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JP2015070600

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2015070600
An object is to provide a condenser headphone unit provided with a fixed pole assembly capable
of securing strength while forming a thin reinforcing member and eliminating contact with a
fixed pole based on vibration of a diaphragm. A condenser headphone unit (1) is provided with a
diaphragm (11) and a fixed pole (22) disposed on both sides of the diaphragm (11) and provided
with a plurality of through holes (22a). The back side of each fixed pole 22 with the diaphragm
11 at the center is attached to the reinforcing member 23 on which the concave curved portion
23c is provided. Thereby, the fixed pole assembly 21 in which the concave curved surface 22 b is
formed in the fixed pole 22 is configured, and the concave curved surface 22 b of the fixed pole
22 in the fixed pole assembly 21 faces the diaphragm 11 respectively. Be placed. [Selected
figure] Figure 1
Condenser headphone unit and method of manufacturing fixed pole assembly of condenser
headphone
[0001]
The present invention relates to a condenser headphone unit and a method of manufacturing a
fixed pole assembly of the condenser headphone.
[0002]
The condenser headphone unit generally adopts a push-pull type in which fixed poles are
disposed on both sides of the diaphragm in order to reduce reproduction distortion.
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Then, in this type of condenser headphone unit, while applying a polarization voltage of several
hundred volts to the diaphragm, the diaphragm is vibrated by applying a signal voltage for sound
reproduction to each fixed pole. It is configured to output a wave.
[0003]
In this case, the fixed pole is formed flat, and a plurality of through holes are formed for
transmitting sound waves from the opposing diaphragm. The plurality of through holes are
generally circular, and when the inner diameter of the through holes is large, the effective area of
the fixed pole is reduced, so that the sensitivity as the headphone unit is reduced. For this
purpose, it is necessary to make many through holes with a small inner diameter in the fixed
pole.
[0004]
By the way, when the thickness dimension of the fixed electrode is large, the processability for
drilling the above-mentioned many through holes is deteriorated, and additionally, the length in
the thickness direction of the through holes is increased, This acts as an acoustic mass, causing a
decrease in the sensitivity of the headphone unit. For this purpose, the fixed electrode is formed
by drilling the through hole by mechanical pressing or chemical etching using a metal plate
(generally having a thickness of 0.8 mm or less) thinner than the diameter of the through hole. It
is made to do.
[0005]
The diaphragm is electrostatically driven by an audio signal voltage applied between the
diaphragm and the fixed electrode. For this reason, when the thickness of the fixed pole is thin,
the fixed pole is vibrated by the reaction force of the diaphragm. In order to avoid this, a
reinforcing member is disposed on the fixed pole to employ a means for preventing the vibration
of the fixed pole. (For example, refer to Patent Document 1 and Patent Document 2)
[0006]
JP, 2008-172472, A JP, 2008-258864, A
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[0007]
By the way, the reinforcing member for preventing the vibration of the fixed electrode needs a
certain thickness in order to sufficiently suppress the vibration of the fixed electrode.
And when the above-mentioned push pull type headphone unit is constituted, one fixed pole and
a reinforcement member will certainly be located in the user's ear side.
[0008]
Therefore, in order to sufficiently suppress the vibration of the fixed pole as described above,
when the reinforcing member is formed thick, the reinforcing member approaches the user's ear,
which causes an electric shock due to the audio signal voltage. Risk increases. In order to prevent
such an electric shock, although the distance between the headphone unit and the human ear can
be designed to be far apart, this can be prevented, but a drop in the output sound pressure is
inevitable. .
[0009]
In addition, in this type of condenser headphone, not only an electrically insulating porous plate
is disposed to prevent electric shock, but also a moisture proof film made of an extremely thin
material to prevent deterioration of the insulation due to perspiration of the human body and the
like. Further measures are needed to prevent electric shock due to the audio signal voltage, such
as adding Therefore, it is an important issue to form the reinforcing member used for the
condenser headphone as thin as possible, and to effectively suppress the vibration of the fixed
electrode.
[0010]
On the other hand, both sides of the peripheral part of the above-mentioned diaphragm are fixed
by a pair of spacer rings, and a predetermined tension is applied to the diaphragm. Therefore, the
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displacement of the central portion of the diaphragm vibrates more than that of the peripheral
portion. In addition, when the diaphragm and the fixed electrode are in contact during operation,
a large noise is generated, and further, a current flows between the diaphragm and the fixed
electrode, which causes the problem of damaging the diaphragm.
[0011]
The present invention has been made in consideration of the above-described specific problems
of the condenser headphone unit, and the purpose thereof is to thinly form the above-described
reinforcing member and to ensure the strength thereof, and further to vibrate. It is an object of
the present invention to provide a method of manufacturing a condenser headphone unit and a
fixed pole assembly provided with a fixed pole assembly capable of eliminating the contact to the
fixed pole based on the vibration of the plate.
[0012]
A condenser headphone unit according to the present invention, which has been made to solve
the above-mentioned problems, includes a diaphragm, and fixed electrodes disposed on both
sides of the diaphragm and provided with a plurality of through holes, A condenser headphone
unit in which a polarization voltage is applied to the diaphragm and a signal voltage from an
audio signal source is applied to each of the fixed poles, and the back surface side of each fixed
pole is centered on the diaphragm. The fixed pole assembly in which the fixed pole is formed
with the concave curved surface is formed by being attached to the reinforcing member in which
the concave curved portion is provided, and the concave curved surface of the fixed pole in the
fixed pole assembly is the vibration It is characterized in that it is arranged to face each of the
plates.
[0013]
In this case, the reinforcing member is preferably made of a metal material, and the reinforcing
member is formed with a plurality of openings penetrating in the thickness direction in a region
on the central portion side excluding the outer peripheral edge portion. Configuration is adopted.
More preferably, one of the plurality of openings is disposed at the central portion of the
reinforcing member, and the remaining openings are disposed at the outer periphery of the
central opening. .
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[0014]
On the other hand, in the method of manufacturing the fixed pole assembly used in the
condenser headphone unit according to the present invention, one surface of the reinforcing
member having a uniform thickness and a plurality of openings penetrating in the thickness
direction is formed. The first step of recessing the central portion of the reinforcing member by
applying more stress or polishing while applying stress, and the center of the reinforcing
member in which the central portion is recessed in the first step In the second step of applying
an adhesive to the surface where the portion is recessed and in the second step, a plurality of
through holes are fixed to the surface where the central portion of the reinforcing member to
which the adhesive is applied is recessed. A third step of forming a concave surface on the fixed
electrode is performed by overlapping the poles, applying a load, and sticking the fixed electrode
to the reinforcing member.
[0015]
According to the headphone unit according to the present invention, the back surface side of
each fixed electrode centering on the diaphragm is attached to the reinforcing member to which
the concavely curved portion is applied, whereby the configuration in which the fixed electrode is
formed with the concave surface is adopted. Be done.
Therefore, the concaved portion of the reinforcing member can enhance the mechanical rigidity
of the fixed pole assembly by the diaphragm and the reinforcing member, and while the entire
fixed pole assembly is formed thin, the vibration of the fixed pole can be obtained. You can hold
it effectively.
[0016]
In addition, since the fixed pole assembly can be made thin, the spatial distance between the
fixed pole assembly and the ear of the human body can be secured, and sufficient measures
against electric shock can be taken.
Furthermore, the concave surface formed on the fixed pole can effectively block the contact
between the diaphragm and the fixed pole, which can contribute to providing a highly reliable
condenser headphone.
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[0017]
Further, according to the method of manufacturing the fixed pole assembly described above, the
fixed pole assembly in which the fixed pole attached to the central portion of the reinforcing
member is concaved is formed by forming the concave surface on the fixed pole. As a result, it is
possible to manufacture a fixed pole assembly that provides the same effect as described above.
[0018]
It is a schematic diagram showing the condenser headphone unit concerning the present
invention, and the circuit composition which drives this.
It is a front view of a fixed pole. It is a center sectional view and a front view of a reinforcement
member. It is a schematic diagram explaining the manufacturing process of the fixed pole
assembly by a fixed pole and a reinforcement member. It is a schematic diagram which similarly
demonstrates the other example of a manufacturing process.
[0019]
Hereinafter, a condenser headphone unit according to the present invention will be described
based on the embodiment shown in the drawings. As shown in FIG. 1, the condenser headphone
unit 1 includes a diaphragm 11 and fixed pole assemblies 21F and 21R arranged on both sides of
the diaphragm 11, and one fixed pole assembly 21F is on the ear side of the user And the other
fixed pole assembly 21R is disposed on the back side via the diaphragm 11. The headphone unit
1 is housed in a known headphone housing having an ear pad or the like (not shown). The fixed
pole assemblies 21F and 21R are both configured in the same manner, and when the two are not
particularly distinguished, they are simply indicated by reference numeral 21.
[0020]
The diaphragm 11 is made of, for example, a synthetic resin film such as PET (polyethylene
terephthalate) or PPS (polyphenylene sulfide), and a metal vapor deposition film is formed on the
synthetic resin film. The diaphragm 11 is held between the pair of spacer rings 12 in a state
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where a predetermined tension is applied.
[0021]
The fixed pole assemblies 21F and 21R are constituted by a combination of each of the fixed pole
22 and the reinforcing member 23 shown in FIGS. The fixed electrode 22 shown in FIG. 2 is
formed by punching a metal plate having a thickness of about 0.5 mm into a circular shape with
a diameter of about 100 mm, and occupies most of the center excluding the peripheral portion A
plurality of circular through holes 22a are formed.
[0022]
On the other hand, the reinforcing member 23 shown in FIG. 3 is made of a metal material so as
to have substantially the same diameter as that of the fixed electrode 22 described above.
Further, the reinforcing member 23 is formed with a plurality of openings penetrating in the
thickness direction in a region on the central side excluding the outer peripheral edge. In
addition, a circular opening 23a is formed at the central portion thereof, and a substantially
triangular opening 23b having an arc-shaped base is radially formed outside the circular opening
23a. There is. That is, the reinforcing member 23 is configured in a state where the outer
peripheral edge and the inner peripheral edge are radially connected by the strip-like members.
[0023]
As shown in the cross-sectional view of FIG. 3A, the reinforcing member 23 has the openings 23a
and 23b described above formed in a flat metal plate having a uniform thickness dimension,
which will be described later. As described in the process, the central portion of one surface is
indented to be processed so as to form the indented portion 23c (FIG. 4, FIG. 5). In addition, the
fixed electrode 22 described above is attached and attached, for example, with an adhesive along
the concave curved portion 23c side of the reinforcing member 23 in which the concave curved
portion 23c is formed. Thus, the fixed pole 22 made of a thin metal plate constitutes a fixed pole
assembly 21 in which a concave curved surface 22 b is formed along the concave curved portion
23 c of the reinforcing member 23.
[0024]
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As shown in FIG. 1, the headphone unit 1 is disposed such that the concave surfaces 22b of the
fixed pole 22 face each other on both sides of the diaphragm 11, and both sides via the spacer
rings 12 and 12 holding the diaphragm 11 respectively. Thus, the headphone unit 1 is
configured.
[0025]
Further, as shown in FIG. 1, in order to drive the above-mentioned headphone unit 1, an input
transformer 31 and a DC power supply 32 for generating a polarization voltage are provided.
The primary winding 31 a of the input transformer 31 is connected to an audio signal source 33.
An intermediate tap 31c is drawn out to the secondary winding 31b of the input transformer 31,
and the negative terminal of the DC power supply 32 is connected to the intermediate tap 31c,
and the positive terminal of the DC power supply 32 is the vibration. It is connected to the board
11.
[0026]
Further, one end of the secondary winding 31b of the input transformer 31 is connected to the
fixed pole 22 of the one fixed pole assembly 21F, and the other end of the secondary winding
31b is the other fixed It is connected to the fixed pole 22 of the pole assembly 21R.
[0027]
The DC power supply 32 applies a polarization voltage of, for example, about 500 V to the
diaphragm 11.
Further, the signal voltage applied from the audio signal source 33 to the primary side winding
31a of the input transformer 31 is such that one side is in positive phase and the other is in
reverse phase by the secondary side winding 31b. They are respectively added to the assemblies
21F and 21R.
[0028]
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With this configuration, the diaphragm 11 is driven by the push-pull action by the fixed pole
assemblies 21F and 21R on both sides, vibrates based on the audio signal from the audio signal
source 33, and reproduces the audio wave. Then, the sound wave reproduced by the diaphragm
11 is supplied to the user's ear through the plurality of through holes 22a provided to the fixed
pole 22 in the fixed pole assembly 21F on the front side.
[0029]
FIG. 4 illustrates a first method of manufacturing the fixed pole assembly 21 by the fixed pole 22
and the reinforcing member 23 described above. The reinforcing member 23 shown in FIG. 4 (A)
is made of a metal material having a uniform thickness, as described with reference to FIG. 3, and
a plurality of openings are formed in the thickness direction. . As shown in FIG. 4 (B), the
reinforcing member 23 applies stress from one surface of the reinforcing member 23 using, for
example, a press die 25 whose central portion protrudes in a curved surface shape, the
reinforcing member A process of recessing the central portion of 25 is performed (first step). In
this case, although not shown in the figure, the pressing efficiency with a concave surface may be
increased below the reinforcing member 23 shown in FIG. it can.
[0030]
FIG. 4C shows a state (second step) in which the adhesive 26 is applied to the surface in which
the central portion is recessed with respect to the reinforcing member 23 in which the concave
curved portion 23c is formed by recessing the central portion. There is. Subsequently, as shown
in FIG. 4D, the fixed pole 22 provided with a plurality of through holes 22a is superimposed on
the concave curved portion 23c of the reinforcing member 23 to which the adhesive 26 is
applied. A load is applied from the top surface of the fixed pole 22 as indicated by the open
arrow. Thereby, the fixed electrode 22 is attached to the reinforcing member 23 (third step).
[0031]
As a result, as shown in FIG. 4E, in the fixed pole 22 formed of a thin metal material, a concave
surface 22b is formed along the concave curved portion 23c formed on the reinforcing member
23, and the fixed pole is formed. An assembly 21 is obtained.
[0032]
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FIG. 5 illustrates a second method of manufacturing the fixed pole assembly 21 by the fixed pole
22 and the reinforcing member 23 described above.
In the second manufacturing method, a reinforcing member 23 slightly thicker than the
reinforcing member 23 used in the first manufacturing method described above is used, and a
plurality of openings are formed in the thickness direction. The same is true for
[0033]
In this second manufacturing method, as shown in FIG. 5B, a polishing jig 27 whose central
portion protrudes in a curved surface shape is used, and this polishing jig 27 is axially rotated as
shown by an arrow. Is configured as. Then, the polishing jig 27 rotates while applying stress to
one surface of the reinforcing member 23 to polish one surface of the reinforcing member 23. As
a result, as shown in FIG. 5C, the concaved portion 23c is formed on one surface of the
reinforcing member 23 (first step).
[0034]
The second step of applying the adhesive to the surface in which the central portion of the
reinforcing member 23 is recessed and the load on the fixed electrode 22 are superimposed on
the surface in which the central portion of the reinforcing member 23 is recessed. About the 3rd
process of sticking 22 to the reinforcement member 23, it is shown by FIG.5 (C)-(E). This is
similar to the steps already described in FIGS. 4 (C) to 4 (E), and therefore the description thereof
is omitted.
[0035]
The fixed pole assembly 21 obtained by the above-described manufacturing method is disposed
as shown in FIG. 1 so that the concave surfaces 22 b of the fixed pole 22 face each other on both
sides of the diaphragm 11. 1 is formed.
[0036]
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Therefore, according to the condenser headphone unit of the present invention, the vibration of
the fixed pole can be effectively suppressed while forming the whole fixed pole assembly thin.
In addition, since the fixed pole assembly can be made thin, the spatial distance between the
fixed pole assembly and the human ear can be secured, and sufficient measures against electric
shock can be taken. It is possible to obtain the effects as described in the column.
[0037]
DESCRIPTION OF SYMBOLS 1 headphone unit 11 diaphragm 12 spacer ring 21F, 21R fixed pole
assembly 22 fixed pole 22a through hole 22b concave surface 23 reinforcing member 23a, 23b
opening 23c concave curved portion 25 press mold 26 adhesive 27 polishing jig 31 input
Transformer 31a Primary winding 31b Secondary winding 31c Intermediate tap 32 DC power
supply 33 Audio signal source
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