JPS58153490A - Microphone - Google Patents

Abstract

PURPOSE:To obtain a microphone which is free from the disturbance of ambient noise, by abutting directly a diaphragm of the microphone on the lower jaw bone to sense voice. CONSTITUTION:A diaphragm 5 is formed into a concave shape so as to secure a contact with the lower jaw bone, and carbon grains 6 are packed between the diaphragm 5 and a fixing plate 7. The diaphragm 5 is connected to a power supply cell and the primary side of a transformer 9 via lead wires 8. Thus the diaphragm 5 abuts properly on the lower jaw bone in order to transmit directly the vibrations of the vocal bands to the cell 11 and the transformer 9 via the lower jaw bone. The current at the primary side of the transformer 9 varies in reponse to resistance variations of the carbon grains 6, and an audio current can be extracted out of the secondary side of the transformer 9. The electrode of one side of a parallel capacitor can be used to a diaphragm in place of microphone parts 5-7. At the same time, a ceramic piezoelectric element is also available. In such a constitution, a signal having excellent S/N can be obtained even with severe ambient noise.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microphone that is less susceptible to the effects of noise.

Conventional microphones detect sound waves through the air. In other words, conventional microphones receive sound vibrations as air vibrations. The air vibrations cause the microphone's diaphragm to vibrate. The vibrations of the diaphragm are then converted into electrical signals.

Air vibrations are easily drowned out by external noise. For this reason, conventional microphones have not been able to fully demonstrate their functions in noisy places.

SUMMARY OF THE INVENTION An object of the present invention is to provide a microphone that eliminates the above-mentioned drawbacks of the prior art and can produce clear sound even in noisy places.

When a person tries to make a sound, the vocal cords first vibrate. The vibrations of the vocal cords are transmitted through the air as voice. When the vocal cords vibrate, the skull also vibrates.

In particular, the maxilla vibrates strongly.

The present invention has been made with this in mind. The microphone of the present invention directly senses vibrations of the mandible and converts the vibrations into electrical signals.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1A is a front view showing the microphone 1 of the present invention attached to a person's face 2.

FIG. 1B is a side view of FIG. 1A.

The microphone 1 according to the present invention is attached to a portion corresponding to the mandible 3. The method for attaching the microphone 1 is not particularly limited. For example, microphone 1 may be damaged by excessively sticky material.
You can also paste it. Also, beauty like glasses 1
4 may be provided and the microphone 1 may be hung over the ear (see FIG. 2). Furthermore, a supporting member 15 is provided to support the microphone 1.
You can also wear it around your neck (see Figure 3). There are many other ways to attach the microphone 1. Microphone 1
It can be attached anywhere as long as it corresponds to the mandible 3. Vibrations of the mandible 3 are converted into electrical signals by the microphone 1.

FIG. 4 is a perspective view showing an example of the microphone 1 according to the present invention.

It is desirable that the microphone 1 be formed to draw a gentle arc in accordance with the shape of the mandible 3. 4 is a cable. 5 is a diaphragm.

FIG. 5 is a sectional view showing the principle of the microphone 1 of the present invention.

The vibrations of the mandible 3 are transmitted to the diaphragm 5. Then, the pressure applied to the diaphragm 5 and the dark carbon powder 6 of the fixed electrode 7 changes. Therefore, the resistance of the carbon powder 6 changes. Therefore, the direct current flowing through the circuit 8 changes depending on the strength of the voice.

The direct current flows due to the electromotive force 11. A DC component and a signal current of audio frequency flow through the primary side of the induction coil 9 . Then, only a signal current at the audio frequency appears on the secondary side of the induction coil 9 due to electromagnetic induction.

The principle of the microphone 1 according to the present invention is not limited to that shown in FIG. 5. For example, one electrode of a parallel capacitor can be used as the diaphragm 5. In this case, the audio frequency can be extracted from the concussion change due to vibration. It is also possible to utilize the piezoelectric phenomenon of ceramics.

FIG. 6 shows a microphone [1] using the microphone 1 of the present invention.
FIG. 2 is a front view showing an example of headphones with a phone.

The microphone 1 of the present invention is provided at the bottom of a conventional headphone 10. In this way, the microphone 1 conveniently hits the base of the mandible 3.

The headphone with microphone shown in FIG. 6 has a neat shape and is very desirable.

FIG. 7 is a perspective view showing a helmet provided with the microphone 1 of the present invention.

A helmet 12 used on a motorcycle etc. has a chin strap 1.
It has 3 on it. The microphone 1 of the present invention is provided on this chin strap 13. The helmet shown in Figure 7 can be used by police officers when riding motorcycles.

Furthermore, the microphone 1 of the present invention can be attached to a helmet used at a factory or a construction site. The noise is especially bad in factories and construction sites. Therefore, the microphone 1 of the present invention is very suitable for factories and construction sites.

Since the microphone of the present invention is configured as described above, it is possible to directly sense sound from vibrations of the mandible. In other words, the vibrations of the vocal cords do not travel through the air. Therefore, the microphone of the present invention is less affected by external noise. The microphone of the present invention can produce clear sound.

[Brief explanation of drawings]

FIG. 1A is a front view showing the microphone 1 of the present invention attached to a person's face 2, FIG. 1B is a side view of FIG. 1A, and FIGS. 2 and 3 are the attachment of the microphone 1 of the present invention. is a front view showing an example of the method, FIG. 4 is a perspective view showing an example of the microphone 1 according to the invention, FIG. 5 is a sectional view showing the principle of the microphone 1 of the invention, and FIG. FIG. 7 is a front view showing an example of a helmet equipped with a microphone 1 according to the present invention. 1... Microphone 2... Face 3... Mandible 4... Cable 5... Vibration plate 6... Carbon powder 7... Fixed electrode 8...・Circuit 9... Induction coil 10... Headphones 11... Electromotive force 12... Helmet 13... Chin strap 14... Vines 15... Supporting member Fig. 1 (A) (B ) Figure 2 Figure 3

Claims (1)

[Claims] 1. A microphone for amplifying sound, characterized in that the microphone is configured to be applied to a human mandible and detect sound from vibrations of the maxilla.