JPH1079999A - Piezo-electric throat microphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be ultra thin type and to obtain a large output by placing a piezo-electric device in contact with a throat applying piece, converting throat vibrations into an electric signal and outputting it in a throat microphone. SOLUTION: A piezo-electric device 5 is attached in contact with a throat applying piece 1 which is attached to one end of a holding fixture 3 and connected to an output terminal 7 of an electric signal. When a user produces a sound, the mechanical vibrations of his vocal cord are transferred to the device 5 through the piece 1, the device 5 is transformed and generates voltage change, and a generated electric signal is outputted from the terminal 7. In this way, by replacing a coil structure with a piezo-electric device, an ultra thin type structure can be created, and also large output voltage is acquired so that an S/N can be improved. Also, the device 5 can be shared with an electret microphone and its use range also can be expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric throat microphone, and more particularly, to a throat microphone of a type in which a sound collecting portion frequently used in a place where surrounding noise is severe is directly applied to a vocal cord of the throat to collect sound. It is related to the improvement of.

[0002]

2. Description of the Related Art In the case of a throat microphone of the above-mentioned vocal cord direct sound collecting type, mechanical noise of a vocal cord is directly picked up instead of pneumatic vibration caused by vocalization, so that ambient noise is not picked up. There is an advantage. In addition, there is also an advantage that howling does not occur because the air vibration is not relied on.

There are various means for picking up such mechanical vibration, and a magnet type is generally used conventionally. In this conventional structure, a contact piece is provided on an iron plate supported by a case of a microphone, and a coil is provided on the opposite side of the iron plate, and connected to an output terminal of an electric signal. .

When using, use an appropriate band, etc.
The microphone is held so that the contact piece is in contact with the user's vocal cords. When the user utters, the vocal cords vibrate, and the patch picks up the mechanical vibration, and the iron plate vibrates accordingly. Then, the magnetic field of the coil changes to generate a voltage in the coil, which is output from the output terminal as an electric signal.

[0005]

However, the above-mentioned prior art is structurally complicated because the coil is included in the structure, and there is a limit to miniaturization. An output voltage of 1-2 mV is insufficient. To increase the output voltage, an amplifier may be used, but there is a problem that the size is structurally increased.

Further, the conventional magnet type throat microphone has a drawback that it cannot be shared with an electret microphone used in many electroacoustic devices (recording devices, telephones, transceivers, etc.).

An object of the present invention in view of the current state of the prior art is to provide a throat microphone which is structurally small and can obtain a large output voltage.

Another object of the present invention is to provide a throat microphone that can be used in common with an electret microphone used in many electroacoustic devices (recording devices, telephones, transceivers, etc.).

[0009]

According to the present invention, at least one of the throat pads is provided in contact with the throat pad.
The point is that the piezoelectric elements are connected to an output terminal of an electric signal.

[0010]

When the user speaks, the patch picks up the mechanical vibration of the vocal cords, and in response, the piezoelectric element in contact with the patch deforms and a voltage change occurs. The resulting electric signal is output from the output terminal.

[0011]

1 and 2 show a principle configuration of an embodiment of a throat microphone according to the present invention, in which one piezoelectric element is used. A holding piece 1 is attached to one end of the holding fitting 3, and a piezoelectric element 5 is further attached to the holding fitting 3 so as to be in contact with the holding piece 1. The piezoelectric element 5 is connected to an electric signal output terminal 7. Here, the holding fitting 3 is not an essential component, but is used from the viewpoint of structural strength.

When the user speaks to the microphone mounted in the above configuration, the patch 1 picks up the mechanical vibration of the vocal cords, and in response, the piezoelectric element 5 in contact with the patch 1 is deformed. And a voltage change occurs. The resulting electric signal is output from the output terminal 7.

FIGS. 3 and 4 show the basic structure of another embodiment of the throat microphone according to the present invention, in which two piezoelectric elements are used. First and second holding fittings 3a, 3b
Are fixed to each other at one end and extend in parallel.
The patch 1 is attached to the upper surface of the first holding metal member 3a. The piezoelectric elements 5a, 5a are provided on both surfaces of the second holding member 3b.
b are connected to the output terminal 7 in parallel. The tip of the first holding metal member 3a is bent downward and is in contact with the piezoelectric element 5a. That is, these piezoelectric elements are provided in indirect contact with the contact pieces via the holding fittings.

Also in this case, the mechanical vibration of the vocal cords accompanying the vocalization causes deformation of the piezoelectric elements 5a and 5b and hence voltage change via the contact piece 1 and the two holding fittings 3a and 3b, and the electric signal generated thereby. Is output from the output terminal 7. In this embodiment, an output voltage twice as high as in the previous embodiment can be obtained.

FIGS. 5 and 6 show an example of the specific configuration of the throat microphone of the second embodiment. Two piezoelectric elements 5a, 5b are mounted in a superposed state in the upper and lower cases 2a, 2b mutually assembled by the fastening screw 6. Further, the contact piece 1 protrudingly provided on the upper case 2a
Is in contact with the upper piezoelectric element 5a. The piezoelectric elements 5a and 5b are connected to an electric signal output terminal 7 via an amplifier 4.

When the vibration of the vocal cords accompanying the utterance is picked up by the contact strip 1, the vibration causes the piezoelectric element to be deformed and, consequently, the voltage to change, and the electric signal generated by this is amplified by the amplifier 4 and then output. Output from terminal 7.

[0017]

As is apparent from the above, in the present invention, since the conventional coil structure is replaced with a piezoelectric element, an ultra-thin structure having a thickness of 1 mm or less can be obtained. The output voltage is 5 to 50 mV, which is 5 to 50 times that of the conventional case.

As described above, the structure becomes ultra-thin,
An amplifier can be built in if necessary.
Therefore, the impedance of the circuit including the piezoelectric element can be reduced, so that even if the cable connecting the microphone and the transmission device is lengthened, no noise disturbance occurs.

The piezoelectric device according to the present invention can be used conveniently with an electret microphone used in many electroacoustic devices (recording devices, telephones, transceivers, etc.).

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view showing a principle configuration of an example of a throat microphone of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a partial cross-sectional side view showing a basic configuration of another example of the throat microphone of the present invention.

FIG. 4 is a plan view of the same.

5 is a partial cross-sectional side view showing an example of a specific configuration of the throat microphone shown in FIG.

FIG. 6 is a plan view of the same.

[Explanation of symbols]

 1: patch 2: case 3: holding bracket 4: amplifier 5: piezoelectric element 6: fastening screw 7: signal output terminal

Claims (1)

[Claims] 1. A piezoelectric throat microphone, wherein at least one piezoelectric element provided in contact with the throat pad is connected to an electric signal output terminal.