JP2002200461A - Vibration generator and portable device using the same - Google Patents

Abstract

(57) [Summary] [Problem] Although it is a compact and lightweight structure, two kinds of ringing signals of ringing sound and bodily sensation vibration are generated.
Provided is a vibration generating device which can be freely used and can improve magnetic efficiency. A yoke (3) includes a substrate (3a) and a substrate (3a).
A central portion 3b rising from the center of the substrate portion, an outer peripheral portion 3c rising from the periphery of the substrate portion 3a, and a leg portion 3d falling from the center of the substrate portion 3a. The magnet 4 is attached to the yoke 3 so that it has different magnetic poles on the center side and the outer peripheral side of the housing 6.
The coil 5 is attached to the second plate-like elastic body 2 so as to be located in a space formed between the magnet 4 and the central portion 4b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generator such as a pager (pager), a wristwatch type portable small information transmission device, and the like. More specifically, the present invention relates to a pager, a clock that informs a time signal and an alarm, and the like, and other portable devices having a signal receiver function of transmitting information by transmitting vibrations or sound to a human body and a vibration generation device thereof. It is.

[0002]

2. Description of the Related Art Heretofore, among devices which generate such vibrations, pagers have been typical, and the spread of pagers has been particularly high. Therefore, the following description will focus on the pager.

Conventionally, a pager generates a ringing tone when a pager internal receiver receives a radio pager signal in order to notify a carrier of a telephone call.

[0004] However, there is a problem that since the call by sound starts at any place, it inconveniences the surroundings and informs others of the necessity of contact.

[0005] As a countermeasure, a function is provided today for notifying that a call has been made by bodily sensation vibration in addition to calling by sound, and a calling signal of either a ringing sound or bodily sensation vibration can be selected.

Therefore, a description will be given of a conventionally used vibration generating apparatus for generating bodily sensations. A rotating shaft 14 protruding from the end face of the cylindrical coreless motor 12 as shown in FIG.
Eccentric weight 1 made of high specific heavy metal such as tungsten
3 is formed. This eccentric weight 13
Has a semicircular or fan shape in order to cause a partial circular motion and eccentric vibration. The coreless motor 12 is energized and the eccentric weight 13 is rotated to generate secondary vibration.

[0007]

The conventional vibration generator has the following problems with respect to miniaturization of portable equipment such as a pager. (1) In the configuration in which the eccentric weight 13 is attached to the cylindrical coreless motor 12, a large load acts on the rotating shaft 14 due to the centrifugal force, so that it is not possible to sufficiently meet the demand for further downsizing or long-term use. (2) In the conventional configuration, in order to be able to select either the ringing sound or the bodily sensation vibration, a small speaker for generating a sound is separately required, and the small speaker and the vibration generator are separately provided. It is built-in, and is an obstacle to space saving in miniaturization.

The present invention solves such a problem and is advantageous in terms of magnetic efficiency and compactness. In addition, a vibration generating apparatus which enables a single vibration generating apparatus to make a call with a ringing tone and a call with a bodily sensational vibration. And a portable device using the same.

[0009]

In order to achieve the above-mentioned object, a vibration generating apparatus according to the present invention has a pair of plate-like elastic members arranged inside a housing so as to face each other. A first vibrator is configured by attaching a magnetic field generator including a yoke and a magnet to the body, and a second vibrator is configured by attaching a coil to the other plate-like elastic body. A central portion rising from the center of the substrate toward the second vibrator, an outer peripheral portion rising from the periphery of the substrate toward the second vibrator, and a leg falling from the center of the substrate. At the same time, the leg is attached to the plate-like elastic body of the first vibrating body, and the magnet is fixed to the inner surface of the outer peripheral portion of the yoke so as to have different magnetic poles on the center side and the outer peripheral side of the housing, The coil is located in a space formed between the magnet and a central portion of the yoke. Characterized by position.

In the above invention, it is preferable that the yoke has a polygonal shape in a plan view, the side surfaces constituting the outer peripheral portion of the yoke are separated from each other, and a plate-like magnet is fixed to the inner surface of each side surface. It is.

In addition, it is preferable that the vibration generator of the present invention be incorporated in a portable device such as a pager.

The operation of the vibration generator according to the present invention will be described by taking as an example a case where the resonance frequency of the first vibrator is set low and the resonance frequency of the second vibrator is set high.

When a current having a frequency that causes one of the first vibrating body and the second vibrating body to resonate is supplied to the coil of the second vibrating body through the oscillating circuit, the magnetic field generating body of the first vibrating body, Both vibrating systems vibrate due to the mutual magnetic action with the coil disposed in the magnetic field, and one of the vibrating systems resonates. Therefore, the amplitude is overwhelmingly large. If the value is the second
Vibrator resonates to generate a ringing tone. Further, the frequency of the current is switched through the oscillation circuit to cause the other vibration system to resonate.
When the predetermined value is equal to or lower than Hz, the first vibrating body resonates and can generate a bodily sensation vibration.

Here, the reason why the resonance frequency of the first vibrating body is lowered and the resonance frequency of the second vibrating body is raised is that most of the mass of the vibration generating device is generated by the magnetic field generating body of the first vibrating body. Therefore, the mass of the first vibrating body is considerably larger than the mass of the second vibrating body, and the resonance frequency of the first vibrating body is considerably lower than the resonance frequency of the second vibrating body. Because it becomes.

Further, in the present invention, the yoke is constituted of a substrate portion, a central portion, an outer peripheral portion, and a leg portion, and the inner peripheral surface of the yoke has different magnetic poles on the central side and the outer peripheral side of the housing. By fixing the magnet and positioning the coil in the space formed between this magnet and the center of the yoke,
Since the magnetic flux leakage from this space can be reduced, the magnetic efficiency can be improved and the size can be reduced, and the yoke is attached to the plate-like elastic body with its outer peripheral part floating. The outer periphery of the yoke does not come into contact with the plate-like elastic body, and its vibration is not hindered.

In the present invention, if the yoke is formed in a polygonal shape in plan view, the side surfaces constituting the outer peripheral portion of the yoke are separated from each other, and a plate-like magnet is fixed to the inner surface of each side surface, a circle is obtained. Compared to using a ring magnet, etc.
The productivity and cost reduction of magnets can be improved, and the substrate and outer periphery of the yoke can be manufactured by punching sheet metal, etc., further improving productivity and reducing costs, and furthermore, the side portions can be independently formed. As a result, vibration due to the mutual magnetic action is further amplified, and a sufficiently large vibration can be generated even with low energy.

[0017]

1 to 3 show an embodiment of the present invention.
This will be described with reference to FIG.

The vibration generator according to the present invention comprises a housing 6, a pair of first and second plate-like elastic members 1 and 2 supported by the housing 6, The magnetic field generator (comprising the yoke 3 and the plate-like magnet 4) 7 attached to the first plate-like elastic body 1 and the square tube coil 5 attached to the second plate-like elastic body 2 That is, the first plate-like elastic body 1 and the magnetic field generator 7 constitute a first vibrator, and the second plate-like elastic body 2 and the rectangular coil 5 constitute a second vibrator.

The housing 6 comprises an upper cylindrical body 6a and a lower cylindrical body 6b. The upper cylindrical body 6a has an annular stepped portion 6e for fitting and supporting the second plate-shaped elastic body 2 at its upper end.
The outer peripheral surface has a resonance hole 6c for a ringing sound resonance effect, and a lower end thereof has a pair of opposed concave portions 6d for fitting the projections 1a of the first plate-shaped elastic body 1. Is provided. The lower cylindrical body 6b has a bottomed cylindrical shape that is shorter than the upper cylindrical body 6a. The upper surface of the lower cylindrical body 6b and the recess 6d of the upper cylindrical body 6a have a first plate-like elasticity. The projection 1a of the body 1 is clamped. By providing the lower cylindrical body 6b, it is possible to support the first plate-like elastic body 1 and to prevent the first plate-like elastic body 1 from contacting another obstacle and obstructing its vibration. Can be. Here, it is preferable that the upper cylindrical body 6a and the lower cylindrical body 6b are made of resin or metal.

The first plate-like elastic body 1 located on the lower side of the housing 6 is made of a metal plate such as a steel plate, and has an "S" -shaped shape. Second spring constant of 1
Of the plate-like elastic body 2 was smaller. this is,
In the vibration generating device of the present invention, the effect can be sufficiently obtained even if the first plate-like elastic body 1 and the second plate-like elastic body 2 have exactly the same shape.
The first vibrator can obtain a lower resonance frequency,
This is for further clarifying the difference between the resonance frequencies of the first vibrating body and the second vibrating body.

At the center of the first plate-like elastic body 1, a projection 3 e of a yoke 3 described later is fitted, and a mounting hole 1 b for mounting the yoke 3 is provided. As described above, the outer periphery is provided with a pair of projections 1a that are fitted into the recesses 6d of the upper cylindrical body 6a so as to face each other. Therefore, the first plate-like elastic body 1 is supported by the housing 6 by the pair of projections 1a, and this support structure makes the first plate-like elastic body 1 easily vibrate, and also makes And the productivity can be improved. Also,
The second plate-like elastic body 2 located on the upper side of the housing 6 has a disk shape made of a metal plate such as a steel plate, and has a larger spring constant than the first plate-like elastic body 1. By setting, the resonance frequency of the second vibrating body increases, contrary to the above-described first vibrating body. The second plate-shaped elastic body 2 is supported by the housing 6 at the peripheral edge thereof.

As described above, the first plate-like elastic body 1 and the second plate-like elastic body 2 are arranged so as to face each other in parallel at the upper and lower portions of the housing 6.

Further, the magnetic field generator 7 includes the yoke 3 and the plate-like magnet 4 and is provided at the center of the upper surface of the first plate-like elastic body 1. The yoke 3 has a square plate-shaped base (substrate) 3a, an outer peripheral portion 3c projecting upward from each of four sides of the base 3a, and a square projecting upward from the center of the base 3a. And a columnar leg 3d projecting downward from the center of the base 3a, and a projection 3e is provided on the lower surface of the center of the leg 3d.

The yoke 3 can be attached to the first plate-like elastic body 1 by fitting the projection 3e of the yoke 3 into the attachment hole 1b of the first plate-like elastic body 1.
The fitting between the b and the projection 3e facilitates the positioning when the yoke 3 is attached, thereby improving the productivity.

Further, since the yoke 3 is provided with the leg 3d and the outer peripheral portion 3c of the yoke 3 is in a floating state, the yoke 3 does not directly contact the first plate-like elastic body 1. The vibration of the outer peripheral portion 3c is not hindered.

The four side portions of the outer peripheral portion 3c are connected to the base portion 3a at the lower ends thereof, but the four side portions themselves are cut off, and each side portion interferes with another adjacent side portion. Vibration can be performed independently without generating a larger vibration. Further, by forming the outer peripheral portion 3c with such four side surface portions, the base portion 3a and the outer peripheral portion 3c can be formed at the same time only by bending the four sides of the metal plate cut into a cruciform shape, and together with the above-described effects. Thus, productivity can be improved and costs can be reduced.

The plate-like magnets 4 are fixed one by one to the inner surface of each side surface of the outer peripheral portion 3c, and a magnetic field generator 7 is formed. Is in contact with the inner surface of the outer peripheral portion 3c, and the S pole side is provided at a constant interval toward the outer peripheral side of the central portion 3b. Also, the lower end of the plate-shaped magnet 4 does not contact the base 3a,
It is fixed to the outer peripheral portion 3c while maintaining a certain gap. The yoke 3 is made of a soft magnetic material such as pure iron.
Is preferably made of, for example, a rare earth magnet material.

By configuring the magnetic field generator 7 in this manner, compared with the configuration in which the magnet is arranged at the center of the yoke, the leakage magnetic flux is reduced, and the rectangular cylinder coil 5 described later is formed into a short coil type. This is advantageous in terms of magnetic efficiency and compactness, and since the outer peripheral portion 3c of the yoke 3 has a square shape, the plate-shaped magnet 4 can be used as a magnet. Productivity can be improved and cost can be reduced as compared with the case where a magnetic field generator is configured.

In the present embodiment, the shape of the yoke 3 in a plan view is square, but the same effect can be obtained by using a polygon such as a triangle or a hexagon. Further, in the present embodiment, the side surfaces of the outer peripheral portion 3c are separated from each other. However, the side surfaces may be integrally and continuously formed.

Further, the rectangular tube coil 5 is formed in a substantially square shape using an enameled wire obtained by baking a resin on the surface of a copper wire, and the inner peripheral side of the plate-shaped magnet 4 and the outer peripheral portion of the central portion 3b of the yoke 3 are formed. And a central portion on the lower surface of the second plate-like elastic body 2 so that it can be arranged at a place where the magnetic flux density in the magnetic field of the magnetic field generator 7 composed of the yoke 3 and the plate-like magnet 4 is high. It protrudes downward from.

FIG. 3 shows an oscillation circuit 15
1 shows an example of a configuration in which currents having different frequencies are switchably provided. In FIG. 3, 5 is a rectangular cylinder coil, 1
Reference numeral 1 denotes a DC power supply, and 15 denotes an oscillation circuit including the CPU 10, the transistor 9, the resistors 8a and 8b, and the like.

The CPU 10 supplies a pulse signal to the transistor 9 which repeats energization and energization stop, and a current having the same frequency as that of the pulse signal flows through the rectangular cylinder coil 5. When the rectangular tube coil 5 is energized in this way, the plate-shaped magnet 4
, And the rectangular coil 5 vibrate by the electromagnetic force, and as a result, the first vibrator and the second vibrator vibrate. The CPU 10 is configured so that the frequency of the pulse signal can be selected from any of a first frequency at which the first vibrator resonates and a second frequency at which the second vibrator resonates.

When the CPU 10 applies a pulse signal of the first frequency to the transistor 9 to cause the vibration generator to vibrate at, for example, 100 Hz in accordance with the resonance frequency of the first vibrator, the first plate-like elastic body 1 The device itself resonates in synchronism with the resonance frequency through the above, and generates a bodily vibration. As a result, it is possible to make a call that is silent and does not bother others.

On the other hand, the CPU 10 supplies a pulse signal of the second frequency to the transistor 9 so that the vibration generating device is set to, for example, 2.7 in accordance with the resonance frequency of the second vibrator.
When vibrated at kHz, the device itself resonates in synchronization with the resonance frequency, generates a ringing tone, and acts as a speaker.

Here, the resonance frequency of the first vibrating body is
Is lower than the resonance frequency of the vibrating body, the spring constant of the first plate-like elastic body 1 constituting the first vibrating body is small,
And a magnetic field generator 7 occupying most of the mass of the vibration generator.
This is because the mass of the first vibrating body is large because the first vibrating body belongs to the first vibrating body.

On the contrary, the reason why the resonance frequency of the second vibrating body is relatively high is that the second plate-like elastic body 2 constituting the second vibrating body has a relatively high resonance frequency.
This is because the second vibrator has a large spring constant, and the second vibrator has only a small mass of the rectangular cylinder coil 5 and the second vibrator, so that the second vibrator has a low mass.

In the present embodiment, in particular, since the resonance hole 6c is provided in the housing 6, the ringing sound generated by the resonance of the second plate-like elastic body 2 is further reduced by the resonance effect. It can be made loud and sufficient ringing sound can be obtained with low energy.

In the present embodiment, the sectional area of the resonance hole 6c is set to 0.1 based on the following Helmholtz theoretical formula and experimental results.
４4 mm ² was appropriate.

In Helmholtz's theoretical formula, the frequency f is: S: sectional area of the resonance hole 6c, V: volume of the housing 6,
L: distance from the outer peripheral surface of the housing 6 to the inner peripheral surface of the resonance hole 6c;
c: expressed as S = V * L * (2πf) ² / c ² as the sound speed of air.

It is preferable to set the resonance frequency of each vibration system so that the frequency of the bodily sensation vibration of the first vibrating body is 250 Hz or less and the frequency of the ringing tone is 600 Hz or more in the second vibrating body. . The reason why the frequency is set to 600 Hz or more is that ISO 226 (196)
This is because, based on the equal loudness curve of 1), if the vibration is performed at 600 Hz or more, the sound can be heard by a human ear at a low sound pressure level. That is, a sound that can be heard by the human ear can be generated with low vibration energy. 250 Hz
The following is also based on the equal loudness curve,
This is because vibrations of 0 Hz or less cannot be heard by human ears, and only mechanical vibrations can be transmitted to the body.

As described above, two types of call signals can be generated by one vibration generator, so that a smaller, lighter, and larger vibration generator can be provided as compared with the above-described conventional example. .

The above-described vibration generator can be used by being incorporated in a portable device such as a pager or a wristwatch. Then, for example, it is possible to configure so that a person who carries the pager can select one of the ringing sound and the bodily sensation by using a changeover switch. Further, a pulse signal of the first frequency and a pulse signal of the second frequency from the CPU 10 may be alternately generated at regular time intervals, so that both the ringing sound and the bodily sensation may be alternately generated. .

[0043]

The vibration generator according to the present invention is compact,
In spite of its light weight structure, it is possible to freely generate two types of calling signals, a ringing sound and a bodily sensation vibration, and to improve the magnetic efficiency.

The yoke of the magnetic field generator of the first vibrating body has a polygonal shape in a plan view, the side surfaces constituting the outer peripheral portion of the yoke are separated from each other, and a plate-shaped magnet is formed on the inner surface of each side surface. By fixing, the productivity and cost of the vibration generator can be improved and a sufficiently large vibration can be generated even with low energy.

When the vibration generator of the present invention is incorporated in a portable device such as a pager or a wristwatch, the portable device provided with the above two types of call signals can be made compact and lightweight.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of a vibration generator according to the present invention.

FIG. 2 is an exploded sectional perspective view thereof.

FIG. 3 is a schematic diagram showing the oscillation circuit.

FIG. 4 is a perspective view showing a conventional pager vibration generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st plate-shaped elastic body 2 2nd plate-shaped elastic body 3 Yoke 3a Base part (substrate part) 3b Central part 3c Outer part 3d Leg part 4 Plate magnet (magnet) 5 Square cylinder coil (coil) 6 Case Body 7 Magnetic field generator

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04R 9/02 102 H04R 9/02 102A 9/10 9/10 (72) Inventor Masaru Nagaike Kadoma, Osaka 1006 Ojimon Shin Matsushita Electric Industrial Co., Ltd. (72) Inventor Shinichiro Inukai 4-3-1 Tsunashimahigashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture F-term in Matsushita Communication Industrial Co., Ltd. 5D012 BA03 BB03 BB04 CA02 DA04 FA05 GA04 5D016 AA01 FA02 5D017 AA11 5D107 AA03 AA13 BB08 CC08 FF08 5H633 BB02 GG06 GG09 HH02 HH07 JB09

Claims (3)

[Claims] 1. A first vibrating body in which a pair of plate-like elastic bodies are arranged inside a housing so as to face each other, and a magnetic field generator including a yoke and a magnet is attached to one of the plate-like elastic bodies. A coil is attached to the other plate-like elastic body to form a second vibrator, and the yoke includes a substrate portion, and a central portion rising from the center of the substrate portion toward the second vibrator. An outer peripheral portion rising from the periphery of the substrate portion toward the second vibrating body, and a leg portion falling from the center of the substrate portion, and attached to the plate-like elastic body of the first vibrating body at the leg portion. The magnet is fixed to the inner surface of the outer peripheral portion of the yoke so as to have different magnetic poles on the center side and the outer peripheral side of the housing, and the coil is formed between the magnet and the central portion of the yoke. A vibration generator characterized by being located inside. 2. The yoke has a polygonal shape in a plan view, the side surfaces constituting an outer peripheral portion of the yoke are separated from each other, and a plate-like magnet is fixed to an inner surface of each side surface. 2. The vibration generator according to 1. 3. A portable device incorporating the vibration generator according to claim 1.