, a coil wound around the central portion of the antenna core, and both ends of the antenna core with an adhesive or the like. Attached magnetic flux collecting member. The magnetic flux collecting member is laminated and fixed on the surface of the antenna core. According to this configuration, when the antenna is placed in a magnetic field generated by wireless radio waves, the magnetic flux generated by the radio waves is attracted to the magnetic flux collecting member. The reception sensitivity of the antenna is improved.

JP 2007-184894 A

  By the way, the internal space of the timepiece is generally restricted, and if the magnetic flux collecting member is fixed to the surface of the antenna core, it may interfere with other components. Therefore, it is necessary to arrange the magnetic flux collecting member so as not to interfere with other components, and there is a problem that the arrangement position and size of the magnetic flux collecting member increase.

  An object of the present invention is to provide an electronic timepiece with a built-in antenna capable of reducing the size restriction of the magnetic flux collecting member and improving the antenna characteristics with a simple configuration.

  The electronic watch with a built-in antenna of the present invention includes a metal exterior case, an antenna that receives external wireless information, a receiving means that processes the external wireless information received by the antenna, and the antenna and the receiving means. A module housed inside, and an outer frame and a middle frame disposed between the modules, the antenna includes a magnetic core and a coil wound around the magnetic core, The magnetic core includes a coil winding portion wound around the coil and lead portions extending from both ends of the coil winding portion, and the inner frame is located at a position where it is magnetically coupled to the lead portion. A magnetism collecting member is provided.

In the present invention, a magnetism collecting member is provided in the middle frame. Here, the middle frame is disposed between the outer case and the module. If this inner frame is used, watches having different sizes and shapes can be manufactured using a common module. Therefore, the size and shape of the middle frame are changed according to the size and shape of the module and the outer case.
For example, when a watch is used for a watch with a different exterior case size, such as for men and women, the large frame inner frame has a larger area than the small watch inner frame. . In addition, since wristwatches have many circular cases in plan view, modules are often circular in plan view. For example, when this circular module is incorporated in a watch having a rectangular or bucket-shaped outer case in plan view, for example, the distance between the module and the four corners of the outer case is increased, and the plane area of the inner frame is increased.
In these cases, the size (area) of the magnetic flux collecting member provided in the middle frame can be made relatively large. Further, since the middle frame is between the module and the outer case, there is no possibility of interference with the components in the module. For this reason, when the magnetic flux collecting member is provided in the middle frame, there are few restrictions on the size of the magnetic flux collecting member. Therefore, if a magnetism collecting member is provided in the middle frame, the plane area can be made relatively large, the magnetism collecting effect can be enhanced, and the antenna characteristics can be improved.

The inner frame is usually formed of a synthetic resin or the like, and can be complicatedly molded or integrally formed with a magnetism collecting member. Therefore, when the magnetic flux collecting member is provided in the middle frame as in the present invention, the arrangement of the magnetic flux collecting member can be freely set as long as it is within the middle frame, so the optimum distance between the magnetic flux collecting member and the antenna lead portion. Can be set to Even when watches having different sizes and shapes using a common module are manufactured, the antenna characteristics can be improved.
Note that if the distance between the magnetic flux collecting member and the antenna lead portion changes even slightly during reception processing by the receiving means, the tuning frequency of the antenna fluctuates, and reception performance deteriorates. On the other hand, when the magnetic flux collecting member is provided in the middle frame as in the present invention, the distance between the magnetic flux collecting member and the antenna lead portion can be fixed, so the tuning frequency of the antenna does not vary.
Further, in the present invention, the magnetic flux collecting member is provided in the middle frame that has been conventionally used as a timepiece component. Therefore, when assembling the timepiece, there is no need for a step of attaching the magnetic flux collecting member to the inner peripheral surface of the outer case, and the timepiece is excellent in assemblability. In addition, since a magnetic flux collecting member can be easily placed between the exterior case and the antenna without the need for new parts, the arrangement of the magnetic flux collecting member prevents the watch from increasing in size and thickness. it can.

In the antenna built-in type electronic timepiece of the invention, it is preferable that the magnetic flux collecting member is an amorphous foil material embedded in the inner frame.
Since the amorphous foil material is thin and has a high magnetic permeability, the watch can be further reduced in size and thickness by using the amorphous foil material as a magnetic flux collecting member. In addition, by embedding the amorphous foil material in the inner frame in this way, the amorphous foil material can be protected by the inner frame even when an impact is applied like when the electronic timepiece with built-in antenna of the present invention is dropped. The impact resistance can be improved.

  In the electronic timepiece with built-in antenna according to the present invention, the magnetism collecting member includes a magnetism collecting portion provided along a surface of the inner frame and a magnetic coupling provided along an inner peripheral surface of the inner frame. It is preferable that the magnetic coupling portion is provided at a position where the magnetic coupling portion is magnetically coupled to the lead portion.

  In an electronic timepiece with a built-in antenna having a metal exterior case, the exterior case blocks radio waves, so that the radio waves enter the module from the dial side. In the present invention, the middle frame is provided with a magnetism collecting portion along the surface of the middle frame, and the magnetic coupling portion is provided along the inner peripheral surface. The magnetic collecting portion collects radio waves coming from the dial plate side, and is magnetically coupled to the antenna lead portion at the magnetic coupling portion, thereby enhancing the magnetic collection effect.

In the antenna built-in type electronic timepiece of the invention, the inner frame is provided with two magnetic flux collecting members, and the two magnetic flux collecting members are magnetically coupled to the lead portions at both ends of the magnetic core. It is preferable to be provided at a position where the
In the present invention, the two magnetic flux collecting members are provided at positions where they are magnetically coupled to the lead portions at both ends of the magnetic core. In such a case, as compared with the case where one magnetism collecting member is provided in the middle frame and the magnetism collecting member is arranged at a position where only one of the lead portions of the magnetic core is magnetically coupled, The effect can be enhanced.

In the antenna built-in type electronic timepiece of the invention, it is preferable that the magnetism collecting member is provided on the inner frame by insert molding.
As described above, when the magnetic flux collecting member is provided on the middle frame by insert molding, the assembly of the timepiece can be improved as compared with the case where the magnetic flux collecting member is bonded to the middle frame. Further, even when an impact is applied as in the case where the electronic timepiece with built-in antenna of the present invention is dropped, the magnetism collecting member can be protected by the inner frame, the strength can be increased, and the impact resistance performance can be improved.

1 is a front view of a radio-controlled timepiece as an electronic timepiece with built-in antenna according to a first embodiment of the present invention. The top view which shows schematic structure which looked at the electromagnetic wave correction timepiece of the said embodiment from the back cover side. The block diagram which shows schematic structure of the electromagnetic wave correction timepiece of the said embodiment. The block diagram which shows the structure of the receiving circuit part of the radio wave correction timepiece of the embodiment. The schematic sectional side view at the time of cut in the thickness direction of the radio wave correction timepiece of the embodiment. The top view which shows schematic structure which looked at the electromagnetic wave correction timepiece of 2nd embodiment from the back cover side. The top view which shows schematic structure which looked at the electromagnetic wave correction timepiece of 3rd embodiment from the back cover side. The schematic sectional side view at the time of making a cross section in the thickness direction of the radio-controlled timepiece of another embodiment of the present invention.

[First embodiment]
Hereinafter, a first embodiment according to the present invention will be described with reference to the drawings.
[Configuration of radio-controlled clock]
In FIG. 1, a radio-controlled timepiece 1 is a pointer-type timepiece (analog timepiece) having an hour hand 11, a minute hand 12, a second hand 13 and a dial 14 and receives a long-wave standard radio wave as external wireless information having time information. The timepiece 11, the minute hand 12, and the second hand 13 can be corrected based on the received time information.
The radio-controlled timepiece 1 includes an hour hand 11, a minute hand 12 and a second hand 13, a dial 14, a dial ring 15 (see FIG. 5), an antenna 21 for receiving standard radio waves, an hour hand 11, a minute hand 12 and a second hand 13. A module 10 (see FIG. 2) in which various components for controlling the operation are incorporated, an outer case 100 that houses an hour hand 11, a minute hand 12, a second hand 13, a dial plate 14, the module 10, and the like, and the module 10 and the outer case 100 And an intermediate frame 5 (see FIGS. 2 and 5) disposed between the two.

[Configuration of exterior case]
First, the configuration of the exterior case 100 of the radio-controlled timepiece 1 will be described.
As shown in FIGS. 2 and 5, the outer case 100 is attached to the casing 110 as the trunk, the cover glass 120 attached to the front surface side of the casing 110, and the back surface (lower end surface) side of the casing 110. And a metal back cover 130.

  The casing 110 is made of a metal material such as stainless steel, brass, or titanium. The casing 110 is formed in a substantially cylindrical shape, and an inner peripheral shape and an outer peripheral shape are formed in a substantially rectangular plane.

[Module configuration]
Next, the configuration of the module 10 of the radio-controlled timepiece 1 will be described.
As shown in FIG. 2, the module 10 includes a receiving IC 86, a CPU 87, a reference vibrator 311 (see FIG. 3) and the like, a circuit board (not shown), and motors 411 and 421 constituting a part of the driving unit 4. Each component member such as a high-capacity secondary power source (secondary battery) 72 constituting the wheel train and the power supply means 7 is incorporated. In addition, the module 10 incorporates an antenna 21 that receives radio waves as external wireless information at a position close to the outer case 100.
As shown in FIG. 3, the circuit board incorporated in the module has a receiving means 2 for processing radio waves received by the antenna 21, a drive control circuit section 3, a driving means for driving the hour hand 11, the minute hand 12, and the second hand 13. 4 and a counter section 6 for counting time are provided as various circuit configurations.

  The receiving means 2 is composed of a capacitor and the like, and is tuned to a radio wave received by the antenna 21, a receiving circuit unit 23 that processes information received by the antenna 21, and a time processed by the receiving circuit unit 23 And a time data storage circuit unit 24 for storing data.

As shown in FIG. 4, the tuning circuit unit 22 includes two capacitors 22A and 22B connected in parallel to the antenna 21, and one capacitor 22B is connected to the antenna 21 via the switch 22C. Has been.
The frequency of the radio wave received by the antenna 21 is switched by turning on or off the switch 22C according to a frequency switching control signal output from the drive control circuit unit 3. As a result, for example, in Japan, two types are output from the standard radio wave output station of Otakado and Mt. (East Japan) with a transmission frequency of 40 kHz and the standard radio wave output station of Mt. It is configured to be able to switch and receive a long wave standard radio wave having a frequency of.

As shown in FIG. 4, the reception circuit unit 23 includes an amplification circuit 231 that amplifies the longwave standard radio signal received by the antenna 21, and a bandpass filter that extracts only a desired frequency component from the amplified longwave standard radio signal. 232, a demodulation circuit 233 for smoothing and demodulating the long wave standard radio signal, an AGC (Automatic Gain Control) circuit 234 for controlling the gain of the amplification circuit 231 and controlling the reception level of the long wave standard radio signal to be constant, And a decoding circuit 235 that decodes and outputs the demodulated long-wave standard radio signal.
The time data received and signal-processed by the receiving circuit unit 23 is output to and stored in the time data storage circuit unit 24 as shown in FIG.
The reception circuit unit 23 starts receiving time information based on a reception control signal output from the drive control circuit unit 3 by a preset schedule, a forced reception operation by the external input device 8, or the like.

  As shown in FIG. 3, the drive control circuit unit 3 receives a pulse signal from the pulse synthesis circuit 31. The pulse synthesizing circuit 31 divides a reference pulse from a reference oscillator 311 such as a crystal oscillator to generate a clock pulse, and generates a pulse signal having a different pulse width and timing from the reference pulse. The reference vibrator 311 is connected to the CPU 87 and becomes a clock signal of the circuit. However, since the frequency is close to the long wave reception frequency and there is a possibility that a signal is mixed in the antenna 21 as noise, it is separated from the antenna 21. Are arranged.

  The drive control circuit unit 3 outputs a second drive pulse signal PS1 that is output once per second to drive the second hand 13, and an hour / minute drive pulse signal PS2 that is output once per minute to drive the minute hand 12 and the hour hand 11. It outputs to the second drive circuit 41 and the hour / minute drive circuit 42 to control the driving of the hour hand 11, the minute hand 12 and the second hand 13. That is, the drive circuits 41 and 42 drive the second motor 411 and the hour / minute motor 421 which are stepping motors driven by the pulse signals from the drive circuits 41 and 42, and thereby the second hands connected to the motors 411 and 421. 13 and the minute hand 12 and the hour hand 11 are driven. The hour hand 11, the minute hand 12, the second hand 13, the dial 14, the motors 411 and 421, and the drive circuits 41 and 42 constitute time display means for displaying the time. In addition, as a time display means, you may drive the hour hand 11, the minute hand 12, and the second hand 13 with one motor.

The counter unit 6 includes a second counter circuit unit 61 that counts seconds and an hour / minute counter circuit unit 62 that counts hours and minutes.
The second counter circuit unit 61 includes a second position counter 611, a second time counter 612, and a coincidence detection circuit 613. Both the second position counter 611 and the second time counter 612 are counters that loop in 60 seconds when a signal of 60 counts, that is, 1 Hz is input. The second position counter 611 counts the drive pulse signal (second drive pulse signal PS1) supplied from the drive control circuit unit 3 to the second drive circuit 41. That is, the position of the hand indicated by the second hand 13 is counted by counting the drive pulse signal that drives the second hand.
The second time counter 612 normally counts a 1 Hz reference pulse signal (clock pulse) output from the drive control circuit unit 3. When the time data is received by the receiving means 2, the counter value is corrected according to the second data of the time data.

Similarly, the hour / minute counter circuit unit 62 includes an hour / minute position counter 621, an hour / minute time counter 622, and a coincidence detection circuit 623. Both the hour / minute position counter 621 and the hour / minute time counter 622 are counters that loop when signals for 24 hours are inputted. The hour / minute position counter 621 counts the drive pulse signal (hour / minute drive pulse signal PS2) supplied from the drive control circuit unit 3 to the hour / minute drive circuit 42, and indicates the position of the hands indicated by the hour hand 11 and the minute hand 12. Counting.
The hour / minute / time counter 622 normally counts 1 Hz pulses (clock pulses) output from the drive control circuit unit 3 (more precisely, 1 Hz is counted when 60 times are counted). When the time data is received by the receiving means 2, the counter value is corrected according to the hour / minute data of the time data.

The coincidence detection circuits 613 and 623 detect coincidence of the count values of the position counters 611 and 621 and the time counters 612 and 622 and output a detection signal indicating whether or not they coincide to the drive control circuit unit 3.
When the mismatch signal is input from the match detection circuits 613 and 623, the drive control circuit unit 3 continues to output the drive pulse signals PS1 and PS2 until the match signal is input. For this reason, during normal hand movement, when the counter values of the time counters 612 and 622 are changed by the 1 Hz reference signal from the drive control circuit unit 3 and do not coincide with the position counters 611 and 621, the drive pulse signals PS1 and PS2 are output. As the hour hand 11, the minute hand 12, and the second hand 13 move, the position counters 611 and 621 coincide with the time counters 612 and 622. By repeating this operation, normal hand movement control is performed.
When the time counters 612 and 622 are corrected with the received time data, the drive pulse signals PS1 and PS2 are continuously output until the counter values of the position counters 611 and 621 coincide with the counter values, and the hour hand 11 and the minute hand 12 and the second hand 13 are fast-forwarded to correct the correct time.

  The power supply means 7 includes a power generation device 71 configured by a self-winding generator, a solar battery (solar panel 74), and the like, and a high-capacity secondary power source 72 that stores the power generated by the power generation device 71. Has been. As the high capacity secondary power source 72, a secondary battery such as a lithium ion battery can be used. As the power supply means 7, a primary battery such as a silver battery may be used. In addition, the high-capacity secondary power source 72 is configured by a stainless steel case, and in order to suppress the influence on the antenna characteristics, as shown in FIG. It is arranged at the position.

  An external input device 8 as an external input means includes a crown 81, a button 82, and the like, and is used for performing a receiving operation, time adjustment, and the like.

The antenna 21 is disposed at a position in the 9 o'clock direction of the timepiece substantially along the inner surface of the middle frame 5.
The antenna 21 includes a magnetic core 211 and a coil 212 wound around the magnetic core 211.
As shown in FIG. 5, the magnetic core 211 has a substantially square cross section. In addition, as shown in FIG. 2, the magnetic core 211 includes a linear coil winding portion 211C around which the coil 212 is wound, and a casing that forms a body portion of the outer case 100 from both ends of the coil winding portion 211C. 110 is provided with a lead portion 211D protruding in a state along the inner periphery.

  The magnetic core 211 is formed by, for example, punching a cobalt-based amorphous foil (e.g., Co 50 wt% or more amorphous foil) with a mold, or bonding about 10 to 30 pieces formed by etching, and superposing and annealing. Heat treatment is performed to stabilize the magnetic properties. That is, the magnetic core 211 is configured by laminating planar amorphous foils in the thickness direction of the watch. Note that the magnetic core 211 is not limited to the laminated amorphous foil, and ferrite may be used. In this case, the magnetic core 211 may be formed by a mold or the like and heat-treated.

  The coil 212 needs an inductance value of about 10 mH when receiving a long-wave standard radio wave (40 to 77.5 kHz). For this reason, in this embodiment, the coil 212 is formed by winding a uremet wire having a diameter of about 0.1 μm for several hundred turns. The coil 212 includes a first coil end 212A having a predetermined dimension from one end (first core end 211A) of the magnetic core 211, and the other end (second core end) of the magnetic core 211. The coil winding portion 211C extending from the portion 211B) to the second coil end portion 212B having a predetermined size is wound around the circumferential surface along the circumferential direction with the longitudinal direction of the magnetic core 211 as an axis.

  The antenna 21 and the receiving IC 86 are connected by two wires. That is, the antenna 21 and the receiving IC 86 are electrically connected by taking out the coil 212 from the end of the antenna and soldering it to the circuit board. As a result, the standard radio wave received by the antenna 21 can be output to the receiving means 2. The electrical connection may be performed by attaching a flexible substrate made of polyimide or the like to the antenna 21 and screwing the substrate to the circuit board.

[Configuration of the middle frame]
Next, the configuration of the middle frame 5 in the radio-controlled timepiece 1 will be described.
The middle frame 5 is a component made of synthetic resin and disposed between the outer case 100 and the module 10. The outer peripheral shape of the middle frame 5 is a quadrangular shape in the plan view, and the inner peripheral shape of the middle frame 5 is a circular shape in the plan view. In the middle frame 5, the front surface 50 </ b> A of the middle frame 5 faces the dial plate 14 and the solar panel 74, and the back surface 50 </ b> B of the middle frame 5 faces the back cover 130 of the exterior case 100.
The inner frame 5 is disposed so as to contact the inner peripheral surface of the outer case 100. The outer peripheral surface 50D of the inner frame 5 contacts the inner peripheral surface of the outer case 100 in the radial direction. A plurality of protrusions (not shown) may be formed. In such a case, these protrusions may be arranged along the inner peripheral surface of the outer case 100.

  The middle frame 5 is provided with two magnetism collecting members 51 as shown in FIG. Further, in the plan view, the two magnetic flux collecting members 51 are provided at positions close to the lead portions 211D at both ends of the magnetic core 211, respectively. As will be described later, the two magnetic flux collecting members 51 are magnetically coupled to the lead portions 211D at both ends of the magnetic core 211, respectively.

  Examples of the magnetic flux collecting member 51 include cobalt-based amorphous (Co—Fe—Ni—B—Si). The magnetic flux collecting member 51 is, for example, cobalt-based amorphous (Co—Fe—Ni—B—Si) and has a relative magnetic permeability of 20000. On the other hand, when stainless steel is used as the outer case 100 and the back cover 130, the relative permeability is 1.4, the relative permeability when brass is used is 1.0, and the ratio when titanium is used. The permeability is 1.0001. Therefore, the magnetic permeability of the magnetic flux collecting member 51 is much larger than that of the metal constituting the outer case 100 and the back cover 130.

  Further, as shown in FIGS. 2 and 5, the magnetic flux collecting member 51 includes a magnetic flux collecting portion 511 embedded along the surface 50 </ b> A of the middle frame 5 and an inner periphery of the middle frame 5 of the magnetic flux collecting portion 511. The magnetic coupling portion 512 extends along the inner peripheral surface 50C from the end on the surface 50C side in the clockwise direction and extends along the inner peripheral surface 50C.

The magnetism collecting portion 511 is disposed so as to face the dial plate 14 in order to collect radio waves entering from the watch face side, that is, the dial plate 14 side.
Here, since the outer case 100 has a quadrangular shape in the plan view and the module 10 has a circular shape in the plan view, the gap between the module 10 and the four corners of the outer case 100 is large as shown in FIG. Thus, the plane area of the middle frame 5 is increased. Therefore, the plane area of the magnetism collecting part 511 can also be made relatively large. Specifically, the magnetism collecting portion 511 can have a substantially triangular shape with the four corners of the middle frame 5 as vertices and the side curved along the inner peripheral surface 50C of the middle frame 5 as the bottom. If so, the four corners of the large area of the middle frame 5 can be used effectively.

Further, the magnetic coupling portion 512 is disposed at a position where it can be magnetically coupled to the lead portion 211D of the antenna 21. That is, as shown in FIGS. 2 and 5, the magnetic coupling portion 512 is disposed on the inner peripheral surface 50 </ b> C of the middle frame 5 at a position close to the lead portion 211 </ b> D. Specifically, as shown in FIG. 2, the magnetic coupling portion 512 is provided so as to be curved along the inner peripheral surface 50 </ b> C of the middle frame 5. As shown in FIG. 5, the magnetic coupling portion 512 extends to the vicinity of the back surface 50 </ b> B of the middle frame 5 along the inner peripheral surface 50 </ b> C of the middle frame 5.
Here, since the arrangement of the magnetic coupling portion 512 can be freely set within the middle frame 5, the magnetic coupling portion 512 can be set at an optimum distance from the lead portion 211 </ b> D of the antenna 21.

  As described above, the magnetic flux collecting portion 511 has a larger plane area than the lead portion 211D and can collect many magnetic flux lines. The magnetic flux lines collected by the magnetism collecting part 511 flow to the lead part 211D, that is, the magnetic core 211 via the magnetic coupling part 512. Therefore, the surrounding magnetic flux lines are collected on the magnetic flux collecting member 51, and the magnetic flux density of the magnetic flux lines passing through the magnetic core 211 from the magnetic flux collecting member 51 via the lead portion 211D is also increased.

  Thus, the middle frame 5 in which the magnetic flux collecting member 51 is embedded can be manufactured by insert molding, for example.

[Effects of radio-controlled clock]
According to this embodiment, the following effects can be obtained.
In the present embodiment, a magnetism collecting member 51 is provided on the middle frame 5. Here, since the circular module 10 in the plan view is incorporated in the watch of the quadrangular outer case 100 in the plan view, the interval between the module 10 and the four corners of the outer case 100 is increased, and the inner frame 5 The plane area of becomes larger. Therefore, the size (area) of the magnetic flux collecting member 51 provided in the middle frame 5 can be made relatively large. Further, since the middle frame 5 is located between the module 10 and the outer case 100, there is no possibility of interfering with components in the module 10. Therefore, when the magnetic flux collecting member 51 is provided in the middle frame 5, there are few restrictions on the size of the magnetic flux collecting member. Therefore, if the magnetic collecting member 51 is provided in the middle frame 5, the plane area can be made relatively large, the magnetic collecting effect can be enhanced, and the antenna characteristics can be improved.

Further, the inner frame 5 is formed of a synthetic resin or the like, and can be complicatedly molded or integrally formed with the magnetism collecting member 51. Therefore, when the magnetic flux collecting member 51 is provided in the middle frame 5 as in the present embodiment, the arrangement of the magnetic flux collecting members 51 can be freely set within the middle frame 5, so that the magnetic coupling portion of the magnetic flux collecting member 51 512 can be set to an optimum distance from the lead portion 211D of the antenna 21. Even when watches having different sizes and shapes using the common module 10 are manufactured, the antenna characteristics can be improved.
Note that if the distance between the magnetic flux collecting member 51 and the lead portion 211D of the antenna 21 changes even slightly during the reception process by the receiving means, the tuning frequency of the antenna 21 fluctuates and the reception performance deteriorates. On the other hand, when the magnetic flux collecting member 51 is provided in the middle frame 5 as in the present embodiment, the distance between the magnetic flux collecting member 51 and the lead portion 211D of the antenna 21 can be fixed. The tuning frequency does not vary.
Further, in the present embodiment, when assembling the timepiece, there is no need for a step of attaching the magnetic flux collecting member 51 to the inner peripheral surface of the outer case 100, and the timepiece is easy to assemble. Further, since the magnetic flux collecting member 51 can be easily arranged between the outer case 100 and the antenna 21 without the need for new parts, the arrangement of the magnetic flux collecting member 51 increases the size of the watch or increases the thickness dimension. Can be prevented.

  Since the magnetic flux collecting member 51 is thin and has a high magnetic permeability, the timepiece can be further reduced in size and thickness by using the magnetic flux collecting member 51 as the magnetic flux collecting member. Further, by embedding the magnetic flux collecting member 51 in the middle frame 5 in this way, the magnetic flux collecting member 51 can be protected by the middle frame 5 even when an impact is applied as in the case where the radio wave correction timepiece 1 is dropped. The impact resistance can be improved.

  In the radio-controlled timepiece 1 including the metal outer case 100, the outer case 100 blocks radio waves, so that the radio waves enter the module 10 from the dial 14 side. In the present embodiment, the middle frame 5 is provided with a magnetism collecting portion 511 along the surface 50A of the middle frame 5 facing the dial 14, and a magnetic coupling portion 512 is provided along the inner peripheral surface 50C. ing. The magnetism collecting part 511 collects radio waves coming from the dial 14 side and magnetically couples it to the lead part of the antenna in the magnetic coupling part 512, thereby enhancing the magnetism collecting effect.

  In the present embodiment, the two magnetic flux collecting members 51 are provided at positions where they are magnetically coupled to the lead portions 211D at both ends of the magnetic core 211, respectively. In such a case, as compared with the case where one magnetic flux collecting member 51 is provided in the middle frame 5 and the magnetic flux collecting member 51 is arranged at a position where only one of the lead portions 211D of the magnetic core 211 is magnetically coupled. Thus, the magnetic flux collecting effect can be enhanced.

  When the magnetic flux collecting member 51 is provided on the middle frame 5 by insert molding as in the present embodiment, the assembly of the timepiece can be improved compared to the case where the magnetic flux collecting member 51 is bonded to the middle frame 5.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a schematic plan view of the radio-controlled timepiece 1A according to the second embodiment of the present invention viewed from the back cover side.
In the second embodiment, (i) the inner peripheral shape of the casing 110A of the outer case 100A is a bucket shape in the plan view, and (ii) the outer peripheral shape of the middle frame 5A is a bucket in the plan view. The shape is different from the first embodiment. For this reason, description is abbreviate | omitted about the structure same or similar to the said embodiment.

In the second embodiment, as shown in FIG. 6, the outer peripheral shape of the middle frame 5A is a bucket shape in the plan view, and the inner peripheral shape of the middle frame 5A is a circular shape in the plan view. The middle frame 5A is provided with two magnetism collecting members 51A at positions close to the lead portions 211D at both ends of the magnetic core 211 in the plan view. The magnetic flux collecting member 51A has a magnetic flux collecting portion 511A and a magnetic coupling portion 512A.
Further, as shown in FIG. 6, the magnetism collecting portion 511A of one magnetism collecting member 51A is in the middle from the position close to the lead portion 211D (10 o'clock position) to the position close to the pulse synthesizing circuit 31 (1 o'clock position). The magnetic flux collecting portion 511A of the other magnetic flux collecting member 51A extends along the surface 50A of the frame 5, and the position (5 o'clock) is close to the hour / minute motor 421 from the position close to the lead portion 211D (8 o'clock position). It extends along the surface 50A of the middle frame 5 until the hour position). Note that, when the width dimension of the magnetism collecting member 51A is narrowed, the magnetism collecting effect tends to be reduced. However, in this embodiment, since the outer peripheral shape of the middle frame 5A is a bucket shape in the plan view, for example, 6:00 It has a sufficient width dimension at the position and the 12 o'clock position. Therefore, compared with the case of said 1st embodiment, 511 A of magnetism collection parts can be extended longer.

In the second embodiment, the following effects can be obtained in addition to the same effects as the first embodiment.
In the present embodiment, since the magnetism collecting portion 511A of the magnetism collecting member 51A is extended to the 1 o'clock position and the 5 o'clock position, the plane area of the magnetism collecting portion 511A is relatively large. And since the magnetic flux collecting member 51A can collect magnetic flux lines as the plane area of the magnetic flux collecting portion 511A is larger, the reception performance can be improved.

[Third embodiment]
A third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a schematic plan view of the radio-controlled timepiece 1B according to the third embodiment of the present invention as viewed from the back cover side.
In the third embodiment, (i) the inner peripheral shape of the casing 110B of the outer case 100B is circular in the plan view, and (ii) the outer peripheral shape of the middle frame 5B is circular in the plan view. The shape is different from the first embodiment. For this reason, description is abbreviate | omitted about the structure same or similar to the said embodiment.

In the third embodiment, as shown in FIG. 7, the outer peripheral shape of the middle frame 5B is circular in the plan view, and the inner peripheral shape of the middle frame 5B is circular in the plan view. The middle frame 5B is provided with two magnetism collecting members 51B at positions close to the lead portions 211D at both ends of the magnetic core 211 in the plan view. The magnetic flux collecting member 51B has a magnetic flux collecting portion 511B and a magnetic coupling portion 512B.
Further, as shown in FIG. 7, the magnetism collecting portion 511B of one magnetism collecting member 51B is in the middle from the position close to the lead portion 211D (10 o'clock position) to the position close to the pulse synthesizing circuit 31 (1 o'clock position). The magnetic flux collecting portion 511B of the other magnetic flux collecting member 51B extends along the surface 50A of the frame 5B, and a position (5) close to the hour / minute motor 421 from a position close to the lead portion 211D (8 o'clock position). It extends along the surface 50A of the middle frame 5B until the hour position). Note that, when the width dimension of the magnetism collecting member 51B is narrowed, the magnetism collecting effect tends to decrease. However, in the present embodiment, the outer peripheral shape of the middle frame 5B is a relatively large circular shape in the plan view. For example, it has a sufficient width dimension at the 6 o'clock position and the 12 o'clock position. Therefore, compared with the case of said 1st embodiment, the magnetism collection part 511B can be extended longer.

In the third embodiment, the same effects as the first embodiment can be obtained, and the following effects can also be obtained.
In the present embodiment, since the magnetism collecting portion 511B of the magnetism collecting member 51B extends to the 1 o'clock position and the 5 o'clock position, respectively, the plane area of the magnetism collecting portion 511B of the magnetism collecting member 51B is also relatively large. Become. And since the magnetic flux collecting member 51B can collect magnetic flux lines as the plane area of the magnetic flux collecting portion 511B is larger, the reception performance can be improved.
However, compared to the first embodiment, since there are no four corners in the middle frame 5B, the plane area of the magnetism collecting portion 511B of the magnetism collecting member 51B is reduced accordingly.

[Other Embodiments]
The present invention is not limited to the above embodiment.
That is, the present invention has been illustrated and described primarily with respect to particular embodiments, but without departing from the spirit and scope of the present invention relative to the embodiments described above. Various modifications may be made by those skilled in the art in terms of shape, material, quantity, and other detailed configurations.

  For example, in the above-described embodiment, the middle frame 5 is an annular one, but is not limited thereto. For example, like the radio-controlled timepiece 1C shown in FIG. 8, the middle frame 5C includes a side-side middle frame portion 50E disposed between the outer case 100 and the module 10, and a watch back surface of the side-side middle frame portion 50E. It may have a rear side middle frame portion 50 </ b> F that extends from the side end portion toward the center and is disposed between the back cover 130 of the outer case 100 and the module 10. In such a case, as the magnetic flux collecting member 51C, the magnetic flux collecting portion 511C that extends to the back surface side middle frame portion 50F and is embedded along the surface 50A of the middle frame 5C, and the middle frame It is preferable to include a magnetic coupling portion 513C embedded along the inner peripheral surface 50C of 5C and a magnetic coupling portion 512C embedded along the rear surface side middle frame portion 50F. And in the said planar view, it is preferable to arrange | position in the position where the magnetic coupling part 512C of the magnetic flux collecting member 51C and the lead part 211D of the antenna 21 overlap. In this way, the magnetic coupling portion 512C of the magnetic flux collecting member 51C can be magnetically coupled to the lead portion 211D of the antenna 21.

  In the above embodiment, the magnetic coupling portion 512 is provided along the inner peripheral surface 50C of the middle frame 5 up to the end position (11 o'clock position) of the magnetic flux collecting portion 511, but is not limited to this. For example, the magnetic coupling portion 512 may be provided only at a position (10 o'clock position) close to the lead portion 211D.

  In the embodiment, the insert molding is employed as a method of embedding the magnetic flux collecting member 51 in the middle frame 5, but is not limited to this. For example, a method may be employed in which a concave portion or the like is provided in the middle frame 5 in advance, and a magnetic collecting member is provided in the concave portion by a method such as adhesion or printing.

  In the said embodiment, although the amorphous foil material was used as a magnetic flux collecting member, it is not limited to this. As the magnetic flux collecting member, a magnetic foil body such as a ferrite sheet may be used, or a magnetic body such as a ferrite core formed by mixing a synthetic resin with amorphous powder may be used. However, it is preferable to use a magnetic foil body such as an amorphous foil material or a ferrite sheet because the thickness dimension can be reduced and the magnetic characteristics are excellent.

  Further, the radio information received by the antenna 21 is not limited to the long wave standard radio wave including time information. For example, the antenna 21 may receive various radio signals such as a weak radio wave in the 300 MHz band, a specific low power radio in the 400 MHz band, a wireless in the 135 kHz band used for a non-contact IC card, keyless entry, and the like. When receiving these radio waves, since the frequency is higher than that of the long wave standard radio wave, the number of turns of the coil 212 may be small, and the antenna 21 can be made small.

  In addition to the wireless communication using radio waves, other wireless communication methods such as an electromagnetic coupling method and an electromagnetic induction method may be used. Note that the electromagnetic coupling and electromagnetic induction methods require communication devices to be close to each other. However, if a non-magnetic material such as stainless steel is used, it is possible to communicate through a metal part. There is an advantage that it can be made of metal.

Furthermore, radio information communicated using the antenna 21 is not limited to time information. For example, an IC card function may be built in the radio-controlled timepiece 1 and used for transmitting and receiving information such as train commuter passes and various prepaid IC cards. For example, an IC chip and an antenna may be incorporated in the case so that information can be exchanged by placing a wristwatch close to a ticket gate using a smart card, an entrance / exit management device, various billing payment machines, or the like. In this case, it is not necessary to insert and remove the IC card separately, and it is only necessary to bring the hand with the watch close to it, so that the operability can be greatly improved.
Therefore, the antenna 21 incorporated in the electronic timepiece with built-in antenna of the present invention may be used exclusively for reception as in the case of receiving a standard radio wave, or may receive information such as a tag using a non-contact IC. It may be used for transmission / reception or may be used exclusively for transmission, and these may be appropriately selected according to the type of electronic timepiece to which the present invention is applied.

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C ... Radio wave correction watch, 2 ... Receiving means, 5, 5A, 5B, 5C ... Middle frame, 10 ... Module, 21 ... Antenna, 51, 51A, 51B, 51C ... Magnetic collecting member, 100, 100A, 100B ... exterior case, 211 ... magnetic core, 211C ... coil winding part, 211D ... lead part, 212 ... coil, 511, 511A, 511B, 511C ... magnetism collecting part, 512, 512A, 512B, 512C ... magnetic coupling Department.

Claims (4)

A metal outer case,
An antenna for receiving external wireless information;
Receiving means for processing the external wireless information received by the antenna;
A module in which the antenna and the receiving means are housed;
A middle frame disposed between the outer case and the module ;
A magnetic flux collecting member provided on the middle frame and having a magnetic flux collecting portion and a magnetic coupling portion ;
The antenna includes a magnetic core and a coil wound around the magnetic core,
The magnetic core includes a coil winding portion around which the coil is wound, and lead portions extending from both ends of the coil winding portion,
The magnetic flux collecting portion is provided along the surface of the middle frame, the magnetic coupling portion is provided along an inner peripheral surface of the middle frame, and the magnetic flux collecting member is magnetically coupled to the lead portion. Electronic clock with built-in antenna. The electronic watch with a built-in antenna according to claim 1,
The electronic timepiece with a built-in antenna, wherein the magnetic flux collecting member is an amorphous foil material embedded in the inner frame. In the electronic timepiece with a built-in antenna according to claim 1 or 2 ,
The middle frame is provided with two magnetism collecting members,
The two magnetic flux collecting members are provided at positions where they are magnetically coupled to the lead portions at both ends of the magnetic core, respectively. In the electronic timepiece with a built-in antenna according to any one of claims 1 to 3 ,
The electronic timepiece with a built-in antenna, wherein the magnetism collecting member is provided on the inner frame by insert molding.

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