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TECHNICAL FIELD The present invention relates to a small headphone suitable for listening to,
for example, a cassette tape player, a portable radio, a communicator and the like. Configuration
of the prior art and its problems In the conventional headphone, the surface of the housing that
houses the speaker portion is close to the entrance surface, and all around the housing before
and after, in order to prevent leakage by snaking evenly around the ear 8 (ear pin) It requires a
device that can be tilted to the structure-F. In the conventional headphone shown in FIG. 1, 1 is a
headphone unit (not shown), which is fully enclosed, 2 is a ventilated one which covers the front
surface of the housing 1-a porous cloth Or it is a plastic ear pad. Spherical i?1 mounted on the
rear of the 3-part housing. Reference numeral 4 is a cut-in portion provided in a part thereof. 6-] и
и и Holder of the housing% 6 is a ball 4 (provided in the recess, 7 is a headband, 8 is provided in
the holder 5 guide hole for sliding the headband 7, 9 times-1 The stopper 7 is provided at one
end of the sleeve 7 so that the head 7 is not pulled out of the guide hole 8. In the configuration of
the two-follower, the spherical portion 3 directly connected to the housing 1 can freely turn back
and forth -1- while pressing the inner surface thereof in the spherical recess 6 of the holder 6 by
the elasticity of the cut portion 4 . K having a spherical portion 3 and a spherical four portion 6
as described in 1 has a disadvantage that the die and the like become removable 1 and
expensive. (1) Since what is pressed in elastically can be taken out by pulling it, if the holder and
the housing are connected by the input cord 1a, the input cord 1a will be unreasonable if the
spherical part 3 comes out of the spherical four part 6, There is also a disadvantage that there is
a risk of disconnection. Also, when a headband is attached to a so-called inner type hesodophone
that has a housing with a diameter of about 10 to 20 and is inserted into the ear shell for
listening, wearing feeling is not good even with the above movable device There was also a
problem that there was a sense of discomfort in the auricle. SUMMARY OF THE INVENTION The
present invention solves the problems of the prior art, and it makes the feeling of wearing in the
auricle or the auricle all the better, lessens the sound leakage, and improves the frequency
characteristic as well as the structural simplification. The purpose is to provide headphones.
SUMMARY OF THE INVENTION The present invention forms the housing to be contained in the
speaker unit of the headphone into a substantially spherical or substantially hemispherical shape
so that the direction of the front sound emission hole is directed to the direction of the external
ear canal The front sound emission hole is formed, and a baffle plate metal of acoustic resistance
smaller than the acoustic resistance of the front sound emission hole is provided immediately
before the diaphragm of the speaker unit. Can provide all the headphones.
Description of the embodiment Fig. 2 is a front view of an embodiment of the present invention,
and Fig. 3 is a cross-sectional view of the main part. 1 to и и и и и и и и и Udging is different from the
conventional example of Figure 1 in that it is approximately spherical (diameter is about 10 ~ 18
mm). The holder 5 is directly connected to the housing 1 without the movable device. 10:
speaker unit% 11-1: diaphragm thereof 12: housing 10011 surface sound hole 13: rear face
piece hole 14: pno / nda mounting hole 16: bushing 17 16: input cord 17: diaphragm 1) 1 (1)
Gutter space 1915.18 is a front baffle plate, and its 19 g holes. Next, to explain the operation,
slide the headband 7 under the holder 6 'x l and align the housing J + 14 so that the housing is in
the proper position for +1: <, and then adjust the elasticity of the headband 7 The housing 1 is
used to be stably stored in the auricle. The front sound hole 12 is provided so as to face in the
direction of the outer ear hole in this mounted state. By doing so, the front sound hole 12 is
pressed against the wall in the auricle, sound emission is blocked and it is prevented that
sufficient sound pressure is not applied to the ear canal. If the center of the diaphragm 11 of the
unit 10 is aligned with the center of the front sound hole 12, the above effect is further assisted.
Furthermore, a rear surface sound hole 1st is provided on the rear surface opposite to the front
surface sound hole 12 of the housing 1 as necessary to adjust frequency characteristics and
sound quality. The ear pad 2 is not necessarily required, and the surface of the housing 1 may be
formed of smooth metal, plastic, or soft plastic. Alternatively, the surface treatment or coloring
process such as imitation pearls may be performed to create a nacreous atmosphere of
accessories. If there are no earbuds, the front sound holes 12 or the back sound holes 130 are
made extremely small, or they are shown in FIG. 4 on the outer surface or the inner surface, to
prevent external dust and the like from entering. It is also possible to stick a cloth or a plastic
material 20 of porous 11 or the like. The substantially spherical shape described in -1- means
that the size of the housing is L6, and the case where the 41111 cross section has an oval shape
is also included 7'L. Here, when the function of the front baffle plate 18 in FIG. 3 and FIG. 4 is
explained, if the volume of the front part of the diaphragm 110 between the front part 3) 3 is
large, one characteristic cow is generated in the frequency characteristics and the sound quality
is deteriorated. There is something to do. -7 The baffle plate 18 which makes all the sound holes
19 as close as possible to the diaphragm 11 is provided. The hole diameter of each of the sound
holes 19. The position, the number, etc. are determined so that the frequency custom-made
becomes optimum, but since it is a hole provided in the plate, the open 1.1 = Jl?, and the e-
prone against the sound pressure radiated from the diaphragm Produces an i 'reluctance
On the other hand, 1 '+ il noise hole 2 of the housing 1 is better than the sound hole 19 of the
baffle plate 18 to improve opening II' or increase the hole diameter, etc. 1 :? The sound volume
of t + '+: k i' + i J face pan full board 18 '; the air volume of the front is not inside the ear shell (by
integrating with the air volume inside the ear canal 7) It is intended to prevent all the problems
of the system. FIG. 6 shows an example in which a soft air-permeable foamed plastic material or a
fibrous material is inserted into the front surface of the baffle plate in the housing 1 to further
reduce the influence of the internal air volume. Fig. 6 shows that 1) a soft air-permeable plastic
foam or fiber material is attached to the inner surface of the housing 1 or 1) 11 side of the baffle
plate 18 or an adhesive is applied. This is an example in which an adverse effect such as
reflection of sound on the inner surface is mitigated by coating by a method such as spraying or
electrodeposition. FIG. 7 shows an embodiment in the case where the diameter of the housing 1
is about 20 to 3 Q mm, in which a part of the housing is inside the auricle and most of it is
outside. In this case, if the housing is approximately spherical, the entire volume is too thick and
it is not necessary. Therefore, the hemispherical shape is used, and the position of the front
sound hole is not toward the periphery of the ear shell toward the ear canal It is preferable to
provide in the direction in which the sound pressure energy is sufficiently applied. Also in this
case, the ear pad 2 may be added to the surface of the housing 1 or not. FIG. 8 shows still
another embodiment, and the holder 5 is not particularly specified. A guide hole 8.8??z is
provided to let the headband 7 pass through the zink 1. In any of the above-described
embodiments, the holder 6 or the housing 1 slides on the head band 7 with excessive rigidity,
although not shown, for example, using a metal or plastic spring or the like. In some cases. A
conventional mechanism such as a stepped mechanism that produces a click feeling can be used.
Effect of the Invention The present invention is the case where the shape of the housing
completely contained in the speaker unit is close to one spherical in a small housing, and in a
slightly large housing. At least it has a nearly hemispherical shape J: soot, especially when the
direction of the housing is made to move one inch according to the direction of the ear shell (14 A well-dressed feeling is good, and a one-dimensional hill echo energy can be effectively radiated
toward the external ear canal, and the deterioration of the hill quality by the air volume in front
of the diaphragm is prevented at 'I' and 'j- It is possible to realize a headphone having an
excellent cow beard.
Brief description of the drawings
1 is a front view of an essential part of a conventional headphone, FIG. 2 is a front view of an
embodiment of the present invention, FIG. 3 is a cross-sectional view of the main part of this
embodiment, and FIG. FIGS. 6 and 6 are main part cross-sectional views of another embodiment,
and FIGS. 7 and 8 are side views of main parts of still another embodiment.
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и head recess, и и и и ----- stopper% 1o ...... speaker unit, 12 ..... frontside sound hole, 13 ...... rear surface sound hole, 16 ...... manpower code, 18- .... Baffle plate, 19 ...
... hole. Name of Agent Attorney Nakao Toshio and others 1 person 01 mouth Fig. 3 4 mouth Fig.
5/6 Fig. 6 7 Fig. 8
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