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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a four-channel stereo phone
according to the present invention, FIG. 2 is a cross-sectional view taken along the center line of
FIG. It is a disassembled perspective view of FIG. Explanation of major drawing numbers, 1 ... Unit
case, 2 ... Ear pads, 3, 4, 4 '... Sound elements (speakers), γ ... Filled object. Shame 11 side-51 real
opening Sho 48-78123 (2) 頌 Z) sentence-52
DETAILED DESCRIPTION OF THE INVENTION The in-situ bulk relates to a head V phon structure
for a 44-panel stereo. A 4-channel stereo headphone is equipped with sounding elements such as
a pair of left and right uni) cases, respectively ec, 1111 and speakers for the back side, so 4878123-022, so each sounding element is a front left signal, front right Although it is intended to
reproduce the four original sounds of the signal, the left rear signal and the rear right signal to
obtain a fine sense of presence in the venue, only two sound elements in a limited volume If the
sound output from each of the sounding elements is mixed, there is no great difference from the
sound reproduced by the only sounding element, and the sound quality deterioration due to the
mutual interference of sound waves can not be avoided. In consideration of the above points, the
present invention is capable of faithfully reproducing the sound effects of the 4-channel stereo to
the dophone in order to prevent interference between the front sound and the rear sound and to
improve the sound quality while improving the separation. The present invention will be
described with reference to the drawings based on an embodiment of the present invention K.
FIG. 1 is an embodiment of the present invention. Fig. 2 is a front view showing one ear of the
dophone, Fig. 2 is a cross-sectional view taken along the line AA 'of Fig. 1, Fig. 3 is an exploded
perspective view of a headphone according to an embodiment of the present invention. The same
48-78123- 333 k is the same number. In the figure, (1) is a unit case, (2) is an ear pad (ear pad),
(3) (4) (4 ') is a lid and a plug made of a breathable member such as a polyurethane, Are
styrofoam and other resins. A lightweight, sound-absorbing packing made of paper, metal or the
like, having two caves (5), (5 ') inside it. (6) and (61) are mounted on the inside or the bottom of
the single cavity (5) or (5 ') with the open end directed to the front of the speaker (61, (6')) An
appropriate space is provided between the lower surfaces of the plugs (4) and (4 '). The filler (7)
and the unit case (i have sufficient adhesion between them and the unit case 1) have a structure
such that they do not resonate. In order to improve frequency characteristics and obtain
optimum sound quality, it is possible to expand the shape of the cavities (5) and (5 ') conically
toward its open end and conversely narrow the aperture. The distance between the bottom
surface (b) and the top surface (a) 48-78123-04 of the hole (5), (5 ') by adjusting the mounting
position of the speakers (6) and (61) It is possible to change bIL and 1 ° to bl arbitrarily.
In addition, the plug A 等 ピ g ピ i i of the 55th class is good for adjusting the frequency
characteristics, the material may be changed or 55 may be excluded. The woodwork is
characterized by the above-mentioned structures, in particular, the caverns (5) and (5 '), and its
function and effect are: ** (7 Nc properly spaced two caverns (5) and (5') Speakers (6) and (6 ')
provided at arbitrary positions or positions between depths ah and n1 to b1 of the cave and a
material having a material such as a poly- By covering, it prevents the radiated sound wave from
spreading to the surroundings, and improves the difference of the sound wave, l !! Control of air
vibration inside the cavity (5) and (51) by placement and plugs (3), (4), and (41) of busy
polysomes, etc. At the same time, the mutual interference can be reduced as much as possible,
and + separation and sound quality improvement can be achieved. The two holes (5) and (5 ')
possessed by the filler 4B-78123-05 (7) equipped with the speakers (6) and (61) also act as
horns to enhance the bass range. Also have a useful role. The present invention provides a very
separable sound quality good 4 + yannel stereo headphones, and it is said that the inter-structure
J! It has features that can be made compact, lightweight, and inexpensive at one.
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