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JP2016131350

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2016131350
Abstract: To provide a condenser microphone capable of assuring electrical connection between
an audio signal output circuit board and a rear case. A microphone unit (10), an audio signal
output circuit board (20) connected to the microphone unit, and a rear case (30) provided with a
cutout groove (31a) into which the audio signal output circuit board is inserted A mounting
groove 31b to which the mounting member 50 is mounted is formed on the surface of the case,
and a fitting groove 21 to which the mounting member is mounted is formed on the audio signal
output circuit board. [Selected figure] Figure 1
Condenser Microphone and Method of Manufacturing Condenser Microphone
[0001]
The present invention relates to a condenser microphone and a method of manufacturing the
condenser microphone.
[0002]
Among the condenser microphones, for example, a microphone unit (hereinafter referred to as a
“unit”) in order to reduce the shape as a unidirectional directivity condenser microphone used
for a meeting or the like.
An audio signal output circuit board (PCB: Printed Circuit Board) is attached to the rear of the.
The housing of the microphone comprises three parts. The three parts consist of a cap that
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covers the front of the unit (direction toward the sound source), a cylindrical microphone case
that houses the unit and the PCB, and the back of the PCB (the opposite direction to the direction
facing the sound source) It is a surrounding rear case. A microphone cable is passed through the
rear case for extracting an audio signal output from the microphone. In the case of a gooseneck
microphone, a flexible pipe is connected to the rear case.
[0003]
In order to form an electrostatic shield, the microphone outer casing is made of metal parts and
combined. When the electrical connection of the coupling portion is uncertain, when a strong
electromagnetic wave is applied to the coupling portion, a high frequency current is generated
and enters the inside of the microphone. As a result, the unit detects high frequency current and
outputs it as noise. In particular, when the electrical connection between the microphone case
and the rear case and the electrical connection between the PCB and the rear case are uncertain,
a large amount of noise is output.
[0004]
Here, the microphone case and the rear case are screwed and coupled with a plurality of (for
example, three) screws from the outside of the microphone case. However, the contact portion of
the rear case in contact with the inner diameter portion of the microphone case is limited to the
microphone case portion which is tightened and deformed by a screw. For this reason, as the
number of screws increases, the electrical connection becomes more reliable but the appearance
of the contact portion of the rear case becomes inferior.
[0005]
On the other hand, a method has been used in which a plate-like metal spring or the like attached
to the PCB is brought into contact with the PCB and the rear case. This is because, since the
microphone case is a small microphone having an outer diameter of about 12 mm, it is difficult
to take a structure in which the rear case is machined and mechanically fixed to the PCB.
[0006]
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FIG. 12 is an exploded perspective view of a conventional condenser microphone. The condenser
microphone comprises a cap 2, a microphone case 3, a unit 10, a PCB 200 and a rear case 300.
FIG. 13 is an exploded side sectional view of the condenser microphone shown in FIG.
[0007]
The microphone case 3 has a hollow cylindrical shape made of metal. A cap 2 is fixed to one end
(front side) of the microphone case 3 so as to cover the opening of the microphone case 3. A
screw hole 3 h into which a screw 40 is inserted is formed on the surface of the rear of the
microphone case 3.
[0008]
Unit 10 is a circle that converts a change in capacitance generated between a metal unit case
having an opening, a diaphragm and a fixed pole that constitute a capacitor, and a diaphragm
and a fixed pole into an electric signal and outputs the electric signal. And a plate-like circuit
board. The unit case accommodates the capacitor and the circuit board. A sound wave
introducing hole through which a sound wave from a sound source passes is formed on the
bottom surface of the unit case (the opposite surface of the opening). The circuit board is
disposed so as to cover the opening of the unit case, and is fixed to the unit case by curling
(caulking) of the rear end edge of the unit case.
[0009]
The PCB 200 has a plate-like shape, and a notch 222 is formed on the side of connection with
the unit 10.
[0010]
The rear case 300 is made of metal and has a large diameter portion 331, a medium diameter
portion 332, a small diameter portion 333, and a flange 334.
The large diameter portion 331 is formed with a notch groove 331a into which the rear portion
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of the PCB 200 is inserted, and a screw hole 331h communicating with the screw hole 3h.
[0011]
FIG. 14 is a side sectional view of the condenser microphone shown in FIG. The rear end of the
microphone case 3 is in contact with the flange 334 of the rear case 300, and the microphone
case 3 and the rear case 300 are coupled. The rear portion of the PCB 200 is inserted into the
cutout groove 331 a of the rear case 300, and the unit 10 and the PCB 200 are accommodated in
the microphone case 3.
[0012]
The leaf spring 400 is made of metal and electrically connects the PCB 200 and the rear case
300. For example, one end of the leaf spring 400 is attached to the rear case 300, and the other
end of the leaf spring 400 is inserted between the PCB 200 and the cutout groove 331a when
the rear portion of the PCB 200 is inserted into the cutout groove 331a. And fixed to the PCB
200 and the rear case 300.
[0013]
FIG. 15 is a plan sectional view of the condenser microphone shown in FIG. The microphone case
3 is electrically connected to the rear case 300 via a screw 40.
[0014]
In addition, using a metal leaf spring as a method of securing electrical connection has been
proposed so far (see, for example, Patent Document 1).
[0015]
Patent No. 4417801 specification
[0016]
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However, when the electrical connection between the microphone case 3 and the rear case 300
is in an uncertain state only by screwing with the screw 40, the leaf spring 400 also has an
impedance in high frequency, so connection of the PCB 200 and the rear case 300 to the ground
Will also be uncertain.
Therefore, it is desirable that the PCB 200 and the rear case 300 be mechanically coupled to
ensure electrical connection between the PCB 200 and the rear case 300.
[0017]
The present invention has been made to solve the problems of the prior art as described above,
and provides an electrical connection between a microphone case and a back case, in particular,
an electrical connection between an audio signal output circuit board and the back case. It is an
object of the present invention to provide a capacitor microphone and a manufacturing method
of the capacitor microphone which can be surely realized.
[0018]
The present invention comprises a microphone unit, an audio signal output circuit board
connected to the microphone unit, and a rear case provided with a cutout groove into which the
audio signal output circuit board is inserted, and the surface of the rear case is provided. A
mounting groove to which the mounting member is mounted is formed, and a fitting groove to
which the mounting member is mounted is formed in the audio signal output circuit board.
[0019]
According to the present invention, the electrical connection between the audio signal output
circuit board and the rear case can be surely realized.
[0020]
It is an exploded perspective view of a condenser microphone concerning the present invention.
It is a disassembled plane sectional view of the above-mentioned condenser microphone.
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It is an exploded perspective view of the back of a sound signal output circuit board which
constitutes the above-mentioned condenser microphone, and a back case.
FIG. 5 is an exploded plan sectional view of the rear portion of the audio signal output circuit
board and the rear case.
FIG. 6 is an exploded plan cross-sectional view of the rear case on which the rear portion of the
audio signal output circuit board and the C-shaped ring are mounted. It is plane sectional
drawing of the rear of the said audio | voice signal output circuit board, and the said rear case. It
is a plane sectional view of the above-mentioned condenser microphone. It is a plane sectional
view of the back of the microphone case which constitutes the above-mentioned condenser
microphone, the back of the above-mentioned sound signal output circuit board, and the abovementioned back case. It is a side sectional view of the above-mentioned condenser microphone. It
is an outline view showing an embodiment of the above-mentioned condenser microphone. It is
the components exploded view of the above-mentioned condenser microphone. It is a
disassembled perspective view of the conventional condenser microphone. FIG. 13 is an exploded
side cross-sectional view of the conventional condenser microphone shown in FIG. FIG. 13 is a
side sectional view of the conventional condenser microphone shown in FIG. FIG. 13 is a plan
cross-sectional view of the conventional condenser microphone shown in FIG.
[0021]
Hereinafter, an embodiment of a condenser microphone and a method of manufacturing the
condenser microphone according to the present invention will be described with reference to the
drawings.
[0022]
Main Part of Condenser Microphone FIG. 1 is an exploded perspective view of a condenser
microphone according to the present invention, and shows a cap 2, a microphone case 3 and a
microphone unit (hereinafter referred to as "unit") constituting the main part of the condenser
microphone.
) And an audio signal output circuit board (hereinafter referred to as "PCB"). ) 20 and the rear
case 30 are shown. FIG. 2 is an exploded plan sectional view of the condenser microphone.
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[0023]
1 and 2 show a state in which the cap 2 is attached to the microphone case 3 and the unit 10 is
attached to the PCB 20. Moreover, in the same figure, illustration of the microphone cable of the
back | latter stage of rear case 30 and a connector is abbreviate | omitted.
[0024]
In the following description, the direction of the sound source to which the condenser
microphone is directed at the time of sound collection is taken as the front of the condenser
microphone.
[0025]
The cap 2 is in the form of a thin plate donut disc made of metal.
A sound wave introduction hole through which a sound wave from a sound source passes is
formed substantially in the center of the cap 2 in plan view.
[0026]
The microphone case 3 has a hollow cylindrical shape made of metal. An annular recess 3 c is
formed at the rear of the surface of the microphone case 3 (the side opposite to the side on
which the cap 2 is attached and the side on which the rear case 30 is attached). The recess 3 c
reduces the volume of the space in the microphone case 3. As a result, the impedance of the
acoustic capacitance of the space in the microphone case 3 becomes high, and the resonance
frequency of this space becomes high, so that the deterioration of the directional frequency
response in the frequency band below the resonance frequency is suppressed. On the rear end
side of the microphone case 3, a screw hole 3h of a metal screw 40 is formed.
[0027]
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Unit 10 includes a metal bottomed cylindrical unit case having an opening, a diaphragm and a
fixed electrode constituting a capacitor disposed in the unit case, and an electrostatic capacitance
generated between the diaphragm and the fixed electrode. And a disk-shaped circuit board for
converting the change of the voltage into an electric signal and outputting the electric signal. A
sound wave introduction hole through which a sound wave from the sound source passes is
provided on the bottom surface of the unit case (the opposite surface of the opening facing the
sound source side at the time of sound collection). The circuit board is disposed so as to cover
the opening of the unit case, and is fixed to the unit case by curling (caulking) of the rear end
edge of the unit case.
[0028]
The PCB 20 has a plate shape, and the fitting groove 21 is formed on the rear end side (the rear
case 30 side), and the notch 22 is formed on the other end side (the unit 10 side).
[0029]
The fitting groove 21 is formed on each of the outer edges of the two opposing sides in the
direction along the surface of the PCB 20.
The fitting groove 21 communicates with a mounting groove 31 b formed in the rear case 30
described later in a state where the rear end side of the PCB 20 is inserted into the rear case 30.
[0030]
The notch 22 is a passage in the microphone case 3 of a sound wave entering the microphone
case 3 from a sound wave introduction hole (not shown) formed on the side surface of the
microphone case 3 and reduces the acoustic impedance of the sound wave introduction hole. As
a result, the deterioration of the directional frequency response due to the resonance between
the acoustic mass of the space in the microphone case 3 in which the PCB 20 is disposed and the
opening formed on the side surface of the microphone case 3 is suppressed.
[0031]
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The PCB 20 is electrically connected to a circuit board constituting the unit 10, and outputs an
electrical signal (audio signal) output from the circuit board of the unit 10 to a connector (not
shown). The connector is, for example, the first pin for grounding specified in EIAJ RC-5236
“Latch lock type round connector for audio equipment”, the second pin on the hot (HOT) side
of the signal, and the third on the cold (COLD) side. It is an output connector having a pin. The
PCB 20 and the connector are electrically connected via a microphone cable (not shown). The
microphone cable is, for example, a two-core shield-covered wire having two types of signal lines,
a hot side and a cold side, and a shield-covered wire.
[0032]
The unit 10 and the PCB 20 are disposed inside the microphone unit 3 such that the sound
introducing hole of the unit 10 communicates with the sound introducing hole of the cap 2.
[0033]
The rear case 30 is made of metal and provided with a large diameter portion 31, a medium
diameter portion 32 and a small diameter portion 33.
The medium diameter portion 32 is provided between the large diameter portion 31 and the
small diameter portion 33. Each of the large diameter portion 31, the middle diameter portion
32, and the small diameter portion 33 is a hollow, substantially cylindrical shape, and the
respective hollows communicate with each other. At the boundary between the large diameter
portion 31 and the medium diameter portion 32 on the outer periphery of the rear case 30, a
flange 34 having a diameter larger than that of the large diameter portion 31 is annularly
provided.
[0034]
FIG. 3 is an exploded perspective view of the rear of the PCB 20 and the rear case 30. As shown
in FIG. The large diameter portion 31 is formed with a notch groove 31a, a mounting groove 31b,
and a screw hole 31h.
[0035]
The notch groove 31a is a groove into which the rear end of the PCB 20 is inserted, and is
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formed in the longitudinal direction of the rear case 30 from the large diameter portion 31 side
toward the small diameter portion 33 side.
[0036]
The mounting groove 31 b is a groove to which a C-shaped ring 50 as a mounting member made
of an elastic material is mounted, and is formed annularly on the outer periphery of the large
diameter portion 31.
The mounting groove 31b is in communication with the notch groove 31a. By setting the
diameter of the mounting groove 31b smaller than the diameter of the C-shaped ring 50, the Cshaped ring 50 and the mounting groove 31b (that is, the rear case 30) when the C-shaped ring
50 is mounted in the mounting groove 31b. The connection is secure.
[0037]
The screw hole 31 h communicates with the screw hole 3 h of the microphone case 3 in a state
where the large diameter portion 31 of the rear case 30 is accommodated in the microphone
case 3.
[0038]
Method of Manufacturing Condenser Microphone Hereinafter, a method of manufacturing
(manufacturing method) of the microphone case 3 to which the cap 2 is attached, the PCB 20
electrically connected to the unit 10, and the rear case 30 will be described.
[0039]
FIG. 4 is an exploded plan sectional view of the rear of the PCB 20 and the rear case 30.
Ground lands 23 are provided at positions adjacent to the fitting grooves 21 of the PCB 20,
respectively.
[0040]
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First, the C-shaped ring 50 is mounted in the mounting groove 31b.
[0041]
FIG. 5 is an exploded plan sectional view of the rear case 30 on which the rear of the PCB 20 and
the C-shaped ring 50 are mounted.
A portion of the surface of the C-shaped ring 50 mounted in the mounting groove 31 b is
exposed to the outside of the outer peripheral surface of the large diameter portion 31.
[0042]
Next, the PCB 20 is inserted from the rear side where the fitting groove 21 is formed into the
cutout groove 31a of the rear case 30 to which the C-shaped ring 50 is mounted, and the Cshaped ring 50 is mounted in the fitting groove 21 Fitted).
Here, the C-shaped ring 50 is mounted in the fitting groove 21 at a portion located at a
communication location between the notch groove 31 a and the mounting groove 31 b.
[0043]
FIG. 6 is a plan sectional view of the rear of the PCB 20 and the rear case 30 showing a mode in
which the rear of the PCB 20 is inserted into the cutout groove 31a of the rear case 30 to which
the C-shaped ring 50 is attached. The width (vertical length in the drawing) of the PCB 20 is
larger than the inner diameter of the rear case 30 and smaller than the outer diameter of the rear
case 30. The PCB 20 is electrically connected to the rear case 30 through the C-shaped ring 50
mounted in the fitting groove 21, so that the electrical connection between the PCB 20 and the
rear case 30 is surely realized.
[0044]
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Next, the microphone case 3 has a PCB 20 on which the C-shaped ring 50 is mounted in the
fitting groove 21 and a front portion (a portion on the large diameter portion 31 side) of the rear
case 30 with the rear portion of the PCB 20 inserted. Accommodate. The screw hole 3 h of the
microphone case 3 accommodating the front portion of the PCB 20 and the rear case 30
communicates with the screw hole 31 h of the rear case 30. A screw 40 as a locking member is
inserted from the screw hole 3h, and the microphone case 3 and the rear case 30 are screwed
and fixed.
[0045]
FIG. 7 is a plan sectional view of the condenser microphone. FIG. 8 is a plan sectional view of the
rear of the microphone case 3, the rear of the PCB 20, and the rear case 30, and FIG. 9 is a side
sectional view of the condenser microphone.
[0046]
7 and 8 show that the microphone case 3 is electrically connected to the PCB 20 over
substantially the entire inner peripheral surface of the microphone case 3 via the C-shaped ring
50, and the microphone case 3 is connected via the screw 40. It is shown that the rear case 30 is
electrically connected. 7-9, the rear end of the microphone case 3 is in contact with the flange 34
of the rear case 30, so that the screw holes (3h, 31h) of the microphone case 3 and the rear case
30 communicate with each other. It indicates that it is positioned.
[0047]
In the manufacturing method described above, the step of mounting the C-shaped ring 50 in the
mounting groove 31b is performed before the step of inserting the rear portion of the PCB 20
into the cutout groove 31a. However, in the method of manufacturing a condenser microphone
according to the present invention, the step of mounting the C-shaped ring 50 in the mounting
groove 31b is performed before the step of inserting the rear portion of the PCB 20 into the
cutout groove 31a. It is also good.
[0048]
Overall of Condenser Microphone FIG. 10 is an external view showing an embodiment of a
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condenser microphone according to the present invention, and FIG. 11 is an exploded view of
parts of the condenser microphone shown in FIG.
[0049]
The condenser microphone 1 is, for example, a goose neck type, and has a cap 2, a microphone
case 3, a rear case 30, a goose neck pipe 4A, a pipe 5, a joint 6, a goose neck pipe 4B, and a
connector case 7. Become.
[0050]
In the following description, although the goose neck microphone is described as an example, the
condenser microphone according to the present invention is applicable not only to the goose
neck microphone, but, for example, a microphone unit such as a lavelia microphone or a wireless
microphone The present invention is applicable to microphones that are required to be
miniaturized.
[0051]
The microphone case 3 accommodates the unit 10 and the PCB 20 as described above.
At the time of sound collection, the cap 2 is put on one end side (the lower side of the paper
surface) of the microphone case 3 directed to the sound source side, and the gooseneck pipe 4A
is disposed on the other end side (the upper surface of the paper surface) Combined.
The goose neck pipe 4A is coupled to one end side of a pipe 5 made of a metal straight pipe.
One end side of the goose neck pipe 4B is coupled to the other end side of the pipe 5 via the joint
6. A connector case 7 incorporating a connector 8 is coupled to the other end of the goose neck
pipe 4B.
[0052]
The connector 8 is, for example, an output connector having a first pin for grounding specified in
EIAJ RC-5236 “Latch-lock type round connector for audio equipment” and a second pin on the
hot side of the signal and a third pin on the cold side. It is.
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[0053]
The PCB 20 incorporates a balanced transmission circuit.
The PCB 20 and the connector 8 are electrically connected via the microphone cable 9. The
microphone cable 9 is a two-core shield-covered wire having two types of signal lines and shieldcovered wires on the hot (HOT) side and the cold (COLD) side, which are inserted into the goose
neck pipes 4A and 4B and the pipe 5. .
[0054]
The shielded cable of the microphone cable 9 is connected to the ground (ground circuit) of the
PCB 20 via the ground land 23 of the PCB 20, for example. The ground of the PCB 20 is
connected to the first pin of the connector 8, and the first pin is also connected to a shield
housing (not shown). In the connector 8 and the microphone cable 9, the signal line on the hot
side of the microphone cable 9 is connected to the second pin of the connector 8, and the signal
line on the cold side of the microphone cable 9 is connected to the third pin on the connector 8. ,
Shield covering wire is connected to the first pin of the connector 8.
[0055]
The unit 10 incorporates a field effect transistor (FET) that constitutes an impedance converter.
The FET comprises a gate electrode, a drain electrode and a source electrode. Two types of signal
lines of the microphone cable 9 are connected to the source electrode through the PCB 20. The
audio signal output from the FET is an unbalanced signal. The audio signal output from the FET
as an unbalanced signal is converted to a balanced signal by the PCB 20 and output to the
microphone cable 9.
[0056]
According to the embodiment described above, the PCB 20 is electrically connected to the rear
case 30 to electrically connect with the rear case 30 via the C-shaped ring 50 mounted in the
mounting groove 31b. Connection can be realized reliably.
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[0057]
Further, since the microphone case 3 is electrically connected to the PCB 20 via the C-shaped
ring 50, the electrical connection between the microphone case 3 and the rear case 30 is surely
realized via the C-shaped ring 50 and the PCB 20. be able to.
[0058]
DESCRIPTION OF SYMBOLS 1 capacitor microphone 2 cap 3 microphone case 3c recessed part 3
h screw hole 4 goose neck pipe 5 pipe 6 joint 7 connector case 8 connector 9 microphone cable
10 microphone unit (unit) 20 audio signal output circuit board (PCB) 21 fitting groove 22 notch
23 Ground land 30 Rear case 31 Large diameter part 31a Notch groove 31b Mounting groove
31h Screw hole 32 Medium diameter part 33 Small diameter part 34 Flange 40 Screw (locking
member) 50 C type ring (mounting member)
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