JP2008252878A - Flexural vibration type actuator for electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce size and weight, enhance acoustic characteristics and improve excitation efficiency of a flexural vibration type actuator comprising a vibrator (10) including a SIM (11) and piezoelectric flexural vibration elements (12, 13) mounted on both front and rear sides thereof, and a vibrator holding part (20) holding the vibrator. <P>SOLUTION: There is provided an elongate plate-like base plate (30) holding the vibrator holding part (20), disposed under the vibrator (10) apart therefrom and extending in a length direction of the vibrator. High-rigidity parts (11a, 11b) having a predetermined length are formed at the SIM (11) in a portion adjacent to a root side end portion of the vibrator (10), or an elastic plate-like body (34) filling the gap with the vibrator for a predetermined length is disposed on the base plate (30) at a portion adjacent to the root side end portion of the vibrator (10). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a flexural vibration type actuator used for small electronic devices such as mobile phones, and more particularly to a flexural vibration type actuator for electronic devices that is small and light, has excellent acoustic characteristics, and has high excitation efficiency. is there.

Conventionally, a small flexural vibration type actuator has been developed for a small electronic device such as a cellular phone. In this actuator, a bimorph type vibrator is formed by attaching piezoelectric flexural vibration elements to both the front and back surfaces of a shim made of an elongated plate-like body. One end of the vibrator or a central portion in the longitudinal direction is held by a holding portion, and a bottom plate of an elongated case that supports the holding portion is attached to a vibration plate that also serves as a transparent protective plate on the front surface of a display panel of an electronic device. The flexural vibration excited by the vibrator is transmitted from the holding part through the bottom plate of the case that supports the vibration to the diaphragm that also serves as a transparent protective plate on the front surface of the display panel of the electronic device to which the bottom plate of the case is attached. Thus, a flexural vibration mode (DM) type speaker is formed (Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 2005-160028 JP 2006-116399 A

  In the conventional flexural vibrator type actuator, mechanical characteristics such as the cross-sectional shape of the vibrator are uniform along the longitudinal direction. For this reason, the only way to adjust the excitation efficiency and vibration characteristics for a given diaphragm is to change the length of the vibrator. When the length is changed, the width of the vibrator needs to be increased in order to obtain a constant vibration energy. As described above, there is a problem that it is difficult to optimize acoustic characteristics and excitation characteristics by simple design change and adjustment of the vibrator.

  Further, the conventional flexural vibration type actuator has been entirely housed in an elongated case. For this reason, the size, weight, and manufacturing cost of the case are increased, and it is difficult to reduce the size, weight, and cost. Furthermore, when the weight of this case increases, the fixing mechanism for fixing it to the diaphragm of a small electronic device is also large, heavy and expensive, and the excitation efficiency of flexural vibration on the diaphragm is reduced. There were problems such as high manufacturing costs.

  Accordingly, an object of the present invention is to provide a flexural vibration type actuator having good acoustic characteristics and high excitation efficiency.

  Another object of the present invention is to provide a flexural vibration type actuator that is small, lightweight, inexpensive, and has a high excitation efficiency of a flexural vibration plate to a vibration plate that also serves as a protective plate on the front panel of a small electronic device. .

  The flexural vibration type actuator of the first invention that solves the above-mentioned problems of the prior art includes a vibrator comprising a shim comprising an elongated plate-like body, piezoelectric flexural vibrators attached to both front and back surfaces of the shim, and the vibrator. A vibrator holding portion that holds one end or a central portion in the longitudinal direction as a base side end portion, and the flexural vibration excited by the vibrator is transmitted through the vibrator holding portion to the front surface of the display panel of the electronic device. This is a flexural vibration type actuator that excites a flexural vibration to a diaphragm that also serves as a protective plate. The actuator includes a base plate of an elongated plate-like body that holds the vibrator holding portion and is spaced apart from the vibrator and extends in the longitudinal direction of the vibrator. A high-rigidity portion having a predetermined length is formed in a portion of the shim adjacent to the root side end.

  According to the flexural vibration type actuator of the second invention that solves the above-mentioned problems of the prior art, the vibrator holding portion is held and arranged below the vibrator so as to extend in the longitudinal direction of the vibrator. An elongated plate-like base plate is provided, and an elastic plate-like body that fills the gap with the vibrator over a predetermined length is disposed on a portion of the base plate adjacent to the base side end of the vibrator.

  The flexural vibration type actuators of the first and second inventions are of an elongated plate-like body that holds a vibrator holding portion and is spaced apart below the vibrator and extends in the longitudinal direction of the vibrator. Since the structure includes the base plate, the conventional box is not required, and the overall size, weight, and manufacturing cost can be reduced. In addition, along with the weight reduction of this actuator, the mounting mechanism for attaching it to the diaphragm that also serves as the transparent protective plate on the front panel of electronic devices has been simplified, and the excitation characteristics of flexural vibration on this diaphragm have also been improved. The

  Further, in the flexural vibration type actuator according to the first invention of the present application, since a high-rigidity portion having a predetermined length is formed in a portion adjacent to the base side end portion of the vibrator, the length of the vibrator is not adjusted. The lowest natural frequency (resonance frequency) can be increased from the conventional low frequency range to the mid frequency range. As a result, the vibration energy in the mid-range increases, and the sound pressure level on hearing is increased. In addition, since the vibration characteristics from the mid sound range to the high sound range are also flattened, the sound pressure level versus frequency characteristic is also flattened, and the sound quality is improved.

  Further, according to the flexural vibration type actuator of the second invention of the present application, the elastic plate-like body that fills the gap with the vibrator over a predetermined length is disposed on a portion of the base plate adjacent to the base side end of the vibrator. Yes. As a result, with respect to the portion adjacent to the root side end, the amplitude of vibration is suppressed, and the result is substantially the same as when the high rigidity portion is formed in the shim, without adjusting the length of the vibrator. In addition, the lowest natural frequency can be increased from the conventional low range to the mid range. As a result, the vibration energy in the mid-range increases and the sound pressure level on hearing is increased. In addition, since the vibration characteristics from the mid sound range to the high sound range are also flattened, the sound pressure level versus frequency characteristic is also flattened, and the sound quality is improved.

  According to one preferred embodiment of the present invention, the characteristic configuration of the first invention in which a high-rigidity portion having a predetermined length is formed in a portion adjacent to the root side end portion of the shim, and When the elastic plate-like body that fills the gap with the vibrator over a predetermined length is arranged on the base plate adjacent to the base side end portion, it is possible to further increase the excitation efficiency by using the characteristic configuration of the second invention in combination. And acoustic characteristics are improved.

  According to another preferred embodiment of the present invention, the base plate is attached to the vibration plate of the electronic device by an attachment mechanism such as a double-sided adhesive tape that is discretely arranged, so that the protection plate from the base plate to the front surface of the display panel is provided. The vibration transmission characteristic to the diaphragm that also serves as the improvement is improved.

  1 is an exploded perspective view showing a configuration of a flexural vibration type actuator according to a first embodiment of the present invention, FIG. 2 is a perspective view, FIG. 3 is a plan view (A), and a BB ′ sectional view (B). ), Side view (C). This flexural vibration type actuator includes a vibrator 10, a holding unit 20, and a base plate 30.

  The vibrator 10 includes a shim 11 made of a long and thin rectangular metal, and piezoelectric bending vibration elements 12 and 13 fixed to both front and back surfaces of the shim 11 by adhesion. The flexural vibration type actuator further includes a power supply scissor bracket 14 formed by bending a metal plate rich in elasticity such as phosphor bronze for supplying operating power to the piezoelectric flexural vibration elements 12 and 13, and the power supply for the power supply. An input terminal 15 for supplying AC operating power to the piezoelectric bending vibrators 12 and 13 through the scissors 14 is provided.

  As the metal constituting the shim 11, it is desirable to select a material that is hard, such as stainless steel or aluminum alloy, has a low internal friction loss, and has a high Q in terms of acoustic characteristics and excitation efficiency. As the piezoelectric bending vibration elements 12 and 13, a structure in which a plurality of piezoelectric ceramic thin plates such as barium titanate are sandwiched between electrode layers is preferable. L-shaped bent portions 11a and 11b are formed on the base side end portion of the shim 11 over a predetermined length, which is a highly rigid portion against bending vibration.

  The base plate 30 is formed of a long and thin rectangular metal plate, and locking claws 31 and 32 standing upright from left and right side portions are formed on the base side. An opening 33 for suppressing vibration is formed in a bent portion that stands upright from the tip of the base plate 30. Considering the convenience of such bending, the base plate 30 is preferably made of a metal such as brass. The vibrator holding portion 20 is formed of a columnar body made of resin. As shown in the sectional view of FIG. 3B, the base side end of the shim 11 has a rectangular cross section formed inside the columnar body. The vibrator 10 is held in a cantilever state by the vibrator holding portion 20 by being press-fitted into the thin slit.

  A power supply scissors 14 made of a spring metal is inserted along insertion grooves formed on the top and bottom surfaces of the vibrator holding portion 20, and tip portions thereof are formed on the front and back surfaces of the vibrator 10. The electrodes are formed in pressure contact with the electrodes formed on the surfaces of the piezoelectric bending vibration elements 12 and 13. As a result, an electrical connection with a small contact resistance is completed between the power supply scissors 14 and the piezoelectric flexural vibration elements 12 and 13.

  An elastic plate-like body 34 is bonded and fixed to a location adjacent to the base side end of the base plate 30. A plate-like elastic body 35 is bonded and fixed to a portion adjacent to the end portion on the front end side of the base plate 30. After the vibrator holding portion 20 that holds the vibrator 10 in a cantilever state is inserted between the locking claws 31 and 32 that stand upright from the left and right of the base side end portion of the base plate 30, the locking claw 31 is inserted. , 32 can be bent inward. Thereby, the vibrator holding portion 20 is fixed to the upper surface of the base side end portion of the base plate 30 by caulking with the locking claws 31 and 32.

  When the vibrator holding unit 20 is fixed to the base plate 30, the tip of the shim 11 of the vibrator 10 is inserted into a vibration suppressing opening 33 formed in a bent portion standing upright from the tip of the base plate 30. Referring to the cross-sectional view of FIG. 3B and the side view of FIG. 3C, the elastic plate-like body 34 disposed at the base side end of the base plate 30 includes the base plate 30 and the vibrator 10 above the base plate 30. Are bonded and fixed to the upper surface of the base plate 30 and the bottom surface of the vibrator 10 so as to completely close the gap formed between the two. The elastic plate-like body 34 is made of an elastic body such as polyurethane, foamed resin, or soft rubber. On the other hand, the plate-like elastic body 35 arranged at the end on the front end side of the base plate 30 forms a small gap between the base plate 30 and the vibrator 10 above the base plate 30, and on the upper surface of the base plate 30. Bonded and fixed. A material softer than the elastic plate 34 is selected as the material of the plate elastic 35.

  The flexural vibration type actuator configured as described above is attached to the back surface of the vibration plate that also serves as a transparent protective plate on the front surface of a display panel of an electronic device (not shown) such as a mobile phone, with the base plate 30 interposing the double-sided adhesive tapes 36 and 37. It is done. In order to increase the attachment strength, it is desirable to dispose the double-sided adhesive tape over the entire bottom surface of the base plate 30. However, with such a configuration, the structure of the combined beam is formed by the base plate 30 and the diaphragm that also serves as the transparent protective plate, and the rigidity against the flexural vibration becomes too strong, and excitation of the flexural vibration to the diaphragm that also serves as the transparent protective plate. Efficiency may be reduced. In order to alleviate such a risk, a configuration is employed in which the double-sided adhesive tape is separated from the base side end of the base plate 30 and the tip end and is used in a small amount.

  When power is supplied from the input terminal, AC power is supplied to the piezoelectric flexural vibration elements 12 and 13 formed on the front surface side and the back surface side of the shim 11 of the vibrator 10 through the power supply scissors 14, and these flexural vibrations are supplied. Is started. The piezoelectric flexural vibration elements 12 and 13 are polarized in the thickness direction so as to have opposite polarities. For this reason, the piezoelectric flexural vibration elements 12 and 13 generate flexural vibrators that strengthen each other in opposite phases.

  The vibration excited by the vibrator 10 is converted into the vibration in the vertical direction of the vibrator holding portion 20 and transmitted to the diaphragm of a small electronic device (not shown) via the base plate 30 and the flexural vibration is excited to the diaphragm. To do. In this way, in order to accommodate the vibrator 10 inside while also protecting the vibrator 10, a base plate that performs a function similar to the bottom plate of the conventional box body is installed instead of the box body conventionally used. The For this reason, the actuator as a whole can be reduced in size, weight, and manufacturing cost. At the same time, as the weight of the actuator is reduced, the burden on the mechanism for attaching the actuator to the diaphragm of a small electronic device is reduced, and a simple mechanism such as a double-sided adhesive tape can be applied.

  Conventionally, the vibrator 10 has been housed inside a box in order to protect it from excessive impact generated by contact of a user's hand, dropping to the floor of an electronic device, or to provide a dustproof function. . However, when it is attached to a diaphragm that also serves as a transparent protective plate for a small electronic device such as a mobile phone, it can be accommodated in a space having a dustproof function on the back side of the diaphragm that also serves as a protective plate. As far as destruction by contact and dust-proofing functions are concerned, it is sufficient to remove the box and use only a base plate that performs a vibration-mediated function.

  The piezoelectric fitting vibration elements 12 and 13 constituting the vibrator 10 are made of relatively brittle piezoelectric elements such as barium titanate. For this reason, there exists a possibility of damaging by generation | occurrence | production of an excessive bending vibration. This excessive vibration is often caused by an impact when an electronic device such as a mobile phone on which the actuator is formed falls on a hard floor such as concrete, rather than a signal. In order to suppress this excessive vibration, a plate-like elastic body 35 and an opening 33 are formed.

  FIG. 4 is experimental data showing the vibration characteristics of the flexural vibration type actuator of the first embodiment. The horizontal axis represents the vibration frequency, and the vertical axis represents the driving force (Newton) generated at an input voltage of 1 volt. The solid line in the figure is the vibration characteristic of the actuator of the above-described embodiment. The dotted line indicates the vibration characteristics obtained for the actuator having a different structure except that the L-shaped bent portion 11a and 11b and the elastic plate 34 are not formed in the portion adjacent to the base side end portion of the shim 11. It is.

  As the shim is bent and the rigidity is increased by the insertion of an elastic plate, the lowest natural frequency (resonance point) of the vibrator is pushed up from the lower 150 Hz to the middle 800 H. Yes. As a result, the vibration level in the middle / high range from 800 Hz to 5000 Hz having high auditory sensitivity is increased, and the excitation efficiency is enhanced. At the same time, the vibration characteristics in the middle and high frequencies approach a flat characteristic and the acoustic characteristics are improved. The vibration characteristics can be further finely adjusted by adjusting the length of the folded portion of the shim in the longitudinal direction and the length of the elastic plate-like body 34 in the longitudinal direction.

  As described above, the configuration in which the high-rigidity portion with respect to the bending vibration is realized by bending the L-shape has been exemplified. However, appropriate changes can be made, such as further bending the tip of the bent portion above the vibrator.

  FIG. 5 is an exploded perspective view showing the configuration of the flexural vibration type actuator for electronic equipment according to the second embodiment of the present invention. In this figure, the components given the same reference numerals as those in FIGS. 1, 2 and 3 are the same as those already described with reference to the drawings in the first embodiment. About these, the overlapping description is abbreviate | omitted.

  The first point in which the second embodiment is different from the first embodiment is that, on the base side of the shim 11, the formation of high-rigidity portions (11a, 11b) by bending of both end portions is omitted. is there. A second point different from the first embodiment is that the height of the elastic plate-like body 34 can be adjusted by the thickness of the elastic adhesive layer 38 that fixes the elastic plate-like body 34 on the base plate 30.

  In both the first embodiment and the second embodiment, the surface of the elastic plate-like body 34 and the bottom surface of the vibrator 10 are bonded and fixed. Actually, there is a thickness of the shim 11, a thickness of the lower piezoelectric bending vibrator 13, or a manufacturing / assembly error of the vibrator holder 20. For this reason, a gap is easily generated between the lower surface of the vibrator 10 and the upper surface of the elastic plate-like body 34. If the two are forcibly bonded together with a gap, the elastic plate 34 is pulled downward and the center position is shifted downward. For this reason, there exists a problem that the height of the front-end | tip part of the shim 11 will shift | deviate from the center position of the up-down direction of the opening 33. FIG. Further, the elastic plate-like body 34 pulled downward may be initially bent, and the acoustic characteristics may be deteriorated.

  Therefore, as a measure for solving this problem, the second embodiment employs a structure in which the elastic plate-like body 34 is bonded and fixed onto the base plate 30 with a thick elastic adhesive layer 38 interposed therebetween. Then, by adjusting the thickness of the thick elastic adhesive layer 38, the height of the surface of the elastic plate-like body 34 is adjusted, and this does not form a gap between the bottom surface of the vibrator 10 and this. The bottom is surely contacted.

  In assembling the actuator of this embodiment, first, the plate-like elastic body 35 is bonded and fixed to the front end side of the surface of the base plate 30. Next, on the base side of the base plate 30, the adhesive film 40 having an adhesive layer formed on the back surface is attached to the surface of the base plate 30, thereby fixing the adhesive film 40 on the base plate 30. The adhesive film 40 is composed of a polycarbonate (PC) film, a polyethylene terephthalate (PET) film, or the like. This adhesive film 40 has substantially the same shape as the bottom surface of the elastic adhesive layer 34 to be adhered thereon. In order to form the elastic adhesive layer 38 on the surface of the adhesive film 40, a certain amount of elastic adhesive is poured out from the tip of a nozzle (not shown). The elastic adhesive is preferably poured out automatically using a robot.

  Even if the elastic adhesive poured out from the tip of the nozzle spreads beyond the periphery of the adhesive film 40, it spreads in the lateral direction due to the surface tension acting between the surfaces of the adhesive film 40. It is suppressed. Eventually, the bottom surface of the elastic adhesive layer 38 follows the shape of the adhesive film 40. In order to achieve this object, the kinematic viscosity of the elastic adhesive is set to an optimum value. The adhesive film 40 is manufactured by punching a large uniform single-sided adhesive tape.

  Subsequently, an elastic plate-like body 34 having a double-sided adhesive tape attached and fixed on the surface side is placed on the surface of the adhesive film 40 attached and fixed on the base plate 30. Finally, the bottom surface of the vibrator 10 is adhered and fixed to the surface of the elastic plate-like body 34. The thickness of the elastic adhesive layer 38 immediately after injection is set to be a slightly larger value. This is to ensure that the bottom surface of the vibrator 10 can be brought into contact with the surface of the elastic plate-like body 34 even when the thickness of the shim 11 or the lower piezoelectric flexure vibrator 13 is insufficient.

  The elastic plate 34 is slightly lowered by the contact pressure received from the vibrator 10. As a result, the elastic adhesive layer 38 before curing spreads a little laterally and the thickness is slightly reduced. At this time, a suitable state is realized in which the bottom surface of the vibrator 10 is bonded and fixed while lightly contacting the surface of the elastic plate-like body 34. In this state, the shim 11 is adjusted so that the tip portion of the shim 11 is positioned at the center in the opening 33. This series of assembly operations is performed quickly before the elastic adhesive layer 38 is cured.

  As the material of the elastic adhesive layer 38, a material having a small curing shrinkage rate is selected so that the thickness does not change even after curing. In addition, a silicon-based material is selected so that the elastic adhesive layer 38 after curing can exhibit appropriate elasticity without being too hard. The Shore hardness after curing of this elastic adhesive is preferably in the range of 50 to 70. Specific examples include Cemedine Super X (silicon-based) and ThreeBond 1530 (silyl group-terminated polymer). The elastic adhesive layer 38 preferably has an area of several tens of square mm and a thickness of 0.1 mm to 0.5 mm.

  The third point in which the actuator of the second embodiment shown in FIG. 5 is different from the actuator of the first embodiment is that a small rectangular plate is formed on the surface of the tip of the shim 11 and soft such as urethane foam. This is the point that the shock absorbing piece 39 of the material is bonded and fixed in advance. This absorbs the impact generated when the tip of the vibrator collides with the inner peripheral portion of the opening 33 due to the impact force generated when the electronic device is dropped or the amplitude is excessively generated during operation, thereby avoiding damage. .

  A fourth point different from the actuator of the first embodiment is that a curved portion meandering in the horizontal direction is formed on the power supply scissors 14. The curved portion is generated by dropping or the like, and serves to protect against breakage by weakening the impact force transmitted to the magnetic piezoelectric bending vibration elements 12 and 13 that are brittle and easily broken through the power supply scissors 14.

  The structure using the cantilever type vibrator that holds one end of the vibrator has been illustrated above. However, a flexural vibration type actuator configured to form a vibrator in the form of a cantilever on both sides in the longitudinal direction of the vibrator holding part, or a form in which the central part in the longitudinal direction of the vibrator is fixed by the vibrator holding part. The present invention can also be applied to a flexural vibration type actuator.

  In the first and second embodiments described in detail above, the dimensions of the vibrator 10 are preferably in the range of 20 mm to 50 mm in length, 3 mm to 10 mm in width, and 0.5 mm to 3 mm in thickness. Below the minimum dimension, the dimension is too small to make manufacture difficult. In addition, if it exceeds the above-mentioned maximum dimension, it becomes difficult to apply to a small portable device such as a cellular phone.

  Further, as the plate-like elastic body 35, a cushion material having a thickness of 0.3 mm to 1 mm made of a urethane foam material having a foaming ratio of 10 to 50 is formed. As the vibrator holding unit 20, a resin molded product is used in order to realize a complicated shape.

1 is an exploded perspective electronic diagram showing a configuration of a flexural vibration type actuator for an electronic device according to a first embodiment of the present invention. It is a perspective electronic diagram which shows the structure of the bending vibration type actuator for electronic devices of the said Example. FIG. 2 is a plan view (A) showing a configuration of a flexural vibration type actuator for electronic equipment according to the embodiment, a B-B ′ sectional view (B), and a side view (C) of the plan view (A). It is an experimental data which shows the vibration characteristic of the bending vibration type actuator for electronic devices of the said Example compared with the thing of the bending vibration type actuator for conventional electronic devices. It is a disassembled perspective electronic diagram which shows the structure of the bending vibration type actuator for electronic devices of the 2nd Example of this invention.

Explanation of symbols

10 transducers
11 Sim
11a, 11b Folded part with a predetermined length
12,13 Piezoelectric flexural vibration element
14 Power supply scissors
15 Input terminal
20 Vibrator holder
30 Base plate
31,32 Locking claw
33 opening
34 Elastic plate
35 Plate elastic body
36,37 Double-sided adhesive tape
38 Elastic adhesive layer
39 Shock absorber
40 Adhesive film

Claims (10)

An elongated plate-like vibrator composed of an elongated plate-like shim and piezoelectric flexural vibration elements attached to both the front and back surfaces of this shim, and one end or center of the vibrator in the longitudinal direction is held as a root side end. A vibration holding member that transmits the bending vibration excited by the vibrator to the vibration plate that also serves as a protective plate on the front surface of the display panel of the electronic device via the vibrator holding portion. In a flexural vibration type actuator that excites vibration,
Comprising a base plate of an elongated plate-like body that holds the vibrator holding portion and is spaced apart below the vibrator and extends in a longitudinal direction of the vibrator;
A bending vibration type actuator for electronic equipment, wherein a high-rigidity portion having a predetermined length is formed in a shim of a portion adjacent to the base side end portion of the vibrator. In claim 1,
The flexural vibration type actuator for electronic equipment according to claim 1, wherein the high-composition portion having a predetermined length formed on the shim includes a bent portion having a predetermined height that is bent at right angles from both ends in the width direction of the shim. In either claim 1 or 2,
A flexural vibration type actuator for electronic equipment, wherein a plate-like elastic body having a predetermined length that suppresses excessive vibration of the vibrator is disposed on a base plate on the tip side of the vibrator. An elongated plate-like vibrator composed of an elongated plate-like shim and piezoelectric flexural vibration elements attached to both the front and back surfaces of this shim, and one end or center of the vibrator in the longitudinal direction is held as a root side end. A vibration holding member that transmits the bending vibration excited by the vibrator to the vibration plate that also serves as a protective plate on the front surface of the display panel of the electronic device via the vibrator holding portion. In a flexural vibration type actuator that excites vibration,
Comprising a base plate of an elongated plate-like body that holds the vibrator holding portion and is spaced apart below the vibrator and extends in a longitudinal direction of the vibrator;
A flexural vibration type actuator for electronic equipment, wherein an elastic plate-like body that fills a gap with the vibrator over a predetermined length is disposed on a base plate adjacent to the base side end of the vibrator. In any one of Claims 1 thru | or 4,
The base plate is attached to a vibration plate that also serves as a protective plate on the front surface of the display panel of the electronic device by an attachment mechanism that is discretely arranged in the longitudinal direction of the vibrator. . In claim 5,
The mounting mechanism is a double-sided adhesive tape. In any one of Claims 1 thru | or 6.
A flexural vibration type actuator for electronic equipment, wherein an elastic plate-like body that fills a gap with the vibrator over a predetermined length is disposed on a base plate adjacent to the base side end of the vibrator. In any one of Claims 1 thru | or 7,
A bending vibration type actuator for electronic equipment, wherein a vibration suppressing mechanism for suppressing an excessive amplitude at the tip of the vibrator is formed at a tip of the base plate. In claim 8,
The vibration suppression mechanism includes a plate-like body that is bent substantially at a right angle from the tip of the base plate and has an opening that accommodates the tip of the vibrator, and a plate that is fixed to one surface of the front and back of the vibrator. A bending vibration type actuator for electronic equipment, characterized in that it is formed from an interfering material in the form of a coil. In any one of Claims 1 thru | or 9,
The flexible vibration actuator for electronic equipment, wherein the elastic plate-like body is fixed on the base plate with an adhesive layer also serving as height adjustment interposed therebetween.