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JP2014127730

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DESCRIPTION JP2014127730
Abstract: To provide a sound emitting device capable of obtaining high quality reproduced sound.
A first air chamber (VA2), a second air chamber (VA3) communicating with the first air chamber
via a sound passage (16c), one end side opens into the second air chamber, and the other end
side is an external space And a duct opened at V5. The main body includes a first driver unit DU1
disposed so that the output sound is directly emitted to the external space, and a second body
disposed in the main body such that the output sound is emitted to the first air chamber. A sound
emitting device HS comprising a driver unit DU2, a signal supply unit for supplying an audio
signal to the first and second driver units, and a sound emitting device capable of mounting the
sound emitting device itself in the pinna The headphone further comprises an ear hook that can
be attached to the pinna by connecting the two or a headband that can be attached to the head
by connecting the sound emitting device. [Selected figure] Figure 11
Headphones and sound emitting device
[0001]
The present invention relates to a headphone and a sound emitting device.
[0002]
A sound emitting device that emits a sound to the outside by providing a driver unit
(synonymous with a speaker unit) is applied to an acoustic device such as a desk speaker or the
main body of a headphone.
[0003]
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With regard to headphones, in the usage mode, an inner ear type in which the main body which
is a sound emitting device is mounted inside the pinna, an ear hook type in which the ear hook is
hooked on the pinna and the main body is attached to the pinna, head It is roughly classified into
an overhead type in which the band is attached to the head and the body is attached to the pinna
or the pinna is covered.
In either type, the main unit equipped with the driver unit is used supported by the pinna and the
head.
Therefore, it is a reality that it is difficult to mount a large-sized driver unit such that the wearing
feeling is impaired in terms of size and mass.
[0004]
Thus, in the headphone, while the size of the driver unit, in other words, the size of the diameter
of the diaphragm is limited, for example, only one full-range driver unit is used to extend from
the low range to the high range There are many difficulties in designing the quality of playback
sound in a wide range. In particular, since it is difficult to increase the diameter of the diaphragm,
improvement of the sound quality including the volume of the bass region is always required.
[0005]
Therefore, a so-called multi that divides the reproduction range into a plurality of ranges such as
a low range and a high range, which are conventionally used widely in large-sized speaker
systems such as a floor, and handles a suitable driver unit for each range A technology for
applying a configuration called a speaker to headphones has been considered.
[0006]
As an example of the technology, it is provided with three driver units for low range, middle
range and high range, and a cover having a spherical portion, and the driver units are covered at
the same distance from the entrance of the ear canal Patent Document 1 describes an overhead
type headphone disposed in the spherical portion of
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[0007]
In addition, a technology of applying to a headphone a bass reflex type structure that is
considered to enhance the reproduction capability in the low frequency range is also considered,
and an example of an in-ear type headphone is described in Patent Document 2.
[0008]
Utility model registration 3167130 gazette JP, 2006-287674, A
[0009]
Although the above-described conventional examples are expected to have some effect, the
market demands a further improvement in the quality of the reproduced sound.
[0010]
Therefore, the problem to be solved by the present invention is to provide a headphone and a
sound emitting device capable of obtaining high-quality reproduced sound.
[0011]
In order to solve the above problems, the present invention has the following configuration 1) or
2).
1) A first air chamber (VA2), a second air chamber (VA3) communicating with the first air
chamber (VA2) through a sound passage (16c), and one end of the second air chamber (VA2) The
main body (1) has a duct (DT) opened in the chamber (VA3) and the other end opened in the
external space (V5), and an output sound is transmitted to the external space (V5) in the main
body (1). A first driver unit (DU1) arranged to be discharged directly to the second unit, and a
second driver unit arranged to emit an output sound to the first air chamber (VA2) to the main
body (1). A sound emitting device (HS) comprising a driver unit (DU2), a signal supply unit (4) for
supplying an audio signal to the first and second driver units (DU1, DU2), and the sound emitting
device (HS) It is possible to attach itself in the pinnae, further comprising an ear hooking part
(51Ba) connectable to the sound emitting apparatus (HS) and attachable to the pinna, or the
sound emitting apparatus (HS) A headband that can be attached to the head by connecting (3)
further comprising a, a headphone (51).
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2) A first air chamber (VA2), a second air chamber (VA3) communicating with the first air
chamber (VA2) via the sound passage (16c), and one end of the second air chamber (VA2) The
main body (1) includes a duct (DT) opened in the chamber (VA3) and the other end opened in the
external space (VA5); and an output sound is transmitted to the external space (VA5) in the main
body (1). A first driver unit (DU1) arranged to be discharged directly to the second unit, and a
second driver unit arranged to emit an output sound to the first air chamber (VA2) to the main
body (1). It is a sound emitting apparatus (HS) provided with a driver unit (DU2) and
[0012]
According to the present invention, it is possible to obtain high-quality reproduced sound.
[0013]
It is a perspective view for explaining the example of the headphones concerning an embodiment
of the invention.
It is sectional drawing for demonstrating the main-body part structure K1 which is a structure of
sound emission apparatus HS which is an Example of the sound emission apparatus which
concerns on embodiment of this invention.
It is other sectional drawing for demonstrating main-body part structure K1.
It is an exploded perspective view for explaining body part structure K1.
It is another disassembled perspective view for demonstrating the main-body part structure K1.
It is a three-sided figure for demonstrating the driver base 16 used by main-body part structure
K1. It is a perspective view for demonstrating driver base 16 used with body part structure K1. It
is a top view for explaining duct joint 21 used with body part structure K1. It is a top view for
explaining body part structure K1. It is a perspective view for explaining body part structure K1.
It is a typical sectional view for explaining body part structure K1. It is a typical sectional view for
explaining body part structure K2 which is a structure of modification 1 of sound emission
device HS. It is a typical sectional view for explaining body part structure K3 which is a structure
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of modification 2 of sound emission device HS. It is a typical sectional view for explaining body
part structure K4 which is the structure of modification 3 of sound emission device HS. It is a top
view for explaining body part structure K4. It is a schematic diagram top view for demonstrating
body part structure K1. It is a perspective view for demonstrating the application example of the
sound emission apparatus HS.
[0014]
A sound emitting device and headphones according to an embodiment of the present invention
will be described by means of a preferred embodiment with reference to FIGS.
[0015]
(Example) The main-body part structure K1 which is a structure of the sound emission apparatus
HS of an Example is applied to the main-body parts 1 and 2 which are sound emission
apparatuses HS with which the headphone 51 was equipped, for example.
First, the headphone 51 will be described with reference to FIG. FIG. 1 is a perspective view
showing the appearance of the headphone 51. As shown in FIG. The headphone 51 is an
overhead type, and connects the main unit 1 for the left ear, the main unit 2 for the right ear, and
the main unit 1 and the main unit 2, and the headband 3 is stretched around the head in use.
And. A cord 4 for connection to an external audio output device is drawn from the main body 1.
Since the main body 1 and the main body 2 basically have the same structure, the main body 1
will be described as a representative in the following description. The directions in the upper,
lower, left, right, front, and rear directions of the main body 1 in the following description are not
in the mounted state, but are defined by the directions shown by the arrows in FIG.
[0016]
Next, the structure of the main body 1 (main body structure K1) will be described in detail with
reference to FIGS. 2 is a view of the main unit 1 cut along the horizontal (left, right, front and
rear) plane at the S1-S1 position of FIG. 1 and viewed from below; FIG. 3 is an upper half at the
S2-S2 position of FIG. It is the figure which cut ¦ disconnected in the perpendicular ¦ vertical
(upper and lower back and front) surface, and cut ¦ disconnected the lower half in the surface
inclined by angle (theta) 1 (refer FIG. 9) from the vertical surface. FIG. 4 is a perspective exploded
view of the main body 1 (excluding the main body case 11 and the ornament 12). FIG. 5 is a
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perspective exploded view in which the main body 1 is disassembled into three main parts.
[0017]
The main body portion 1 has a cup-shaped main body case 11 whose front side is open and
whose rear side has a substantially stepped small diameter, and a ring-shaped ornament 12
attached so as to be externally fitted to a rear portion of the main body case 11; A baffle plate 13
attached so as to close an opening on the front side of the main body case 11 and an ear pad 14
detachably attached to the flange portion 13 a of the baffle plate 13 are provided. The main body
case 11 has an annular opening side wall 11a on the opening side, a small-diameter annular
middle wall 11b connected to the opening side wall 11a, and a bottom wall 11c covering the
opposite side of the opening. There is. The main body portion 1 has a connecting portion 1J to
which one end portion side of the headband 3 is connected at an upper side portion of the main
body case 11. In this connection, the main body 1 is capable of swinging in the left and right
direction and the up and down direction with respect to the headband 3 within a predetermined
rotation range.
[0018]
An annular peripheral wall 13 c is provided on the rear surface 13 b of the baffle plate 13 so as
to stand rearward. Inside the peripheral wall portion 13c, a driver unit DU1 is fixed by adhesion
or the like as a speaker having a diaphragm DU1a. In this example, the driver unit DU1 has a flat
disk shape, and the peripheral wall 13c is also formed in an annular shape. In the baffle plate 13,
a sound emitting portion 13 d in which a plurality of small sound emitting holes are collectively
formed is provided in a range substantially facing the diaphragm DU 1 a in order to emit the
sound generated by the vibration of the diaphragm DU 1 a to the outside. ing.
[0019]
Further, in a region outside the peripheral wall portion 13c in the baffle plate 13, a duct sound
emitting portion 13e including a pair of through holes 13e1 and 13e2 is formed. A duct joint 21
of duct bodies 19 and 20 described later is connected to the pair of through holes 13e1 and
13e2, respectively. A substantially cup-shaped cover 15 is attached to the rear surface 13 b of
the baffle plate 13 with the seal ring 17 interposed therebetween so as to surround and cover the
peripheral wall portion 13 c. The seal ring 17 is formed of a resilient, substantially air-
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impermeable material. An example of the material is urethane foam. The cover 15 is attached
such that its end is pressed against the seal ring 17 to seal between the baffle plate 13 and the
cover 15. Thus, a space V1 surrounded by the inner surface of the cover 15, the rear surface 13b
of the baffle plate 13 and the rear surface of the driver unit DU1 is in a sealed state. The room
which forms this space V1 is called air room VA1.
[0020]
A substantially cylindrical driver base 16 is attached to the rear surface 13 b of the baffle plate
13 with the seal ring 17 interposed therebetween so as to surround and cover the cover 15.
[0021]
Here, the driver base 16 will be described mainly with reference to FIGS. 6 and 7.
FIG. 6 is a three-sided view of the driver base 16, FIG. 6 (a) is a rear view, FIG. 6 (b) is a left side
view, and FIG. 6 (c) is a top view. Further, FIG. 7 is a perspective view, and is a view as viewed
from the rear upper right direction in a state of being assembled as the main body portion 1.
[0022]
The driver base 16 is formed in a substantially annular shape in this example. The driver base 16
has an annular base 16 a and a radially outwardly projecting flange portion 16 b formed on the
rear side of the base 16 a. The base portion 16a is formed with an opening 16c communicating
with the inside and the outside. In this example, three openings 16c1 to 16c3 are formed as the
openings 16c. Specifically, the opening 16c1 is provided on the upper side, and the opening
16c2 and the opening 16c3 are provided at positions shifted by 90 ° in the circumferential
direction with respect to the opening 16c1. Also, in this example, the three openings 16c are
provided as round holes of the same diameter Da. On the lower front side of the base portion
16a, a recess 16d is formed so as to arc inwardly in a predetermined angular range. The duct
joint 21 is adapted to be accommodated in the depressed space of the recess 16 d.
[0023]
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Referring back to FIGS. 2 to 5, an annular cylinder 18 is fitted to the outside of the driver base
16. Specifically, the cylinder 18 is fixed to the driver base 16 by an adhesive or the like so that a
gap is not generated as much as possible. In the cylinder 18, openings 18 c 1 to 18 c 3 having
the same shape as the openings 16 c 1 to 16 c 3 are formed at positions corresponding to the
openings 16 c 1 to 16 c 3 of the driver base 16. Hereinafter, unless otherwise noted, the
openings 16c1 to 16c3 refer to portions opened for convenience including the openings 18c1 to
18c3.
[0024]
A driver unit DU2 is fixed by bonding or the like as a speaker having a diaphragm DU2a to the
inner peripheral surface of the portion of the main body 1 where the flange portion 16b of the
driver base 16 is formed. The driver base 16 is attached such that the front end is pressed
against the seal ring 17 to seal between the baffle plate 13 and the driver base 16. By fixing the
driver unit DU2 to the driver base 16, the space V2 surrounded by the driver unit DU2, the driver
base 16, the cover 15, and the baffle plate 13 is sealed except for the opening 16c. The room
which forms this space V2 is called air room VA2. Further, the rear end portion of the driver base
16 is fixed to the inner surface of the intermediate wall portion 11 b of the main body case 11 by
an adhesive or the like. Thereby, the space V4 surrounded by the rear surface side portion of the
driver unit DU2 and the inner surface of the main body case 11 is sealed. The room which forms
space V4 is called air room VA4.
[0025]
In the main body case 11 and the baffle plate 13, the tip end portion of the opening side wall
portion 11 a of the main body case 11 is fixed to the baffle plate 13 by adhesion or the like.
[0026]
The main body case 11, the baffle plate 13, the cover 15, and the driver base 16 are formed of,
for example, a thermoplastic resin material.
An example of the resin material is ABS resin (acrylonitrile butadiene styrene resin). The material
is not limited to resin, and may be formed of, for example, metal. It is desirable that the ornament
12 be formed of a metal material from the viewpoint of design. An example material is aluminum.
The cylinder 18 is desirably formed of, for example, a material having a large specific gravity as
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compared with the driver base 16. For example, brass or stainless steel.
[0027]
In the body portion structure K1 of the embodiment, the driver unit DU2 has a flat disk shape,
and the diameter of the movable portion including the diaphragm DU2a is larger than the
diameter of the movable portion including the diaphragm DU1a of the driver unit DU1. ing.
Further, as shown in FIG. 2, the size and the arrangement position of the driver unit DU2 are set
so as not to protrude outward in the radial direction (upper, lower, left, and right directions) from
the outer shape of the ear pad 14. In this example, the outer shape of the ear pad 14 in a rear
view is substantially circular, and as shown in FIG. 2, the relationship between the outer diameter
Dc of the ear pad 14 and the outer diameter Db of the driver unit DU2 is Db <Dc. It is done.
Further, in design, the shape line at the outermost position of the outer side surface 11a1 of the
opening side wall portion 11a of the main body case 11 is set to be substantially equal to the
shape line of the outer side surface of the ear pad 14. The ear pad 14 is a donut shaped ear rest
14a surrounding the user's auricle and in contact with the head in the wearing state of the
headphone 51, and a blindfold made of a thin mesh covering the front surface 13f of the baffle
plate 13 immediately before that. And 14b. The blind portion 14b does not affect the volume and
sound quality of the sound to be emitted, and is not shown in the drawings other than FIG.
[0028]
Thereby, a space V3 can be formed between the driver base 16 and the main body case 11 in an
arc shape as a donut shape or a part of a donut shape. In the embodiment, one space V3 is
formed substantially in one round, that is, substantially in a donut shape. Specifically, the space
V3 is surrounded by the inner surface 11d of the main body case 11, the outer peripheral
surface 16e of the driver base 16, and the outer peripheral surface 18a of the cylinder 18 if it
has the cylinder 18, and the rear surface 13b of the baffle plate 13. It is formed. The room which
forms this space V3 is called air room VA3.
[0029]
The space V3 in the air chamber VA3 and the space V2 in the air chamber VA2 are
communicated only by the opening 16c. On the other hand, the space V3 in the air chamber VA3
and the external space V5 communicate with each other by the duct portion DT. In the body
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portion structure K1 of the embodiment, the duct portion DT is constituted by a pair of arcshaped duct bodies 19 and 20 formed in an arc shape. In the main body portion structure K1, the
duct body 19 and the duct body 20 are formed and arranged in a shape and layout that are plane
symmetric. The magnitudes of the volumes of the space V2 and the space V3 are not limited. For
example, the shapes of the air chamber VA2 and the air chamber VA3 are determined such that
the volume of the space V3 is larger than the volume of the space V2.
[0030]
Here, the duct bodies 19 and 20 will be described in detail with reference mainly to FIG. The duct
body 19 is attached to one end side of a base 19a which is an arc-shaped tube having a through
hole 19a1 (see FIG. 9) and one end of the base 19a to change the flow direction of air flowing in
the through hole 19a1 by 90 °. And a duct joint 21. The duct body 20 also has a base 20 a and
a duct joint 21. At one end side of the bases 19a and 20a, straight portions 19a2 and 20a2 are
formed in a straight shape by bending toward the center of curvature of the bases 19a and 20a.
Duct joints 21 are attached to the ends of the straight portions 19a2 and 20a2, respectively. This
attachment is performed by fitting by strong fitting, fixing by an adhesive, or the like.
[0031]
The bases 19a and 20a are formed, for example, such that the outer shape of the cross section
has a circular shape. The material is not limited, and can be made of, for example, resin, rubber,
metal or the like. A specific example is silicone rubber. The duct joint 21 is formed by injection
molding of a thermoplastic resin. An example of the resin material is PP (polypropylene).
[0032]
The duct joint 21 is, as shown in FIG. 8, formed of a substantially cylindrical main body 21a, a
joint portion 21c protruding from the side surface of the main body 21a, and a through hole
which is an air passage bent approximately 90 ° inside the main body 21a. 21b and a stepped
portion 21e projecting from one end face of the main body 21a. One end side of the through hole
21b is open at the end face of the joint portion 21c. Further, the other end side is opened as an
outlet 21 d in the tip end surface of the stepped portion 21 e. The duct body 19 is formed by
fitting the joint portion 21c into the through hole 19a1 of the straight portion 19a2 of the base
portion 19a. As a result, the through hole 19a1 communicates with the through hole 21b which
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is the air passage of the main body 21a, and its direction is deflected by 90 ° to become a
passage reaching the outlet 21d. The duct body 20 also has the same structure.
[0033]
Duct bodies 19 and 20 which are duct part DT are arranged in space V3. This arrangement will
be described with reference to FIGS. 9 and 10 as well. FIG. 9 is a rear view showing a part of the
headband 3 and the main body portion 1 with the main body case 11, the ornament 12, the
driver unit DU2 and the driver base 16 removed. FIG. 10 is a perspective view showing only the
head band 3 and the main body 1 excluding the main body 2 from the headphones 51. As shown
in FIG. Moreover, regarding the main-body part 1, the ear pad 14 and the baffle plate 13 are
shown in the removed state.
[0034]
The duct bodies 19 and 20 are arranged along the outer peripheral wall of the driver base 16 (in
the case where the cylinder 18 is provided, along the outer peripheral surface 18 a of the
cylinder 18). The duct bodies 19 and 20 may or may not be in contact with the outer peripheral
surface 16 e of the driver base 16 (when the cylinder 18 is provided, the outer peripheral surface
18 a of the cylinder 18). More specifically, the duct bodies 19 and 20 are arranged in plane
symmetry with respect to the upper and lower front and rear planes passing through the central
axis line CL16 of the driver base 16, for example. In this arrangement, the duct bodies 19 and 20
are housed and held between the baffle plate 13 and the ribs 11 e protruding from the main
body case 11. In the body portion structure K1, the central axis line CL16 is set to coincide with
the drive axis line CLDU2 of the driver unit DU2. The coincidence is not limited, and the central
axis 16, the drive axis CLDU1 of the driver unit DU1, and the drive axis CLDU2 may cross each
other. However, if they all match or are parallel to each other, the outer shape of the main body 1
can be set more compactly.
[0035]
As understood from FIGS. 9 and 10, the duct bodies 19 and 20 are disposed in the space V3, and
in the space V3, inlets 19a3 and 20a3, which are openings at one end of the through holes 19a1
and 20a1, are provided. It is open. Further, the stepped portion 21e of the duct joint 21 on the
other end side is engaged with and coupled to the duct sound emitting portion 13e of the baffle
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plate 13 (see FIG. 3). That is, the space V3 communicates with the external space V5 (see FIG. 3)
only through the through holes 19a1 and the through holes 21b in the duct body 19 and the
through holes 20a1 and the through holes 21b in the duct body 20. Accordingly, the sound
output from the front side of the driver unit DU2 sequentially passes through the space V2, the
opening 16c, and the space V3, and then passes through either of the two paths of the duct body
19 and the duct body 20 to the external space V5. Output to
[0036]
In the main body portion 1 of the main body portion structure K1, the inlets 19a3 and 20a3 of
the duct bodies 19 and 20 are set at positions inclined by angles θ3 and θ4 with respect to the
vertical direction, as shown in FIG. Further, the angle θ3 and the angle θ4 are set equal.
Similarly, as is apparent from FIGS. 9 and 10, the outlets 21d of the duct bodies 19 and 20 are
disposed at positions inclined by angles θ1 and θ2 with respect to the vertical direction.
Further, the angle θ1 and the angle θ2 are set equal.
[0037]
The driver unit DU1 and the driver unit DU2 are wired such that the audio signals coming from
the code 4 are supplied in parallel in the same phase. That is, the code 4 functions as a signal
supply unit that supplies an audio signal to the driver units DU1 and DU2.
[0038]
In FIGS. 9 and 10, a circular arc strip-shaped substrate 22 not shown in the other figures is
shown. The substrate 22 is not necessarily provided in the headphone 51. However, a wireless
receiving circuit in the case of making the headphone 51 wireless compatible, a circuit in the
case of making noise cancellation compatible, a circuit in the case of requiring a speaker network
circuit, etc. It is used when you The substrate 22 is fixed to the rear surface 13 b of the baffle
plate 13. In the case of wireless compatibility, the wireless reception circuit functions as a signal
supply unit that supplies an audio signal to the driver units DU1 and DU2.
[0039]
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FIG. 11 is a longitudinal sectional view schematically showing the main body structure K1
described above in detail. The main body structure K1 has two driver units DU1 and DU2.
[0040]
The driver unit DU1 is mounted in a posture in which the diaphragm DU1a is directed to the
front side and a drive system for driving the diaphragm DU1a is disposed on the rear side of the
diaphragm DU1a. Among the sounds generated by the vibration of the diaphragm DU1a, only the
sound S11 emitted to one side (forward side) is emitted to the external space V5. Release of the
sound S11 to the external space V5 is directly performed without passing through the air
chamber. That is, the sound S11 is emitted to the outside space V5 as a direct sound. The sound
S12 emitted to the other side (rear side) is emitted to the space V1. Since the air chamber VA1
forming the space V1 is sealed, the sound S12 is not emitted to the external space V5.
[0041]
The driver unit DU2 is mounted in a posture in which the diaphragm DU2a is directed to the
front side and a drive system for driving the diaphragm DU2a is disposed on the rear side of the
diaphragm DU2a. Of the sounds generated by the vibration of the diaphragm DU2a, only the
sound S21 emitted to one side passes through the air chamber VA2 and the air chamber VA3
provided in series in this order and provided in parallel in the air chamber VA3. The duct body
19 and the duct body 20 are emitted to the external space V5 as the sound S21A and the sound
S21B, respectively. That is, the sound S21 is emitted not as a direct sound but as an air chamber
passing sound which has passed through the air chamber to the external space V5. The air
chamber VA2 and the air chamber VA3 are air chambers connected via the opening 16c, which is
a sound passage, and the air chamber VA2 is the first stage, and the air chamber VA3 is the
second It is an eye. On the other hand, the sound S22 emitted to the other side is emitted to the
space V4. Since the air chamber VA4 forming the space V4 is sealed, the sound S22 is not
emitted to the external space V5.
[0042]
In the body portion structure K1, the air chamber VA2 is provided at a central portion including
the central axis line CL16 of the driver base 16. On the other hand, the air chamber VA3 is
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formed to extend radially outward with respect to the air chamber VA2, for example, in the
circumferential direction so as to surround the air chamber VA2. That is, the air chamber VA2
and the air chamber VA3 are provided side by side in the radial direction. Further, the air
chamber VA3 is provided radially outside of the driver unit DU1. The sound S21 output from the
driver unit DU2 is configured to pass through the opening 16c from the space V2 outward in the
radial direction from the inner side to enter the space V3.
[0043]
The air chamber VA2 and the air chamber VA3 are partitioned by a base 16a of the driver base
16 (in the case where the cylinder 18 is provided, the cylinder 18 is also included) which is a
circumferentially extending wall. Further, the space V2 of the air chamber VA2 and the space V3
of the air chamber VA3 communicate with each other through the opening 16c having a
predetermined opening area. The opening 16c may be a single opening or a plurality of
openings. In the present embodiment, the opening 16c is constituted by three openings 16c1 to
16c3 of the same shape. The specification (the number, the opening area, the opening position,
and the like) of the opening 16c is not limited, and can be appropriately selected and set.
[0044]
The space V <b> 3 and the external space V <b> 5 are communicated by the duct body 19 and
the duct body 20. The specifications (number, cross sectional area, length, arrangement position,
material, and the like) of the duct body are not limited, and can be selected as appropriate. The
space V2 and the space V3 constitute a so-called double bass reflex structure. Therefore, the
sound output from the duct body 19 and the duct body 20 first becomes a mid-bass rich sound
in which the high range is suppressed.
[0045]
Further, if the air chamber VA2 and the air chamber VA3 are regarded as an integral air
chamber, it can be considered that a so-called Kelton-type sound emitting structure is constituted
by the integral air chamber and the duct bodies 19 and 20. In general, the Kelton-type sound
emitting structure is such that the sound emitted into the air chamber acts as a low pass filter
and is emitted from the duct. Therefore, in the main body portion 1, the double bass reflex type
action and the Kelton type action are exhibited as a synergetic action. Specifically, the sound S21
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output from one side of the driver unit DU2 has the sound of the double bass reflex type sound
emission structure and the sound above the desired frequency due to the Kelton type sound
emission structure sharply attenuated. Due to the low-pass filter action, only the bass component
becomes a sound enriched with bass which is efficiently extracted, and is emitted from the duct
body 19 and the duct body 20 to the external space V5 as the sounds S21A and S21B,
respectively.
[0046]
The duct sound emitting portion 13e which is the outlet of the duct body 19 and the duct body
20 is opened at the front surface 13f of the baffle plate 13 which is the same surface as the
surface of the driver unit DU1 from which the sound S11 is output. Thereby, a sound S11 which
is a sound from the driver unit DU1, and a bass rich sound S21A, S21B which is an air chamber
passing sound which is output through the double bass reflex type and Kelton type sound
emitting structure from the driver unit DU2. However, it mixes in the front space V6 of the baffle
plate 13 which is also the external space V5, and it becomes an output sound of the
characteristic which mutually complemented. The user of the headphone 51 listens to the output
sound mixed in the front space V6 in this manner. Hereinafter, this output sound is referred to as
a listening sound ST.
[0047]
In this body portion structure K1, two driver units DU1 and DU2 are provided in parallel in the
front-rear direction, and two air chambers VA2 and VA3 for passing sound S21 emitted from the
driver unit DU2 on the rear side in radial direction Arranged side by side. Further, the radially
outer air chamber VA3 is formed as a chamber extending in the circumferential direction. As a
result, the main body 1 can be formed as compact as possible without making the air chamber
and the duct an outward projecting part.
[0048]
The frequency characteristics of the listening sound ST depend on the reproduction frequency
characteristics of the mounted driver units DU1 and DU2. In particular, the sound S21 from the
driver unit DU2 can be adjusted to a desired characteristic by a plurality of other parameters.
That is, the listening sound ST can be adjusted to a desired characteristic by adjusting the low
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tone range mainly. The plurality of parameters are, for example, the volume and shape of each of
the spaces V2 and V3, the number of openings 16c, the number of each opening area, each
shape and the like, and the cross-sectional area and shape of each of the duct bodies 19 and 20.
Since the space V1 corresponding to the back cavity of the driver unit DU1 is sealed, the back
pressure of the diaphragm DU1a does not change even if a plurality of parameters are changed,
and the sound quality of the sound S11 from the driver unit DU1 changes. It is maintained
without. Therefore, it is possible to easily perform the sound quality adjustment operation from
the low range to the high range in the listening sound ST.
[0049]
The main body structure K1 adopts, for example, a speaker dedicated to the middle to high
frequency range as the driver unit DU1, and improves the quality of middle to high frequency
sounds by the sound S11 emitted as a direct sound from the driver unit DU1, and the driver unit
DU1. Then, the low frequency band not covered is complemented by the sounds S21A and S21B
tuned to the characteristic with sufficient mass by selection of the driver unit DU2 and setting of
a plurality of parameters, and high quality listening sound ST from low frequency to high
frequency It can be provided to the user.
[0050]
Further, when the small diameter speaker of full range is adopted as the driver unit DU1, the
main part structure K1 basically enhances the quality of the sound from low to high by the sound
S11 emitted as the direct sound from the driver unit DU1. At the same time, a bass region which
tends to be insufficient in the small-diameter driver unit DU1 is appropriately compensated by
selecting a driver unit DU2 whose diameter of the diaphragm is larger than that of the driver unit
DU1 or setting of a plurality of parameters. It is possible to provide the user with a high quality
listening sound ST from low to high frequencies by complementing the sounds S21A and S21B
tuned to the characteristic.
[0051]
In the headphone described in Patent Document 1, a plurality of driver units are disposed in the
same spherical portion (corresponding to a baffle plate) in the cover in the main body portion, so
even if it is a driver unit for bass, Only a small diameter driver unit can be arranged so as not to
interfere with the driver unit of
Therefore, it is difficult to expect such an effect in terms of the improvement of the volume and
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16
the sound quality of the bass range.
On the contrary, when the large diameter driver unit is adopted, the portion corresponding to the
baffle plate becomes large and the main body portion becomes large, which may deteriorate the
wearing feeling. On the other hand, in the headphone 51 of the embodiment, since the driver unit
DU2 is disposed on the back side of the driver unit DU1, the baffle plate does not become large
and the main body does not become large. Therefore, there is no possibility that the wearing
feeling is impaired.
[0052]
In the headphone described in Patent Document 2, the back pressure of the diaphragm changes
in accordance with the specifications (volume, shape, etc.) of a space (air chamber) and a duct
provided in the main body as a bass reflex structure. That is, the direct sound output from the
driver unit largely depends on the specifications of the space (air chamber) and the duct provided
as the bass reflex structure. The space (air chamber) and the duct provided in the main body
portion become projecting portions on the appearance, and the main body portion becomes
large, and there is a possibility that the wearing feeling may be lost. On the other hand, in the
headphone 51 of the embodiment, the direct sound output from the driver unit DU1 is not
affected by the sound output from the driver unit DU2 and does not depend on the specifications
of the air chamber and the duct at all. Further, in the headphone 51 of the embodiment, the air
chamber VA3 is provided radially outside of the driver unit DU1, and the air chamber VA2 and
the air chamber VA3 are provided in parallel in the radial direction. Thereby, the main body 1
can be configured to be extremely compact. As described above, the main body structure K1 and
the headphones 51 provided with the same can make high-quality reproduced sound without
increasing the size of the main body 1.
[0053]
(Modification 1) The main body structure K1 may be a main body structure K2 as a modification
1 as follows. That is, the arrangement of the air chamber VA2 and the air chamber VA3 through
which the sound S21 from the driver unit DU2 passes may be reversed in the radial direction.
FIG. 12 is a cross-sectional view schematically showing a body portion structure K2 of the first
modification. The main body portion structure K2 includes two driver units DU1 and DU2 in the
main body portion 1A as in the main body portion structure K1.
10-05-2019
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[0054]
Similarly to the embodiment, the driver unit DU1 is disposed with the diaphragm DU1a facing the
front side, and the drive system for driving the diaphragm DU1a is mounted in the posture
disposed on the rear side of the diaphragm DU1a. Of the sounds generated by the vibration of
the diaphragm DU1a, only the sound S11 emitted to one side is emitted to the external space V5.
Release of the sound S11 to the external space V5 is directly performed without passing through
the air chamber. That is, the sound S11 is emitted to the outside space V5 as a direct sound. The
sound S12 emitted to the other side is emitted to the space V21. Since the air chamber VA21
forming the space V21 is sealed, the sound S12 is not emitted to the external space V5.
[0055]
Similarly to the embodiment, the driver unit DU2 is disposed with the diaphragm DU2a facing the
front side, and a drive system for driving the diaphragm DU2a is mounted in a posture disposed
on the rear side of the diaphragm DU2a. Of the sounds generated by the vibration of the
diaphragm DU2a, only the sound S21 emitted to one side passes through the air chamber VA22
and the air chamber VA23 provided in series in this order, and provided in parallel in the air
chamber VA23. The ducts 29a and 29b are emitted to the external space V5 as sounds S21C and
S21D, respectively. That is, the sound S21 is emitted to the external space V5 as the sounds S21C
and S21D that are not direct sounds but air-chamber-passing sounds that have passed through
the air chamber. The air chamber VA22 and the air chamber VA23 are connected air chambers,
and the air chamber VA22 is at the first stage, and the air chamber VA23 is at the second stage,
in the order of the progress of the sound S11. On the other hand, the sound S22 emitted to the
other side is emitted to the space V24. Since the air chamber VA24 forming the space V24 is
sealed, the sound S22 is not emitted to the external space V5.
[0056]
In the main body portion structure K2, the air chamber VA22 is connected to the flat cylindrical
space V22a including the drive axis CLDU2 of the driver unit DU2 and orthogonal thereto, and is
connected to the peripheral side of the space V22a to form a ring along the drive axis CLDU2.
And an extending space V22b. On the other hand, the air chamber VA23 is provided so as to
form a substantially donut-shaped space V23 inside the space V22b in the radial direction. That
is, the air chamber VA22 and the air chamber VA23 are provided such that at least the air
10-05-2019
18
chamber VA23 is located radially inward of the air chamber VA22. Further, the air chamber
VA23 is provided radially outside of the driver unit DU1.
[0057]
Between the air chamber VA22 and the air chamber VA23, a disk-shaped wall 27a orthogonal to
the drive axis CLDU2 and a wall 27b connected to the periphery of the wall 27a and extending
circumferentially around the drive axis CLDU2 It is divided. The space V22 of the air chamber
VA22 and the space V23 of the air chamber VA23 communicate with each other through an
opening 26c provided on the wall 27b and having a predetermined opening area. The
specification (the number, the opening area, the opening position, and the like) of the opening
26c is not limited, and can be appropriately selected and set. The sound S21 output from the
driver unit DU2 is configured to pass through the opening 26c from the space V22 inward from
the radially outer side and enter the space V23.
[0058]
(Modification 2) The main body structure K1 may be a main body structure K3 as a modification
2 as follows. That is, the air chamber VA32 and the air chamber VA33 through which the sound
S21 from the driver unit DU2 passes may be juxtaposed not in the radial direction but in the
direction along the drive axis CLDU2 of the driver unit DU2.
[0059]
FIG. 13 is a cross-sectional view schematically showing a body portion structure K3 of the second
modification. The main body portion structure K3 includes two driver units DU1 and DU2 in the
main body portion 1B as in the main body portion structure K1.
[0060]
Similarly to the embodiment, the driver unit DU1 is disposed with the diaphragm DU1a facing the
front side, and the drive system for driving the diaphragm DU1a is mounted in the posture
disposed on the rear side of the diaphragm DU1a. Then, of the sounds generated by the vibration
10-05-2019
19
of the diaphragm DU1a, only the sound S11 emitted to one side is emitted to the external space
V5. Release of the sound S11 to the external space V5 is directly performed without passing
through the air chamber. That is, the sound S11 is emitted to the outside space V5 as a direct
sound. The sound S12 emitted to the other side is emitted to the space V31. Since the air
chamber VA31 forming the space V31 is sealed, the sound S12 is not emitted to the external
space V5.
[0061]
Similarly to the embodiment, the driver unit DU2 is disposed with the diaphragm DU2a facing the
front side, and a drive system for driving the diaphragm DU2a is mounted in a posture disposed
on the rear side of the diaphragm DU2a. Then, among the sounds generated by the vibration of
the diaphragm DU2a, only the sound S21 emitted to one side passes the air chamber VA32 and
the air chamber VA33 provided in series in this order, and the air chamber VA33 is parallel The
duct bodies 39a and 39b provided in the control unit are respectively emitted as sounds S21E
and S21F to the external space V5. That is, the sound S21 is emitted to the external space V5 as
the sounds S21E and S21F that are not direct sounds but air-chamber-passing sounds that have
passed through the air chamber. The air chamber VA32 and the air chamber VA33 are connected
air chambers, and the air chamber VA32 is at the first stage, and the air chamber VA33 is at the
second stage, in the order of the progress of the sound S11. On the other hand, the sound S22
emitted to the other side is emitted to the space V34. Since the air chamber VA34 forming the
space V34 is sealed, the sound S22 is not emitted to the external space V5.
[0062]
In the main body portion structure K3, the air chamber VA32 is provided to form a flat
cylindrical space V32 through which the drive axis line CLDU2 of the driver unit DU2 passes
orthogonally. On the other hand, the air chamber VA33 is provided on the front side of the space
V32 so as to form a donut-shaped space V33 surrounding the drive axis line CLDU2. Further, the
air chamber VA33 is provided radially outward of the driver unit DU1.
[0063]
The air chamber VA32 and the air chamber VA33 are separated by a disk-shaped wall 37
orthogonal to the drive axis CLDU2. The space V32 of the air chamber VA32 and the space V33
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20
of the air chamber VA33 communicate with each other through an opening 36c provided on the
wall 37 and having a predetermined opening area. The specification (the number, the opening
area, the opening position, and the like) of the opening 36c is not limited, and can be
appropriately selected and set. The sound S21 output from the driver unit DU2 passes through
the opening 36c from the space V32 along the drive axis CLDU2 from the rear side to the front
side and enters the space V33.
[0064]
In the body portion structure K2 of the first modification and the body portion structure K3 of
the second modification, the ducts 29a and 29b and the outlets of the ducts 39a and 39b are
output as the sound S11 of the driver unit DU1. It is opened in the front surface 13f of the baffle
plate 13 which is the surface to be formed. Thus, the sound S11 is a direct sound from the driver
unit DU1, and the bass rich sounds S21C, S21D (Modified example 1) or the sounds outputted
through the double bass reflex type and Kelton type sound emission structure from the driver
unit DU2. S21E and S21F (Modification 2) are mixed in the front space V6 of the baffle plate 13,
and become the listening sound ST of the characteristic mutually complemented.
[0065]
According to the main body structure K2 of the first modification and the main body structure K3
of the second modification, as in the case of the main body structure K1, the air chamber and the
duct are as compact as possible without making the external appearance projecting portion Can
be formed.
[0066]
Further, according to the main body portion structure K2 and the main body portion structure
K3, as with the main body portion structure K1, the frequency characteristic of the listening
sound ST corresponds to the reproduction frequency characteristic of the mounted driver units
DU1 and DU2.
In particular, the driver unit DU2 to the sound S21 can be adjusted to a desired characteristic by
a plurality of other parameters. That is, the listening sound ST can be adjusted to a desired
characteristic by adjusting the low tone range mainly.
10-05-2019
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[0067]
The plurality of parameters include, for example, the volume and shape of each of the spaces
V22 and V23 or the spaces V32 and V33, the number of openings 26c or openings 36c, the area
of each opening, each shape, and the like, and the duct body 29a or 29b or They are the crosssectional area, the shape, etc. of each duct body 39a, 39b.
[0068]
Therefore, the main body structure K2 of the first modification and the main body structure K3
of the second modification are the same as the main body structure K1, the listening sound ST
being the reproduced sound without increasing the size of the main body 1A and the main body
1B. Can be of high quality.
[0069]
In FIGS. 11 to 13, the magnitudes of arrows indicating the sounds S11, S12, S21, S22, S22A, and
S22B do not reflect the volume.
[0070]
(Modification 3) The first-stage air chamber and the second-stage air chamber in the embodiment
and the modifications 1 and 2 are partitioned so as to have a plurality of air chambers in the
circumferential direction. May be
In the third modification, the main body structure K1 will be described as a representative
example of the original structure. The air chamber VA3 is divided into a plurality of small air
chambers in the circumferential direction, and a duct is provided in each small air chamber. It is
also good.
[0071]
The main-body-part structure K4 of this modification 3 is demonstrated with reference to FIG.14
and FIG.15.
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22
FIG. 14 is a cross-sectional view at the S3-S3 position in FIG. 11, and FIG. 15 is a schematic view
of the main body 1C in the main body structure K4 viewed from the front side with the ear pads
removed.
[0072]
In the body portion structure K4, the air chamber VA3 formed in a donut shape in the body
portion structure K1 is divided at predetermined intervals (here, at equal intervals of about 120
° in the circumferential direction) by a plurality of partition walls 48 extending in the radial
direction. And the small air chambers VA3a, VA3b, VA3c.
The space V2 of the air chamber VA2 and the spaces V3a to V3c of the small air chambers VA3a
to VA3c are communicated with each other by openings 46a1 to 46a3 formed in the base 16a of
the driver base 16. Further, duct bodies 49a to 49c are provided in the small air chambers VA3a
to VA3c, respectively. The duct bodies 49a to 49c are not limited to those formed to have the
same specifications, and may have specifications different from one another. The ducts 49a to
49c are not limited to the arrangement in which the opening directions of the inlets 49a3 to
49c3 face the same direction in the circumferential direction, and may be arranged to face
different directions.
[0073]
The outline of the layout on the sound emitting side (front side) of the main body portion 1C in
the main body portion structure K4 is shown in FIG. In FIG. 15, the driver unit DU1 having the
diaphragm DU1a is disposed at the center of the baffle plate 43 corresponding to the baffle plate
13, and the sound passing through the duct bodies 49a to 49c from the driver unit DU2 is
around the diaphragm DU1a. The duct sound emitting parts 43e to be output are provided, for
example, concentrically at equal angular intervals so as to open as the through holes 43e1 to
43e3.
[0074]
The structure provided with the small air chamber shown in the third modification is one of the
structures for optimizing the characteristics of the listening sound ST, and the application of this
structure does not increase the size of the main portion 1C. .
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[0075]
Each embodiment and each modification of the present invention are not limited to the abovementioned composition, and it is needless to say that it may be another modification in the range
which does not deviate from the gist of the present invention.
[0076]
For example, in the embodiment, the number of duct bodies provided at the second stage as the
duct bodies 19 and 20 is not limited to two.
It may be one or three or more.
Further, when a plurality of duct bodies have the same specification, the position of the inlet of
the through hole of the duct body is the distance from the position of the opening connecting the
first air chamber and the second air chamber. It is preferable to set a predetermined relationship.
A specific example will be described with reference to FIG. 16 with the body portion structure K1
of the example as a representative.
[0077]
FIG. 16 is a view in which the openings 16c1 to 16c3 formed in the base 16a of the driver base
16 so as to be separated in the circumferential direction are expanded in the circumferential
direction into a linear shape in the left and right direction. In FIG. 16, the duct bodies 19 and 20
are also schematically illustrated with the openings 16 c 1 to 16 c 3 being associated with the
positions in the circumferential direction.
[0078]
As shown in FIG. 16, from the opening position of each of the three openings 16c1 to 16c3
between the first stage air chamber VA2 and the second stage air chamber VA3, the through hole
19a1 of the duct body 19 is obtained. The spatial distance to the position of the inlet 19a3 is
distance LAp (p: an integer of 1 to 3), and the spatial distance to the position of the inlet 20a3 of
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the through hole 20a1 of the duct body 20 is distance LBq (q: 1 to 3) Integer)). In this case, it is
preferable that LBq equal to each distance LAp be always present one to one. As a precondition
of this relationship, it is necessary that the distances from the drive center of the driver unit DU2
to the openings 16c1 to 16c3 be approximately equal. The precondition is that in the main body
structure K1, the openings 16c1 to 16c3 are provided in the base 16a corresponding to the
circumference of the driver base 16 whose axis is the drive axis line CLDU2 of the driver unit
DU2. Is satisfied by
[0079]
As shown in FIG. 16, the relationship between the distances is such that the distance LA1 is equal
to the distance LB1, the distance LA2 is equal to the distance LB3, and the distance LA3 is equal
to the distance LB2. In order to satisfy this relationship, the other opening 16c2 and the inlet
19a3, and the other opening 16c3 and the inlet 20a3 with respect to the center line CL13
orthogonal to the circumferential direction (left and right direction in FIG. 16) passing through
the opening 16c1. , Are arranged symmetrically.
[0080]
By this symmetrical arrangement, the phase at the time of reaching the inlet 19a3 and the phase
at the time of reaching the inlet 20a3 of the sound S21 having passed through the respective
openings 16c1 to 16c3 match. Therefore, the sound S21A emitted from the outlet 21d of the
duct joint 21 of the duct body 19 to the external space V5 and the outlet 21d of the duct joint 21
of sound emitted from the outlet 21d of the duct joint 21 of the duct body 20 to the external
space V5 And the sound S21B output to the external space V5 is a sound in phase with each
other, and the listening sound ST has higher quality. This concept can also be applied if the
number of openings or the number of ducts is different, in which case the listening sound ST is
likewise of high quality.
[0081]
An opening 16c for communicating the first stage air chamber VA2 with the second stage air
chamber VA3 corresponds to a so-called double bass reflex duct. Therefore, the length of the
duct is not limited to the thickness of the base 16a (including the thickness if the cylinder 18 is
included) described in the embodiment and the like. That is, you may provide ducts, such as
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arbitrary length and opening area, as the opening part 16c.
[0082]
The cylinder 18 may not be a ring connected completely. The cylinder 18 may be formed as a
substantially C-shaped ring member partially having a slit or as an arc-shaped member. However,
since the vibration of the driver base 16 accompanying the operation of the driver unit DU2 is a
vibration that expands / contracts the diameter of the base portion 16a of the driver base 16, the
cylinder 18 has a ring shape completely connected in view of the vibration suppression. That is,
what can suppress expansion-contraction deformation ¦ transformation of the diameter of the
base 16a of the driver base 16 is desirable.
[0083]
In the main body portion structures K1 to K4, the driver unit DU2 may be arranged in a posture
reverse to the posture described above, that is, in a posture in which the diaphragm DU2a is on
the rear side and the drive system is on the front side. In this case, wiring is performed such that
the audio signal input to the driver unit DU2 is in reverse phase to the audio signal input to the
driver unit DU2. Further, the driver unit DU2 is disposed in the reverse posture, that is, in a
posture in which the sound S21 is output to the rear side, and the sound S21 is emitted to the
front space V6 through the multistage air chamber and duct portion. The layout of the multistage
air chamber may be set based on the main body structure K1 to K4. In this case, wiring is
performed such that the audio signal input to the driver unit DU2 has the same phase as the
audio signal input to the driver unit DU2.
[0084]
The sound emitting device HS can be used not only for the above-described overhead type
headphones 51 but also for various types of headphones. For example, the main unit 51Aa of the
inner-ear type headphone 51A as shown in FIG. 17 (a) and the headphone 51B of the ear-hook
type provided with an ear-hook unit 51Ba as shown in FIG. 17 (b) It is applicable also as mainbody part 51Bb. Further, the sound emitting device HS is not limited to headphones, and is
connected to a device KT capable of outputting an audio signal such as a PC (personal computer),
a portable music reproducing device, or a portable telephone as shown in FIG. Also, it can be
mounted on a sound reproduction device 52 such as a speaker device for emitting the sound
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signal from the device KT as a sound that propagates in space to both ears and reaches.
[0085]
Each space in the embodiment and each modification may not be completely sealed, and adjacent
spaces may be communicated with each other by a minute gap in order to improve the driving of
the diaphragms DU1a and DU2a.
[0086]
The above-mentioned embodiment and each modification can be freely combined with each
other to the extent possible.
[0087]
1, 2A to 1C Main body (sound emitting device), 1J connector 3 Headband 4 Code (signal supply
part) 11 Main case 11a Opening side wall, 11a1 outer side, 11b Intermediate wall 11c Bottom
wall, 11d Inner surface 11e Rib 12 Ornament 13 Baffle plate 13a Flange 13b Rear surface 13c
Peripheral wall 13d Sound emitting portion 13e, 43e Duct sound emitting portion 13e1, 13e2
Through hole 13f Front 14 Ear pad 14a Ear rest 14b Blindfold 15 Cover 16 Driver base 16a
Base, 16b Flange 16c, 16c1 to 16c3, 46a1 to 46a3 Opening, 16d Recess 16e Outer peripheral
surface 17 Seal ring 18 Cylinder, 18a Outer peripheral surface, 18c1 to 18c3 Opening 19, 20,
29a , 29b, 39a, 9b, 49a to 49c duct body 19a, 20a base portion, 19a1, 20a1 through hole 19a2,
20a2 straight portion, 19a3, 20a 3, 49a3 to 49c3 inlet 21 duct joint 21a main body, 21b
through hole (through passage), 21c joint portion 21d Exit, 21e Stepped portion 27a, 27b, 37
Wall 43e1 to 43e3 Through hole 46a1 to 46a3 Opening portion 48 Partitioning wall 51, 51A,
51B Headphones 52 Sound reproduction device CL13 Center line, CL16 Center axis, CLDU2
Drive axis Da Diameter, Db , Dc Outer diameter DT duct part DU1, DU2 driver unit, DU1a, DU2a
diaphragm HS sound emitting device K1 to K4 body part structure LAp, LBq distance S11, S12,
S21, S22, S22, S21A to S21F sound, ST listening Sound V1 to V4, V21 to V24, V22a, V22b, V31
to V34, V3a to V3c Spaces VA1 to VA4, VA21 to VA24, VA31 to VA34 Air chambers VA3a to
VA3c Small air chamber V5 External space, V6 Forward space θ1 to θ4 angle
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