JPH07136588A - Vibration converter - Google Patents

Abstract

PURPOSE:To surely support a vibration transmission plate without increasing the rigidity of a diaphragm so as to assure a high sensitivity by converting the vibrations transmitted from a vibration source via the vibration transmission plate to the diaphragm and elastically supporting the diaphragm. CONSTITUTION:The vibration transmission member 3 is fixed to the outside surface of the diaphragm 2 fixed at its peripheral edge to the inside surface in the aperture of a cylindrical body 1a of a case 1 and a piezoelectric element 4 is stuck to the inside surface of the diaphragm 2. A circuit board 5 is disposed between a back cover 1b of the case 1 and the diaphragm 2. Circuit parts 6 for impedance conversion are installed to the circuit board 5 and an output cord 7 extending outside is connected through the case 1 thereto. Further, an elastic material 8, such as rubber, is packed between the diaphragm 2 and the circuit board 5. The vibrations transmitted to the diaphragm 2 via the vibration transmission plate 3 from the vibrating source are converted to electric signals by the piezoelectric element 4. At that time, the vibration transmission member 3 is surely elastically supported and the high sensitivity is assured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a bottomed cylindrical case,
A vibrating plate whose peripheral edge is fixed to the inner surface of the opening of the case, a vibration transmitting member fixed to the outer surface of the vibrating plate, and a piezoelectric element attached to the inner surface of the vibrating plate are provided. The present invention relates to a vibration converter for converting into.

[0002]

2. Description of the Related Art A bottomed cylindrical case, a diaphragm whose peripheral edge is fixed to the inner surface of the opening of the case, a vibration transmission member fixed to the outer surface of the diaphragm, and an inner surface of the diaphragm. In a vibration converter including a mounted piezoelectric element and converting vibration into an electric signal, the vibration transmitted from the vibrating body to the vibration transmitting member pressed against the vibrating body is transmitted to the vibrating plate, and the piezoelectric element is further provided. To be converted into an electric signal.

[0003]

In order to increase the sensitivity of the vibration converter, it is effective to increase the contact pressure of the vibration transmitting member to the vibrating body. However, in order to increase the contact pressure of the vibration transmitting member to the vibrating body, it is necessary to increase the rigidity of the diaphragm that supports the vibration transmitting member.
Since the vibration response amount of the vibrating plate, and thus the vibration response amount of the piezoelectric element, decreases, there arises a problem that the sensitivity of the vibration converter cannot be increased. The present invention has been made in view of the above problems, and has a bottomed cylindrical case, a diaphragm whose peripheral edge is fixed to the inner surface of the opening of the case, and a vibration fixed to the outer surface of the diaphragm. A vibration transducer that includes a transmission member and a piezoelectric element attached to an inner surface of the diaphragm, converts the vibration into an electric signal, and includes a vibration transmission member that abuts against the vibrating body under high pressure. It is an object of the present invention to provide a vibration transducer provided with means for supporting without increasing rigidity.

[0004]

In order to solve the above problems, according to the present invention, there is provided a bottomed cylindrical case, a diaphragm whose peripheral edge is fixed to the inner surface of the opening of the case, and an outside of the diaphragm. A vibration converter including a vibration transmitting member fixed to a side surface and a piezoelectric element attached to an inner surface of the vibration plate, the vibration plate being in contact with an elastic support floor formed of an elastic body. I will provide a. In a preferred aspect of the present invention, a plate body having a peripheral edge fixed to the inner surface of the case is disposed between the diaphragm and the case bottom, and a space between the diaphragm and the plate body is filled with an elastic body. There is. In another preferred aspect of the present invention, the space between the diaphragm and the case bottom is filled with an elastic body.

[0005]

In the present invention, the vibrating plate is in contact with the elastic supporting floor composed of the elastic body, and is elastically supported by the elastic supporting floor. Therefore, it is possible to support the vibration transmitting member that comes into contact with the vibrating body under high pressure without increasing the rigidity of the vibrating plate.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the vibration converter according to this example includes a tubular body 1a and a back cover 1 that closes one end of the tubular body 1a.
a case 1 configured by b, a diaphragm 2 having a peripheral edge fixed to the inner surface of the opening of the tubular body 1 a, a vibration transmission member 3 fixed to the outer surface of the diaphragm 2, and an inner portion of the diaphragm 2. The piezoelectric element 4 is attached to the side surface, and the circuit board 5 is provided between the diaphragm 2 and the back cover 1b and has a peripheral edge fixed to the inner surface of the tubular body 1a. An impedance converting circuit component 6 is attached to the circuit board 5. Circuit board 5
The output cord 7 connected to the printed wiring passes through the case 1 and extends to the outside of the case. The space between the diaphragm 2 and the circuit board 5 is filled with an elastic body 8 such as rubber. As a method of filling the space between the diaphragm 2 and the circuit board 5 with the elastic body 8 such as rubber, a plate-shaped body made of an elastic body such as rubber may be sandwiched between the diaphragm 2 and the circuit board 5. Alternatively, liquid rubber or the like may be injected into the space between the vibration plate 2 and the circuit board 5 and solidified.

In the vibration converter according to this example having the above structure, the vibration transmitted from the vibrating body to the vibration transmitting member 3 pressed against the vibrating body (not shown) is transmitted to the vibrating plate 2 and further piezoelectric. It is transmitted to the element 4 and converted into an electric signal. The electric signal generated by the vibration of the piezoelectric element 4 passes through the impedance conversion circuit formed by the component 6, and then is output from the vibration converter via the output code 7. In the vibration converter according to this example, the diaphragm 2
Is in contact with and elastically supported by an elastic support floor formed by an elastic body 8 such as rubber filling the space between the diaphragm 2 and the circuit board 5. Therefore, in the present vibration converter, it is possible to support the vibration transmitting member 3 that abuts against the vibrating body under high pressure without increasing the rigidity of the vibrating plate 2, and thus high sensitivity can be obtained.

FIG. 2 shows a second embodiment of the present invention. The vibration transducer according to the present embodiment has a case 11 constituted by a tubular body 11a and a back cover 11b closing one end of the tubular body 11a, and a peripheral edge fixed to the inner surface of the opening of the tubular body 11a. The vibration plate 12 includes a vibration transmission member 13 fixed to the outer surface of the vibration plate 12, and a piezoelectric element 14 attached to the inner surface of the vibration plate 12. An impedance conversion circuit component 16 is further attached to the inner surface of the diaphragm 12. An output cord 17 connected to the impedance conversion circuit component 16 penetrates the case 11 and extends to the outside of the case. The space between the diaphragm 12 and the back cover 11b is filled with an elastic body 18 such as rubber.

In the vibration converter according to this example, the diaphragm 12 is in contact with an elastic support floor formed by an elastic body 18 such as rubber filling the space between the diaphragm 12 and the back cover 11b, and Elastically supported by the floor.
Therefore, also in this vibration converter, it is possible to support the vibration transmitting member 13 that abuts against the vibrating body under high pressure without increasing the rigidity of the vibrating plate 12, and thus high sensitivity can be obtained.

[0010]

As described above, in the present invention, the vibrating plate is in contact with the elastic supporting floor composed of the elastic body, and is elastically supported by the elastic supporting floor. Therefore, it is possible to support the vibration transmitting member that abuts on the vibrating body under high pressure without increasing the rigidity of the vibrating plate, and thus high sensitivity can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a vibration converter according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a vibration converter according to a second embodiment of the present invention.

[Explanation of symbols]

 1, 11 Case 1a, 11a Cylindrical body 1b, 11b Back cover 2, 12 Vibrating plate 3, 13 Vibration transmitting member 4, 14 Piezoelectric element 5 Circuit board 6, 16 Impedance conversion circuit component 7, 17 Output code 8, 18 Elastic body such as rubber

Claims (3)

[Claims] 1. A bottomed cylindrical case, a diaphragm whose peripheral edge is fixed to the inner surface of the opening of the case, a vibration transmission member fixed to the outer surface of the diaphragm, and an inner surface of the diaphragm. A vibration transducer, comprising: a piezoelectric element attached thereto, wherein the vibration plate is in contact with an elastic support floor composed of an elastic body. 2. A plate body having a peripheral edge fixed to the inner surface of the case, the plate body being disposed between the diaphragm and the case bottom, and the space between the diaphragm and the plate body being filled with an elastic body. The vibration converter according to claim 1, wherein: 3. The vibration converter according to claim 1, wherein a space between the diaphragm and the bottom of the case is filled with an elastic body.