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JPS5568889

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DESCRIPTION JPS5568889
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an example of a
conventional electro-acoustic transducer, and FIG. 2 is a cross-sectional view of an embodiment
of an electro-acoustic transducer according to the present invention. Explanation of symbols of
main parts 1 иии Sound pressure type conversion element 3 и и и и и и Through hole Conversion
element.
The present invention relates to an electro-acoustic intertransducer, and more particularly to an
electro-acoustic intertransducer using a sound pressure type transducer element and a vibration
pickup type transducer element. As an electro-acoustic transducer, there is an earphone etc.
which converts an electric signal to sound pressure and transmits it to an eardrum, and as an
acoustic-electric transducer, it detects vibration in the ear canal and -1-?, Z electric There is an
ear microphone or the like that converts it into a signal. This ear microphone is classified into a
sound pressure type ear microphone that converts air vibration in the ear canal, that is, sound
pressure, into an electric signal, and a vibration pickup type ear microphone that picks up bone
vibration in the wall of the ear canal and converts it directly into an electric signal. In recent
years, the utilization rate of the vibration pickup type ear microphone has been increased as a
sufficient noise suppression in the outside world. Then, use the combination of the earphone and
the ear microphone with the earphones on one ear and the ear microphone on the other ear so
that you can talk while using both hands for work in high noise such as construction site etc. It is
done. However, if both ears are used, there is no information in the outside world, and there are
problems with maintenance and safety, so that only one ear is used to solve the problems of
electro-acoustic and acoustic-electricity. An electro-acoustic interconverter having both of the
conversion functions has been devised and its cross section is shown in FIG. The electro-acoustic
interconverter includes, for example, a sound pressure type conversion element 1 as a first
conversion element for converting an electric signal into sound pressure 2-, an element storage
unit 2 for storing the conversion element 1, and the element storage The supporting member 6a
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fixes one end in the space 5 separated from the sound pressure introducing portion 4a having
the through hole 3 communicated with the portion 2 and insertable into the external auditory
canal and the through hole 3 of the sound pressure introducing portion 4a For example, it
comprises the vibration pickup type conversion element 7 as a second conversion element for
converting the vibration into an electric signal. In such an electro-acoustic interconverter, the
mechanism is complicated because the space 5 in which the vibration pips and the qual-up type
conversion element 7 are installed is separated from the through hole through which the sound
pressure passes. And there is a drawback that the size is large. The object of the present
invention is to provide an electro-acoustic interconverter which overcomes the above-mentioned
drawbacks. Hereinafter, the present invention will be described in detail with reference to FIG.
FIG. 2 is a cross-sectional view of an embodiment of the electro-acoustic interconverter according
to the present invention, and the same parts as FIG. 1 are indicated by the same reference
numerals. In the figure, the vibration pick-up type conversion element 7 is provided in the
through hole 3 of the sound pressure introducing portion 4, and the side of the element storage
portion 2 where the sound pressure type conversion element 1 is disposed and the through hole
3 side One end is supported by a support member 6 having a hole 8 for communicating the
A piezoelectric element insensitive to sound pressure is used as the vibration pickup type
conversion element 7. By inserting the electro-acoustic intertransducer into the ear canal, the tip
of the sound pressure introducing unit 4 contacts the wall of the ear canal, that is, the bone of
the ear canal. In this state, when the bone portion vibrates by vocalization, the integrated element
storage unit 2 and the sound pressure introducing unit 4 move up and down, and the imaging
pickup type conversion element 7 vibrates and converts it into an electric signal. On the other
hand, the sound pressure converted from the electric signal in the sound pressure type
conversion element 1 is transmitted to the eardrum of the ear canal at the back of the hole 8 and
the through hole of the support member 6 and the through hole 3. In the above embodiment, the
sound pressure type conversion element 1 is used as an electro-acoustic conversion element
(earphone) and the vibration pickup type conversion element 7 is used as an acoustic electric
conversion element (ear microphone). It is also possible to use the element 1 as an acousticelectric conversion element (i-ya microphone) and the vibration pickup type conversion element
7 as an electro-acoustic conversion element (earphone). As described above in detail, by
arranging the vibration pickup type conversion element 7 in the through hole 3 of the sound
pressure introducing portion 4, the structure can be simplified, and the size and weight can be
reduced. In addition, since the manufacturing is easy and the number of processing steps is
reduced, the cost can be reduced. Since the vibration directions of the sound pressure type
conversion element 1 and the vibration pickup type conversion element 7 are shifted, that is, the
vibration pickup type conversion element 7 in the vertical direction against the vibration in the
horizontal direction in the drawing of the sound pressure type conversion element 1. There are
no problems with howling, etc. because of the presence.
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