JP2020053868A - Microphone - Google Patents

Abstract

To provide a microphone capable of preventing function lost due to static electricity with a simple circuit configuration free from lowering of the sensitivity or influence on frequency characteristics.SOLUTION: A housing 101 is formed with sound holes 102A, 102B for guiding sounds from the external to microphone elements 104A, 104B. Each of the microphone elements 104A, 104B is disposed in the housing so that the center of the signal side electrode terminal and the center of the earth side electrode terminal almost coincides with the center of each of the sound holes 102A and 102B of the housing 101. A capacitor 107, whose height is higher than the surrounding chip parts, is disposed near the sound holes 102A and 102B of the housing 101. The positive terminal of the capacitor 107 is connected to the primary side of the regulator 103, and the negative terminal is connected to the ground.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a microphone.

  In general, as a countermeasure against static electricity, the case is made of metal and the static electricity is transmitted only to the surface of the case to prevent intrusion into the case, and the creepage distance of electronic components from the case is secured, A technique for preventing static electricity from being applied directly to electronic components is used. However, such a method increases the mass and outer diameter of the product, and impairs the features and appeal of the product.

  In the microphone module, a hole called a sound hole is opened in the housing so that sound can be smoothly and efficiently transmitted to acoustic elements such as an ECM (Electret Condenser Microphone) and a MEMS (Micro Electro Mechanical Systems) microphone. I have. Usually, nothing is installed between the sound hole and the acoustic element, so that there is a problem that static electricity applied from the sound hole enters the inside of the microphone module.

  Conventionally, as an example of a countermeasure against static electricity in a microphone module of this type, there are those described in Patent Literature 1 and Patent Literature 2. In the microphone structure described in Patent Literature 1, the center of the signal-side electrode terminal and the center of the ground-side electrode terminal of the microphone are arranged to be shifted from the center of the sound collection hole of the housing. In the microphone device described in Patent Literature 2, a conductive net using a conductive material is provided between a sound collection hole and a voice input surface of the microphone to cover the inside and outside of the housing by closing the sound collection hole. I try to cut off.

JP-A-10-098790 JP 2005-086231 A

  The microphone structure described in Patent Literature 1 has a problem that the sensitivity of the microphone module may be reduced and the frequency characteristics may be affected. Further, in the microphone device described in Patent Literature 2, the cost of the conductive net itself and the work cost for incorporating the same are required, which increases the product price. Further, similarly to Patent Document 1, there is a problem that the effect on acoustic performance is not negligible.

  The present invention has been made in view of the above circumstances, and provides a microphone that can prevent functions from being lost due to static electricity with a simple circuit configuration without worrying about a decrease in sensitivity or an influence on frequency characteristics. With the goal.

  A microphone according to the present invention has a signal-side electrode terminal and a ground-side electrode terminal, and converts a sound into an electric signal to output a microphone element; and for an output signal of the microphone element, directivity control, frequency characteristic control, A digital signal processor that performs various signal processing including noise suppression, level adjustment, and output format conversion; a regulator that converts a power supply voltage into a voltage suitable for driving the microphone element and the digital signal processor; and at least the microphone element A microphone that includes a housing that houses the digital signal processor and the regulator, and a capacitor that has a positive terminal and a negative terminal, wherein the housing is configured to transmit external sound to the microphone element. A sound hole for guiding is formed, and the microphone element is provided. Is arranged so that the center of the signal-side electrode terminal and the ground-side electrode terminal substantially coincides with the center of the sound hole of the housing, and the capacitor is located near the sound hole in the housing and has a high height. The positive terminal was connected to the primary side of the regulator, and the negative terminal was connected to the ground.

  According to the above configuration, a sound hole for guiding external sound to the microphone element is formed in the housing, and the center of the signal side electrode terminal and the ground side electrode terminal of the microphone element is formed by the sound hole of the housing. Placed in the housing so as to be substantially coincident with the center, a capacitor whose height is higher than the peripheral chip components is placed near the sound hole of the housing, and the positive terminal of the capacitor is connected to the primary side of the regulator. In addition, since the negative terminal is connected to the ground, the function can be prevented from being lost due to static electricity with a simple circuit configuration without concern about a decrease in sensitivity or an influence on frequency characteristics.

  In the above configuration, the microphone element and the digital signal processor are mounted on one surface side of a printed circuit board, the capacitor is mounted on the other surface side of the printed circuit board, and the microphone element is provided on the printed circuit board. A through hole is formed in a portion where is mounted on the printed circuit board, and the printed circuit board is arranged such that the other surface side faces the sound hole side of the housing.

  According to the above configuration, static electricity discharged toward the sound hole formed in the housing can be induced in the capacitor, the positive terminal of the capacitor is connected to the primary side of the regulator, and the negative terminal is connected to the negative terminal. Because it is connected to ground, the secondary side of the regulator is not exposed to lightning. Therefore, the microphone element and the digital signal processor on the secondary side of the regulator do not receive lightning, and the function of the microphone is not lost.

  A microphone according to the present invention has a signal-side electrode terminal and a ground-side electrode terminal, and converts a sound into an electric signal to output a microphone element; and for an output signal of the microphone element, directivity control, frequency characteristic control, A digital signal processor that performs various signal processing including noise suppression, level adjustment, and output format conversion; a regulator that converts a power supply voltage into a voltage suitable for driving the microphone element and the digital signal processor; and at least the microphone element A microphone that includes a housing accommodating the digital signal processor and the regulator, and a zener diode, wherein the housing has a sound hole formed therein for guiding external sound to the microphone element. And the microphone element is connected to the signal-side electrode end. And the center of the ground-side electrode terminal is disposed so as to substantially coincide with the center of the sound hole of the housing, and the Zener diode is closer to the sound hole in the housing than the peripheral chip component. The cathode terminal was connected to the primary side of the regulator, and the anode terminal was connected to ground.

  According to the above configuration, a sound hole for guiding external sound to the microphone element is formed in the housing, and the center of the signal side electrode terminal and the ground side electrode terminal of the microphone element is formed by the sound hole of the housing. Placed in the housing so as to coincide with the center, a Zener diode whose height is higher than that of the peripheral chip components is placed near the sound hole of the housing, and the cathode terminal of the Zener diode is connected to the primary side of the regulator In addition, since the anode terminal is connected to the ground, the function can be prevented from being lost due to static electricity with a simple circuit configuration without concern about a decrease in sensitivity or an influence on frequency characteristics.

  In the above configuration, the microphone element and the digital signal processor are mounted on one surface of a printed circuit board, the zener diode is mounted on the other surface of the printed circuit board, and the microphone is provided on the printed circuit board. A through hole penetrating both sides of the printed circuit board is formed in a portion where the element is mounted, and the printed circuit board is arranged such that the other surface side faces the sound hole side of the housing.

  According to the above configuration, the static electricity discharged toward the sound hole formed in the housing can be induced to the Zener diode, and the cathode of the Zener diode is connected to the primary side of the regulator, and the anode is connected to the ground. Because it is connected, the secondary side of the regulator does not receive lightning. Therefore, the microphone element and the digital signal processor on the secondary side of the regulator do not receive lightning, and the function of the microphone is not lost.

  A microphone according to the present invention has a signal-side electrode terminal and a ground-side electrode terminal, and converts a sound into an electric signal to output a microphone element; and for an output signal of the microphone element, directivity control, frequency characteristic control, A digital signal processor that performs various signal processing including noise suppression, level adjustment, and output format conversion; a regulator that converts a power supply voltage into a voltage suitable for driving the microphone element and the digital signal processor; and at least the microphone element A microphone that includes a housing that houses the digital signal processor and the regulator, and a varistor, wherein the housing has a sound hole formed therein for guiding external sound to the microphone element. The microphone element is connected to the signal-side electrode terminal and the microphone. The varistor is arranged in such a manner that the center of the ground-side electrode terminal substantially coincides with the center of the sound hole of the housing, and the varistor is higher than the peripheral chip component in the housing in the vicinity of the sound hole, It was connected between the primary side of the regulator and ground.

  According to the above configuration, a sound hole for guiding external sound to the microphone element is formed in the housing, and the center of the signal side electrode terminal and the ground side electrode terminal of the microphone element is formed by the sound hole of the housing. The varistor is placed in the housing so as to be substantially coincident with the center, a varistor whose height is higher than that of the peripheral chip components is placed near the sound hole of the housing, and the varistor is placed between the primary side of the regulator and the ground. Since the connection is made, it is possible to prevent the function from being lost due to static electricity with a simple circuit configuration without concern about a decrease in sensitivity or an influence on frequency characteristics.

  In the above configuration, the microphone element and the digital signal processor are mounted on one surface side of a printed circuit board, the varistor is mounted on the other surface side of the printed circuit board, and the microphone element is provided on the printed circuit board. A through hole is formed in a portion where is mounted on the printed circuit board, and the printed circuit board is arranged such that the other surface side faces the sound hole side of the housing.

  According to the above configuration, static electricity discharged toward the sound hole formed in the housing can be guided to the varistor, and the varistor is connected between the primary side of the regulator and the ground. There is no lightning strike on the secondary side of the regulator. Therefore, the microphone element and the digital signal processor on the secondary side of the regulator do not receive lightning, and the function of the microphone is not lost.

  According to the present invention, it is possible to prevent a function from being lost due to static electricity with a simple circuit configuration without worrying about a decrease in sensitivity or an influence on frequency characteristics.

FIG. 1 is a diagram illustrating a schematic configuration of a microphone according to a first embodiment of the present invention. FIG. 2 is a perspective view showing an example of a mounted state of a capacitor in the microphone according to the first embodiment. FIG. 2 is a perspective view showing a capacitor mounting surface side of a printed circuit board of the microphone according to the first embodiment. FIG. 2 is a perspective view showing a microphone element mounting surface side of a printed circuit board of the microphone according to the first embodiment. The figure which shows the schematic structure of the microphone which concerns on 2nd Embodiment of this invention. The figure which shows the schematic structure of the microphone which concerns on 3rd Embodiment of this invention.

  Hereinafter, preferred embodiments for carrying out the present invention will be described in detail with reference to the drawings.

(1st Embodiment)
FIG. 1 is a diagram showing a schematic configuration of the microphone according to the first embodiment of the present invention. In FIG. 1, a microphone 100 according to the first embodiment includes a housing 101, a regulator 103, two microphone elements 104A and 104B, a DSP (Digital Signal Processor) 105, an amplifier 106, and a capacitor. 107, a power supply terminal 108, a microphone output terminal 109, and a ground (GND) terminal 110.

  The housing 101 houses a regulator 103, microphone elements 104A and 104B, a DSP 105, an amplifier 106, a capacitor 107, a power supply terminal 108, a microphone output terminal 109, a ground terminal 110, and the like. The housing 101 has sound holes 102A and 102B for guiding external sounds to the microphone elements 104A and 104B. A power supply voltage is applied to the power supply terminal 108, and the regulator 103 converts the power supply voltage applied to the power supply terminal 108 into a voltage suitable for driving the microphone elements 104A and 104B and the DSP 105. Here, a voltage suitable for driving the microphone elements 104A and 104B and the DSP 105 is, for example, 3.3 V, 1.8 V, or the like.

  Each of the microphone elements 104A and 104B has a signal-side electrode terminal and a ground-side electrode terminal (both not shown), and converts sound into an electric signal and outputs the signal. The microphone elements 104A and 104B are arranged in the housing 101 such that the centers of the signal-side electrode terminals and the ground-side electrode terminals substantially coincide with the centers of the sound holes 102A and 102B of the housing 101. The output format of each of the microphone elements 104A and 104B may be analog or digital. The DSP 105 performs various signal processings on the output signals of the microphone elements 104A and 104B, including directivity control, frequency characteristic control, noise suppression, level adjustment, and output format conversion. The amplifier 106 amplifies and outputs the analog output of the DSP 105 to a desired level. The microphone output terminal 109 outputs the output of the DSP 105 amplified by the amplifier 106 to the outside.

  The capacitor 107 is of a type having polarity, and is used for measures against static electricity. The capacitor 107 has a height higher than the peripheral chip components in the vicinity of the sound holes 102A and 102B in the housing 101, a positive terminal of the capacitor 107 is connected to the primary side (input side) of the regulator 103, and a negative electrode. The side terminal is connected to the ground. Here, the condition that the height of the capacitor 107 is higher than that of the peripheral chip component means that the capacitor 107 itself may be high, or the mounting portion of the printed circuit board on which the capacitor 107 is mounted may be increased. Is expensive, it is desirable to use a capacitor 107 that is higher than the height of the peripheral chip components. In the microphone 100 according to the first embodiment, the capacitor 107 that is higher than the height of the peripheral chip component is used.

  Here, the mechanism of the failure of the microphone due to the application of static electricity will be described with reference to FIG. If there is no capacitor 107 for countermeasures against static electricity, static electricity discharged toward the sound hole 102A (or 102B) is discharged to an arbitrary place in the housing 101. At this time, if static electricity strikes the secondary line of the regulator 103, the microphone elements 104A and 104B and the DSP 105 are connected to the secondary (output side) line of the regulator 103. Depending on the applied level, short-circuit failure may occur between the power supply of the microphone elements 104A and 104B and the ground, or between the power supply of the DSP 105 and the ground, and the function of the microphone 100 may be lost.

  Next, the effect of the capacitor 107 against static electricity will be described. FIG. 2 is a diagram illustrating an example of a mounting state of the capacitor 107 of the microphone 100 according to the first embodiment. FIG. 3 is a perspective view showing the capacitor mounting surface side (the other surface side) of the printed circuit board 115 of the microphone 100. FIG. 4 is a perspective view showing the microphone element mounting surface side (one surface side) of the printed circuit board 115 of the microphone 100. As shown in FIG. 3, on the other surface side of the printed board 115, peripheral chip components (reference numerals are omitted) are mounted in addition to the capacitor 107. As shown in FIG. 4, components on the secondary side line of the regulator 103 such as the microphone elements 104 </ b> A and 104 </ b> B and the DSP 105 are mounted on one surface side of the printed circuit board 115, including the regulator 103. I have.

  Further, as shown in FIG. 3, the printed board 115 has two through holes 116A and 116B penetrating both sides of the printed board 115 at a portion where the microphone elements 104A and 104B are mounted. That is, the through hole 116A is formed in a portion where the microphone element 104A is mounted, and the through hole 116B is formed in a portion where the microphone element 104B is mounted. The two through holes 116 </ b> A and 116 </ b> B are formed so as to be at the same positions as the sound holes 102 </ b> A and 102 </ b> B formed in the housing 101 when the printed circuit board 115 is attached to the housing 101. The capacitor 107 is located substantially at the center between the through holes 116A and 116B of the printed board 115 (that is, substantially at the center of the sound holes 102A and 102B of the housing 101). Further, as described above, the height of the capacitor 107 is higher than the height of the peripheral chip component. Specifically, the height of the capacitor 107 is set to 1.25 mm while the height of the passive component and the component of the IC (Integrated Circuit) is set to 0.23 to 0.8 mm.

  Since the height of the capacitor 107 is higher than the height of the peripheral chip components (passive components and ICs described above), static electricity discharged toward the sound holes 102A (or 102B) is induced to the capacitor 107. Since the positive terminal of the capacitor 107 is connected to the primary side of the regulator 103 and the negative terminal is connected to the ground, the secondary side of the regulator 103 is discharged by the static electricity discharged toward the sound hole 102A (or 102B). No lightning strikes. Therefore, the microphone elements 104A and 104B and the DSP 105 on the secondary line of the regulator 103 do not receive lightning, and the function of the microphone 100 does not disappear.

  As described above, according to the microphone 100 according to the first embodiment, the sound holes 102A and 102B for guiding external sounds to the microphone elements 104A and 104B are formed in the housing 101, and the microphone elements 104A and 104B are formed. The capacitor 107 is disposed in the housing 101 such that the center of the signal-side electrode terminal and the center of the ground-side electrode terminal substantially coincide with the centers of the sound holes 102A and 102B of the housing 101, and the height of the capacitor 107 is higher than that of the peripheral chip components. Since it is arranged near the sound holes 102A and 102B of the housing 101, the positive terminal of the capacitor 107 is connected to the primary side of the regulator 103, and the negative terminal is connected to the ground, the sensitivity is lowered and the frequency characteristics are reduced. The function can be prevented from being lost due to static electricity with a simple circuit configuration without worrying about the influence of the above.

(2nd Embodiment)
Next, a microphone according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a diagram illustrating a schematic configuration of a microphone 200 according to the second embodiment of the present invention. In the figure, the same components as those of FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 5, the microphone 200 according to the second embodiment has a Zener diode 120 as a component for preventing static electricity. As is well known, the Zener diode 120 is a device for obtaining a constant voltage, but since the breakdown voltage does not change even if the applied voltage is increased, it can be used as a component for preventing static electricity.

  The mounting of the microphone elements 104A and 104B, the DSP 105, the regulator 103, and the like on the printed circuit board 115 is the same as that of the microphone 100 according to the first embodiment. In addition, the zener diode 120 is mounted on the other surface side of the printed circuit board 115, like the capacitor 107.

  The Zener diode 120 is disposed substantially at the center of the sound holes 102A and 102B, and has a height higher than the height of the peripheral chip components. The cathode terminal of the Zener diode 120 is connected to the primary side of the regulator 103, and the anode terminal is connected to the ground. Here, the expression that the height of the Zener diode 120 is higher than that of the peripheral chip component means that the Zener diode 120 itself may be high or that the mounting portion of the Zener diode 120 on the printed board may be increased. Since the processing is costly, it is desirable to use a Zener diode 120 that is higher than the height of the peripheral chip component. The microphone 200 according to the second embodiment uses a Zener diode 120 that is higher than the height of peripheral chip components.

  Since the height of the component of the Zener diode 120 is higher than the height of the peripheral chip component, static electricity discharged toward the sound hole 102A (or 102B) is induced to the Zener diode 120. The cathode terminal of the Zener diode 120 is connected to the primary side of the regulator 103, and the anode terminal of the Zener diode 120 is connected to the ground.

  By providing the Zener diode 120, static electricity discharged toward the sound hole 102A (or 102B) does not strike the secondary side of the regulator 103. As a result, the microphone elements 104A, 104B and the DSP 105 on the secondary side line of the regulator 103 do not receive lightning, so that even if the static electricity is discharged toward the sound hole 102A (or 102B), the microphone 200 is not discharged. No loss of functionality.

  As described above, according to the microphone 200 according to the second embodiment, the sound holes 102A and 102B for guiding external sound to the microphone elements 104A and 104B are formed in the housing 101, and the microphone elements 104A and 104B are connected. The zener diode 120 is disposed in the housing 101 such that the center of the signal-side electrode terminal and the center of the ground-side electrode terminal substantially coincide with the centers of the sound holes 102A and 102B of the housing 101, and the height is higher than the peripheral chip components. Are arranged near the sound holes 102A and 102B of the housing 101, the cathode of the Zener diode 120 is connected to the primary side of the regulator 103, and the anode is connected to the ground, so that the sensitivity is reduced and the frequency characteristics are affected. Without a concern, the function can be prevented from being lost due to static electricity with a simple circuit configuration.

(Third embodiment)
Next, a microphone according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a diagram illustrating a configuration of a microphone 300 according to the third embodiment of the present invention. In the figure, the same components as those of FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 6, the microphone 300 according to the third embodiment has a varistor 130 as a component for preventing static electricity. As is well known, a varistor can be used as a component against static electricity because of its characteristic that the resistance value changes according to the applied voltage and the current value increases at a value larger than the threshold voltage.

  The mounting of the microphone elements 104A and 104B, the DSP 105, the regulator 103, and the like on the printed circuit board 115 is the same as that of the microphone 100 according to the first embodiment. In addition, the varistor 130 is mounted on the other surface side of the printed circuit board 115, like the capacitor 107.

  The varistor 130 is disposed substantially at the center of the sound holes 102A and 102B, and has a height higher than the height of the peripheral chip components. The varistor 130 is connected between the primary side of the regulator 103 and the ground. Here, the expression that the height of the varistor 130 is higher than that of the peripheral chip component means that the varistor 130 itself may be high, or the mounting portion of the varistor 130 on the printed board may be increased. It is desirable to use a varistor 130 that is taller than the height of the peripheral chip components because the cost increases. In the microphone 300 according to the third embodiment, the varistor 130 that is higher than the height of the peripheral chip component is used.

  Since the height of the components of the varistor 130 is higher than the height of the peripheral chip components, the static electricity discharged toward the sound hole 102A (or 102B) is guided to the varistor 130. The terminal of the varistor 130 is connected to the primary side of the regulator 103 and the ground, and the static electricity discharged toward the sound hole 102A (or 102B) does not strike the secondary side of the regulator 103. Thus, the microphone element 104A, 104B and the DSP 105 on the line on the secondary side of the regulator 103 do not receive the lightning, and the function of the microphone 300 is maintained even if the static electricity is discharged toward the sound hole 102A (or 102B). It does not disappear.

  As described above, according to the microphone 300 according to the third embodiment, the sound holes 102A and 102B for guiding the external sound to the microphone elements 104A and 104B are formed in the housing 101, and the microphone elements 104A and 104B are formed. A varistor 130 is disposed in the housing 101 such that the center of the signal-side electrode terminal and the center of the ground-side electrode terminal substantially coincide with the centers of the sound holes 102A and 102B of the housing 101, and the height of the varistor 130 is higher than the peripheral chip components. Since the varistor 130 is connected between the primary side of the regulator 103 and the ground while being disposed near the sound holes 102A and 102B of the housing 101, there is no need to worry about a decrease in sensitivity or an influence on frequency characteristics. With a simple circuit configuration, loss of function due to static electricity can be prevented.

It should be noted that the present invention is not limited to the above embodiment, and can be implemented with various modifications without departing from the spirit of the present invention.
For example, in the microphones 100, 200, and 300 according to the first to third embodiments, the output format of the microphone output terminal 109 is a monaural analog output, but a stereo analog output may be used, or the number of channels may be larger. May be. It is also possible to output as a digital format. In this case, a method of directly outputting the signal to the microphone output terminal 109 without installing the amplifier 106, or a method of appropriately using the amplifier 106 as a buffer or the like for increasing the driving capability is used. Can be replaced.

  The present invention is useful for microphones.

100, 200, 300 Microphone 101 Housing 102A, 102B Sound hole 103 Regulator 104A, 104B Microphone element 105 DSP
106 Amplifier 107 Capacitor 108 Power supply terminal 109 Microphone output terminal 110 Ground terminal 115 Printed circuit board 116A, 116B Through hole 120 Zener diode 130 Varistor

Claims (6)

A microphone element that has a signal-side electrode terminal and a ground-side electrode terminal, converts sound into an electric signal, and outputs the signal;
A digital signal processor that performs various signal processings on the output signal of the microphone element, including directivity control, frequency characteristic control, noise suppression, level adjustment, and output format conversion,
A regulator for converting a power supply voltage into a voltage suitable for driving the microphone element and the digital signal processor;
A housing for housing at least the microphone element, the digital signal processor and the regulator,
A capacitor having a positive terminal and a negative terminal;
A microphone with
In the housing, a sound hole for guiding external sound to the microphone element is formed, and in the microphone element, the center of the signal-side electrode terminal and the ground-side electrode terminal is the center of the housing. The capacitor is disposed so as to substantially coincide with the center of the sound hole, and the capacitor is higher than the peripheral chip component in the housing in the vicinity of the sound hole, and the positive terminal is located on the primary side of the regulator. Connected, the negative terminal was connected to ground,
Microphone. The microphone element and the digital signal processor are mounted on one surface side of a printed circuit board, the capacitor is mounted on the other surface side of the printed circuit board, and the microphone element is mounted on the printed circuit board A through-hole penetrating both sides of the printed board is formed in a portion, and the printed board is arranged such that the other surface side faces the sound hole side of the housing.
The microphone according to claim 1. A microphone element that has a signal-side electrode terminal and a ground-side electrode terminal, converts sound into an electric signal, and outputs the signal;
A digital signal processor that performs various signal processings on the output signal of the microphone element, including directivity control, frequency characteristic control, noise suppression, level adjustment, and output format conversion,
A regulator for converting a power supply voltage into a voltage suitable for driving the microphone element and the digital signal processor;
A housing for housing at least the microphone element, the digital signal processor and the regulator,
A Zener diode,
A microphone with
In the housing, a sound hole for guiding external sound to the microphone element is formed, and in the microphone element, the center of the signal-side electrode terminal and the ground-side electrode terminal is the center of the housing. The Zener diode is disposed so as to be substantially coincident with the center of the sound hole, the height of the Zener diode is higher than that of the peripheral chip component in the housing in the vicinity of the sound hole, and the cathode terminal is connected to the primary side of the regulator. The anode terminal is connected to ground,
Microphone. The microphone element and the digital signal processor are mounted on one side of a printed circuit board, the zener diode is mounted on the other side of the printed circuit board, and the microphone element is mounted on the printed circuit board. A through hole is formed in a portion of the printed circuit board that penetrates both surfaces of the printed circuit board, and the printed circuit board is arranged such that the other surface side faces the sound hole side of the housing.
The microphone according to claim 3. A microphone element that has a signal-side electrode terminal and a ground-side electrode terminal, converts sound into an electric signal, and outputs the signal;
A digital signal processor that performs various signal processings on the output signal of the microphone element, including directivity control, frequency characteristic control, noise suppression, level adjustment, and output format conversion,
A regulator for converting a power supply voltage into a voltage suitable for driving the microphone element and the digital signal processor;
A housing for housing at least the microphone element, the digital signal processor and the regulator,
Barista,
A microphone with
In the housing, a sound hole for guiding external sound to the microphone element is formed, and in the microphone element, the center of the signal-side electrode terminal and the ground-side electrode terminal is the center of the housing. The varistor is disposed so as to substantially coincide with the center of the sound hole, and the varistor is higher than the peripheral chip component in the housing in the vicinity of the sound hole, and is located between the primary side of the regulator and the ground. Connected,
Microphone. The microphone element and the digital signal processor are mounted on one surface side of a printed circuit board, the varistor is mounted on the other surface side of the printed circuit board, and the microphone element is mounted on the printed circuit board A through-hole penetrating both sides of the printed board is formed in a portion, and the printed board is arranged such that the other surface side faces the sound hole side of the housing.
The microphone according to claim 5.

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