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DESCRIPTION JPS52138727

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DESCRIPTION JPS52138727
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a conventional
loudspeaker type mutual communication device, FIG. 2 is a side view thereof, FIG. 3 is a sectional
view thereof, and FIG. 4 is a cross- FIG. 2 is a cross-sectional side view of the loudspeaker type
intercomp apparatus. 1 ... upper lid, 2 ... lower lid, 3 loudspeaker, 4 ... ... microphone, 5 ...
microphone unit, 6 ... ... Slit, 8 ... Mating part.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a
loudspeaker type intercom system for accommodating a microphone and a speaker. Now, as
shown in Fig. 1 and Fig. 2, when a 1 d 11 c speaker 3 and a microphone 4 t - are provided on a
donation consisting of the upper 11 and the lower 1 to 2, and ff- radiates from this speaker a, it
is radiated from behind the speaker 3 Muzzle inside the cabinet, creating a considerable large
sound pressure. Physically 60 - 60 a + 1 ahead of the stile loudspeaker S 70 dB 8 P 1 j F) f * l
When inside the enclosure is 90 to 11 c) dB 3 pL diagnosis 5. It has sound pressure of + 2 / ♂ I,
222. Incidentally, as an acoustic condition of such a device, it can be said that the sound pressure
which is picked up by the microphone 4 from the speaker 3 must be small. For this reason, the
microphone 4 is surrounded by aluminum, AB8 resin or the like to form a unit, and the sound
pressure of 90 to 11oci BspL in the housing is insulated. However, usually two piece or three
piece specimen has a fitting part, which is often in the vicinity of 1 choku. In this case, the inside
of the enclosure will reach the front of the microphone all the way. The path is shown in FIG. 3, 6
is a microphone unit, 6 is a slit, and 7 is a fitting portion. It is quite difficult to make this
clearance of the beasts zero, and it is useless to isolate the sound pressure inside the body
against the microphone unit 6 at all. The present invention is designed to make it possible to
reduce as much sound as possible through the clearance of the above-mentioned beasts. FIG. 4
shows the relationship between the front fitting ga closest to the microphone 4 of the present
invention and the LIIKL agreeable area 3), that is, because the acoustic impedance at the fitting
portion Km can be increased , The sound pressure inside the chassis to be procured can be
23-09-2018
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reduced. Old Harima, the mating part tLWIK is often used, but this is only for closely engaging
the engagement, KL, to prevent misalignment, the entire fitting part is often made LW or
unevenness of 1 or less in height . As described above, it is possible to reduce the sound pressure
reaching from the inside of the housing to the microphone from K, which is extremely
advantageous in practical use.
23-09-2018
2
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