JPS5561198

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DESCRIPTION JPS5561198
Description 1, title of the invention
Electro-acoustic interconverter
3. Detailed Description of the Invention The present invention relates to an electro-acoustic
intertransducer, and more particularly to an electro-acoustic intertransducer using a sound
pressure transducer and a vibration pickup transducer. As an electro-acoustic transducer, there is
an earphone etc. which converts an electric signal into sound pressure and transmits it to an
eardrum, while an ear microphone etc. which detects vibration in the ear canal and converts it
into an electric signal as an acoustic-electric transducer. is there. This ear microphone is 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 using a piezoelectric element and converts it directly into an electric
signal. In recent years, the utilization rate of the vibration pick-up type ear microphone has been
increased as a sufficient noise suppression in the outside world. In addition, you can talk while
using both hands for work in high noise such as construction site, and you can talk with only one
ear so that information on the maintenance and safety measures can be entered. 2-EndPage: One
earphone and one ear microphone An electrical four acoustic interconverter having both
functions has been devised. For example, a conventional acoustic-electrical interconverter having
both earphone and ear microphone functions includes a sound pressure type conversion element,
which converts an electric signal to sound pressure, and a piezoelectric element, which converts
vibration to an electric signal. In addition, when using a piezoelectric element, in general, the
element such as a high lance is directly connected to the piezoelectric element, which makes the
operation difficult and makes it vulnerable to vibration, impact, etc. Fell. The object of the present
invention is to provide an electro-acoustic interconverter which overcomes the above-mentioned
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drawbacks. The invention will now be described in detail with reference to the accompanying
drawings: FIG. 1 is a cross-sectional view of a 3-one embodiment of an electro-acoustic
interconverter according to the invention. In the figure, the case 1 has a through hole 2 for
introducing sound pressure and has a sound pressure introducing portion 3 and an element
accommodating portion 4 which can be inserted into the ear canal. It has become. In the element
storage unit 4, for example, a sound pressure type conversion element 5 as a first conversion
element for converting an electric signal into sound pressure is stored. On the other hand, in the
sound pressure introducing portion 30 through hole 2, for example, a piezoelectric element 6 as
a second conversion element for converting vibration into an electric signal is provided.
Reference numeral 7 denotes one of a group of elements constituting an impedance conversion
circuit or the like connected to the output end of the piezoelectric element 6 for performing
impedance conversion, for example, an FET (field effect transistor), which is provided in the
element storage portion 4 It is attached to a small and thin printed circuit board 8.
The printed circuit board 8 has a hole 9 for communicating the side of the element housing 4 on
which the sound pressure type conversion element 5 is disposed and the through hole 2 side,
that is, for passing the sound pressure. Further, by using a double-sided printed circuit board as
the printed circuit board 8, the degree of integration of the element groups constituting the
impedance conversion circuit and the like is improved, so that the shape can be miniaturized. The
printed circuit board 8 supports, for example, an end portion serving as an output end of the
piezoelectric element 6 in order to also serve as a support member of the piezoelectric element 6
provided in the through hole 2. Then, as shown in FIG. 2, for example, the through hole 10f is
formed in the printed circuit board 8 and the terminal end of the piezoelectric element 6 is
inserted and fixed in the through hole 10, so that the output end of the piezoelectric element 6
and the innodance conversion circuit are patterned. That is, since the connection is made via the
conductor 11, the connection work using the lead wire can be omitted. The coder is connected to
the output end of the innobiance conversion circuit configured on the printed circuit board 8 as
described above, and the output thereof is supplied to, for example, an amplifier incorporated in
a transmitter (not shown) and, for example, a receiver not shown. To the sound pressure type
conversion element 5. By inserting the thus-constructed electroacoustic transducer into the ear
canal, the tip of the sound pressure introducing unit 3 contacts the wall of the ear canal, that is,
the bone portion of the ear canal. In this state, when the bone vibrates due to voice, the case 715
moves up and down, and a force proportional to the acceleration of the vibration is applied to the
piezoelectric element 6 so that the piezoelectric element 6 generates an output proportional to
the force. This output is subjected to inno- ance conversion in the above-mentioned impedance
conversion circuit and then supplied to an amplifier (not shown) via the load 12. On the other
hand, an electrical signal supplied from, for example, a receiver via the cord 12 is converted to a
sound pressure by the sound pressure type conversion element 5, and this sound pressure
passes through the hole 9 of the printed circuit board 8 and the through hole 2 It is transmitted
to the tympanic membrane. In the above embodiment, the sound pressure type conversion
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element 5 is used as the electro-acoustic conversion element (earphone), and the piezoelectric
element 6 is used as the acousto-electric conversion element (ear microphone). It is also possible
to use 1 as an acousto-electrical conversion element and the piezoelectric element 6 as an
electro-acoustic conversion element. As described above in detail, by using the printed circuit
board 8, each circuit element and piezoelectric element can be incorporated into the case 1 after
attaching them to the printed circuit board 8, and the soldering can be completed completely.
The front stop can be achieved and the one that is strong against vibration, impact and the like is
obtained as 6 to 1 EndPage: 2.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view of an embodiment of the
electro-acoustic intertransducer according to the present invention, and FIG. 2 is a cross-sectional
view of an example of a joint between a piezoelectric element and a printed circuit board.
Explanation of symbols of main parts l ································································· Element storage unit 5 ·····
.... sound pressure type transducer 6 ......... piezoelectric element 8 ........ PCB applicant Pioneer
Attorney Attorney Motohiko Fujimura 7- flora 1 Zu菓 2 da EndPage: 3
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