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JPS5352401

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DESCRIPTION JPS5352401
Description of the Invention 9 Name of the Invention Headphones (1) A head phone C
incorporating an electromagnetic or electrostatic speaker, and a through hole at the central
position of the magnetic circuit or fixed electrode of the above-mentioned speaker facing the
outer ear. The headphone is characterized in that the reflection coefficient at the center of the tspeaker from the entrance of the ear canal is smaller than the reflection coefficient at its
periphery.
2, the scope of claims
8. Detailed Description of the Invention The present invention relates to the improvement 5 of
headphones; 64 conventional headphones are always provided with a diaphragm for sound wave
reproduction and a device for driving the same at the front of the entrance of the ear canal. For
example, in the movie gouley shape C two six i, a straight line circuit with a daytime slit t--is
arranged on the front face of the ear canal population, and in a flat drive type a strip or
perforated magnet is on the front face of the ear canal entrance It is arranged. In the case of the
1-fc electrostatic type, a holed plate as a fixed electrode is disposed in front of the entrance of the
ear canal (:: in the pond of the diaphragm for sound wave reproduction). Thus, in each case a
solid reflector is placed in front of the entrance to the ear canal. Therefore, when wearing
headphones, the sound compression feeling when worn, the shield layer is To, 0, and the
reflected sound from the ear canal is reflected again to make it an incident sound to the ear 9 to
produce reverberation, and the head becomes louder when this reverberation becomes large
Internal localization starts and the sense of localization of the sound source disappears. This E!
Ari external ear canal from the entrance of the ear canal When the reflection coefficient does not
wear headphones, ie, the free sound field 1; placed closer to a friend state, the influence of the
ear canal resonance is reduced and the reproduction sound outside the head is localized It is an
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object of the present invention to provide a headphone which is characterized in that it is
possible to obtain a shield layer and to make it possible to eliminate a shielding layer and an
acoustic pressure sensation t-. Embodiments of the invention will be described by means of the
drawings. ,? In Fig. 1 and Fig. 2 /, the face of the ear canal / EndPage: 1 A yoke with a cylindrical
commuter 1 at the center, 3 is a permanent magnet, and the drive unit is composed of 15 mm or
more Open and the magnetic circuit center is located at the entrance of the ear canal. Hiro is a
diaphragm, and is made of a thin plastic film C2 which has good sound permeability C2. S is the
inner circumference (bifurcated ear pad. The through hole c may be a right cylinder (a conical
shape or the like c to change the face of the IF r). In addition, it may be filled with through hole
inside ? 2 sound absorbing material (not shown). FIG. 3 shows another embodiment of the
present invention, in which the outer periphery of the hole / a is formed on the inside of the yoke
1 (a magnet 6t-provided .tau. Directly formed diaphragm ? aft provided, so that the population
of the ear canal (do not shield the through hole ? ? facing the counter with the diaphragm ? a
(= ?, the through hole ((= sound absorbing material 71 is filled with a charge resistance material,
t And t is a heat retaining net having a sufficiently small reflection coefficient. The other
configuration is the same as that of the above embodiment. FIG. 4 shows still another
embodiment of the present invention, in which magnets 6a and 6b are provided on the outer
periphery of the holes / a and a'a, facing the inside of the outer yoke / t inner noble yoke t. And a
diaphragm d is provided between the magnets 6a and 6b so as to shield the member between the
magnets 6a and 6b, and the sound absorbing material 7 is filled on the outside of the diaphragm
1) in the continuous chamber 2). The other configuration is the same as that of the above
embodiment.
When an electrostatic speaker is used, the fixed electrode to be used may be in the form of a ring
having an opening of about 15 mm or more at its center, and the diaphragm may not necessarily
be in the form of a ring. ?????????? The id-breathable material is preferred, but it
need not be. Although the back Wi of the peristaltic plate da F 'al da b may be of a closed type, it
is preferable to use a back open type in which a part of sound is leaked to the outside using a
resistance element. As is apparent from the above, according to the present invention, a solid
sound reflector having a reflection coefficient close to 1 is not disposed facing the entrance of
the ear canal, so that the reflection coefficient seen from the outside of the ear canal entrance is
free sound A place put in place. Since the influence of the ear canal resonance is reduced, it is
possible to obtain reproduction sound of localization outside the head and to obtain the same
effect as listening in a free sound field in headphone reproduction. In addition, there is an
advantage such as being able to eliminate the sense of shielding and the sense of acoustic
pressure.
4. Brief Description of the Drawings Fig. 1 is a plan view of a headphone according to the present
invention, Fig. 12 is a cross-sectional view thereof, and Fig. 3 and Fig. 4 are cross-sectional views
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showing other embodiments of the present invention. t иии Yoke, Ko и и и и и и и и и и и и и и и и и и и. pb:
diaphragm, 5: ear pad, 'r'ar / sb: magnet, 7: sound absorbing material, j: heat retention net. Patent
Assignee Pioneer Corporation ?-Shijimu J ? U 4 4 ? EndPage: ?
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