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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view showing an
example of the structure of a conventional earphone, FIG. 2 is a schematic sectional view
showing one embodiment of the present invention, and FIG. 3 is an ear shown in FIG. The
schematic sectional drawing which shows the state which inserted and attached the plug-type
microphone to the ear canal. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · magnetic
cylinder, coil, 8 · · · metal cylindrical member, 9 · · · sound insulation member ...... ear canal, yet
each figure in the same symbols indicate Tsukasa portion.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earplug
microphone or a rethrowing microphone / earphone used for insertion into the ear canal. Ear i &
-type handsets, referred to as earphones, are widely used in the prior art, and many of the
earphones belong to reversible electro-acoustic transducers. FIG. 1 is a schematic sectional view
showing an example of the structure of a conventional earphone, where +1) is a diaphragm, +21
is a magnetic circuit, +3: a coil, and (4: an ear canal insertion portion +5) is an ear canal insertion
portion An air medium portion constituting an acoustic propagation path in +41, an arrow +61
indicates an acoustic vibration passage, and (7) indicates a mantle. The earphone shown in FIG. 1
is an electromagnetic type reversible electro-acoustic transducer, which can be used as a receiver
for inputting an electric signal to a coil G) and outputting an acoustic vibration 12 + a from the
vibration 1jil +, and its diaphragm It can also be used as a microphone for inputting a virgin
vibration to (1) and outputting an electric signal from the coil 2. If you use such an earplug-type
earphone as a microphone, you must hold the microphone by hand or clip it to your clothes! !
There is an advantage that there is no longer being there, and that the activity of the talker in the
air 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 sound receiving surface
of the microphone from the ear canal. It has the advantage of not being defeated. Despite these
advantages, conventional earphones have not been put to practical use as ear ring microphones.
The reason is that in the structure as shown in FIG. 1, external noise is picked up or external
electromagnetic noise is combined to reduce the signal to noise ratio as a microphone. This
device aims to eliminate the above-mentioned drawbacks of conventional earphones ■, just in
case, 淋 ′ ′ ′. The simple structure prevents external noise from reaching the diaphragm and
external electromagnetic noise does not occur in electricity. An embodiment of the invention will
now be described with reference to the drawings in which it is not coupled to an acoustic
transducer circuit. FIG. 2 is a schematic cross-sectional view showing an embodiment of the
present invention, wherein 111, 121, 431, 161 are parts corresponding to the same reference
numerals in FIG. 1, and +81 is a metal cylindrical member (υ, +21 , 131 is provided as a surface
KIi of the sound receiving surface of the acoustoelectric conversion element and a surface
opposite to the sound receiving surface. It is convenient for the member (5) to be integrated with
the magnetic circuit 12+ to form a part of the magnetic circuit, but it is convenient that the book
is not limited to such a structure. Even blindness is that it can be used uniformly.
Also, the member +8) is normally connected to the ground potential KIl to effectively bell-cover
the external electromagnetic field, but grounding the member 1g + is not an essential
requirement of the present invention, the portion indicated by the reference numeral (9) is 111 ,
121, 131 and 11 together as a soundproof member as shown in the figure except for the sound
receiving surface, for example, a rubber thread is wound around and a suitable cover is selected.
It is configured by The portion (91) of the soundproof member (9) is finished to an outside
diameter suitable for insertion into the ear canal (although FIG. 2 is shown enlarged from the
actual size), (911) The part shows the necessary thickness in the axial direction of the member
{circle over (3)} so that the necessary soundproofing effect can be obtained, and the part (93)
shows the end protecting part of the wire of the coil (2). Fig. 3 is a schematic cross-sectional view
showing a state in which the ear am microphone shown in Fig. 2 is inserted into the external ear
canal, the same reference numerals as in Fig. 2 indicate the same parts, (至) is the outer ear, aυ
is the external ear canal, az is Indicates the tympanic membrane. Earplug type of this device!
Since the icrophone has the above-mentioned structure φ, external noises reach the portion (92)
K of the soundproof member 19+ from the direction of the outer ear ago and are sufficiently
attenuated by the soundproof member, and the soundproof member +9) and metal circle Since
there is a noticeable difference in the speed of sound wave propagation with the columnar
member 181, it is effectively reflected at its boundary, and the sensitivity to convert external
noise into an electrical signal becomes extremely low. Furthermore, as compared with the
conventional earphone shown in FIG. 1, it is possible to effectively pick up the sound from the
portion of the ear canal 1110 as long as there is no air medium portion 1. Also, when the earplug
W microphone of this invention shown in FIG. 2 is used as an earphone, the performance is
improved compared to the conventional earphone because the positional relationship between
the diaphragm ( and the tympanic membrane Q21 of FIG. It will be clear if you look at it. As
described above, according to the present invention, it is possible to obtain a microphone capable
of clear communication even in an environment with a large ambient noise level.
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