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The present invention relates to audio transmission by performing a nausea conversion of a bone
conduction sound signal from the wall of the ear canal and performing sound transmission, and
also relates to an ear microphone that conducts the sound transmitted from an external receiver
to the ear canal. As this type of ear microphone, there has been no problem that it can be used
under external noise and that two-way communication can be performed with one ear by
integration with the sound conduit. That is, when used under noise, as a result of mechanical
acoustic coupling with an increase in the level of the audio signal passing through the sound
conduit, automatic transmission / reception switching by voice (VOX circuit is provided for twoway communication using a nest-carrier frequency The receiver's voice signal may cause the
transmitter to be switched to the transmitter, resulting in the need for manual switching, at least
one hand for communication, and two-way wired communication In a two-way call using two
carrier frequencies of a call and a radio, howling occurs with the increase of the received voice
signal level due to the mechanical acoustic coupling, and communication becomes impossible.
Therefore, the inventor noted that the energy of bone conduction voice vibration obtained from
the outer ear guiding wall is relatively large and the voice output signal of the ear microphone
does not significantly decrease even if the effective load weight of the ear microphone is around
several grams. The sound conduit is composed of a material having a large mass, and the sound
conduit is arranged via an elastic member so as to form an independent imaging system, so that
the vibration caused by the * p4 signal passing through the sound conduit is a conversion
element It is an object of the present invention to provide an ear microphone which solves the
problem caused by the transmission of the receiving side audio signal to the transmitting side at
the time of bidirectional communication. Next, the present invention will be clearly seen north
with the drawing on the side of the eyelid. The l is formed of a material that will be inserted into
the outer blanches of the listener, such as a lead-in-the-wall material such as a lead-in-a-place
cast or the like, and the outer part is covered with plastic $ II / '(2 There is. In addition, a true
through hole 1a and an insertion hole 1b are formed in the insert body l. , 3 is the seventh in the
sound conduit inserted and supported by the ring-shaped damper 41C by an elastic body such as
Gono, etc. in the U through hole la of the above-mentioned insert 1, * II M) dog by gold-pipe
Composed of 1 year old. One end of the groove a) sound conduit 3 is inserted at the end of the
insert 1 σ) ((opened 1: 1). 5 is fixed to the insertion body 1 of the insertion body 1 and 1h via
the push rod portion 5a. It is attached as the vibration to air conversion element such as -7-so
that the shooting direction is in the direction orthogonal to the sound conduit 3.
That is, assuming that the length of the piezoelectric element which is the conversion element 5
is l1 m, the width 1 tml, and the thickness 0.6 、, this piezoelectric element vibrates in the
thickness direction. Attach to position. In addition, 6 is a shield board. 7 is an elastic member
such as natural or synthetic rubber that covers the rear of the insert 1 described above, and an
empty space is formed in the center. A hole 8a is formed in the direction of the same plane as the
sound conduit 3 and the conversion element 5 as an outer body made of the same material as the
above-described insert 1 for covering the outer periphery of the elastic member 7 described
above. The bush 9 has been fitted. A metal pipe 10 is fitted to the bush 9, and the metal pipe 10
and the sound conduit 3 are connected by a chip 11. Further, the lead wire 5 b from the
conversion element 5 is inserted into the metal pipe 10 and is led out through the pipe 12. The
reference numeral 13 denotes a plastic shell covering the outer periphery of the outer body 8.
Although not shown, the pipe 12 connected to the sound conduit 3 is connected to the speaker in
the receiver, and the lead wire 5b is connected to the transmitter Of5. Next, the operation of the
above-described ear microphone will be described. When the user speaks now, bone conduction
voice m from the wall of the ear canal is transmitted to the insert 1 and transmitted to the
conversion element 5, where it is converted into an electrical signal and transmitted via the
transmitter 11-wire 5b. It is emitted as a radio wave from the first, anti →. By the way, the
vibration transmitted from the outside through the lead wire 5 b and the pipe 12 is absorbed by
an imaging system made of spring elasticity of the outer body 8, the lead wire 5 b, the damper
and the chip 11. In addition, the camera moves directly in front of the outer body 8 and is
absorbed by the imaging system of the insert 1 and the elastic member 7. In any of the above
cases, it is desirable that the resonance frequency of each resonance system outside the low
frequency range of the pseudo sensitivity frequency band (for example, 300 to 3300 H7, for
example) of the pseudomorphic element 5 is as follows. For this purpose, the weight of the insert
body 2 and the outer body 80 is large, and the elastic member 70 elastic system should be thick.
In particular, when the elastic member 70 has a large elastic coefficient, the effective II 4 load II
for the external auditory canal sound vibration of the conversion element 5 becomes
substantially only the insert 1, and the weight of the outer body 8 hardly affects the reduction of
the sound signal output. . On the other hand, an external signal received by the receiver is
converted into sound by the speaker, guided to the sound conduit 3 through the pipe 12, the
metal pipe 10 and the tube 11, and emitted into the ear canal. Here, the sound conductor 11r3 is
picked up by the vibrational energy of the sound passing through the sound pipe 3, but the
sound pipe for the photographing movement having a frequency higher than the resonance
frequency determined by the damper 4 and the sound conductor 1111. It is absorbed by the
vibration of 3 and is attenuated and transmitted out of the damper 4.
It is desirable that the upper frequency is also outside the low frequency range of the effective
sensitivity frequency band 変 換 of the conversion element 5. For this purpose, it is desirable that
the density of sound conduction 1iF5 is large and the elastic coefficient of the damper 1 is large.
Further, in the present embodiment, even if the image pickup movement from the sound conduit
3 is slightly leaked because the conversion element 5 is attached in such a direction that the
vibration direction of the conversion element 5 crosses the sound conduit 3 with respect to the
sound conduit 3. The conversion element 5 does not vibrate (and therefore does not switch to the
receiving side. In the above embodiment, the sound conduit 3 is a ring-shaped damper. The
elastic body may be filled with an elastic material in the entire space between and the through
holes 1a. Further, the speaker is not limited to an external one and may be built in. Furthermore,
in the present embodiment, the lead-out direction of the lead wire 5b is parallel to the vibration
direction of the conversion element 5, but the lead-out direction can be drawn in any direction
such as a direction orthogonal to the vibration direction. According to the present invention, as
described above, the insert inserted into the ear canal is provided with a photodynamic-electricity
conversion element such as a piezo element and a sound conduit connected to an external
speaker, and the sound conduit is made of 1ItWk dog material By using a sound conduit attached
to the insert via a damper, such as rubber, the vibration is absorbed even if the sound conduit
vibrates due to the voice taking kinetic energy from the external speaker, and it is absorbed by
the conversion element. Therefore, even in two-way communication with a single carrier
frequency, there is no possibility of switching to the transmitting side upon reception due to a
Brief description of the drawings
FIG. 1 shows an example of an ear microphone according to the present invention, FIG. 1 is a
cross-sectional view of the whole, and FIG. 2 is a cross-sectional view of the same taken along the
line n-tt.
DESCRIPTION OF SYMBOLS 1 ... insert 3 ... sound conduit 4 ... damper 5 ... conversion element 7
... elastic member 8 ... outer body% hitting applicant Katsuo Kamon
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