JP2003145048A - Bone conduction vibrating actuator and portable electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively achieve a voice speaker and a bone conduction actuator by using one actuator, to provide a bone conduction vibrating actuator which enables a vibration mode output of bodily sensing vibration on the occasion of the incoming call of a telephone, etc., or an alarm for an emergency, and to provide a portable electronic apparatus using the same. SOLUTION: The vibrating actuator 11 is provided with a drive part 10, and is mounted in the casing 21 of a portable communication terminal device, etc., as a sound source. The drive part 10 is provided with a piezoelectric body 1 to convert an electric signal into vibration, a fixing member for integrating an almost central part of a piezoelectric body 1 with the casing 21, a ring- shaped elastic body 2 firmly fixed to the outer peripheral part of the piezoelectric body 1, and a weight 3 to be firmly fixed to the elastic body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bone conduction actuator, and more particularly, to a mobile communication terminal such as a mobile phone or a handset capable of making a call without a cord by an indoor radio, and a portable electronic device, a hearing aid, a radio, a headphone. For earphones, earphones, etc., an actuator that can output a bone conduction function useful for the hearing impaired and the visually impaired is used, and this is attached to the housing to utilize the housing resonance frequency and to improve the sound pressure at low frequencies. The present invention relates to a bone conduction vibration actuator that can obtain a flat frequency characteristic in a voice band by a structure that enables a weight to be added.

[0002]

2. Description of the Related Art Conventionally, as a vibration generating device for incoming signals and voice signals of a mobile phone or the like, a device using a bone conduction type earphone or an ear speaker connected by a wire from the mobile phone has been reported. In addition, as a method of converting an incoming signal and a voice signal into vibration, there are electromagnetic and piezoelectric bioconduction actuators.

[0003]

In the above-mentioned conventional bioconducting actuator, since the efficiency of converting an electric signal into sound pressure which is vibration of air is low, the loud speaker cannot be used because of its low volume.

For this reason, for example, in a telephone used by a hearing-impaired person and a healthy person, both a bone conduction actuator and a speaker receiver must be mounted, which is expensive.

Therefore, a technical problem of the present invention is to inexpensively realize a voice speaker and a bone conduction actuator by one actuator, and moreover, to vibrate the vibration of body sensation when a telephone or the like receives an incoming call or an alarm is issued in an emergency. It is an object of the present invention to provide a bone conduction vibration actuator capable of mode output and a portable electronic device using the same.

[0006]

SUMMARY OF THE INVENTION In order to solve these problems, the present invention uses a piezoelectric body for a driving portion, and a piezoelectric member, a ring-shaped elastic body on an outer peripheral portion, and a weight are used as an adhesive member. The drive unit is configured by integrating the piezoelectric body and the casing with the fixing member, and the first resonance frequency of the drive unit can be reduced, and an incoming call can be received. It can be set in the vibration mode (around 200 Hz), and in the frequency range of the speaker mode of 0.3 KHz to 3.4 KHz, the case is used as a vibration generating diaphragm and a bone conduction transmitting section, and the case is used. The resonance frequency (second resonance frequency) is set in the audio frequency range, and the resonance frequency of the piezoelectric element itself (third resonance frequency) is set to a frequency higher than the housing resonance frequency, whereby a flat frequency characteristic is obtained. It is intended that allow for.

That is, according to the present invention, in the vibration actuator equipped with a drive unit and mounted as a sound source in a casing of a mobile communication terminal or the like, the drive unit includes a piezoelectric body for converting an electric signal into a vibration, A fixing member that integrally integrates the substantially central portion of the piezoelectric body and the housing, a ring-shaped elastic body that is fixed to the outer peripheral portion of the piezoelectric body, and a weight that is fixed to the elastic body are provided. A bone conduction vibration actuator characterized by the above is obtained.

Further, according to the present invention, the casing functions as a vibration generating diaphragm for generating vibration and a bone conduction transmitting portion for transmitting the vibration to a bone portion of a human body. A bone conduction vibration actuator is obtained.

Further, according to the present invention, the piezoelectric body is composed of any one of a monomorph, a bimorph and a multimorph having a through hole for integrating with the casing in a central portion. The bone conduction vibration actuator described above is obtained.

Further, according to the present invention, the bone conduction vibration actuator described above is obtained in which the elastic body is a rubber-based elastic body.

According to the invention, the fixing member is
The bone conduction vibration actuator described above is obtained, in which a washer having an optimum diameter is used so that a stress is maximized in a substantially central portion where the stress is maximized.

According to the present invention, the bone conduction vibration actuator according to claim 1 is characterized in that the weight has a shape and weight for determining the first resonance frequency of the drive section. To be

Further, according to the present invention, the first portion of the driving unit is
The resonant frequency is 100 Hz to 400 Hz, and the bone conduction vibration actuator described above is obtained.

Further, according to the present invention, a magnetic circuit formed by using a permanent magnet, a coil arranged in a gap of the magnetic circuit, a vibrating body to which the coil is fixed and which vibrates, and a vibration are transmitted. And a flexible spring suspension fixed to the vibration transmitting unit, the suspension flexibly supporting the magnetic circuit, and a vibration output, a casing vibration volume output, and a bone. A bone conduction vibration actuator is obtained, which is capable of outputting a conductive sound volume, and further is configured such that the coil is capable of outputting an air vibration sound generated by vibration of the vibrating body.

Further, according to the present invention, in a portable electronic device in which a bone conduction vibration actuator is mounted as a sound source and a vibration source in a casing of a portable electronic device, a mobile communication terminal or the like, the bone vibration actuator is A piezoelectric body, a weight is fixed to the piezoelectric body via an elastic body, a resonance frequency between the weight and the elastic body is a first resonance frequency, and the casing is a vibration and bone conduction transmitting portion. It is used as a diaphragm of a sound source generator, and its resonance frequency, which is a housing resonance frequency, is used as a second resonance frequency in a voice band or an audible frequency, and the bone conduction vibration actuator uses a piezoelectric body. The resonance frequency is the third resonance frequency, and the third
The portable electronic device is characterized in that the resonance frequency is set to a higher frequency band than the second resonance frequency, and the first resonance frequency is set to a lower frequency band than the second resonance frequency.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a housing in which a vibration actuator according to a first embodiment of the present invention is mounted. FIG. 2 is a sectional view taken along the line II-II of the actuator mounting housing of FIG. FIG. 3 is a sectional view taken along line III-III of the actuator mounting housing of FIG. Further, FIG.
FIG. 3 is an enlarged view of the actuator mounting part of FIG.

Referring to FIGS. 1 to 4, the vibration actuator 11 as a driving unit 10 has a piezoelectric member 1 for converting an electric signal into vibration and a substantially central portion of a casing 21 integrated with a fixing member. It is a composition. The piezoelectric body 1 has a disc-like shape and has a hole 1a penetrating substantially in the center thereof, and uses a monomorph, bimorph, or multimorph structure. The ring-shaped elastic body 2 is fixed to the outer peripheral portion of the piezoelectric body 1 with a double-sided tape or an adhesive.

The weight 3 is fixed to the other side of the elastic body 2 in the same manner to form the drive unit 10. The through hole 1a in the central portion of the piezoelectric body 1 used for the drive unit 10 and the hole in the central portion of the housing 21 are fixed using screws 5 or the like. The vibration mode of the piezoelectric body 1 is a portion where the stress is maximum because the central portion is fixed, and the washer 4 having the optimum diameter for forming a perfect node.
And fix with screws 5.

The weight 3 constituting the drive unit 10 is composed of the drive unit 1
The shape and weight are selected to determine the first resonant frequency of the. The first resonance frequency of the drive unit 10 is used for transmitting the incoming signal to the housing 21, and the frequency recognized as the incoming signal is optimally 100 Hz to 400 Hz. The deciding factor of the first resonance frequency of the drive unit 10 is not only the piezoelectric body 1, the elastic body 2 and the weight 3 but also the casing 21 as a deciding factor. The frequency band of the audio signal is 3 KHz to 3.4 KH.
Since it is z, it is necessary to set the resonance frequency of the casing 21 used as the diaphragm at, for example, 500 Hz or higher.

The piezoelectric body 1 is used for the driving unit 10,
Of the casing 21 and the substantially central portion of the housing 21 are integrated by a fixing member, and the ring-shaped elastic body 2 is fixed to the outer peripheral portion of the piezoelectric body 1 by a double-sided tape or an adhesive, and the other side of the elastic body 2 is overlapped. With the method in which the weight 3 is fixed by the same method, the vibration actuator 11 for a mobile phone or the like is made possible. As a result, the conventional piezoelectric vibration actuator tends to have a large outer shape, and since it is necessary to control the resonance frequency of the piezoelectric body, the number of manufacturing steps is increased, and it is difficult to reduce the manufacturing cost. It is also not in conventional products,
Bone conduction function was added. Depending on the size, shape and material of the telephone case, the anti-resonance frequency of the case itself may occur and interfere with the broadband frequency characteristic. In such a case, a piezoelectric actuator unit that is not affected by the anti-resonance of the housing can be formed by additionally mounting the piezoelectric speaker element and driving it in parallel with the piezoelectric body 1.

The shape of the portion of the casing 21 that constitutes the diaphragm may be an ellipse, an ellipse, a rectangle, or the like other than the above-mentioned circle, and these can be used appropriately.

Further, the vibration actuator 1 can be used in a mobile phone or the like.
1 is mounted, for example, to withstand a drop impact from 1.8 m, and to prevent the piezoelectric element from being cracked or damaged, to prevent the weight from moving excessively around and above and below the vibration actuator, to protect it. A stopper should be provided. The stopper may be added as a case of the vibration actuator, or a rib or the like may be provided on the housing side of the mobile phone to serve as the stopper.

FIG. 5 is a plan view of a vibration actuator according to a second embodiment of the present invention.

FIG. 6 is a front sectional view of the actuator shown in FIG. FIG. 7 is a bottom view of the actuator shown in FIG. Further, FIG. 8 is a sectional view taken along the line VIII-VIII of FIG.

Referring to FIGS. 5 to 8, the vibration actuator 12 uses the piezoelectric body 1 for converting an electric signal into vibration as the driving unit 10, and the piezoelectric body 1 has a substantially central portion and a housing 2.
The configuration is such that almost the central portion of 2 is integrated by a fixing member.
The piezoelectric body 1 has a disc-like shape and has a hole 1a penetrating substantially in the center thereof, and uses a monomorph, bimorph, or multimorph structure. The ring-shaped elastic body 2 is fixed to the outer peripheral portion of the piezoelectric body 1 with a double-sided tape or an adhesive. The weight 3 is fixed to the other side of the elastic body 2 in the same manner to form the drive unit 10.

The through hole 1a in the central portion of the piezoelectric body 1 used for the drive unit 10 and the hole in the central portion of the housing 22 are fixed with screws 5 or the like. The vibration mode of the piezoelectric body 1 is a part where the stress is maximum because the central part is fixed, and a washer 4 having an optimum diameter for forming a complete node is used and fixed with screws 5.

The weight 3 constituting the drive unit 10 is composed of the drive unit 1
The shape and weight are chosen to determine a first resonance frequency of zero. The first resonance frequency of the drive unit 10 is used to transmit the incoming signal to the housing 21, and the frequency band recognized as the incoming signal is optimally 100 Hz to 400 Hz.
The determinant of the first resonance frequency of the drive unit 10 is not only the piezoelectric body 1, the elastic body 2 and the weight 3 but also the housing 22 as a determinant. The frequency band of the audio signal is 3 KHz to 3.4 K.
Since the frequency is Hz, it is necessary to set the resonance frequency of the housing 21 used as the diaphragm at, for example, 500 Hz or higher.

As shown in FIGS. 7 and 8, the vibration actuator 12 includes a voice input section 30, which includes a microphone 31 and a substrate 34, and the housing 2
2 is installed adjacent to the drive unit 10 in the microphone 3
Anti-vibration agent 32 on the surroundings of 1 and the upper surface other than the voice intake
Are bonded with an elastic adhesive. The bottom of the microphone 31 is connected to the substrate 34 and is housed in the housing 22 via the support member 33. A gap is provided in a portion of the voice input unit 30 that contacts the living body of the housing 22. The gap is provided to avoid mechanical interference with the vibration actuator 12 due to bending of the wrist of the operator. The reference numeral 35 indicates the edge of the outer cover. Further, as shown in FIGS. 5 and 6, the vibration actuator is attached to the living body by four wires 24.

The piezoelectric body 1 is used for the driving unit 10, and the piezoelectric body 1 is used.
Of the elastic body 2 is fixed to the outer peripheral portion of the piezoelectric body 1 by a double-sided tape or an adhesive, and the other central portion of the elastic body 2 is fixed to the other side of the elastic body 2. A vibration actuator 12 for a mobile phone or the like is made possible by a method in which the weight 3 is fixed in the same manner. As a result, the conventional piezoelectric type vibration actuator 12 tends to have a large outer diameter, and it is necessary to control the resonance frequency of the piezoelectric body, which increases the number of manufacturing steps and makes it difficult to reduce the manufacturing cost. It was resolved.

Depending on the size, shape, and material of the telephone case, an anti-resonant frequency of the case itself may occur and interfere with the broadband frequency characteristic. In such a case, by additionally mounting a piezoelectric speaker element and driving them in parallel, it is possible to form a piezoelectric actuator unit that is not affected by the anti-resonance of the housing.

In addition to the round shape, the shape of the portion of the casing 22 constituting the diaphragm may be an ellipse, an ellipse, a rectangle, or the like.

Further, the vibration actuator 1 can be used in a mobile phone or the like.
2 is mounted, for example, to protect against falling impact from 1.8 m, and to prevent the piezoelectric element from being cracked or damaged, the weight should not move too much around and above and below the vibration actuator. A stopper should be provided. The stopper may be added as a case of the vibration actuator, or a rib or the like may be provided on the housing side of the mobile phone to serve as the stopper.

Next, the third embodiment of the present invention will be described in detail.

FIG. 9 is a sectional view of a vibration actuator according to a third embodiment of the present invention.

As shown in FIG. 9, the vibration actuator 5
0 is the yoke 5 so as to sandwich the disk-shaped permanent magnet 51.
A magnetic circuit is formed by 2 and the plate 53, and has an inner magnet type structure. Central shaft 54 in the shape of a bolt or pin
Fits through the central hole of the magnetic circuit and positions the yoke 52, the permanent magnet 51, and the plate 53 coaxially. The suspension 55 is a single arc-shaped spiral leaf spring that flexibly supports the magnetic circuit, and is fixed to the outer periphery of the yoke 52 by an adhesive, an adhesive, an elastic material such as resin, or caulking. The other end is fixed to the vibration transmitting portion 56. On the other hand, the coil 57 is fixed to a diaphragm 59 having a diaphragm coil fixing portion 58, and if necessary, is fixed with an adhesive or the like, and is arranged in the gap of the magnetic circuit.

FIG. 10 shows the sound pressure of the vibration actuator shown in FIG.
-A diagram showing frequency output characteristics. With the configuration as shown in FIG. 9, the electrodynamic vibration actuator according to the third embodiment of the present invention can output a sensible vibration such as a vibration mode by vibrating the magnetic circuit by the suspension.

In the audio frequency band, the coil and the vibrating body vibrate, and the sound pressure function as a speaker is output by the air vibration generated from the coil and the vibrating body (see FIG. 10). Furthermore, in the voice frequency band, not only the vibrating body but also the magnetic circuit vibrates to vibrate the casing of the portable device, and the casing of the living body
For example, by contacting the head, face, etc., the sound vibration is directly transmitted to the inner ear by bone conduction, and the vibration is transmitted to the cochlea, so that voice and music can be recognized.

By mounting the vibration actuator having the bone conduction function and the speaker function in this manner, a telephone, a radio, a portable stereo, a hearing aid, which is useful for the hearing impaired,
Headphones, earphones, etc. are possible. Further, it may be a multi-function device that is a combination of a mobile phone and a hearing aid, or a mobile radio and a hearing aid.

The device equipped with these bone conduction vibration actuators is also useful for the visually impaired. In other words, for the visually impaired, hearing is very important for obtaining information from the outside, but blocking the ears with headphones or the like makes it difficult to obtain the outside information, which is dangerous.

For example, recently, a test service using FM radio has been conducted in the city for information transmission for visually impaired people, but radio reception using headphones, earphones, etc. is dangerous because of the above reasons. Bone conduction, which does not block the ears, is drawing attention as the third ear.

Even in the case of using a normal mobile phone for a normal person, the bone conduction function of the vibration actuator is useful in a place where ambient noise is severe.

Further, when the bone conduction vibration actuator is used for the headphones, the speaker function is used for both ears and the bone conduction function part is used for the forehead part, thereby having a front localization function and providing a stereoscopic effect. It is possible to recognize the sound spread with a sense of realism.

[0044]

As described above, according to the present invention, the casing is formed by using the piezoelectric body for the driving portion, connecting the casing at substantially the center, and joining the weight to the outer peripheral portion using the elastic body as the interlayer material. With the realization of the body vibration piezoelectric actuator,
The defect of the conventional piezoelectric speaker can be compensated, the outer diameter can be reduced, the manufacturing cost can be reduced, and the bone conduction function can be further provided.

Further, according to the present invention, it is possible to realize an electrodynamic vibration actuator having both a bone conduction function and an air vibration speaker function.

[Brief description of drawings]

FIG. 1 is a front view of a housing in which a vibration actuator according to a first embodiment of the present invention is mounted.

FIG. 2 is a sectional view taken along line II-II of the actuator mounting housing of FIG.

FIG. 3 is a III-II of the actuator mounting housing of FIG.
It is an I line sectional view.

4 is an enlarged cross-sectional view of the actuator mounting portion of FIG.

FIG. 5 is a plan view of a vibration actuator according to a second embodiment of the present invention.

6 is a front sectional view of the actuator of FIG.

7 is a bottom view of the actuator of FIG.

8 is a cross-sectional view taken along the line VIII-VIII of FIG.

FIG. 9 is a sectional view of a vibration actuator according to a third embodiment of the present invention.

FIG. 10 is a diagram showing sound pressure-frequency output characteristics of the vibration actuator of FIG.

[Explanation of symbols]

1 Piezoelectric body 1a hole 2 elastic body 3 weights 4 washers 5 screws 10 Drive 11,12 Vibration actuator 21,22 housing 24 wires 30 voice input section 31 microphone 32 Anti-vibration agent 33 Support member 34 substrate 50 Vibration actuator 51 permanent magnet 52 York 53 plates 54 central axis 55 suspension 56 Vibration transmitter 57 coils 58 Vibration plate coil fixing part 59 diaphragm

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04M 1/02 H04M 1/02 C 1/03 1/03 C

Claims (9)

[Claims] 1. A vibration actuator comprising a drive unit and mounted as a sound source in a casing of a mobile communication terminal or the like,
The driving unit includes a piezoelectric body that converts an electric signal into vibration, a fixing member that integrates the substantially central portion of the piezoelectric body and the housing, and a ring-shaped elastic body that is fixed to an outer peripheral portion of the piezoelectric body. And a weight fixed to the elastic body, the bone conduction vibration actuator. 2. The bone conduction vibration actuator according to claim 1, wherein the casing functions as a vibration generating diaphragm for generating vibration and a bone conduction transmitting portion for transmitting the vibration to a bone portion of a human body. . 3. The piezoelectric body is a monomorph, a bimorph, having a through hole for integration with the casing in a central portion.
2. The bone conduction vibration actuator according to claim 1, wherein the bone conduction vibration actuator is formed of any one of a multimorph and a multimorph. 4. The bone conduction vibration actuator according to claim 1, wherein the elastic body is a rubber-based elastic body. 5. The washer having the optimum diameter, which is a portion where the central portion is fixed and the stress is maximized, is used as the fixing member. The bone conduction vibration actuator described. 6. The bone conduction vibration actuator according to claim 1, wherein the weight has a shape and a weight for determining the first resonance frequency of the driving unit. 7. The first resonance frequency of the driving unit is 100.
The bone conduction vibration actuator according to claim 1, wherein the vibration frequency is from Hz to 400 Hz. 8. A magnetic circuit configured by using a permanent magnet, a coil arranged in a gap of the magnetic circuit, a vibrating body to which the coil is fixed and vibrates, and a vibration transmitting section for transmitting the vibration. And a suspension of a flexible spring fixed to the vibration transmission unit, the suspension flexibly supports the magnetic circuit, and enables vibration output, housing vibration volume output, and bone conduction volume output. ,
Further, the coil is configured so as to be able to output an air vibration sound generated by the vibration of the vibrating body. 9. A portable electronic device comprising a bone conduction vibration actuator as a sound source and a vibration source mounted in a casing of a portable electronic device, a mobile communication terminal or the like, wherein the bone vibration actuator comprises a piezoelectric body, A weight is fixed to the piezoelectric body via an elastic body, a resonance frequency between the weight and the elastic body is a first resonance frequency, and the casing is a vibration and vibration plate of the bone conduction transmitting section and the sound source generating section. And the casing resonance frequency, which is the resonance frequency thereof, as a second resonance frequency to be a voice band or an audible frequency, the bone conduction vibration actuator uses a piezoelectric body, and the resonance frequency of the piezoelectric body itself is set to a third resonance frequency. A portable electronic device, wherein the resonance frequency is a resonance frequency, the third resonance frequency is a higher frequency band than the second resonance frequency, and the first resonance frequency is a lower frequency band than the second resonance frequency. Child device.