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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment
of the present invention. 1 ...... acoustoelectric transducer, 3 ...... sound receiving plate, 5 ...... ear
canal insertion part, 6 ...... soundproofing material, 8 .....・ Shield case.
[Detailed description of the invention] This device is used in the ear canal inserted earplugs! It
relates to l-v italo phone or U44 & ffi microphone and earphone. A reversible electro-acoustic
transducer, which can be used as a receiver for inputting an electrical signal to the electric circuit
and outputting acoustic vibration from the diaphragm, or the diaphragm +11 tact t / 〆2, ', It can
also be used as a receiver that receives vibration and outputs an electrical signal from the
electrical path. i Earplug-type handsets, so-called earphones formerly widely used, and earphones
O are many 40 belonging to reversible electro-acoustic transducers. It can be said that it is
known in the past to use the earphone as an earplug microphone or as a microphone four-phone
earphone. With the use of an earplug microphone, various effects can be obtained. That is, it is
not necessary to hold the microphone by hand or to clip it to clothes, and the activity of the
transmitter during the transmission becomes free. In the case of an earplug microphone, the
voice of the transmitter propagates through the internal structure of the head of the speaker and
reaches the receiving surface of the microphone from the ear canal, so even if noise is generated
in the noisy environment, the surrounding noise It is possible to convert the talker's voice into an
electrical signal without being compromised, and as the earphones block the ear canal so that the
surrounding noise does not reach the tympanic membrane, in noisy environments. I am used to
using it. As described above, earplug microphones have not been conventionally used despite
having various advantages. The reason why earplug microphones have not been put to practical
use is that all of the conventional earplug type reversible electroacoustic transducers are used as
microphones and have serious drawbacks in their performance when it is used. It is as follows
when the fault is enumerated. (B) The voice of the province #i has a considerable frequency
response until it reaches the ear canal by propagating the internal structure of the talker's head
and the attenuation has a remarkable frequency characteristic, but A plug microphone does not
have a function to compensate for this attenuation. (B) The sensitivity of the earplug microphone
is generally lower than that of other microphones IIA #. (C) The conventional earplug
microphone yc has a special soundproofing structure for the propagation path from the ear canal
to the sound receiving surface other than the sound transmission path, that is, the back direction
of the microphone and the sound propagation path from 111 m. Is not provided. 2.) The
conventional earplug microphone is not provided with a special shielding structure such as an
example for shielding electromagnetic noise t from the outside.
That is, such a conventional earplug-type icrophone can not be put to practical use, which is why
the conventional earplug-type microphone can not be used. This device is a conventional earplug
M! An object of the present invention is to provide an earplug-type eucrophone which can
eliminate all the above-mentioned drawbacks of the microphone and can be effectively used even
in a noisy environment or an electromagnetic noise location. Among the above-mentioned
drawbacks, it is more convenient to compensate by the design of the amplifier circuit which
amplifies its output than the improvement of the i biphone itself (al and i), and such
compensation in the amplification path is known in the prior art Although this explanation is
omitted, the gain of the h thermal amplification circuit is increased as a result of this
compensation, and it is necessary to further reduce the noise pickup by the round-earc
microphone. In the earplug microphone of this type, the increase in the gain of the amplifier
circuit is ineffective because the noise and electromagnetic noise have a big 'up' so much that the
device has been made to this point. Do. The drawing is a fragmentary view showing a further
example of the present invention (a drawing showing the earplug microphone of the present
invention enlarged by 2 to 2.5 times the actual size). In the figure, (1) is an electric blue sheet
reversible conversion element, and in the example shown in the figure, it is a thrust electronic
element, c 111% (2) is a piezoelectric element (11 electrodes ((3; a sound receiving board, ,
(Tran) form an electro-acoustic transducer element (11 of the customer equipment, shown in the
figure 1! In the embodiment, both are plastic containers, (5) is the ear canal insertion part, (7) is
a shield case and is made of an aluminum plate in the embodiment shown in the figure, and (6) is
a soundproof material and is the embodiment shown in the figure In this case, it is a compound
filled between a plastic container-car, a (roll) and a shield case (7). (8) is a coaxial cable and its
inner conductor (81) is 4kJllK connected, and the outer conductor (82) is connected to the shield
case (7) and the electric & I23. The inner conductor (81) C1 the other end is inputted to an
amplification circuit (not shown) and is grounded at the outer conductor (8a). The arrow (9)
indicates a path for sound introduction and movement, and the sound absorbing plate 1311-6
uses the soundproofing material 16) so that the blue tatami vibration from directions other than
the arrow I: 1 l t 9 + does not reach the sound receiving plate 131 . Since there is a sufficient
shielding against electromagnetic noise and external noise like 51 or more gates, a sufficiently
large signal-to-noise ratio can be obtained even when used in a large field of electromagnetic
noise and noise. In the case of using the conventional microphone of the hand-held type, the case
of using the earphone of the conventional structure as the earplug microphone, and the case of
using the earplug microphone of the present invention I was able to make a field magazine.
For example, while the speaker of a television system receiver or a radio receiver emits ordinary
valuable blue tatami, in the case of a telephone call by Fi conventional microphones, since the
titles from these television or radio are mixed, it is extremely difficult for the other party to
understand However, according to the earplug microphone of the present invention, the abovementioned sound from the television or radio was hardly mixed, and clear interaction was
possible. As is apparent from the above description, according to the present invention, a
microphone capable of sufficiently clear A 帖 even in an environment where electromagnetic
noise and / or M noise levels are large can be obtained, and, if necessary, this can be obtained.
(6) can also be used for force. Therefore, this design makes it possible to transmit without
interference from noise and other people's interaction, even at work sites where noise is loud,
and other people's interaction is conducted in the neighborhood, etc. It is possible to provide an
earplug microphone that is extremely effective for communication in an environment where
there is no public expense to be paid by the person with the expense of being used. In the
embodiment of FIG. 1, the shield case (7) is provided on the outside of the soundproofing
material (6), but the shield case is provided on the inside of the soundproofing material or the
shield case is on the inside and outside 11 of the soundproofing material. Needless to say, it is
possible to experimentally confirm the effectiveness of such an embodiment.
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