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DESCRIPTION JP2011155331

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DESCRIPTION JP2011155331
An object of the present invention is to create an excessive pressure on a diaphragm side by
equalizing pressure between space areas of an ear pad side and a housing side even when
attached or removed under a valve structure capable of determining an acoustic resistance value
with little variation. Providing a headphone unit that prevents the pressure from being applied.
SOLUTION: An ear pad 17 disposed inside a baffle plate 12 to form an inner space L, a housing
19 disposed outside the baffle plate 12 and having an outer space L inside, a baffle plate 12 And
the electroacoustic transducer 22 comprising the diaphragm 37 with the voice coil 38 and the
baffle plate 12 provided in the circumferential direction to form the inner space L and the outer
space L The respective vents 14 for communicating the two are closed by the flexible valve
member 15 which is disposed on the one side and the other side of the baffle plate 12 so as to
allow the bending deformation in the opening direction under substantially the same ventilation
amount. I did. [Selected figure] Figure 1
ヘッドホンユニット
[0001]
According to the present invention, a pressure difference does not occur between the space area
on the ear pad side sandwiching the electro-acoustic transducer and the space area on the
housing side when worn on the auricle side or removed from the auricle side Technology related
to a headphone unit equipped with a pressure adjustment function.
[0002]
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The headphones are usually disposed on the inner side of the baffle plate at the ear pad side
covering the user's auricle, at the outer side of the baffle plate at the housing side, and a pair of
left and right headphones incorporating the electroacoustic transducers necessary for each It has
a unit.
In particular, the closed headphone unit is formed so as to further improve the adhesion to the
auricle in order to improve the sound insulation.
[0003]
By the way, when each headphone unit in this type of headphones is worn on the auricle side or
removed from the auricle side, an outer space ensured by an inner space portion secured by an
ear pad covering the auricle side and a housing There is a pressure difference between the parts.
[0004]
In particular, in each headphone unit in the dynamic headphones, since the voice coil attached to
the diaphragm enters into the magnetic pole and operates, when excessive amplitude is
generated in the diaphragm, it collides with the magnetic pole side and is broken or voice The
coil may pop out of the magnetic pole and fail to return to its original position.
[0005]
The excessive amplitude generated in such a diaphragm is often caused by the pressure
difference generated between the inner space and the outer space mainly generated at the time
of mounting and demounting operation of the headphone unit as described above.
[0006]
FIG. 3 is a diagram of the headphone unit shown in FIG. 4 as a second embodiment in Patent
Document 1 filed by the present applicant in order to eliminate the above-mentioned
inconvenience found in the conventional headphone unit. .
[0007]
JP, 2009-218686, A
[0008]
According to FIG. 3, when the headphone unit 51 is disposed on the inner side of the doughnut-
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shaped baffle plate 52 having the opening 53 at the center and the baffle plate 52 and covers
one ear pin side of the user A housing 55 provided on the outer side of the baffle plate 52 and
having an outer space L2 in the interior thereof, and an electric member disposed through the
opening 53 of the baffle plate 52. And an acoustic transducer 56.
[0009]
In this case, the electro-acoustic transducer 56 has an opening 58 smaller in diameter than the
opening 53 of the baffle plate 52 at the central portion and is supported by the opening edge 53
a of the opening 53 of the baffle plate 52. A yoke 60 having a U-shaped cross section fitted in the
opening 58 of the base frame 57, a magnet 61 and a pole piece 62 disposed inside the yoke 60,
the yoke 60, the magnet 61 and the pole The voice coil 64 disposed in the air gap formed in the
magnetic pole 59 consisting of the piece 62 is provided on the outside thereof, and the
diaphragm 63 is provided on the inside of the base frame 57 with the peripheral portion 63a
thereof fixed. .
The base frame 57 is provided with a sound through hole 57 a whose outside surface is closed
by an appropriate acoustic resistance material 65.
[0010]
Further, in the baffle plate 52, vent holes 52a are formed at a plurality of places in the
circumferential direction.
Each of the vent holes 52a is alternately disposed on one surface side and the other surface side
of the baffle plate 52, and is attached to each fixing portion to the baffle plate 52 with a spacer
66 interposed. The flexible valve members 67 are disposed facing each other.
[0011]
That is, as shown in FIG. 3, when the air pressure of the inner space L1 and the side of the outer
space L2 is L1 = L2 as shown in FIG. Can be made to face the corresponding air holes 52a under
the condition that the space S which is the thickness of the spacer 66 is interposed between the
inner space L1 and the outer space L2 through the air holes 52a. Can be communicated with
each other.
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[0012]
Therefore, if the air pressure on the inner space L1 side and the outer space L2 side is L1> L2,
the flexible valve member 67 disposed on the inner side of the baffle plate 52 is bent in the
opening direction and may be positioned on the outer side. The flexible valve member 67 bends
in the closing direction to eliminate the pressure difference, and if L1 <L2, the flexible valve
member 67 located on the inner side of the baffle plate 52 bends in the closing direction and
conversely, the flexible member located on the outer side The valve member 67 bends in the
opening direction, and the pressure difference can be eliminated.
[0013]
For this reason, according to the headphone unit 1 shown in FIG. 3, the air pressure difference
generated between the inner space L1 side and the outer space L2 side at the time of attachment
or removal thereof is disposed on both sides of the baffle plate 52 Since each flexible valve
member 67 can be opened and closed, the vibration plate 63 collides with the magnetic pole 59
and is damaged or the voice coil 64 does not jump out from the magnetic pole 59 and does not
return to the original position, causing failure. It is possible to prevent the occurrence of
problems such as
[0014]
However, in the case of the headphone unit 1 shown in FIG. 3, since the flexible valve member 67
is attached via the spacer 66, even when it is bent in the closing direction with respect to the
vent hole 52a, A gap is created, and the flexible valve member 67 does not reach the point of
completely closing the vent hole 52a.
[0015]
Therefore, the acoustic resistance related to the vent hole 52a can not be determined uniformly
in consideration of only the relationship with the flexible valve member 67, and the incomplete
closing state of the vent hole 52a by the flexible valve member 67 As a result of having to be
determined in consideration of the above, there is a disadvantage that the number of judgment
factors is increased and the acoustic resistance value is varied.
[0016]
Further, in the headphone unit 1 shown in FIG. 3, since it is necessary to fix the flexible valve
member 67 to the baffle plate 52 side with the spacer 66 interposed, the number of members is
increased by the amount of the spacer 66, and There is also a problem that the installation work
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becomes complicated, which contributes to an increase in product cost.
[0017]
SUMMARY OF THE INVENTION In view of the above problems of the prior art including the
patent document 1, the present invention provides a space area and a housing on the ear pad
side even when mounted or removed under a valve structure capable of determining an acoustic
resistance value with little variation. It is an object of the present invention to provide a
headphone unit in which the air pressure with the side space area is equalized so that excessive
pressure is not applied to the diaphragm side.
[0018]
The present invention has been made to achieve the above object, and is directed to a baffle plate
having an opening, and an inner space which is disposed inside the baffle plate and covers one
ear of the user. A headphone unit comprising at least an ear pad forming a portion, a housing
provided outside the baffle plate and having an outside space inside thereof, and an
electroacoustic transducer provided via the opening of the baffle plate In the above, the acoustic
transducer has an opening, and a base frame supported by the opening of the baffle plate, a
magnetic pole disposed in the base frame via the opening, and an air gap provided in the
magnetic pole. And a voice coil disposed on the inner side of the base frame, and the baffle plate
is provided in the circumferential direction to continuously connect the inner space portion and
the outer space portion. Each of the air vents to be closed is closed by a flexible valve member
disposed on one side and the other side of the baffle plate so as to allow bending deformation in
the opening direction under substantially the same air flow. Make it the most important feature.
[0019]
In this case, it is preferable to use a non-woven fabric that functions as an elastic acoustic
resistance material as the flexible valve material.
[0020]
Among the present inventions, according to the invention as set forth in claim 1, even when
mounting or removing the same, opening under substantially the same air flow rate to one
surface and the other surface of the baffle plate is carried out. The flexible valve members
disposed so as to allow bending deformation in the direction can be opened and closed to
instantly eliminate the difference in air pressure generated between the inner space side and the
outer space side. It is possible to reliably prevent the occurrence of a defect that the plate collides
with the magnetic pole side and is damaged or the voice coil is not ejected from the magnetic
pole and is not returned to the original position to be broken.
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[0021]
In addition, when the flexible valve material is formed of a non-air-permeable flexible film
material, after the pressure difference between the inner space portion side and the outer space
portion side is eliminated, the vent hole of the baffle plate can be opened. Since the flexible valve
material can be tightly closed, acoustic resistance and acoustic characteristics as designed can be
obtained without considering the acoustic resistance of the closed portion.
[0022]
Furthermore, since the flexible valve material can be fixed to the baffle plate without interposing
the spacer as in the conventional example, the number of members can be reduced accordingly
to contribute to simplification and cost reduction of the mounting operation. .
[0023]
According to the invention of claim 2, since the flexible valve member for closing the vent hole of
the baffle plate is formed of the non-woven fabric which functions as an elastic acoustic
resistance member, the diameter of the vent hole and the acoustic resistance per unit area of the
non-woven fabric Since the acoustic resistance is determined only by the value, more stable
acoustic resistance can be obtained.
[0024]
Explanatory drawing which shows the cross-section about one example of this invention.
Explanatory drawing which divides and shows the valve action state about the example of FIG. 1
with (A)-(C).
Explanatory drawing which shows the cross-section about a prior art example.
[0025]
According to FIG. 1 showing the cross-sectional structure of an example of the present invention,
the headphone unit 11 is a doughnut-shaped baffle plate 12 having an opening 13 at the center,
and the headphone plate 11 disposed inside the baffle plate 12 The ear pad 17 forming the inner
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space L1 when covering one of the pinna, the housing 19 provided on the outer side of the baffle
plate 12 and having the outer space L2 therein, and the opening of the baffle plate 12 And an
electro-acoustic transducer 22 disposed via the unit 13.
[0026]
In this case, the electro-acoustic transducer 22 has an opening 24 smaller in diameter than the
opening 13 of the baffle plate 12 at the central portion, and is supported by the opening edge 13
a of the opening 13 of the baffle plate 12. A yoke 34 having a U-shaped cross section to be fitted
into the opening 24 of the base frame 23, a magnet 35 and a pole piece 36 disposed inside the
yoke 34, the yoke 34, the magnet 35 and the pole The voice coil 37 disposed in the air gap
provided in the magnetic pole 33 consisting of the piece 36 is provided on the outside thereof,
and the diaphragm 37 is constituted on the inside of the base frame 23 with the peripheral
portion 37a thereof fixed. .
[0027]
Further, the base frame 23 is provided with sound holes 25 of appropriate diameter at a plurality
of locations in the circumferential direction, and these sound holes 25 are closed from the
outside by the acoustic resistance material 26.
[0028]
On the other hand, the baffle plate 12 disposed so as to separate the inner space L1 and the
outer space L2 is provided with the vent holes 14 drilled at a plurality of locations in the
circumferential direction. The inner space portion L1 and the outer space portion L2 are in
communication with each other.
[0029]
Further, in each of the air holes 14 provided in the baffle plate 12, the arrangement relationship
is alternately located on the side of the inner surface 12a which is one surface of the baffle plate
12 and the side 12b which is the other surface. The flexible valve member 15 is partially bonded
and fixed using an adhesive 16 so as to closely cover the opening surface 14 a of the
corresponding vent 14.
[0030]
In this case, as long as the flexible valve member 15 can completely cover the vent holes 14 of
the baffle plate 12 and can bend in the opening direction with the bonding position by the
adhesive 16 as a fulcrum. There are no particular limitations on the specific surface shape
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including circular, square, etc.
[0031]
In addition, as the flexible valve member 15, it is possible to use a non-air-permeable flexible film
material or a non-woven fabric which is a spring-resistant acoustic resistance material, for
example, a non-woven fabric such as "JH-1004" manufactured by Byrine. it can.
[0032]
Next, the operation of the present invention having the above configuration will be described
with reference to FIGS. 2 (a) to 2 (c), when the headphone unit 11 is not in use or in a state after
wearing. As shown in FIG. 2A, the air pressure in the inner space L1 and in the outer space L2
becomes L1 = L2, and each flexible valve member 15 also has an opening surface 14a of each
vent 14 of the baffle plate 52. The whole can be closed and kept in close contact.
[0033]
Therefore, the acoustic resistance based on each air hole 14 of the baffle plate 52 in the
headphone unit 11 is uniformly determined based on only the diameter of the air hole 14 and
the acoustic resistance value per unit area of the flexible valve member 15. It is possible to
design under stable conditions with little variation.
[0034]
In addition, since the internal pressure of the headphone unit 11 at the time of mounting on the
auricle side is higher than that of the outer space portion L2 on the inner space portion L1 side,
L1> L2 is obtained, as shown in FIG. The flexible valve member 15 disposed on the outer side
surface 12 b side of the baffle plate 52 is bent in the opening direction, and the flexible valve
member 15 disposed on the inner side surface 12 a side of the baffle plate 52 is pressed against
the air hole 14 As a result, the pressure difference can be eliminated by adjusting the pressure so
that L1 = L2.
[0035]
On the other hand, when removing the headphone unit 11 attached to the auricle side, the ear
pad 17 is pulled away from the auricle side, and the internal space L1 side has a lower internal
pressure than the external space L2 side, L1 <L2 Therefore, as shown in FIG. 2C, the flexible
valve member 15 disposed on the outer surface 12b side of the baffle plate 52 is bent in the
opening direction and disposed on the inner surface 12a side of the baffle plate 52. The pressure
difference can be eliminated by adjusting the pressure so that L1 = L2 in a state in which the
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flexible valve member 15 is closed so as to press against the vent hole 14.
[0036]
Therefore, according to the present invention, each flexible valve member 15 disposed on the
inner side surface 12 a and the outer side surface 12 b of the baffle plate 12 can be mounted as
shown in FIG. 2 or (c), the difference between the air pressure generated between the inner space
L1 and the outer space L2 can be eliminated instantaneously. It is possible to reliably prevent the
occurrence of a defect such as breakage due to collision or failure of the voice coil 38 due to
jumping out of the magnetic pole 33 and not returning to the original position.
[0037]
Further, in the case where the flexible valve member 15 is formed of a non-air-permeable flexible
film material, the pressure difference between the inner space portion L1 side and the outer
space portion L2 side is eliminated after the baffle plate 12 is removed. Since the vent hole 14
can be tightly closed by the flexible valve member 15, acoustic resistance and acoustic
characteristics as designed can be obtained without considering the acoustic resistance of the
closed portion.
[0038]
Furthermore, since the flexible valve member 15 can be fixed to the baffle plate 12 without
interposing the spacer shown as a conventional example in FIG. 3, the number of members is
reduced accordingly to contribute to simplification and cost reduction of the mounting operation.
It can be done.
[0039]
Further, when the flexible valve member 15 for closing the vent holes 14 of the baffle plate 12 is
formed of a non-woven fabric that functions as an elastic acoustic resistance material, only the
diameter of the vent holes 14 and the acoustic resistance per unit area of the non-woven fabric
Since the acoustic resistance is determined in this way, the acoustic characteristics and the sound
quality can be further stabilized by making the acoustic resistance value of the closed portion
stable without variation.
[0040]
The above has described the present invention based on the illustrated examples, and the specific
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configuration thereof is not limited to this.
For example, in an example in which the flexible valve member 15 is disposed so as to allow
bending deformation in the opening direction in an arrangement relationship in which the
flexible valve member 15 is alternately positioned on the inner side surface 12a and the other
side surface 12b of the baffle plate 12 Although shown, in any case of L1> L2 and L1 <L2, as
long as bending deformation in the opening direction under substantially the same ventilation
amount is possible, it is possible to alternate It may be disposed instead.
[0041]
11 headphone unit and 12 baffle plate 12a inner side surface 12b outer side surface 13 opening
13a opening edge 14 air vent 14a opening surface 17 ear pad 15 flexible valve member 16
adhesive 19 housing 22 electroacoustic transducer 23 base frame 24 opening 25 Sound hole 26
Sound resistance material 33 Magnetic pole 34 Yoke 35 Magnet 36 Pole piece 37 Diaphragm
37a Peripheral part 38 Voice coil L1 Inner space part L2 Outer space part
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