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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment
of the present invention. 1 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и ... 70 ииииииии Sheet metal, T1 иииииии Vacuum
cavity, 8, 9 ииииии Compound.
DETAILED DESCRIPTION OF THE INVENTION The present invention is an earplug microphone or
an earplug microphone / earphone that is used by being attached to the ear canal. As prior art of
this invention, the applicant of the present application filed June 28, 1977, and filed a large
utility model registration application Showa 5 pancreas (1) (-? -1 '? There is a 'st'y' Shin No.
08434T (hereinafter referred to as the prior application). An ear am receiver referred to as an
earphone has been widely used in the past, and most of the earphones are those belonging to a
reversible electro-acoustic transducer. The reversible electro-acoustic transducer mentioned here
can also be used as a receiver for inputting an electric signal to the electric circuit and outputting
acoustic vibration from the diaphragm, or inputting acoustic vibration to the diaphragm to
produce electric An electrical sound conversion device that can also be used as a microphone
that outputs an electrical signal from a circuit. When the earplug type earphone, which is such a
reversible electro-acoustic transducer, is used as a microphone, there is no need to hold the
microphone by hand or clip it to clothes, and the activity of the transmitter during transmission
is free. Become. In an earplug microphone, the speaker's voice propagates through the internal
structure of the speaker's four parts to reach the sound receiving surface of the microphone from
the ear canal, so even if noise is generated in a noisy environment, the surrounding noise There
is such an effect that the speech of the transmitter can be converted into an electric signal
without being canceled. (2) However, conventional earphones could not be used as earplug
microphones, so external noises were picked up or external electrical key sounds were combined
to provide a signal-to-noise ratio as a microphone. It was a decline. In the prior application, in
order to eliminate the above-mentioned drawbacks in the conventional ear ring microphone, the
acoustoelectric conversion element is bellowed by a good conductor of electricity, and the
acoustic wave passes through the ear canal. The signal-to-noise ratio of the earplug microphone
is improved by whitening with a soundproofing material that attenuates the acoustic vibration
well except for the part of the sound channel. In this invention, a vacuum cavity is used to
effectively attenuate the acoustic vibration that causes noise, and the drawings will be described
below. The drawing is a cross-sectional view showing an embodiment of the present invention,
which is shown in a size of about 2 to 2.5 times the size of the actual product. In the figure (? is
a receiving board, (2) is a coil, (3+ is! A reversible electric-tone tatami mat conversion element is
constructed of Ill, +21, and 131 K by Gnnet. The leads to the coil C) are not shown in the
drawing. (4) (41) indicates an ear canal insertion section; (5) indicates an air medium section
constituting an acoustic propagation path in the ear canal insertion section (41); and an arrow (6)
indicates an acoustic vibration passage.
(7) is a pupil whose outer periphery is constituted by a thin metal plate (70) and has a vacuum
cavity (71) inside, (81, t91 # i is a compound that well attenuates the acoustic vibration, it is
electric in the original body (7) The acoustic conversion elements 111, 121, and 131 are held.
Since the earplug microphone according to the present invention is structured as described
above, by grounding the thin metal plate (70), electromagnetic noise can be shielded similarly to
the prior application, and the vacuum cavity (71) It has been experimentally confirmed that the
external noise can be attenuated more effectively than the noise prevention material of the prior
application (the reference numeral (6) of the prior application). As described above, according to
the present invention, it is possible to obtain a microphone capable of clear communication even
in an environment with high electromagnetic noise and / or noise level.
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