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JP2008066976

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DESCRIPTION JP2008066976
An object of the present invention is to form an opening in a housing containing a drive unit,
close the opening with a diaphragm, and switch between an open air type and a closed type to be
used as a closed type headphone. Eliminate the lid closing the opening and its opening and
closing mechanism. A braking member (37) is provided which can be in contact with and
separated from a diaphragm (30) attached to a portion of the opening (28) of a housing (10). By
making the damping member 37 in contact with the diaphragm 30, the vibration can not be
transmitted through the diaphragm 30, thereby using it as a closed type. [Selected figure] Figure
5
ヘッドホン
[0001]
The present invention relates to a headphone for reproducing sound, and more particularly to a
headphone in which a drive unit is disposed in a housing.
[0002]
When listening to music etc. while preventing sound leakage to the outside, headphones have
been widely used conventionally.
Such headphones are designed to mount a drive unit consisting of a small speaker in a housing,
and are classified into an open air type and a closed type by the structure of the housing
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provided so as to surround the back side of the drive unit. Ru.
[0003]
An open air type headphone is a headphone in which an opening is formed in a housing, and
such an opening allows sound from the outside to enter into the housing. On the other hand, the
closed type headphone is characterized in that the housing that houses the drive unit is sealed,
the characteristics extend to the low range, and the balance between high and low tones is good.
[0004]
The above-mentioned open air type headphone having an opening formed in the housing has an
external sound coming in to make the user feel fresh. However, according to the open air type
structure, there is a tendency that the braking of the low frequency range is insufficient, the
sound pressure of the low frequency becomes too high, and the balance between high and low
frequencies is deteriorated.
[0005]
On the other hand, the closed type headphone can eliminate the above-mentioned insufficient
braking with the low tone, has a good balance between high tone and low tone, and has an
advantage that the characteristics extend to the low tone range. However, since the housing is
sealed, no sound comes from the outside, and a fresh hearing can not be obtained. In addition,
the closed headphones may leave safety problems because the external sound is completely cut
off.
[0006]
Therefore, the inventor of the present application is required to form an opening in the housing
and close the opening with a diaphragm in the headphone provided with a housing so as to
surround the back side of the drive unit according to JP-A-6-113384. In accordance with the
above, a headphone is proposed in which a lid is attached to the opening so as to be freely
opened and closed.
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[0007]
According to such headphones, when the lid is removed, the diaphragm provided so as to close
the opening is transparent to extraneous sound, in particular extraneous sound in the high range,
and this diaphragm is resonant at its resonance. It becomes a resistance to sounds lower than the
frequency, which makes it possible to suppress the sound pressure in the bass region from
becoming higher than necessary.
In addition, if the opening is closed with a lid if necessary, the housing becomes equivalent to a
closed structure, which enables it to be used as a closed type headphone, and it is possible to
shutter out the leakage of reproduced sound completely.
[0008]
However, according to the headphone in which the opening formed in the housing is covered
with the diaphragm and the opening is detachably closed with the lid, the opening and closing
mechanism of the lid is required, and such an opening and closing mechanism is The storage
space must be secured, which increases the size of the housing. This prevents the headphones
from being made compact. Japanese Patent Application Laid-Open No. 6-113384
[0009]
An object of the present invention is to provide a headphone which can be used by arbitrarily
switching between an open air type headphone and a closed type headphone.
[0010]
Another object of the present invention is to obtain a refreshing sense of hearing and eliminate
the lack of braking in the low range to prevent the balance between high and low tones from
being deteriorated, and both the open air type and the closed type. It is to provide a headphone
with an advantage.
[0011]
Still another object of the present invention is to provide a headphone which can be switched
between an open air type and a closed type without using a lid for openably closing an opening
formed in a housing. It is.
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[0012]
Yet another object of the present invention is to provide a more compact headphone as well as
having a simple structure by eliminating the lid for opening and closing the opening formed in
the housing and its opening and closing mechanism. .
[0013]
The above-described problems and other problems of the present invention will be made clear by
the technical idea of the present invention described below and the embodiments thereof.
[0014]
The main invention of the present application is a headphone in which a drive unit is disposed in
a housing, wherein an opening is formed in the housing, a diaphragm is disposed to close the
opening, and contact and separation with the diaphragm is possible. A damping member is
provided, and when the damping member is separated from the diaphragm, sound transmission
from the inside to the outside of the housing is performed through the opening through the
diaphragm, and the damping member is brought into contact with the diaphragm. The present
invention relates to a headphone characterized in that a diaphragm is damped to prevent
transmission of sound through the diaphragm.
[0015]
Here, the opening may be formed in the housing on the back side of the baffle plate on which the
drive unit is mounted.
Also, a ring-shaped rib may be formed inside the housing corresponding to the opening of the
housing, and the diaphragm may be attached to the rib via a pressing ring.
Further, the damping member may be slidably attached to the opening of the housing, and the
damping member may be switched between a contact state and a separation state with respect to
the diaphragm in accordance with the sliding position of the damping member. .
The damping member may include a knob and a pressing element connected to the knob, and the
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diaphragm may have a flat recess substantially at the center thereof, and the pressing element
may be at the center of the recess. The diaphragm may be vibrated, and the diaphragm may be
damped when the pressing element contacts the outer peripheral side of the recess.
Further, the damping member is provided so as to be able to retract in the opening of the
housing, and when the damping member is pushed in, the diaphragm is in contact with the
diaphragm to damp the diaphragm, and the pushing of the damping member is released to
return. The diaphragm may then be freed.
Further, a plurality of diaphragms are disposed to close the opening of the housing, and all the
diaphragms are damped according to the switching of the damping member, and some
diaphragms are damped. All diaphragms may be switched free.
The diaphragm is concentrically provided with a plurality of bending edges, and when the
contact position by the damping member is on the center side of the most central edge of the
plurality of edges, the diaphragm is damped, When the contact position by the damping member
is on the outer peripheral side of the most central edge, the region inside the central edge closest
to the contact position may be free.
[0016]
In a preferred embodiment of the present invention, a housing is provided so as to surround the
back side of the drive unit of the headphone, an opening is formed in the housing, and the
diaphragm is contacted with a solid in the headphone. Alternatively, a mechanism for controlling
the vibration of the diaphragm is provided by releasing the solid.
[0017]
According to such a structure, for example, by bringing a solid object provided at the tip into
contact with a diaphragm using a knob, the diaphragm is equivalent to an opening / closing
mechanism of a lid having a lid attached to an opening closed by the diaphragm. Effects can be
realized.
Moreover, since this structure is more compact than the lid opening / closing mechanism, more
compact headphones can be provided.
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[0018]
The main invention of the present application is a headphone in which a drive unit is disposed in
a housing, wherein an opening is formed in the housing, a diaphragm is disposed to close the
opening, and damping can be contacted and separated with respect to the diaphragm A member
is provided, and when the damping member is separated from the diaphragm, sound
transmission from inside and outside of the housing is performed through the opening through
the diaphragm, and when the damping member is brought into contact with the diaphragm, the
diaphragm is damped and the diaphragm is interposed. Sound transmission is not performed.
[0019]
Therefore, according to such a headphone, by separating the damping member provided so as to
be in contact with and separated from the diaphragm from the diaphragm, sound comes from the
outside through the opening through the diaphragm, This makes it possible to obtain a
refreshing sense of hearing and to eliminate the lack of braking in the low range and to prevent
the balance between high and low tones from deteriorating.
On the other hand, when the above-mentioned damping member is brought into contact with the
diaphragm, the diaphragm is damped and transmission of sound is not performed via this
diaphragm, and the balance between the high sound and the low sound is good and the
characteristics up to the low sound range Can be used as a closed type headphone. Therefore,
according to such a configuration, there is no need for a lid for closing the opening particularly
for use as a closed type headphone, and the opening and closing mechanism thereof is not
required.
[0020]
Hereinafter, the present invention will be described by way of the illustrated embodiments. FIGS.
1 and 2 show a headphone according to an embodiment of the present invention, and the
headphone comprises a pair of left and right housings 10. The housing 10 is a housing whose
inside is a recess. The housing 10 is rotatably supported by the hanger 11. The hanger 11 is
provided with a substantially U-shaped slide arm 12 so as to extend upward.
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[0021]
The slide arm 12 is slidably coupled to the stopper 13. The left and right stoppers 13 are
connected by the head band 14. And, as shown in FIG. 2, a cord 15 is drawn out to a hanger 11
of one of the housings 10 on the right side, for example. The cord 15 causes an audio signal to
flow to the voice coil of the drive unit in the housing 10.
[0022]
Next, the internal structure of the housing 10 will be described with reference to FIG. Inside the
housing 10, a baffle plate 19 is attached integrally or by another member so as to cover an
opening on the front side of the housing 10, and the drive unit 20 is supported by the baffle
plate 19 There is. Here, the drive unit 20 is composed of, for example, a dome-shaped dynamic
speaker. A sound hole 21 is formed in the baffle plate 19, and a non-woven fabric 22 is attached
to close the sound hole 21. Further, an ear pad 23 is attached to the opening edge of the housing
10. The ear pad 23 is covered by a cover 24.
[0023]
A relatively small vertically elongated opening 28 is formed on the back side of the drive unit 20
of the housing 10 housing the drive unit 20 and at the upper position thereof. Inside the opening
28, as particularly shown in FIGS. 3 and 4, a ring-shaped rib 29 is formed on the opposite inner
surface at a position corresponding to the outer periphery of the opening 28. The diaphragm 30
is attached by the ring-shaped rib 29. The diaphragm 30 is formed of, for example, a molded
body of polypropylene resin, and a fixing ring 31 is attached to a portion on the outer peripheral
side thereof. The outer peripheral portion of the diaphragm 30 is adhered and fixed to the step
portion 32 of the ring-shaped rib 29 by the fixing ring 31.
[0024]
A sliding plate 36 is attached to the inside of the opening 28 of the housing 10 as shown in FIGS.
4 and 5. The sliding plate 36 integrally includes a pressing element 37 so as to protrude inward.
A sliding plate 36 having a pressing element 37 is connected to a knob 38 disposed outside the
opening 28 of the housing 10. That is, the connection projection 39 is formed on the lower side
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of the knob 38, and the screw 40 penetrating the screw insertion hole of the slide plate 36 is
screwed into the female screw hole formed at the center of the connection projection 39. It is
worn and thereby couples the knob 38 to the slide plate 36. Furthermore, a positioning pin 41 is
formed on the lower surface of the knob 38, and the positioning pin 41 is engaged with the small
hole 42 on the upper surface of the sliding plate 36, whereby relative rotation between the knob
38 and the sliding plate 36 To prevent.
[0025]
Thus, the knob 38 connected to the slide plate 36 by the screw 40 is received in the sliding
recess 44 in which the step 43 of the outer side portion is formed in the peripheral edge of the
opening 28, thereby sliding with the knob 38 The plate 36 slides along the length of the opening
28. Further, an elastic deformation portion 45 is continuously provided on the side surface side
of the sliding plate 36, and the projection 46 of the elastic deformation portion 45 can be
received in the concave portion 48 of the rib 47 formed on the lower surface of the housing 10.
Thus, the click structure of the sliding position of the knob 38 and the sliding plate 36 is
achieved.
[0026]
Therefore, as shown in FIGS. 5A and 5B, the pusher formed on the lower surface of the sliding
plate 36 by sliding the knob 38 together with the sliding plate 36 in the sliding recess 44 of the
opening 28 of the housing 10 37 can be switched to a substantially central position of the
diaphragm 30 as shown in FIG. 5A and a position biased to the left with respect to the
substantially central portion of the diaphragm 30. As shown in FIG. 5A, in the case where the
knob 38 is on the right side and the pressing element 37 is located at the center of the
diaphragm 30, this pressing element is formed by the flat inverted conical shape of the
diaphragm 30. 37 separates from the diaphragm 30. Accordingly, the diaphragm 30 is in a free
state, and the damping by the pressing element 37 is not performed. On the other hand, when
the knob 38 is moved to the left as shown in FIG. 5B, the pressing element 37 moves to the left
with respect to the central portion of the diaphragm 30, and abuts on the left inclined surface of
the diaphragm 30. Therefore, the diaphragm 30 contacts with the pressing element 37 and
damping is performed. Therefore, the external sound from the opening 28 can not be transmitted
to the inside of the housing 10 through the vibration of the diaphragm 30. That is, the damping
operation of the diaphragm 30 by the pressing element 37 is equivalent to covering the opening
28 of the housing 10.
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[0027]
While wearing this headphone on the head using the headband 14 shown in FIGS. 1 and 2, the
housing 10 is placed on the left and right ears, respectively, so that the ear pad 23 is in contact
with the ears. The drive unit 20 then reproduces the sound by passing current through the cord
15 to the voice coil of the drive unit 20 supported by the baffle plate 19 of the housing 10.
Therefore, such sound can be heard by this headphone.
[0028]
When the diaphragm 30 attached so as to close the opening 28 of the housing 10 is separated
from the pressing element 37 as shown in FIG. 5A, it can be used as an open air type headphone.
FIG. 6 shows the transfer characteristics of extraneous sound in the case of listening as such an
open air type headphone. Compared with the vibration suppression state indicated by the dashed
line in the same figure, the headphone in the state in which the vibration suppression indicated
by the solid line is released has higher transmission characteristics of extraneous sound
particularly in the vicinity of the resonance frequency of the diaphragm 30 than in the vibration
suppression state. Here, the vibration characteristic of the diaphragm 30 is set to a resonance
frequency of 1 to 2 KHz, and in the vicinity of this frequency, the diaphragm 30 performs a
conductive acoustic operation to allow the intrusion of extraneous sound. Therefore, according to
such a headphone, it is possible to obtain a refreshing feeling, which is a feature of the open air
type, by particularly allowing the entry of foreign sounds.
[0029]
Diaphragm 30 acts as stiffness and provides a resistive acoustic action to frequencies in the low
range. That is, the increase in the sound pressure in the low range is suppressed. Therefore, as
indicated by the solid line in FIG. 7, the sound pressure in the low tone range is prevented from
rising abnormally, and the balance between the high tone range and the low tone range becomes
good. It should be noted that if the opening 28 is formed in the housing 10 and the diaphragm
30 is not attached, the characteristics shown by the alternate long and short dash line in the
figure are obtained, and the sound pressure output in the low range becomes high to balance the
high range and the low range. It will be worse. Such a drawback can be eliminated by attaching
the diaphragm 30 to the opening 28, resulting in similar frequency characteristics as the closed
type. This makes it possible to obtain good characteristics up to the low range which is the
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feature of the closed type.
[0030]
Moreover, according to such headphones, a lid for closing the opening 28 is not required.
Therefore, the lid opening / closing mechanism is also inevitably omitted. Accordingly, such lids
and lid opening / closing mechanisms can be omitted, thereby simplifying the structure of the
headphone, particularly its housing 10, reducing the number of parts, and further reducing the
size of the housing 10, It becomes possible to provide more compact headphones. Further, since
the knob 38 is attached together with the slide plate 36 so as to connect the inside and outside of
the opening 28 by means of the screw 40, the knob 38 will not be lost. Therefore, as in the prior
art, the accident of losing the lid closing the opening is prevented.
[0031]
FIG. 8 shows another embodiment. In this embodiment, instead of the combination of the slidable
knob 38 and the sliding plate 36 for closing the opening 28, a push button structure movable in
the axial direction of the diaphragm 30 is adopted. That is, a holding portion 53 formed of an
arm is continuously provided so as to cross the opening 28 of the housing 10, and the push
button 54 is slidably held by the holding portion 53. The push button 54 is urged upward in FIG.
A pressing element 56 is connected to the end of the push button 54.
[0032]
In the configuration as described above, as shown in FIG. 8A, when the push button 54 held by
the holding portion 53 is returned by the return spring 55, the pressing element 56 on the tip
side of the push button 54 is the diaphragm 30. Away from Therefore, the diaphragm 30 is in a
free state, and the diaphragm 30 is not prevented from transmitting an extraneous sound.
Therefore, the extraneous sound transmitted through the opening 28 is transmitted into the
housing 10 through the vibration of the diaphragm 30, thereby enabling use as an open air type
headphone that allows the extraneous sound to enter. Become.
[0033]
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On the other hand, as shown in FIG. 8B, when the push button 54 is pressed against the return
spring 55 and the pressing element 56 provided at the tip of the push button 54 is brought into
contact with the center of the diaphragm 30, The diaphragm 30 is damped. Accordingly, the
diaphragm 30 can not vibrate, and the diaphragm 30 blocks external noise coming in through
the opening 28. Therefore, in this case, it can be used as a closed type headphone.
[0034]
Next, still another embodiment will be described with reference to FIG. In this embodiment, in
place of the diaphragm 30, a pair of diaphragms 61 and 62 are provided. Here, when the knob
38 is moved back as shown in FIG. 9A, the center of the diaphragm 61 coincides with the
corresponding pressing element 37. On the other hand, the central portion of the diaphragm 62
is biased to the right with respect to the corresponding pressing element 37.
[0035]
Therefore, as shown in FIG. 9B, when the knob 38 is moved by a predetermined stroke, only the
diaphragm 62 is damped by the corresponding pressing element 37, and the other diaphragm 61
is in a state of being separated from the corresponding pressing element. Therefore, it is possible
to damp the other diaphragm 62 while allowing external noise to penetrate through the one
diaphragm 61.
[0036]
As shown in FIG. 9C, when the knob 38 is further slid by a predetermined stroke, both the
diaphragms 61 and 62 come into contact with the corresponding pressing elements, whereby the
diaphragms 61 and 62 are both damped. Therefore, in this case, the external noise does not
enter from the outside through the opening 28, and the housing 10 has a sealed structure. That
is, it is equivalent to closing the opening 28 with a lid.
[0037]
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On the other hand, when the knob 38 is in the position shown in FIG. 9A, the diaphragms 61 and
62 are in a state of being separated from the corresponding pressing elements 37 respectively.
Therefore, in this case, the pair of diaphragms 61 and 62 can vibrate together. Therefore, the
extraneous sound from the opening 28 is guided into the housing 10 through the pair of
diaphragms 61 and 62 and used in a so-called open air state.
[0038]
FIG. 10 shows still another embodiment. In this embodiment, the diaphragm 30 mounted so as to
close the opening 28 comprises two edges 65, 66 concentrically. The two edges 65 and 66 are
the bends of this diaphragm 30, respectively.
[0039]
As shown in FIG. 10A, when the pressing element 37 is present substantially at the center of the
diaphragm 30, the diaphragm 30 is not damped and is in a free state. Therefore, in this case, the
extraneous sound coming through the opening 28 is once converted into the vibration of the
diaphragm 30, and then introduced into the housing 10 to be used as a so-called open air type
headphone.
[0040]
On the other hand, when the knob 38 is moved as shown in FIG. 10B and the pressing element
37 is brought into contact with the vicinity of the edge 66 on the center side of the diaphragm
30, the diaphragm 30 is in a so-called damping state. External sound from the camera is
shuttered out and used as a closed type headphone.
[0041]
When the knob 28 is moved as shown in FIG. 10C and the pressing element 37 is brought into
contact with an intermediate position between the central edge 66 and the outer peripheral edge
65, only the central portion of the central edge 66 Can be vibrated.
In this case, as shown in FIG. 10A, the resonance frequency of the diaphragm 30 is higher than in
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the completely free state, and in particular, only the extraneous sound in the high range is
selectively transmitted. It can be used as a headphone.
[0042]
Although the present invention has been described above by the illustrated embodiment, the
present invention is not limited to the above embodiment, and various modifications can be made
within the scope of the technical concept of the invention included in the present application. For
example, various design changes are possible for the sliding structure of the sliding plate 36 that
constitutes the damping member in the above embodiment. Also, the knob 38 and the sliding
plate 36 can be incorporated in different positions without necessarily being disposed at the
opening 28.
[0043]
The present invention can be used for headphones that can be switched between the closed type
and the open type.
[0044]
It is a front view which shows the structure of the whole headphone.
It is a side view which shows the structure of the whole of the same headphone. It is an expanded
sectional view showing the internal structure of the housing of headphones. It is an exploded
perspective view showing the structure of damping of a diaphragm. It is an expanded sectional
view showing operation of damping of a diaphragm by a damping member. It is a graph which
shows the transfer characteristic of a foreign sound. It is a graph which shows the characteristic
change of the reproduction sound. It is a longitudinal cross-sectional view which shows the
operation | movement of damping of the diaphragm of another embodiment. It is a longitudinal
cross-sectional view which shows the operation | movement of damping of the diaphragm of
another embodiment. It is a longitudinal cross-sectional view which shows the operation |
movement of damping of the diaphragm of another embodiment.
Explanation of sign
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[0045]
DESCRIPTION OF SYMBOLS 10 ... Housing, 11 ... Hanga, 12 ... Slide arm, 13 ... Stopper, 14 ...
Headband, 15 ... Cord, 19 ... Baffle board, 20 ... Drive unit, 21 ... Sound hole, 22 ... Non-woven
fabric, 23 ... Ear pad, 24 ... Cover, 28: Opening, 29: Ring-like rib, 30: Diaphragm, 31: Fixing ring,
32: Step portion, 36: Sliding plate, 37: Pressing element, 38: Knob, 39: Projection for connection,
40: Screws 41 Positioning pins 42 Small holes 43 Steps 44 Sliding recesses 45 Elastic
deformations 46 Projections 47 Ribs 48 Recesses 53 Holders (arms) 54: push button, 55: spring
for return, 56: pressure element, 61, 62: diaphragm, 65, 66: edge
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