JPH073744Y2 - Touch microphone - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is called a bone-conduction type microphone or the like that outputs a voice signal by contacting a pickup with the user's throat to capture the vibration generated by the sound. More specifically, the present invention relates to a contact microphone in which a conversion element that converts vibration into an audio signal is configured to reliably capture even a slight vibration.

[Conventional technology]

A contact microphone that is attached so that the pickup touches the throat and ear canal of the user, captures vibrations due to vocalization, converts this to a voice signal and outputs it, cuts noise and noise in the surrounding environment Since it is possible to extract only the person's voice, it is becoming popular, for example, for communication at construction sites and microphones for motorcycle radio communication devices.

Such a contact microphone has a plate-shaped piezoelectric element whose one end is supported in a cantilever manner by a damper 2 in a hollow case 1 as shown in FIG. It is configured by sticking a pickup 4 made of ABS resin or the like on. The vibration caused by the sound is captured by the entire case 1, the internal piezoelectric element 3 is vibrated, and the piezoelectric element 3 converts the vibration into a sound electric signal. In order to reliably capture the vibration of the case 1, a weight 5 is attached to the other end of the piezoelectric element 3 so that the piezoelectric element 3 can be captured even with a slight vibration.

[Problems to be solved by the device]

However, the vibration caused by the sound is extremely small, and it is necessary to firmly attach the case 1 to the throat and temples of the wearer in order to reliably capture the minute vibration. As a result, the wearer feels too much pressure on the throat and ear canal, and the fit is poor. Further, since the vibration can be captured by the case 1 as a whole, high external noise may be captured by the case 1, which contributes to the utterance of noise.

Therefore, an object of the present invention is to provide a contact microphone that can accurately capture only vibration due to sound generation and that can be worn without causing discomfort to the wearer.

[Means for Solving the Problems]

This invention is a contact microphone that is attached so as to contact with a part of the body, and is arranged so that a part of the contact microphone comes into contact with the pickup in a contact microphone in which the vibration generated by the sound is captured by the pickup and output as an audio signal by the conversion element. One end is provided with an elastic member supported in a cantilever shape, and the conversion element is characterized in that the one end is supported in a cantilever shape at the other end side of the elastic member.

[Action]

With the above configuration, the vibration captured by the pickup is transmitted to the elastic member and vibrates the elastic member. Since one end of the elastic member is supported in a cantilever manner, the other end of the elastic member can vibrate greatly even with slight vibration. Since the conversion element is also supported on the other end side of this elastic member in the same cantilever manner, the other end vibrates greatly even with a slight vibration. Since the conversion element is also supported on the other end side of this elastic member in the same cantilever manner, it is possible to accurately capture the vibration of the elastic member which is largely shaken. This configuration also vibrates the conversion element directly with the vibration of the pickup, so the conversion element does not vibrate due to the vibration applied to the case etc., and even if vibration is applied to the case due to external noise etc., it can be picked up. Instead, it is possible to accurately capture only the vibration applied to the pickup.

〔Example〕

An embodiment of the present invention shown in the drawings will be described below. Throughout each embodiment, the same components as those in the embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

First, a first embodiment of the present invention shown in FIG. 1 will be described. In this embodiment, a throat-type contact microphone that is attached to the throat of the user is taken as an example. The contact microphone 11 includes a hollow case 12 made of metal or synthetic resin,
A pickup 13 made of ABS resin or the like and brought into contact with the throat of the user, and a conversion element 14 composed of a plate-shaped piezoelectric element.
And have. An opening 15 is formed on one surface of the case 12, and a plate-shaped spring plate member 16 is located inside the case 12 such that a substantially central portion thereof is located in the opening 15. Spring plate material 16
Is made of a metal plate or synthetic resin having a spring made of stainless steel, phosphor bronze, or the like.
One end is fixed to the upper side of the side of the case 12 by the damper 17, and the other end is free, that is, is supported in a cantilever shape.

The pickup 13 is integrally formed with a protrusion 18 which is tapered downward at the center of its lower surface. The pickup 13 is attached to the case 12 via an elastic material 19 such as urethane foam or rubber so that the tip of the protrusion 18 is located in the opening 15 of the case 12.

The length of the protrusion 18 to the tip is set to a length sufficient to come into contact with the upper surface of the spring plate member 16 through the opening 20 of the elastic member 19 through the opening 15 of the case 12.

The conversion element 14 has a spring plate member 16 at one end through a damper 21.
Is supported by the other end of the spring plate member 16 and is positioned substantially horizontally on the lower surface of the spring plate member 16. A weight 22 is attached to the other end of the conversion element 14 as in the conventional case.

The contact microphone 11 configured as described above is mounted so that the pickup 13 is brought into contact with the throat of the user. The vibration of the throat caused by the user's pronunciation is picked up 13
Is transmitted to the spring plate member 16 at the tip of the protrusion 18.
Since one end of the spring plate member 16 is fixed by the damper 17, its vibration appears as a large swing to the other end side by the lever principle. Since one end of the conversion element 14 is attached to the other end of the spring plate member 16 via the damper 21, the conversion element 14 also largely swings. The conversion element 14 is also attached to the spring plate member 16 in a cantilever manner, and the weight 22 is attached to the tip thereof, so that it can vibrate greatly by the lever principle and the inertia provided by the weight 22. Therefore, even minute vibrations uttered in the throat can be accurately captured, and vibrations due to external noise applied to the case 12 are absorbed by the elastic material 19, so that the conversion element 14 does not operate.
Since the vibration of the conversion element 14 is performed via the cushioning material of the spring plate material 16, it is possible to protect it from damage due to the vibration.

The second embodiment shown in FIG. 2 is an in-ear type contact microphone 23 which is inserted into an ear canal to capture vibrations transmitted to the ear canal during sounding.
Is shown. The case of the contact microphone 23 includes a case body 24 located outside the ear hole and a case body 24.
And a hollow, generally frustoconical ear insertion case portion 25, one end of which is integrally attached to the side surface of the. The ear insertion case portion 25 is inserted into the ear hole. Similar to the first embodiment, the conversion element 14, the spring plate member 16 and the like are mounted in the ear insertion case 25. An opening 26 is formed in a part of the circumferential surface of the ear insertion case 24.
Is formed, and the pickup 13 is mounted on the opening 26 via the elastic material 19. In this case, the elastic material 19 and the pickup 13 may be formed in an arc shape according to the shape of the ear hole.

The third embodiment shown in FIG. 3 is an ear-insertion type contact microphone similar to the second embodiment, and a pickup is also configured by a part of the ear-insertion case portion. That is, in the contact microphone 31, a band-shaped pickup piece 33 is formed in a part of the ear insertion case portion 32 so as to extend in the front end direction. The tip end side of the pickup piece 33 is integrally attached to the ear insertion case 32, and the rear end side is located on the case body 23 side and is a free end. On the underside of this free end,
The protrusion 34 corresponding to the protrusion 18 of the pickup 13 in each of the above-described embodiments is integrally formed. The upper surface of the pickup piece 33 is positioned so as to project from the upper surface of the ear insertion case portion 32. As a result, the vibration in the ear hole caused by the sound is captured by the pickup piece 32 and transmitted from the spring plate material 16 to the conversion element 14. Therefore, the pickup and the elastic material can be omitted as described above, and the size can be further reduced.

[Effect of device]

As described above, the contact microphone of the present invention is provided with the elastic member whose one end is supported in a cantilever manner so that a part thereof comes into contact with the pickup, and one end of the conversion element is provided on the free end side of the elastic member. Since the vibration sensor is attached, the vibration from the pickup is directly applied to the elastic member, and the conversion element is vibrated by the vibration amplified by the elastic member. Therefore, even a slight vibration can be reliably captured, and even if vibration due to external noise is transmitted to the case, the vibration does not vibrate the conversion element, and it is possible to output only the noise of the user without noise. it can. Further, as described above, since the pickup directly captures the vibration, it does not require a strong mounting force as in the conventional case, and can be used without feeling discomfort or pressure.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, FIG. 2 is a side view showing a second embodiment of the present invention by cutting a part thereof, and FIG. 3 is a third embodiment of the present invention. FIG. 4 is a longitudinal sectional view showing a conventional example, with a side view partially cut away. In the drawing, 11, 23 and 31 are contact microphones, 12 is a case, 13 is a pickup, 14 is a conversion element, 16 is a spring plate material,
17, 21 are dampers, 18 and 34 are protrusions, 22 is a weight, 24 is a case body, 25 and 32 are ear cases, and 33 is a pickup piece.

Claims (1)

[Scope of utility model registration request] 1. A contact microphone, which is mounted so as to come into contact with a part of the body, in which a vibration generated by a sound is captured by a pickup and is output as an audio signal by a conversion element, the contact microphone being arranged so as to come into contact with the part of the pickup. A contact mylophone that has an elastic member having one end supported in a cantilever shape, and the conversion element has one end supported in a cantilever shape at the other end side of the elastic member.