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JP2016149585

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DESCRIPTION JP2016149585
Abstract: To prevent destruction of a signal processing unit in a circuit case that processes
signals output from a microphone unit housed in the unit case and generation of noise even
when the unit case and the circuit case are separated. To obtain a microphone device that can A
circuit case in which a unit case 3 in which a microphone unit 31 is accommodated, an input
terminal to which a signal from the microphone unit is input, and a signal processing unit that
processes a signal input to the input terminal are accommodated. 4 is a detachable microphone
device 1, and includes detection units (38, 44) for detecting the attachment / detachment state of
the unit case and the circuit case, and the detection unit is a disengagement state of the unit case
and the circuit case And the input terminal is grounded. [Selected figure] Figure 5
Microphone device
[0001]
The present invention relates to a microphone device in which a microphone unit is replaceable.
[0002]
For example, as a condenser microphone, there is a condenser microphone called a stick type in
which microphone units having different directivity can be exchanged (see, for example, Patent
Documents 1 and 2).
Such a microphone device is selected from among microphone units such as cardioid,
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hypercardioid, omnidirectional, bidirectional, etc., according to the application of sound
collection, in the microphone body incorporating the power module. It is worn and used.
[0003]
The microphone device capable of replacing the microphone unit includes a unit case for housing
the microphone unit, a circuit case for housing a signal processing unit for processing an audio
signal output from the microphone unit, a cap for covering the opening of the unit case, and
signal processing And a rear case in which a connector for outputting a signal generated by the
unit to an external device is accommodated.
[0004]
FIG. 7 is a longitudinal cross-sectional view of a storage of a unit case constituting a conventional
microphone device.
The figure shows the cap 2 fixed to the unit case 3. Here, the case where a unidirectional
microphone unit is used will be described as an example.
[0005]
The microphone unit 31 is accommodated on the front side in the unit case 3. The inner side
plate 34 is fitted and fixed to the rear side in the unit case 3. An outer side plate 35 is fitted and
fixed to the rear of the inner side plate 34 in the unit case 3. In a hole formed at the center of the
outer side plate 35, a first terminal 37 of a conductive material with a bridle is inserted from the
inside (front side) to the outside (rear side) of the unit case 3. In the hole formed at the center of
the inner side plate 34, a rod-like terminal 33 is inserted from the outside toward the inside. The
terminal 33 is fixed to the inner plate 34 in a form projecting toward the microphone unit 31. In
the central hole of the inner and outer plates 34 and 35, a spring 36 made of a conductor is
interposed. The first terminal 37 is pushed outward of the outer side plate 35 by the repulsive
force of the spring 36, and the rear end of the first terminal 37 formed in a hemispherical shape
protrudes outward of the outer side plate 35 to form the unit case 3 Housed in The output
terminal plate 32 extended from the microphone unit 31 is screwed to the front end of the
terminal 33.
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[0006]
FIG. 8 is a longitudinal cross-sectional view of a storage case of a circuit case constituting the
conventional microphone device and a storage case of a rear case attached to the circuit case. A
front end plate 41 is fitted and fixed to the inner circumference of the tip of the circuit case 4
adjacent to the female screw 4S and to the rear of the female screw 4S. The second terminal 42
of the conductive material penetrates the center of the front end plate 41 in the thickness
direction (vertical direction in the drawing) and is fitted and fixed to the front end plate 41.
[0007]
A circuit board 43 is mounted in the circuit case 4 along the length direction. The circuit board
43 constitutes a signal processing unit that processes a signal from the microphone unit 31. The
second terminal 42 is connected to the input terminal of the circuit board 43 via a suitable
conductive material.
[0008]
The rear case 5 is fitted into the rear end of the circuit case 4, and the circuit case 4 and the rear
case 5 are fixed by screws 6. The rear end of the circuit board 43 is inserted into the notch
groove 51 formed in the inside of the rear case 5, and the circuit board 43 and the rear case 5
are electrically connected.
[0009]
An insulating connector base 52 is fitted in the rear case 5 and fixed by screws or the like. The
connector base 52 is embedded with a connector composed of three conductive standardized
pins. The first pin 53 is connected to the ground terminal of the circuit board 43. The second pin
54 is connected to the output terminal on the hot side of the output circuit of the circuit board
43. The third pin 55 is connected to the output terminal on the cold side of the output circuit of
the circuit board 43.
[0010]
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A connector plug (not shown) is inserted into the rear case 5. The audio signal output from the
microphone unit 31 is output to an external device via the 2nd pin 54 and the 3rd pin 55, and
the microphone cord connected to the connector plug.
[0011]
FIG. 9 is a longitudinal sectional view of a conventional microphone device. When the male screw
3S of the unit case 3 is screwed into the female screw 4S of the circuit case 4, the unit case 3 and
the circuit case 4 are coupled (mounted) while the spring 36 is compressed. In a state where the
unit case 3 and the circuit case 4 are mounted, the first terminal 37 of the unit case 3 is pressed
against the second terminal 42 of the circuit case 4 by the compression force of the spring 36 to
be electrically connected. .
[0012]
The audio signal output from the microphone unit 31 is input to the input terminal of the circuit
board 43 via the output terminal plate 32, the terminal 33, the spring 36, the first terminal 37,
and the second terminal 42. The circuit board 43 performs predetermined processing such as
impedance conversion, low cut, and amplification of an audio signal input from the microphone
unit 31 to generate an output signal. An output signal generated by the circuit board 43 is
transmitted to the first pin 53, the second pin 54, and the third pin 55.
[0013]
Here, since the impedance of the signal source of the capacitor microphone is electrostatic
capacitance (about several pF to several 10 pF), it is necessary to use a field effect transistor
(FET) that constitutes an impedance converter. The FET comprises a gate electrode, a drain
electrode and a source electrode. The signal from the microphone unit is input to the gate
electrode. When a high voltage current flows into the gate electrode, the FET breaks down. As a
method of preventing such a failure of the FET, there is a method of connecting a protective
diode or the like to an input portion of a signal from the microphone unit.
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[0014]
Patent No. 4533784 Specification of patent specification specification No. 4638996 specification
[0015]
However, in the method of preventing the failure of the FET by connecting a protective diode or
the like as described above, the stray capacitance of the input signal increases due to the
electrostatic capacitance of the diode, and the sensitivity of the microphone device is lowered.
[0016]
When the unit case 3 is attached to the circuit case 4, an electrostatic shield is configured, so that
a high voltage is not applied to the gate electrode.
However, when the unit case 3 is removed from the circuit case 4 in order to replace the
microphone unit, and the charged human body touches the connection part with the unit case 3
housed in the circuit case 4, for example, the second terminal 42 The charge of the human body
flows into the gate electrode through the connection part, and the FET is destroyed.
[0017]
Also, when the unit case 3 is removed from the circuit case 4 while the stored items in the circuit
case 4 are electrically operated, the contact between the unit case 3 and the circuit case 4 is
released, so a large noise is generated. Occur.
[0018]
Thus, when the unit case 3 is removed from the circuit case 4, the connection parts and the gate
electrode are electrically separated, or when the connection parts are grounded, the destruction
of the FET and the generation of noise are prevented. can do.
[0019]
The present invention has been made to solve the problems of the prior art as described above,
and the signal output from the microphone unit housed in the unit case is output even when the
unit case and the circuit case are separated. An object of the present invention is to provide a
microphone device capable of preventing the destruction of a signal processing unit in a circuit
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case to be processed and the generation of noise.
[0020]
The present invention includes a unit case in which a microphone unit is accommodated, an
input terminal to which a signal from the microphone unit is input, and a circuit case in which a
signal processing unit that processes a signal input to the input terminal is accommodated. Is a
detachable microphone device, and includes a detection unit that detects an attachment /
detachment state of the unit case and the circuit case, and the detection unit grounds the input
terminal when the detachment state of the unit case and the circuit case is detected. It is
characterized by
[0021]
According to the present invention, it is possible to prevent the destruction of the stored contents
of the circuit case and the generation of noise.
[0022]
FIG. 1 is an external view showing an embodiment of a microphone device according to the
present invention.
It is an external view of the above-mentioned microphone device from which the unit case and
circuit case which constitute the above-mentioned microphone device parted.
It is a longitudinal cross-sectional view of the said unit case and its storage thing.
It is a longitudinal cross-sectional view of the storage thing of the said circuit case, and the
storage thing of the rear case attached to the said circuit case.
It is a longitudinal cross-sectional view of the said microphone apparatus.
It is a connection block diagram of the switch accommodated in the said circuit case.
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It is a longitudinal cross-sectional view of the storage thing of the unit case of the conventional
microphone apparatus. It is a longitudinal cross-sectional view of the storage thing of the circuit
case of the conventional microphone apparatus, and the storage thing of the rear case attached
to the said circuit case. It is a longitudinal cross-sectional view of the conventional microphone
apparatus.
[0023]
Hereinafter, an embodiment of a microphone device according to the present invention will be
described with reference to the drawings.
[0024]
FIG. 1 is an external view showing an embodiment of a microphone device according to the
present invention.
The microphone device 1 includes a cap 2, a unit case 3, a circuit case 4 and a rear case 5.
[0025]
In the microphone device according to the present invention, the microphone unit is replaceable,
and in the following description, a case where a unidirectional microphone unit is mounted is
described as an example.
[0026]
The cap 2 has a cylindrical shape with a bottom and made of metal, and a sound hole 2h as a
front acoustic terminal is formed on the front side (direction of the microphone device 1 directed
to the sound source side at the time of sound collection).
The cap 2 is covered and fixed so as to cover the opening on the front side of the cylindrical unit
case 3.
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[0027]
The unit case 3 has a cylindrical shape made of metal, and a sound hole 3h as a rear acoustic
terminal is formed on the side surface.
[0028]
The circuit case 4 is a metal cylindrical cylinder, the unit case is attached to the front side, and
the rear case 5 is attached to the rear side.
The circuit case 4 serves as a grip of the microphone device 1. The screw 6 is a locking member
that fixes the circuit case 4 and the rear case 5.
[0029]
The rear case 5 is made of metal and includes a large diameter portion and a small diameter
portion. The large diameter portion and the small diameter portion are hollow and substantially
cylindrical and the hollows communicate with each other.
[0030]
FIG. 2 is an external view of the microphone device 1 in a state in which the unit case 3 and the
circuit case 4 are separated. At the rear end of the unit case 3, an external thread 3S is formed. A
female screw 4S is formed on the inner peripheral surface of the front end of the circuit case 4.
The unit case 3 and the circuit case 4 are coupled together by screwing the male screw 3S and
the female screw 4S.
[0031]
FIG. 3 is a vertical cross-sectional view of the unit case 3 and its storage. The figure shows a state
where the cap 2 is fixed to the unit case. The microphone unit 31 is accommodated on the front
side in the unit case 3. The microphone unit 31 converts, into an electrical signal, a change in
electrostatic capacitance generated between the diaphragm and the fixed electrode constituting
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the capacitor and the diaphragm and the fixed electrode in a metal bottomed cylindrical unit
case. A disc-shaped circuit board for output is disposed. The capacitance of this capacitor is
changed by the vibration of the diaphragm by the sound wave from the sound hole 2h.
[0032]
The inner side plate 34 is fitted and fixed to the rear side in the unit case 3. An outer side plate
35 is fitted and fixed to the rear of the inner side plate 34 in the unit case 3. In a hole formed at
the center of the outer side plate 35, a first terminal 37 of a conductive material with a bridle is
inserted from the inside (front side) to the outside (rear side) of the unit case 3. In the hole
formed at the center of the inner side plate 34, a rod-like terminal 33 is inserted from the outside
toward the inside. The terminal 33 is fixed to the inner plate 34 in a form projecting toward the
microphone unit 31. In the central hole of the inner and outer plates 34 and 35, a spring 36
made of a conductor is interposed. The first terminal 37 is pushed outward of the outer side plate
35 by the repulsive force of the spring 36, and the rear end of the first terminal 37 formed in a
hemispherical shape protrudes outward of the outer side plate 35 to form the unit case 3 Housed
in The output terminal plate 32 extended from the microphone unit 31 is screwed to the front
end of the terminal 33.
[0033]
A ring-shaped magnet (magnet) 38 is embedded in the outer side plate 35. The application of the
magnet 38 will be described later.
[0034]
FIG. 4 is a longitudinal cross-sectional view of the stored matter of the circuit case 4 and the
stored matter of the rear case 5. A front end plate 41 is fitted and fixed to the inner
circumference of the tip of the circuit case 4 adjacent to the female screw 4S and to the rear of
the female screw 4S. The second terminal 42 of the conductive material penetrates the center of
the front end plate 41 in the thickness direction (vertical direction in the drawing) and is fitted
and fixed to the front end plate 41.
[0035]
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A circuit board 43 is mounted in the circuit case 4 along the length direction. The circuit board
43 constitutes a signal processing unit that processes a signal from the microphone unit 31. The
circuit board 43 incorporates various circuits such as an impedance conversion circuit including
an FET and an output circuit. The second terminal 42 is connected to the input terminal of the
circuit board 43 via a suitable conductive material.
[0036]
The rear case 5 is fitted into the rear end of the circuit case 4, and the circuit case 4 and the rear
case 5 are fixed by screws 6. The rear end of the circuit board 43 is inserted into the notch
groove 51 formed in the inside of the rear case 5, and the circuit board 43 and the rear case 5
are electrically connected.
[0037]
Note that one end of a plate spring (not shown) is inserted between the rear end of the circuit
board 43 and the cutout groove 51, and the other end of the plate spring is attached to the rear
case 5. May be electrically connected.
[0038]
An insulating connector base 52 is fitted in the rear case 5 and fixed by screws or the like.
In the connector base 52, a connector composed of three conductive pins is embedded. The
connector is, for example, a first pin 53 for grounding, a second pin 54 on the hot (HOT) side of a
signal, and a cold (as defined in EIAJ RC-5236 Latch lock type round connector for audio
equipment ). It is an output connector having a third pin 55 on the COLD side. The first pin 53
is connected to the ground terminal of the circuit board 43. The second pin 54 is connected to
the output terminal on the hot side of the output circuit of the circuit board 43. The third pin 55
is connected to the output terminal on the cold side of the output circuit of the circuit board 43.
[0039]
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A switch 44 is accommodated on the front end plate 41 side in the circuit case 4. The operation
of the switch 44 will be described later.
[0040]
A connector plug (not shown) is inserted into the rear case 5. The audio signal output from the
microphone unit 31 is output to an external device via the 2nd pin 54 and the 3rd pin 55, and
the microphone cord connected to the connector plug.
[0041]
FIG. 5 is a longitudinal sectional view of the microphone device 1. When the male screw 3S of the
unit case 3 is screwed into the female screw 4S of the circuit case 4, the unit case 3 and the
circuit case 4 are coupled (mounted) while the spring 36 is compressed. In a state where the unit
case 3 and the circuit case 4 are mounted, the first terminal 37 of the unit case 3 is pressed
against the second terminal 42 of the circuit case 4 by the compression force of the spring 36 to
be electrically connected. .
[0042]
The audio signal output from the microphone unit 31 is input to the input terminal of the circuit
board 43 via the output terminal plate 32, the terminal 33, the spring 36, the first terminal 37,
and the second terminal 42. The circuit board 43 performs predetermined processing such as
impedance conversion, low cut, and amplification of an audio signal input from the microphone
unit 31 to generate an output signal. An output signal generated by the circuit board 43 is
transmitted to the first pin 53, the second pin 54, and the third pin 55.
[0043]
FIG. 6 is a connection configuration diagram of the switch 44 housed in the circuit case 4. The
switch 44 includes a first fixed contact 441 connected to the second terminal 42, a second fixed
contact 442 connected to the ground (ground circuit), and a movable contact 443 connected to
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the input terminal of the circuit board 43. The input terminal of the circuit board 43 to which the
movable contact 443 is connected is, for example, the gate electrode of the FET 444
incorporated in the circuit board 43.
[0044]
The switch 44 is a transfer type reed switch that is activated when the magnetic field is applied
from the outside to switch the contacts. The first fixed contact 441 is a so-called normally open
contact whose contact is closed (turned on) when a magnetic field is applied. The second fixed
contact 442 is a so-called normally closed contact in which the contact is in an open (off) state
when a magnetic field is applied. The movable contact 443 is a so-called common contact
connected to either the first fixed contact 441 or the second fixed contact 442. In the steady
state of the switch 44, the second fixed contact 442 and the movable contact 443 are connected.
[0045]
The magnet 38 of the unit case 3 applies a magnetic field to the switch 44.
[0046]
When the unit case 3 and the circuit case 4 are in the mounted state, that is, when the magnet 38
approaches the switch 44, the magnetic field generated by the magnet 38 is applied to the switch
44 and the first fixed contact 441 and the movable contact 443 Connect.
As a result, the second terminal 42 is connected to the gate electrode of the FET 444 which is the
input terminal of the circuit board 43. That is, the audio signal output from the microphone unit
31 can be input to the signal processing unit of the circuit board 43.
[0047]
On the other hand, when the unit case 3 and the circuit case 4 are separated, that is, when the
magnet 38 is separated from the switch 44, the magnetic field generated by the magnet 38 is not
applied to the switch 44 or is applied to the switch 44. The magnetic field is released, and the
second fixed contact 442 and the movable contact 443 are connected. As a result, the gate
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electrode of the FET 444 which is the input terminal of the circuit board 43 is grounded. That is,
for example, even if a charged human body touches the second terminal 42, the charge of the
human body does not flow into the gate electrode of the FET 444 via the second terminal 42, and
the FET is not broken. The second fixed contact 442 is connected to, for example, the ground
pattern of the circuit board 43. The second fixed contact 442 is also connected to the circuit case
4 when the circuit case 4 is made of metal.
[0048]
As described above, the magnet 38 and the switch 44 constitute a detection unit that detects the
attachment / detachment state of the unit case 3 and the circuit case 4. The magnet 38 is a
switching unit that switches the connection between the first fixed contact 441 and the second
fixed contact 442 included in the switch 44 and the movable contact 443 in a noncontact
manner. That is, the magnet 38 switches the connection between the first fixed contact 441 or
the second fixed contact 442 and the movable contact 443 in a state of not physically contacting
the switch 44.
[0049]
According to the embodiment described above, when the unit case 3 and the circuit case 4 detect
the separated state, the microphone device 1 grounds the input terminal of the circuit board 43,
and the unnecessary charge is the second terminal 42. It is possible to prevent the FET or the like
incorporated in the circuit board 43 from being destroyed without flowing into the input
terminal of the circuit board 43 via the
[0050]
Similarly, in the microphone device 1, when the unit case 3 and the circuit case 4 are released
from the mounted state, the connection between the first terminal 37 and the second terminal 42
is released, but at the same time, the second terminal The connection between 42 and the input
terminal of the circuit board 43 is released.
Therefore, the microphone device 1 can prevent generation of noise without inputting an
unnecessary signal to the circuit board 43.
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[0051]
Reference Signs List 1 microphone device 2 cap 2 h sound hole 3 unit case 31 microphone unit
32 output terminal plate 33 terminal 34 inner plate 35 outer plate 36 spring 37 first terminal 38
magnet 3 S male thread 4 circuit case 41 front end plate 42 second terminal 43 circuit board 44
switch 441 first fixed contact 442 second fixed contact 443 movable contact 444 field effect
transistor (FET) 4S female screw 5 rear case 51 notched groove 52 connector base 53 first pin
54 second pin 55 third pin 6 screw
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