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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view, FIG. 2 is a rear view, and FIG. 3 is
a sectional view taken along line AA of FIG. 1 · · · · · · · · · · · · · 2, 2 '· · · · · · · · · · speaker mounting
flange, 3.3' · · · · · · uneven bulging portion, 4, 4 ' Sound hole. Bud J Fig. 1-Actual Opening 4914101 (2)
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
mounting plate or acoustic plate in a 4-channel stereo headphone. Recently, instead of 2-channel
stereos in the United States, 4-channel stereos have been increasingly used, and this is because
tL-by-t and 4-channel stereos can provide excellent reproduced sound with two senses of
presence. If this 4-channel stereo is reproduced by a normal speaker device, it can fully exhibit
its characteristics, but in the case of headphones, the sound effect is better than in the
conventional 2-channel stereo. The current situation is that there is no difference. This is because
when the playback performance of 4-channel stereo is performed by a normal speaker device, a
speaker device serving as a sound source is usually installed at four places of the listener's
circumference, so 7'L /) of each channel part is reproduced by each sound source. The
reproduced sound is well separated and directed and it is well matched as a whole, resulting in
the presence of warmth reproduced sound which is characteristic of 4 channel stereo, while it is
generally used now / J4 In the case of headphones for channel stereo, two speakers are stored in
each of the left and right speaker cases so that playback is performed for each channel bart 111.
Therefore, two speakers stored in one case are used. The directivity of the sound to be
reproduced is poor. As a result, the degree of separation of the sound to be reproduced is low 1
and 輯 −1Y. 1 'aA, aA, 1 m----------3 The listener is only able to feel a sense of separation on the
left and right. The purpose of this plan is to obtain a sound board t-which can give enough
degree of separation and directivity to the reproduced sound of each channel bart in the abovementioned point Kll, 4-channel stereophone. The configuration is such that the back of the platelike body of an appropriate shape is provided with a pair of symmetrical parts that are not
formed by a flange or the like so that two back and forth speakers and a pair of speakers are
attached. The mounting portion surface is appropriately expanded by contacting 91 [1 of the
speaker mounting portion, while the other 11 is expanded higher by a larger amount V5 than the
expansion portion to expand in a step-wise bulging manner to oppose each other. The formation
of an out portion and the provision of a sound release hole in the stepped portion directed to the
t1 in order to provide a sound emission hole 3 ° Next, one embodiment of the present invention
will be described with reference to the drawings 2, (1 ) Should be a nearly 橢 circular acoustic
plate Plate (21 (21 is in parallel contact with the back surface of the plate (1), nine flanges are
speaker mounting portions, (3) and (8) are flanges provided on the front side of the plate (21 (2+
In the bulging part, the bulging part (31L) (3al and the flange (2+ (2: on the other side of the
other side) on the side of 49-410 1- 04--1 where the flanges (2) and (2) contact) It consists of a
bulging part (+ to 3) (3 kl ') slightly higher than the bulging part (3al (3a')).
(3c) and (3c ') are stepped portions formed to face each other from the bulging portions (3'), (3a
') and (31) <36ic, and the sound release holes (4) (4) (3c) 4) is provided in the shape of a slit.
That is, the acoustic plate is formed by providing the plate body fl) K above (2) to (4). . Thus, the
acoustic plate of the present invention has flanges 121 f 21 K attached with speakers, and a
sound insulation plate for preventing acoustic interference between the speakers is interposed
between two speakers and used by being attached to a headphone case. The reproduced sound
from the speakers is irregularly reflected on the inner wall of the uneven bulged parts (3 & l, (3a
') and (3bl, (3b'l), but the sound emitting holes (4), (41 As a result of being provided at the
stepped part of the out part, the sound hitting the inner wall of the bulging part (3a), (3a ')
reaches the bulging part (3tl), (3b'l) having a larger space. , With the sound of the iron parts (3b),
(3b '), coming out of the sound emission hole (season, (4)). Therefore, for example, the
reproduction sound of the front and back channel bart on one side is given sufficient directivity
by the bulging part of the acoustic plate and is given H-5 at H 吟 time, and it comes out from the
opposite sound emission hole. Of course, the degree of separation before and after is also good,
but these sounds can be well matched in the space between the headphones and the ears formed
by the ear pad to obtain a very good sound effect. The present invention is as described above,
and it is possible to obtain an acoustic plate that has the effect of sufficiently improving the poor
sense of front and rear of the reproduced sound, which is a drawback of the conventional fourchannel stereo headphone. It is.
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