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JP2009089446

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2009089446
A speaker unit can be easily mounted in a headphone housing, and good reproduction sound can
be obtained from the speaker unit. A headphone housing 11 integrally formed with a cylindrical
portion 11d having an air chamber 11c using natural wood, and a speaker attached to the front
surface of the cylindrical portion 11d and outputting reproduced sound A headphone 10 is
provided, characterized in that it comprises at least a unit 15. [Selected figure] Figure 2
ヘッドホン
[0001]
The present invention relates to a headphone in which a cylindrical portion for adjusting acoustic
characteristics having an air chamber is formed in a headphone housing using natural wood, and
a speaker unit is directly attached to the front surface of the cylindrical portion.
[0002]
The present invention relates to a headphone in which a cylindrical portion for adjusting acoustic
characteristics having an air chamber is formed in a headphone housing using natural wood, and
a speaker unit is directly attached to the front surface of the cylindrical portion.
In general, headphones are a pair of left and right speaker units each attached to the left and
right pair of headphone housings through left and right (LR) audio signals output from a room or
portable audio device or video device via input cords The left and right (LR) voice signals are
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respectively converted into voices by the pair of left and right speaker units under the user's left
and right ears.
[0003]
Among headphones of this type, there is a headphone in which at least the back side of a speaker
unit of a housing accommodating a speaker unit is formed of a single plate of natural wood (see,
for example, Patent Document 1).
[0004]
FIG. 9 is a cross-sectional view showing a conventional headphone.
[0005]
The headphone 100 of the conventional example shown in FIG. 9 is disclosed in the abovementioned Patent Document 1 (Japanese Patent Application Laid-Open No. 01-144892), and will
be briefly described here with reference to Patent Document 1.
[0006]
As shown in FIG. 9, in the conventional headphone 100, the housing 101 has a large Young's
modulus and a large internal loss, and a large opening is made on the front side using a lumber
of natural wood, and the back side is cup-shaped Shape).
Further, a support piece 102 is provided in the housing 101, and the front plate 103 is
supported by the support piece 102, and the outer peripheral portion in the housing 101 is
closed at the outer peripheral portion of the front plate 103.
[0007]
In addition, a stepped opening 103a is opened through the central portion of the front plate 103,
and the speaker unit 104 has a square sound surface 104a facing forward and a magnetic circuit
portion 104b inside in the opening 103a. It is attached facing.
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Further, an ear pad 105 is attached to an outer peripheral portion on the front side of the front
plate 103.
[0008]
Furthermore, the wire 106 drawn out from the speaker unit 104 is inserted through the inside of
a cylindrical pipe 107 formed in the center of the rear surface of the housing 101 so as to
protrude from the outside of the housing 101 as an external connection cord 108 for input to the
speaker unit 104. It has been pulled out.
[0009]
Then, the headphone 100 having the above configuration is formed in a pair of left and right
symmetry, and is connected to a headband (not shown) via a pair of left and right housing
support members (not shown) incorporating a position adjustment mechanism. An assembly (not
shown) is configured.
[0010]
In this conventional headphone 100, since at least the back side of the speaker unit 104 of the
housing 101 is formed of a single plate of natural wood, the housing 101 has a high Young's
modulus and a large internal loss. Vibration is suppressed, and resonance in the housing 101 can
be used, and it is described that it is possible to listen to a reproduced sound very clear to a
natural sound with a clear timbre and enhanced mid frequency band. It is done.
[0011]
Unexamined-Japanese-Patent No. 01-144892 (page 2-3, FIG. 1).
[0012]
By the way, according to the conventional headphone 100, since natural wood is used for the
housing 101, the reproduced sound with the above-described acoustic characteristics can be
obtained, but the front plate 103 with the support piece 102 on the front side of the housing
101. Since the speaker unit 104 is attached to the central portion of the front plate 103, the
mounting structure of the speaker unit 104 is complicated because the entire housing has a twopart configuration of the housing 101 and the front plate 103. There is.
[0013]
Further, although the support piece 102 provided in the housing 101 has a function of
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supporting the front plate 103, whether or not a cylindrical portion (air chamber) for adjusting
acoustic characteristics is formed inside the support piece 102. Nothing is disclosed or
suggested, and it is considered that there is no guarantee that a good resonance sound can be
obtained only by the function of supporting the front plate 103 alone.
[0014]
Therefore, when a headphone housing is formed using natural wood, the speaker unit can be
more easily mounted in the headphone housing than in the conventional example, and acoustic
characteristics having an air chamber on the back side of the speaker unit in the headphone
housing By forming a cylindrical portion for adjustment, a reproduced sound better than that of
the conventional example can be obtained, and further, by providing an acoustic lens function in
front of the speaker unit, a headphone having a reproduced sound with better acoustic
characteristics can be obtained. It is desired.
[0015]
This invention is made in view of the said subject, The invention of Claim 1 forms the headphone
housing which integrally formed the cylindrical shape part which has an air chamber using
natural wood inside, The said cylindrical shape part And at least a speaker unit attached to the
front of the speaker and outputting reproduced sound.
The invention according to claim 2 is a headphone housing, a speaker unit mounted in the
headphone housing and outputting reproduced sound, and a plurality of front surfaces for
emitting the reproduced sound from the speaker unit. A sound output plate having a hole formed
therein, and a plurality of holes provided concentrically with the sound output plate with a
predetermined gap in front of the sound output plate and formed in the sound output plate To
form a central hole facing several holes in the inner peripheral portion at the central portion, and
the hole position deviates with respect to the remaining holes formed in the outer peripheral
portion of the sound output plate on the outer peripheral side from the central hole And an
acoustic lens plate having a plurality of holes disposed therein.
[0016]
In the headphone according to the present invention, according to claim 1, a speaker is formed
by directly forming a cylindrical portion having an air chamber in a headphone housing by using
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natural wood, and a speaker unit is directly attached to the front surface of the cylindrical
portion. The mounting structure of the unit is simpler than that of the conventional example, and
furthermore, the air room surrounded by the cylindrical shape has a good acoustic effect, so the
natural timbre of natural wood and natural wood It is possible to create a sound that makes use
of the attenuation characteristics due to
Further, according to the second aspect of the present invention, in particular, a sound output
plate having a plurality of holes formed in the front surface to emit the reproduced sound from
the speaker unit, and a predetermined gap in front of the sound output plate Among the plurality
of holes provided concentrically to the sound plate and formed in the sound output plate, a
central hole for facing several holes in the inner peripheral portion is formed at the central
portion, and from the central hole A midrange around 7 KHz to 10 KHz by exerting an acoustic
lens action with an acoustic lens plate in which a plurality of holes are arranged so that the hole
position is offset with respect to the remaining holes formed in the outer peripheral portion of
the sound emission plate on the outer peripheral side. Since the peaks of the frequency are
smoothed and decentralized, a reproduced sound having a sense of breadth to the middle
frequency band and extremely close to natural sound can be obtained.
[0017]
It is a figure which showed the headphone assembly which formed the headphone which
concerns on this invention in left-right paired symmetry, and connected the left-right paired
headphone to the headband via the left-right paired hanger, and (a) is a left side. A face view, (b)
is a front view, and (c) is a right side.
FIG. 2 is a cross-sectional view of the headphones according to the present invention.
The headphone which concerns on this invention is a figure for demonstrating a headphone
housing, (a) is a perspective view, (b) is sectional drawing, (c) is a top view.
FIG. 7 is a view for explaining a ring body in the headphone according to the present invention,
in which (a) is an AA 'cross section, (b) is a bottom view, (c) is a BOC cross section, (d ) Is a top
view.
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The headphone which concerns on this invention WHEREIN: It is the enlarged view shown and
demonstrated in order to demonstrate the sound emission board for speaker units, (a) is sectional
drawing, (b) is a top view.
The headphone which concerns on this invention is a figure for demonstrating a protector, (a) is
a B-OC sectional drawing, (b) is an upper side figure.
In the headphones concerning the present invention, it is a figure for explaining the state where
the sound emission board and the acoustic lens plate part of the protector were concentrically
overlapped, (a) is a plan view, (b) is on the same circumference. Is a schematic view of FIG. It is a
figure for demonstrating the acoustic characteristic of the headphones which concern on this
invention. It is sectional drawing which showed the headphone of a prior art example.
[0018]
Hereinafter, an embodiment of a headphone according to the present invention will be described
in detail with reference to FIGS. 1 to 8.
[0019]
FIG. 1 is a view showing a headphone assembly in which headphones according to the present
invention are formed in a pair of right and left symmetry and a pair of left and right headphones
are connected to a headband via a pair of left and right hangers. Is a left side view, (b) is a front
view, (c) is a right side, FIG. 2 is a cross sectional view showing the headphone according to the
present invention, and FIG. 3 is a headphone according to the present invention. It is a figure for
explaining, (a) is a perspective view, (b) is a sectional view, (c) is a top view, FIG. 4 is a figure for
explaining a ring body in the headphones concerning the present invention, (A) is an AA
'sectional view, (b) is a bottom view, (c) is an BOC sectional view, (d) is a top view, and FIG. 5 is a
speaker unit according to the present invention. A magnified view to illustrate the sound
emission board of the (A) is a cross-sectional view, (b) is a top view, FIG. 6 is a view for explaining
a protector in the headphone according to the present invention, (a) is a B-O-C cross-sectional
view, (b) FIG. 7 is a top view, FIG. 7 is a view for explaining a state in which the sound output
plate and the acoustic lens plate portion of the protector are concentrically overlapped in the
headphone according to the present invention; FIG. 8 is a schematic view on the same
circumference, and FIG. 8 is a view for explaining the acoustic characteristics of the headphones
according to the present invention.
[0020]
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As shown in FIG. 1, the headphone assembly 1 to which the headphone 10 according to the
present invention is applied is a combination of the left headphone 10L (10) and the right
headphone 10R (10) formed symmetrically on the left and right. A pair of left and right hangers
2L (2) and 2R (2) formed in a U shape on each side surface of the pair of left and right
headphones 10L and 10R are respectively suspended via a pair of pins (3, 3) and (3, 3) After
that, the headband 4 is connected to the pair of left and right hangers 2L and 2R, and the left and
right ears of the user are detachably assembled.
[0021]
Here, in the headphone 10 according to the present invention, the connection cord 17 for input
is attached to the lower part of the headphone housing 11 integrally formed using natural wood
as described later, and this connection cord 17 is used as the headphone housing 11. It is
connected to the speaker unit 15 attached to the inside.
[0022]
The headphones 10 according to the present invention have the same configuration except that
the left headphone 10L and the right headphone 10R have a left-right symmetric shape, and
therefore, the left and right are not distinguished in the following description.
[0023]
First, as shown in FIG. 2, the headphone 10 according to the present invention is formed in a cup
shape (bowl shape) on the rear surface 11 a side using maple, cherry or the like as natural wood
and on the front surface 11 b side A headphone housing 11 in which a cylindrical portion 11d
for adjusting acoustic characteristics having an air chamber 11c is projected, and a pair of pins 2
attached to the front surface 11b of the headphone housing 11 and having a U-shaped hanger 2
at the outer peripheral portion 3 and 3. Ring body 13 for attachment via (3), speaker unit 15
directly attached to the front face of cylindrical portion 11d formed on the front face 11b side of
headphone housing 11, and ring body 13 attached to center face and center on back face A
sound output plate 19 for the speaker unit is fitted in the part, and the sound output plate 19 is
separated from the sound output plate 19 by a predetermined gap S. A protector 20 for an
acoustic lens plate portion 20d which is formed concentrically disposed on the front center with
respect to 9, is schematically constituted by a ear pad 22 attached to the front surface outer
peripheral portion of the protector 20.
[0024]
Here, as shown in FIGS. 2 and 3 (a) to 3 (c), the headphone housing 11, which is a part of the
main part of this embodiment, has maple, cherry, etc. as natural wood. The rear surface 11a side
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is formed in a cup shape (bowl shape), and the cylindrical portion 11d for adjusting the acoustic
characteristics having the air chamber 11c at the central portion on the front surface 11b side is
ring shaped toward the front than the front surface 11b. The inside of the air chamber 11c which
is formed to protrude and is surrounded by the cylindrical portion 11d is a bottomed hole, and
the inner side of the front surface 11b is thinned to reduce the weight on the outer peripheral
side of the cylindrical portion 11d. The lightening portion 11e is formed in a concave shape.
[0025]
At this time, the rear surface 11a side of the headphone housing 11 exposes wood grain to give a
high-quality appearance, and the maximum outer diameter on the front surface 11b side is set to
about 100 mm.
[0026]
In addition, mounting holes 11b1 for attaching a ring body 13 described later to the front
surface 11b of the headphone housing 11 are drilled at a total of four places at equal intervals
approximately 90 ° apart on the same circumference, and more than the front surface 11b A
total of four attachment holes 11d1 for attaching a speaker unit 15 to be described later are
formed on the same circumference at approximately 90 ° intervals and at substantially equal
intervals on the front face of the protruding cylindrical portion 11d.
[0027]
Furthermore, along the outer peripheral surface of the cylindrical portion 11 d of the headphone
housing 11, horizontal holes 11 d 2 are drilled at a total of four locations at equal intervals apart
by approximately 90 °, and these four horizontal holes 11 d 2 in total Of the three lateral holes
11d2, three lateral holes 11d2 are provided with a duct function for releasing the air in the air
chamber 11c vibrated by the speaker unit 15 described later. An incombustible cloth 12 is
attached to the inside, and the other one of the lateral holes 11d1 is for inserting a wire 16 from
a speaker unit 15 described later into the connection cord 17 side.
[0028]
Next, in a total of four attachment holes 11b1 formed on the front surface 11b of the headphone
housing 11, a ring body 13 formed in a ring shape using a resin material such as ABS is attached
via a wood screw 14 .
[0029]
As shown in FIG. 2 and FIGS. 4 (a) to 4 (d), the ring body 13 has an inner peripheral side ring-
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shaped wall portion 13a formed in a ring shape at the central portion, and the inner peripheral
side ring shape A central hole 13a1 to be fitted into the outer peripheral portion of the
cylindrical portion 11d of the headphone housing 11 is formed to penetrate inside the wall
portion 13a, and a horizontal hole 13a2 is formed along the outer peripheral surface of the inner
peripheral side ring-shaped wall portion 13a. A total of four holes are drilled in correspondence
with the four horizontal holes 11d2 drilled along the outer peripheral surface of the cylindrical
portion 11d of the headphone housing 11.
[0030]
Further, in the ring body 13, the attachment portion 13c is formed flat by thinning the front side
between the inner peripheral side ring-shaped wall portion 13a and the outer peripheral side
ring-shaped wall portion 13b. A total of four attachment holes 13c1 are formed in
correspondence with the four attachment holes 11b1 formed on the front surface 11b side of the
headphone housing 11.
[0031]
In addition, on the attachment portion 13c of the ring body 13, a boss portion 13d with a hole
projects forward to the height dimension of the ring body 13 to support the protector 20
described later, and is separated by approximately 90 ° on the same circumference. The four
bosses 13d in total at four locations are formed at equal intervals on the inner peripheral side of
the four attachment holes 13c1 in total.
[0032]
Further, in the outer peripheral ring-shaped wall portion 13b of the ring body 13, four horizontal
holes 13b1 corresponding to the four horizontal holes 13a2 formed along the peripheral surface
of the inner peripheral side ring-shaped wall portion 13a. The connection cord 17 is attached to
one of the four lateral holes 13b1.
[0033]
Further, a pair of pins 3 and (3) for suspending the hanger 2 are attached to the outer periphery
of the outer peripheral side ring-shaped wall portion 13b of the ring body 13 at a distance of
approximately 180 °.
[0034]
Then, the outer peripheral portion of the cylindrical portion 11 d of the headphone housing 11 is
fitted into the center hole 13 a 1 of the ring body 13, and the wood screw 14 is mounted on the
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back surface side of the mounting portion 13 c of the ring body 13 with the front surface 11 b of
the headphone housing 11. It is attached through.
[0035]
Next, as the speaker unit 15, one having an outer diameter of about 50 mm and capable of
outputting reproduced sound of high sound quality is adopted.
The speaker unit 15 is attached to a total of four attachment holes 11 d 1 formed on the front
surface of the cylindrical portion 11 d of the headphone housing 11 via wood screws 18.
At this time, in the speaker unit 15, the diaphragm 15a on the front side is exposed so as to be
able to make a square, and the magnetic circuit portion 15b on the rear side is fitted in the
cylindrical portion 11d.
[0036]
Here, by directly attaching the speaker unit 15 to the front surface of the cylindrical portion 11d
formed in the headphone housing 11, the attachment structure of the speaker unit 15 becomes
simpler than the conventional example described above with reference to FIG. Further, since a
good acoustic effect is obtained in the air chamber 11c surrounded by the cylindrical portion
11d, as shown by the solid line in FIG. In this case, it is possible to make a sound that utilizes the
natural tone of natural wood and the attenuation characteristics of natural wood.
[0037]
In addition, the manufacturing method of the cylindrical shape part 11d formed in the front
surface 11b side of the headphone housing 11 is a method of integrally processing the natural
wood by cutting, and thinning the inside of the headphone housing 11 in a cup shape along the
rear surface 11a There is a method of integrally fixing the cylindrical portion 11d of the same
material to the inside with an adhesive, and any method may be used.
[0038]
Next, in front of the speaker unit 15, a sound emitting plate 19 for emitting the reproduced
sound output from the speaker unit 15 to the outside front is fitted on the back surface center
portion and the acoustic lens plate at the front center portion. A protector 20, in which the
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portion 20d is formed concentrically with the sound output plate 19, is attached via tapping
screws 21 to a total of four bosses 13d with holes formed on the front side of the ring 13 so as to
project.
[0039]
First, as shown in FIGS. 5 (a) and 5 (b) in an enlarged manner, the sound output plate 19
described above slightly protrudes forward in the circular arc shape on the front surface 19a side
using a resin material such as ABS. The outer peripheral portion 19b is formed to be stepped one
step lower than the front surface 19a side.
[0040]
A plurality of round holes 19a1 and 19a2 are pierced on the front surface 19a of the sound
output plate 19 in order to emit the reproduced sound output from the speaker unit 15 to the
outside front.
Here, when the first to fourth concentric circles are set in order of diameter from the inner
periphery to the outer periphery of the sound output plate 19, six round holes 19a1 of diameter
φd1 are drilled at equal intervals on the first concentric circle of diameter φD1. Also, 12 round
holes 19a1 of diameter φ d1 are drilled at equal intervals on the second concentric circle of
diameter φ D2, and 18 round holes 19 a1 of diameter φ d1 are equally spaced on the third
concentric circle of diameter φ D3. Eighteen circular holes 19a2 each having a diameter φd2
larger than the diameter φd1 are formed at equal intervals on the fourth concentric circle of the
diameter φD4.
Further, the sound output plate 19 has 18 round holes 19a1 drilled on the third concentric circle
of diameter φD3 and 18 round holes 19a2 drilled on the fourth concentric circle of diameter
φD4 from the center Are aligned on a plurality of radiation set at equal angles towards.
[0041]
And in this embodiment, although the sound release plate 19 is inserted into the stepped hole
20b formed in the center of the back surface of the protector 20 as described later, the present
invention is not limited to this. The sound board 19 may be integrally attached.
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[0042]
The sound output plate 19 shown in FIGS. 5 (a) and 5 (b) corresponds to the inner diameter of
the stepped hole 20b formed at the center of the back surface of the protector 20 shown in FIG.
6 (a) below. It is illustrated in an enlarged manner.
[0043]
Next, as shown in FIG. 2 and FIGS. 6A and 6B, the protector 20 described above is formed in a
thin cylindrical shape using a resin material such as ABS.
[0044]
Then, a stepped hole 20b is formed inside the rear surface 20a at a central portion on the rear
surface 20a side of the protector 20, and the above-mentioned sound release plate 19 is
positioned as described later in the stepped hole 20b. It is fitted.
[0045]
Further, an acoustic lens plate portion 20d, which is a part of the main portion of this
embodiment, is slightly projected toward the front in a circular arc shape at the central portion
on the front surface 20c side of the protector 20. The lens plate portion 20d is provided
concentrically with the sound output plate 19 positioned and fitted into the stepped hole 20b
from the rear surface 20a side, and a predetermined gap S is separated from the sound output
plate 19 It is formed to face the sound output plate 19.
At this time, the predetermined gap S set between the sound output plate 19 and the acoustic
lens plate portion 20d is about 2 to 3 mm, and in this embodiment, the predetermined gap S is
set to 2 mm.
[0046]
At this time, in the acoustic lens plate portion 20 d formed to protrude on the front surface 20 c
side of the protector 20, the round hole 20 d 1 of diameter φ d 1 is a sound emission plate 19
concentrically having the same diameter as the diameter φ D 3 of the third concentric circle of
the sound emission plate 19. The circular holes 20d2 having a diameter φd2 one circle larger
than the diameter φd1 on the concentric circle having the same diameter and the same diameter
as the diameter φD4 of the fourth concentric circle of the sound emission plate 19 are emitted.
Eighteen equal holes are drilled in the plate 19 at equal intervals, and a central hole 20d3 is
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drilled at a central portion with a diameter larger than the diameter φD2 of the second
concentric circle of the sound radiating plate 19 The holes 19a1 on the inner peripheral side
formed in the sound output plate 19 can be exposed in the center hole 20d3.
[0047]
Further, like the sound output plate 19, the acoustic lens plate portion 20d of the protector 20
has eighteen round holes 20d1 concentrically with a diameter φD3 and 18 round holes
concentrically with a diameter φD4. The holes 20d2 are arranged on a plurality of radiations set
at equal angles from the center toward the outer periphery.
[0048]
Further, on the outer surface side of the acoustic lens plate portion 20d on the front surface 20c
side of the protector 20, a bottomed round attachment hole 20e is formed approximately 90
degrees apart on the same circumference and a total of four places are formed. The four
attachment bottomed round holes 20 e correspond to a total of four holed bosses 13 d formed in
the ring body 13.
[0049]
Further, an inner peripheral side ring-shaped wall portion 20f is formed on the rear surface 20a
side of the protector 20, and the inner peripheral side ring-shaped wall portion 20f is formed to
be engageable with the front outer peripheral portion of the cylindrical portion of the headphone
housing 11. An outer peripheral ring-shaped wall portion 20g is formed outside the inner
peripheral side ring-shaped wall portion 20f.
[0050]
Further, the outer peripheral portion of the front surface 20c of the protector 20 has a function
for attaching the ear pad 20, and the lower side of the front surface 20c is formed into a tapered
surface 20c1, whereby the lower side of the ear pad 20 is also a tapered surface. Because it
becomes, it can be worn in close contact with the ear.
[0051]
Here, with respect to the acoustic lens plate portion 20d of the protector 20, the sound output
plate 19 is positioned and fitted in the stepped hole 20b from the rear surface 20a side of the
protector 20 using FIGS. 7 and 8. explain.
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[0052]
First, as shown in FIGS. 7A and 7B, the center hole of the acoustic lens plate portion 20d formed
on the front surface 20c of the protector 20 when the sound output plate 190 is fitted into the
center of the rear surface of the protector 20. 20d3 are pierced with a diameter larger than the
diameter .phi.D2 of the second concentric circle of the sound output plate 19 as described above,
the first, second and third diameters .phi.D1 and .phi.D2 at the front surface 19a side of the
sound output plate 19 are obtained. Each round hole 19a1 of diameter φ d1 drilled on two
concentric circles faces the center hole 20d3.
[0053]
Further, a circular hole 19a1 of diameter φd1 drilled on the third concentric circle of diameter
φD3 on the front surface 19a side of the sound output plate 19 and an acoustic lens plate
portion 20d formed on the front surface 20c side of the protector 20 have a diameter of φD3.
Since 18 round holes 20d1 of diameter φ d1 concentrically provided on concentric circles are
on the same concentric circle, the positions of the holes between the sound output plate 19 side
and the acoustic lens plate portion 20 d side on the concentric circle of diameter φ D3
Positioning the sound output plate 19 in the stepped hole 20b from the rear surface 20a side of
the protector 20 so that the round hole 19a1 on the sound output plate 19 side is disposed
between the adjacent round holes 20d1 on the acoustic lens plate portion 20d side by shifting. It
has been fitted.
[0054]
In the same manner as described above, circular holes 19a2 of 18 diameter φ d2 drilled on the
fourth concentric circle of diameter φ D4 on the front surface 19a side of sound output plate 19
and acoustic lens plate portion 20d formed on front surface 20c of protector 20 Since 18 round
holes 20d2 of diameter φd2 drilled on concentric circles of diameter φD4 are also on
concentric circles of the same diameter, holes on the concentric circle of diameter φD4 between
the sound output plate 19 side and the acoustic lens plate portion 20d side The round holes
19a2 on the side of the sound output plate 19 are disposed between the adjacent round holes
20d2 on the side of the acoustic lens plate portion 20d by shifting the position of.
[0055]
Then, with the sound output plate 20 positioned and fitted into the stepped hole 20b from the
rear surface 20a side of the protector 20, the tapping screw 21 is inserted from the inside of the
mounting closed round hole 20e of the protector 20 in a total of four places. Attach the ear pad
22 along the outer peripheral part of the front face 20 c of the protector 20, and attach it to the
total of four bosses 13 d with holes formed in the ring body 13 via the rear end of the ear pad 22
The rear surface 20 a of the protector 20 is removably covered.
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[0056]
Then, among the reproduced sound output from the speaker unit 15, the reproduced sound
having passed through the respective round holes 19a1 on the first and second concentric circles
of the diameters φD1 and φD2 drilled in the inner peripheral region of the sound emitting plate
19 is It is output as it is from a central hole 20d3 formed in the acoustic lens plate portion 20d
of the protector 20.
[0057]
On the other hand, as shown in FIG. 7B, of the reproduced sound output from the speaker unit
15, each concentric circular hole 19a1 of diameter .phi.D3 and each concentric circle of diameter
.phi.D4 formed in the sound release plate 19 are provided. The reproduced sound that has
passed through the circular hole 19a2 enters the predetermined gap S set between the sound
output plate 19 and the acoustic lens plate portion 20d of the protector 20, and is generated in
the acoustic lens plate portion 20d of the protector 20. The hole is not hit by the wall, it is
diffused to the left and right by this wall, and the refracting action works in the predetermined
gap S, and then each circle on the concentric circle of diameter φD3 drilled in the acoustic lens
plate portion 20d of the protector 20 Since the light is output to the outside from the holes 20d1
and the respective circular holes 20d2 concentrically with the diameter φD4, an acoustic lens
action acts in substantially the same manner as the so-called refracting action of the optical lens
on light.
[0058]
As a result, when there is the above-mentioned acoustic lens action, the acoustic characteristic as
shown by a dotted line in FIG. 8 is obtained, and in this case, the peak of the midrange frequency
around 7 KHz to 10 KHz is smoothed and dispersed. It is possible to obtain a reproduced sound
having a feeling of expansion with respect to the middle frequency band and very close to
natural sound.
[0059]
In this embodiment, since the sound output plate 19 is inserted into the center of the rear
surface of the protector 20, it is easy to position the sound output plate 19 to the acoustic lens
plate portion 20d. When integrally mounted on the front surface of the unit 15, the sound output
plate 19 is separated from the acoustic lens plate portion 20d of the protector 20 with a
predetermined gap S, and therefore the arc shape on the front surface 20c side of the protector
20 is If the mounting holes are formed so as to be position adjustable, the protector 20 may be
mounted on the ring body 13 through the arc-shaped mounting holes after adjusting the position
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with respect to the sound output plate 19 while rotating the protector 20 in the circumferential
direction. It is a thing.
[0060]
Furthermore, the technical concept of providing an acoustic lens plate at a predetermined
distance in front of a sound emission plate that emits reproduced sound from a speaker unit
mounted in the headphone housing is the structure in which the speaker unit is mounted in the
headphone housing It is applicable to all the headphones of a form.
[0061]
DESCRIPTION OF SYMBOLS 1 ... Headphones assembly, 2 (2L, 2R) ... Hanger, 3 ... Pin, 4 ...
Headband, 10 (10L, 10R) ... Headphones, 11 ... Headphone housing, 11a ... Back surface, 11b ...
Front surface, 11c ... Air room , 11d: cylindrical part, 11e: thin part, 13: ring body, 15: speaker
unit, 16: wire, 17: connection cord, 19: sound output plate, 19a: front surface, 19a1, 19a2: round
hole, 20 ... Protector, 20a ... rear surface, 20b ... stepped hole, 20c ... front surface, 20d ... acoustic
lens plate portion, 20d1, 20d 2 ... round hole, 20d 3 ... center hole, 22 ... ear pad.
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