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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional front view showing a
conventional 4-channel headphone, FIG. 2 is a side view of the main portion, FIG. 3 is a cross
section of the main portion, and FIG. Explanatory drawing which shows the principle of 4 channel
stereo, FIG. 5 is a front view of the principal part which shows one Example of 4 channel
heddophone of a wooden device, FIG. 6 is the same sectional drawing, FIG. It is a sound
absorption characteristic figure. 13 ...... acoustic plate, 14 ...... bass speaker, 15, 15 - - - - Medium-high range speaker, 18 ...... ear pads, 19, 20 ... .. Sound insulation wall, 21 ..... Case 0
[Detailed description of the invention] The present invention relates to 3D system 4 channels
which contain 3 speakers in the left and right cases, ie, 1 bass speaker and 2 treble speakers, and
2) in particular. %, Speaker for sound ♂ Z-ゐ? It is intended to make it possible to reproduce the
sound field effect of a superior 4-channel stereo system with good separation of the sound of-'/
2. A conventional 4-channel headphone has been configured as shown in FIGS. That is, two front
and rear speakers 2 ° 3 are attached to the acoustic plate 1, the case 4 is covered on the back of
the acoustic plate 1, and a peripheral edge of the front surface; This is combined with the head
band 6 to form a 4-channel headphone. In this configuration, only the speakers corresponding to
the number of channels are provided, and even if the separation of the left and right sounds is
performed, the separation of the front and back sounds is not taken into consideration at all, and
reproduction of a true four channel stereo It was impossible. That is, as shown in FIG. 4 as the
original form of the 4-channel stereo, − ′ ′ ′ ′ ′ ′ ′ ′ 8, 9, 10 ′ ′ ′ ′, 1 j are
disposed, and the respective sound sources The sound is separated-enters the ear 12 of the
listener 7 in the form of "3", and the sound before and after the left and right 9 is distinguished
to satisfy the sense of presence. However, in the conventional 4-channel heddophone as
described above, it is almost impossible to distinguish between the front and back sounds, and it
is not possible to reproduce true 4-channel stereo. The present invention eliminates the abovementioned conventional drawbacks. Hereinafter, the present invention will be described with
reference to FIGS. 5 to 7 of one embodiment. The reference numeral 13 designates an acoustic
plate made of metal or synthetic resin. A bass speaker 14 is directly attached to the center of the
rear surface O of the acoustic plate 13. Is directly attached. And many small holes 17 for sound
emission are formed in the acoustic board 13 which attached each of these speakers 14-16. In
addition, the acoustic plate 13 is bent at the attachment portion □ \ 4 of the high temperature
speaker 16.16 with respect to the attachment portion − of the low frequency speaker 14 so that
the sound radiation axis of the medium high / high sound speaker 15.16 is I'm supposed to leave
the listener. 1, an ear pad 718 is attached to the periphery of the acoustic plate 130, and the ear
pad 18 is formed by putting a soft foam material such as urethane foam inside, and wrapping the
outside with a vini-resresser etc. ing.
This is to cut off the internal and external sounds and to get a good feeling of wearing.
Furthermore, a foam polyurethane having open cells at the front of the acoustic plate 13 at the
boundary between the small sound emission holes 17 of the bass speaker 14 and the small
sound emission holes 17 of the middle and high pitch speakers 15 and 16 before and after. A
sound insulation wall 19.20 is provided which is made of foam, is low-pitched and permeable,
high-pitched and sound-absorbing. The sound insulation wall 19 ° 2 o: The space formed by the
above-mentioned ear pads 18 is separated into three, and the effect is set lower than that of the
ear pads 18. 5) A case 21 made of synthetic resin or the like is covered on the back surface of the
acoustic plate 13 so as to constitute one headphone unit 1, and the case 21 has a hanger 23
coupled to the head band 22. The head hunts 22 are bonded and the head hunts 22 are covered.
In order to improve the separation of sounds before and after 1 as a technical background with
such a configuration, it is necessary to position the front and rear speakers apart, and in the free
sound field, humans perceive the sense of direction of the front and back sounds. What can be
done is that the wavelength is 5 to 6 KHz or more at short, high river numbers. 9 Because of this,
in the present study, a bass speaker 14 is disposed at the center, and middle and high-tone midhigh speakers 5.16 are disposed before and after the bass speaker 14. In addition, a sound
transmitting high sound absorbing a single wall 19.20 is provided between the sound emitting
surface of the bass speaker 14 and the sound emitting surface of the middle-high-tone speaker
5.16, so that the sound in the high- and low-pitch range is provided. Are configured not to cross
each other until they enter the listener's ear hearing path. Actually before,) 6). The sound of the
rear middle / high-pitched speaker 15.16 is emitted from the small hole 17 for sound emission,
passes through the space formed by the sound insulation wall 19.20 and the ear pad 18, and
passes over the sound insulation wall 19.20 to reach the listener's ear. . That is, the trebles of the
front and back channels are separated. FIG. 7 shows the sound absorption characteristics of the
open-cell maltobrene having a material thickness of 101III. The sound absorption properties are
changed by changing the expansion ratio, thickness and density of the material. As described
above, the four channels of the present invention has a sound insulation wall on the sound
emitting surface of the medium and high-tone speaker before and after the sound board and the
low-pitched speaker, and therefore the separation of the sound before and after 1 This is
significantly improved until the listener enters the hearing of the listener's ear, and the
reproduction of a true 4 channel / channel stereo becomes a huge one, and this sound insulation
wall separates the sound absorbing wall and the acoustic plate, the ear pad The resonance
phenomenon in the inner space does not occur, and the headphone becomes extremely easy to
hear, and the listener 7 does not get tired from the listener even in long-term use, and it is
effective to have excellent wearing feeling. It is of great practical value.