JPH054697U - Piezoelectric sounder - Google Patents

Abstract

(57) [Summary] [Purpose] When the handset of the above-mentioned telephone is used in a bathroom or a washroom where water is splashed or in a high humidity environment, continuous call is possible even if the water drop causes deposition. Prevents the entry of water droplets or moisture, ensures the safety of the user, improves the housing condition of the piezoelectric speaker, which is the source of transmission and reception, to the storage case, and further protects the storage case from damage by the biasing means. To prevent. A piezoelectric sounding body 50 has a storage case 51 having a storage opening 52, a piezoelectric element 61 fixed to a vibration plate surface 62a of a vibration plate 62, and a vibration plate peripheral portion 62b stored and fixed in the storage case 51. Piezoelectric element 60,
An opening reinforcing member 71 fixed to the opening edge 55 of the storage case 51 and having a small diameter opening 72 having a diameter smaller than the opening diameter, and the small diameter opening on the opening reinforcing member surface 71a around the small diameter opening 72. A water-repellent air-permeable sheet 73 fixed so as to block 72, and a non-air-permeable elastic body fixed to the opening reinforcing member surface 71a so as to cover the sheet edge portion 73a of the water-repellent air-permeable sheet 73. And a reinforcing member 74.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a piezoelectric sounding body in a telephone, which is built in the transmitter or the receiver of the transmitter / receiver and configured to convert a voice signal and a voltage value. When the handset of the handset is used in a bathroom or washroom where it is splashed with water or in a humid environment, the piezoelectric element is constructed so that it is possible to make continuous calls even if the water drops adhere to the body of the handset. It is about the sounding body.

[0002]

[Prior Art]

 In response to the era of advanced information technology in recent years, various types of information provision or communication via telephone lines have become diversified, and as a result, the place of call for the telephone is, for example, a bathroom or washroom in a hot and humid environment. It is strongly desired to meet demand in some places as well.

Regarding the above-mentioned telephone, in contrast to a conventional handset and a telephone body which are connected by a connecting line, the telephone handset and the telephone body are separated from each other to transmit and receive voice by wireless communication. A wireless telephone or the like configured to do so is applied.

Further, the handset of the radiotelephone or the like needs to have a built-in electronic circuit function and a power supply unit for performing wireless communication with the main body of the handset, but the handset can be made smaller and thinner. In response to this, a piezoelectric element using a piezoelectric effect is applied to the transmitter and the receiver instead of the electromagnetic speaker using the electromagnetic effect.

A conventional piezoelectric sounding body to which the piezoelectric element is applied will be described with reference to FIG.

A piezoelectric element 21 having a piezoelectric effect that causes polarization when pressure or tension is applied to a ferroelectric substance or the like to generate an electrostatic charge on the end face or an electrostrictive effect that causes mechanical stress when an electric field is applied is PZT (lead titanate zirconate) porcelain and other ferroelectric ceramics are used to form a thin disk.

On both main surfaces of the piezoelectric element 21, electrodes having good electric conductivity, such as silver, are coated and formed in a film shape.

The piezoelectric element 21 having the electrodes formed thereon is made of brass, SUS (stainless steel) or the like, is larger in size than the piezoelectric element 21, and is a vibrating plate of the vibrating plate 22 formed in a thin disk shape. The piezoelectric element 20 is configured by being fixed to the surface 22a with one electrode interposed.

At this time, although not shown, the other electrode attached to the piezoelectric element 21 of the piezoelectric element 20 and the vibrating plate 22 are insulated wire for exchanging an electrical signal with the outside. Is fixed by soldering and is led out from the housing case 11 which serves as a housing base of the piezoelectric element 20.

The storage case 11 is made of synthetic resin or the like and has a side wall having an annular shape or a polygonal shape, a storage opening 12 having one surface entirely opened, and an opening relative wall facing the storage opening 12. The section 19 is formed into a substantially concave shape by including the section 19.

A sound emitting hole 13 is opened at a substantially central portion of the opening relative wall portion 19, and the sound emitting hole 13 is arranged inside the storage case 11 in a mesh-like sound pressure / frequency adjustment. The film 18 is covered and further fixed by a fixing adhesive 17, so that the sound pressure / frequency characteristic of the piezoelectric element 20 with respect to piezoelectric vibration is adjusted.

A first mounting step portion 14 is provided on the inner wall surface of the storage case 11 over the entire inner surface of the housing case 11, and the piezoelectric element 20 in this example has a piezoelectric element 21 in an opening relative position. It is housed in the housing case 11 through the housing opening 12 so as to face the wall portion 19 side, and the diaphragm peripheral portion 22b of the piezoelectric element 20 is abutted on the first mounting step portion 14. Further, it is fixed by, for example, a silicone adhesive 16 for sealing.

At this time, the vibrating plate peripheral portion 22 b of the piezoelectric element 20 is coated by the sealing adhesive 16 over the entire circumference of the first mounting step portion 14 of the storage case 11. Therefore, the storage opening 12 is closed at the first mounting step portion 14.

A second mounting step 15 is formed on the inner wall surface of the storage case 11 near the end of the storage opening 12 over the entire circumference of the inner surface.

In the second mounting step portion 15, a water-repellent ventilation sheet 42 having breathability so that voices and the like can pass therethrough and having water repellency for preventing water droplets, moisture, etc. is provided in the storage opening 12 It is stretched so as to close the.

Further, on the outer peripheral surface of the storage case main body 11 on the base end side, there are provided mounting projections 17 and 17 ′ that project laterally from the peripheral surface and have a concave plan view shape. There is.

Next, a state in which the piezoelectric speaker 10 configured as described above is attached to the handset main body 30 of the wireless telephone will be described.

In FIG. 5, the transmitter / receiver main body 30 shows a mouthpiece portion or an earpiece portion, which is a main part of the present invention, and the portion is provided on an attachment base material 31 to which the piezoelectric speaker 10 is attached. Is becoming

Sound holes 32, 32 ′, etc. for passing a transmission sound or a reception sound are opened in the mounting base material 31.

In addition, screw-in holes 33, 33 ′ are formed on the inside of the mounting base material 31 of the handset main body 30 so as to correspond to the shapes of the mounting projections 17, 17 ′ of the storage case 11. Has been done.

The inside of the mounting base material 31 surrounded by the screw-in hole 33 and the screw-in hole 33 ′ is a mounting surface 34 on which the housing opening 12 side of the piezoelectric sounding body 10 is mounted.

In this state, for example, by applying a biasing means 45 such as fixing screws 46, 46 ′, the fixing screws 46, 46 ′ are fitted in the screw-in holes 33, 33 ′ provided in the mounting base material 31. The storage case 11 and the mounting base 31 are biased and fixed by being screwed in and fixing the mounting projections 17 and 17 ′.

[0023]

[Problems to be solved by the device]

 However, according to the above-described conventional piezoelectric sounding body, when the handset body is used in a bathroom or a washroom, the water-repellent ventilation sheet stretched so as to close the storage opening of the storage case body causes the storage case to be closed. The piezoelectric element housed and fixed in the main body is protected from the intrusion of water droplets and moisture, but the water-repellent ventilation sheet is an ultra-thin film and is attached to the mounting step of the storage case body with an adhesive. Therefore, there is a problem that water drops or the like collide with the water-repellent air-permeable sheet and are damaged when pressure is applied, and water enters the piezoelectric element portion to cause a failure.

When a water droplet or the like collides with the water-repellent ventilation sheet, the water-repellent ventilation sheet is bent even before the water-repellent ventilation sheet is damaged. However, there is a problem in that the handset is changed and the use of the handset is hindered.

Further, the contact portion between the housing case main body and the mounting base material is merely biased by the biasing means, and water droplets or the like enter the inside of the handset main body from the corresponding contact portion, There is a problem in that the power supply unit and the electronic function circuit unit, etc. built in the main body cause functional failures, and there is a risk of electric leakage to the user of the handset to cause electric shock.

Further, when the storage case is strongly urged by the urging means in order to prevent water droplets or moisture from entering the main body of the handset from the contact portion, the storage case of the piezoelectric element is stored. There is a problem that the housing is damaged and the sound is transmitted and received, and the storage case is damaged by the biasing force.

The present invention has been made in view of the above circumstances, and when the handset of the wireless telephone is used in a flying or humid environment such as a bathroom or a washroom, it is not covered by water drops or the like. In order to be able to carry on a continuous call even if an error occurs, the ingress of water droplets or humidity is prevented to ensure the safety of the user, and at the same time, the piezoelectric speaker, which is the source of transmission and reception, is stored in the storage case. (EN) Provided is a piezoelectric sounding body in which the housing is in a good condition and the damage of the storage case due to the biasing means is prevented.

[0028]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is such that one side is entirely opened and a housing case main body having a sound emission hole in a wall portion facing the opening, and a piezoelectric element is fixed to a surface of a diaphragm. A peripheral portion of the diaphragm is fixed to the storage case body, a piezoelectric element fixed to the opening edge of the storage case body, and an opening reinforcing member having an opening having a diameter smaller than the opening, and the small diameter. A water repellent ventilation sheet fixed to the surface of the opening reinforcing member around the opening so as to close the small diameter opening, and fixed to the surface of the opening reinforcing member so as to cover at least the edge of the water repellent sheet. The above-mentioned object is achieved by having a fixing and reinforcing member made of a non-air-permeable elastic body.

[0029]

[Action]

 According to the present invention, an opening reinforcing member having an opening having a diameter smaller than that of the opening is fixed to the opening edge of the housing case main body having the opening and having the piezoelectric element housed and fixed therein. The water-repellent air-permeable sheet is fixed so as to be blocked, and further, the fixing reinforcing member made of a non-air-permeable elastic material is fixed so as to cover the edge portion of the water-repellent air-permeable sheet, thereby forming the piezoelectric sounding body. Therefore, by reducing the diameter of the stretched surface area of the water-repellent ventilation sheet to improve the resistance to collision of water droplets and the like, it is possible to prevent the water-repellent ventilation sheet from being damaged or deflected.

Further, since the water-repellent air-permeable sheet is sandwiched at the opening edge by the opening reinforcing member and the fixing and reinforcing member, the tension of the water-repellent air-permeable sheet is reinforced to increase the mounting strength. Thereby, the drag force against the collision of the water droplets or the like can be increased.

Further, the fixing reinforcing member for reinforcing the water-repellent ventilation sheet together with the opening reinforcing member is made of a non-permeable elastic material, and the fixing reinforcing member is attached to the mounting base of the handset main body together with the storage case main body. By urging, the fixing and reinforcing member comes into close contact with the mounting base material, and airtightness is achieved in this portion, so that the water droplets or moisture can be prevented from entering the main body of the handset.

Further, since the non-breathable elastic body constitutes the fixing and reinforcing member, the elasticity serves as a cushioning member against the biasing force, so that the storage case can be prevented from being damaged by the biasing force.

[0033]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a piezoelectric speaker according to the present invention, FIG. 2 is a partial sectional view showing a main mounting state of a water-repellent ventilation sheet in the embodiment, and FIG. Fig. 4 is a sectional view showing a state where the piezoelectric sounding body in the example is mounted on the mounting base material of the handset body, and Fig. 4 is a partial sectional view showing a main mounting state of the piezoelectric sounding body on the mounting base material in the embodiment. is there .

In FIG. 1, the piezoelectric speaker 50 includes a storage case 51 having a storage opening 52, a piezoelectric element 61 fixed to a diaphragm surface 62 a of a diaphragm 62, and a diaphragm peripheral portion 62 b. The piezoelectric element 60 housed and fixed in the case 51, the opening reinforcing member 71 fixed to the opening edge 55 of the housing case 51 and having a small diameter opening 72 having a diameter smaller than the opening diameter, and the small diameter opening. The water-repellent ventilation sheet 73 fixed to the opening reinforcing member surface 71a around the portion 72 so as to close the small-diameter opening 72, and the opening so as to cover the sheet edge portion 73a of the water-repellent ventilation sheet 73. Reinforcing member and a fixing reinforcing member 74 made of a non-air-permeable elastic material fixed to the surface 71a.

A piezoelectric element 61 having a piezoelectric effect that causes polarization when pressure or tension is applied to a ferroelectric substance or the like to generate electrostatic charges on the end face or an electrostrictive effect that causes mechanical stress when an electric field is applied is PZT (lead titanate zirconate) porcelain and other ferroelectric ceramics are used to form a thin disk.

Electrodes are formed on both main surfaces of the piezoelectric element 61 by film-forming metal such as silver having good electric conductivity.

The piezoelectric element 61 on which the electrodes are formed is made of brass or the like, is larger in size than the piezoelectric element 61, and is formed on the vibration plate surface 62 a of the vibration plate 62 formed in a thin disk shape. The piezoelectric element 60 is configured by being fixed by interposing the electrodes.

The vibrating plate 62 serves as a base material for mounting the piezoelectric element 61 and is provided to mediate piezoelectric vibration.

Although not shown, the other electrode attached to the piezoelectric element 61 of the piezoelectric element 60 and the vibrating plate 62 are provided with an insulating coating wire for exchanging an electrical signal with the outside. It is assumed that the piezoelectric element 60 is fixed by solder and is led out from a storage case 51 that serves as a housing base of the piezoelectric element 60.

The storage case 51 is made of synthetic resin or the like and has a side wall having an annular shape or a polygonal shape, a storage opening 52 having one surface entirely opened, and an opening relative wall facing the storage opening 52. By including the portion 59, the cross section is formed into a substantially concave shape.

A sound emitting hole 53 is opened at a substantially central portion of the opening relative wall portion 59, and the sound emitting hole 53 is arranged inside the storage case 51 to form a mesh-like sound pressure / frequency adjustment. By covering the film 58 and further fixing it with a fixing adhesive 57, the sound pressure / frequency characteristics of the piezoelectric element 60 with respect to piezoelectric vibration are adjusted.

An attachment step portion 54 is formed on the inner wall surface of the storage case 51 over the entire inner surface thereof, and the piezoelectric element 60, in this example, the piezoelectric element 61 is provided with an opening relative wall portion. It is housed in the housing case 51 through the housing opening 52 so as to face the 59 side, and the diaphragm peripheral portion 62b of the piezoelectric element 60 is abutted at the mounting step portion 54. It is fixed by a silicone sealing adhesive 56.

At this time, the vibrating plate peripheral portion 62 b of the piezoelectric element 60 is applied by the sealing adhesive 56 over the entire circumference of the mounting step portion 54 of the storage case 51, and The opening 62 is closed in the first mounting step 14.

Further, the end surface of the storage case 51 on the side of the storage opening 52 is an opening edge 55, and the opening edge 55 has a small diameter smaller than the diameter of the storage opening 52. The portion 72 is opened in the substantially central portion, and an annular opening reinforcing member 71 is fixed by, for example, an adhesive member 76 whose both surfaces are coated with an adhesive.

At this time, the opening reinforcing member 71 is made of the same resin and the like as that of the storage case 51, and the surface portion of the opening reinforcing member 71 is notched around the small diameter opening 72. The surface notch 71b is formed by being carved.

A water-repellent air-permeable sheet 73 having air-permeability so that voices and the like can pass therethrough and water-repellent air-permeable sheet 73 for preventing water drops or moisture from drip is provided in the surface cutout 71 b of the opening reinforcing member 71. For example, an adhesive or the like is attached to close the small diameter opening 72.

Further, an annular fixing reinforcing member 74 having an opening having the same diameter as the small diameter opening 72 is bonded to the surface cutout 71b of the opening reinforcing member 71 to which the water repellent ventilation sheet 73 is attached. The agent and the surface notch 71b are fixed by being fitted.

At this time, the fixing and reinforcing member 74 is made of, for example, a non-air permeable elastic body that has a non-air-permeable property that prevents the permeation of a gas or a liquid such as urethane, and also has an elasticity that acts as a buffer. Has been formed.

As will be described in detail with reference to FIG. 2, the water-repellent ventilation sheet 73 is sandwiched and fixed between the opening reinforcing member 71 and the fixing reinforcing member 74, and the water-repellent ventilation sheet 73 is positioned closer to the storage opening 52. The small diameter opening 72 having a small diameter is closed.

In addition, as suggested in an enlarged manner in FIG. 2, the cross-section thickness of the fixing reinforcing member 74 is larger than the cross-section thickness of the surface cutout portion 71 b of the opening reinforcing member 71, and therefore the fixing reinforcing member 74. While being fitted into the surface cutout portion 71b, is projected from the opening reinforcing member surface 71a by an amount corresponding to the thickness of the projecting elastic body portion 75.

Next, a state in which the piezoelectric sounding body 50 configured as described above is attached to the main body 80 of the handset of the wireless telephone will be described with reference to FIG.

In FIG. 3, the transmitter / receiver main body 80 shows a mouthpiece portion or an earpiece portion, which is a main part of the present invention, and this portion is attached to a mounting base material 81 to which the piezoelectric speaker 50 is attached. Is becoming

Sound holes 82, 82 ′, etc. for passing a transmission sound or a reception sound are opened in the mounting base material 81.

Further, inside the main body 81 of the attachment base material 81 in the main body 80 of the handset, screw holes 83, 83 ′ are cut out corresponding to the shape of the storage case 51.

The inside of the mounting base material 81 surrounded by the screw-in hole 83 and the screw-in hole 83 ′ serves as a mounting surface 84 on which the storage opening 52 side of the piezoelectric sound generator 50 is mounted.

In this state, by applying a biasing means 77 such as fixing screws 78, 78 ′, the fixing screws 78, 78 ′ are fitted in the screw holes 83, 83 ′ provided in the mounting base 81. The storage case 51 and the mounting base material 81 are screwed in and biased and fixed.

More specifically with reference to FIG. 4, the solid reinforcing member 74 formed of the non-breathable elastic body has only the elastic body portion 75 protruding from the opening reinforcing member surface 71 a of the opening reinforcing member 71. Since it is protruding and is urged by the urging force 77a by the urging means 77 in this state, a close contact portion 90 is formed at the contact portion between the fixing reinforcing member 74 and the mounting base material 81. ing.

According to the piezoelectric speaker 50, the opening edge 55 on the storage opening 52 side of the storage case 51 in which the piezoelectric element 60 is stored has the small-diameter opening 72 having a smaller diameter than the storage opening 52. The opening reinforcing member 71 is fixed, a water repellent ventilation sheet 73 is stretched so as to close the small diameter opening 72 of the opening reinforcing member 71, and the water repellent ventilation sheet 73 is sandwiched together with the opening reinforcing member 71. Since the fixing reinforcement member 74 is fixed, the stretched area of the water-repellent ventilation sheet 73 is reduced, and when the handset main body 80 is used in a bathroom or the like, the resistance force against the collision of water droplets or the like is reduced. Can be improved.

Further, since the water-repellent ventilation sheet 73 is sandwiched and fixed at the opening edge 55 by the opening reinforcing member 71 and the fixing reinforcing member 74, the tension force of the water-repellent ventilation sheet 73 is reinforced. The mounting strength can be increased.

Further, the fixing reinforcing member 74 is made of a non-air-permeable elastic material, and is larger than the cross-sectional thickness of the surface cutout portion 71 b of the opening reinforcing member 71 so that the fixing reinforcing member 74 has the opening reinforcing member 74. A protruding elastic body portion 75 protruding from the surface 71a is provided, and in this state, the contacting contact portion 90 is configured by urging the mounting base material 81 with the storage case body 51 by the urging means 77. Therefore, it is possible to prevent the water droplets or the moisture from entering the handset main body at the close contact portion 90.

Further, since the fixing and reinforcing member 74 is formed of the non-air-permeable elastic body, the elasticity serves as a buffer member for the urging force 77a, so that the storage case body 51 is not damaged by the urging force 77a. It can be prevented.

[0063]

[Effect of the device]

 Since the piezoelectric sounding body according to the present invention is configured as described above, it has the following effects.

(1) An opening reinforcing member having an opening having a diameter smaller than that of the opening is fixed to the opening edge of the storage case body, and a water-repellent ventilation sheet is fixed so as to close the opening having the small diameter. Further, since the piezoelectric sounding body is constituted by fixing the fixing member made of a non-breathable elastic body so as to cover the water-repellent ventilation sheet, the stretched area of the water-repellent ventilation sheet can be reduced in diameter. By increasing the resistance to the collision of water drops and the like, it is possible to prevent the water-repellent air-permeable sheet from being damaged or bent.

Therefore, it is possible to prevent the failure of water invading the piezoelectric element portion due to the breakage of the water-repellent ventilation sheet, and to prevent the piezoelectric vibration of the piezoelectric element from changing due to the bending of the water-repellent ventilation sheet, thereby providing a comfortable feeding. This has the excellent effect of ensuring the use of the handset and extending the life of the handset body.

(2) Since the water-repellent ventilation sheet is sandwiched and fixed at the opening edge by the opening reinforcing member and the fixing and reinforcing member, the tension of the water-repellent ventilation sheet is reinforced and the attachment strength is improved. Therefore, it has an excellent effect that the drag force against the collision of the water droplets can be increased.

(3) The fixing reinforcing member that reinforces the water-repellent ventilation sheet together with the opening reinforcing member is made of a non-air-permeable elastic material, and the fixing reinforcing member is attached to the mounting base of the handset main body together with the storage case main body. It is built in the handset main body by preventing the water droplets or moisture from entering the main body of the handset by forming a close contact part by urging. It has an excellent effect that it protects the power supply unit and the electronic function circuit unit, etc., and prevents the occurrence of electric leakage, etc. to ensure the safety of the handset user.

(4) Since the non-breathable elastic body constitutes the fixing and reinforcing member, the elasticity serves as a buffer member for the urging force, so that the storage case body can be prevented from being damaged. At the same time, there is an excellent effect that the housing state of the piezoelectric element in the storage case main body is made good and a clear transmission / reception sound can be produced.

(5) In the structure for mounting the piezoelectric sounding body, the intrusion of water droplets or moisture into the main body of the handset is prevented by the close contact portion formed by the fixing reinforcing member and the biasing means. As a result, airtightness with an adhesive or the like is unnecessary, and therefore, there is an excellent effect that labor and cost required for the airtightness can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a piezoelectric speaker according to the present invention.

FIG. 2 is a partial cross-sectional view showing a main mounting state of the water-repellent ventilation sheet in the example.

FIG. 3 is a cross-sectional view showing a state in which the piezoelectric speaker in the embodiment is mounted on a mounting base material of a handset main body.

FIG. 4 is a partial cross-sectional view showing a main mounting state of the piezoelectric speaker to the mounting base material in the example.

FIG. 5 is a cross-sectional view showing a state in which a conventional piezoelectric speaker is mounted on a mounting base material of a handset main body.

[Explanation of symbols]

 50 Piezoelectric Sounder 51 Storage Case Main Body 52 Storage Opening 53 Sound Ejecting Hole 54 Mounting Step 55 Opening Edge 60 Piezoelectric Element 61 Piezoelectric Element 62 Vibration Plate 62a Vibration Plate Surface 62b Vibration Plate Peripheral Area 71 Opening Reinforcement Member 71a Opening Reinforcement Member Surface 71b Surface notch 72 Small-diameter opening 73 Water-repellent ventilation sheet 73a Sheet edge 74 Sticking reinforcement member 75 Projection elastic body

Claims (1)

[Claims for utility model registration] 1. A storage case main body having a sound opening in the wall opposite to the opening and a piezoelectric element fixed to the surface of the diaphragm. A piezoelectric element having a peripheral portion of the diaphragm fixed to the storage case body, an opening reinforcing member fixed to an opening edge of the storage case body and having an opening portion having a diameter smaller than the opening, and the small diameter. A water repellent ventilation sheet fixed to the surface of the opening reinforcing member around the opening so as to close the small diameter opening, and fixed to the surface of the opening reinforcing member so as to cover at least the edge of the water repellent sheet. And a fixed reinforcing member made of a non-breathable elastic body.