JP2008147794A - Microphone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a microphone capable of reducing displacement in a connector pin caused by soldering, by reducing the number of locations that require soldering. <P>SOLUTION: The microphone has a microphone unit incorporated in a microphone case, and a microphone connector 4. The microphone connector 4 has a cylindrical connector case 6, provided integrally in the microphone case and used for inserting a cable-side connector, and a pin insert 5 fixed in the connector case 6; the pin insert 5 has a base 7, fixed in the connector case 6 and a plurality of connector pins 11, 12, 13 integrated with the base 7 for holding, while they pass through the base 7; the edge of at least one connector pin is brought into contact with the circuit pattern of a circuit board 3, built in the microphone case via conductive cloths 41, 42, 43; and the connector pin is electrically connected to the circuit pattern of the circuit board 3. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a microphone, and in particular, has a feature in an electrical connection structure between a connector pin constituting a microphone connector and a circuit board built in the microphone.

  The audio signal converted by the microphone is output from the microphone body to the outside through the balanced shield cable. The microphone and the balanced shield cable can be attached and detached by, for example, a 3-pin type microphone connector. As the microphone connector, for example, a standardized one such as a connector defined in EIAJ RC-5236 [Latch Lock Round Connector for Audio Equipment] (see Non-Patent Document 1) is generally used.

  FIG. 6 shows an example of a microphone having a microphone-side connector (hereinafter referred to as “microphone connector”) among the standardized connectors. The example of the microphone shown in FIG. 6 can apply the technical idea according to the present invention. Here, an example of a conventional microphone will be described with reference to FIG. In FIG. 6, a microphone unit 2 is incorporated inside a front end portion (left end portion in FIG. 6) of a cylindrical microphone case 1. The microphone unit 2 receives sound waves and converts them into electrical sound signals. A circuit board 3 is built in the microphone case 1 so that the audio signal is impedance-converted by an impedance converter incorporated in the circuit board 3 and further subjected to appropriate signal processing such as amplification. It has become. The standardized microphone connector 4 is incorporated on the inner peripheral side of the rear end portion of the microphone case 1.

  The standardized microphone connector 4 described in Non-Patent Document 1 is a male connector, the pin insert 5 is disposed in a cylindrical connector case 6, and the pin insert 5 and the connector case 6 are coupled by a screw 9. Has been. A round hole 61 (see FIG. 9) for inserting a driver for rotating the screw 9 is formed in the peripheral wall of the connector case 6.

  7 to 9 show the pin insert 5. 7 to 9, the pin insert 5 includes a base 7 made of an insulating material, for example, a molding resin, and three connector pins 11, 12 penetrating the base 7 in the thickness direction and provided integrally with the base 7. , 13. The outer periphery of the base 7 is formed in a columnar shape along the inner periphery of the connector case 6, and screw holes 8 are formed from the outer peripheral surface toward the center in the radial direction. The base 7 is located at the end on the back side of the connector case 6, and the screw 9 screwed into the screw hole 8 and the round hole 61 of the connector case 6 are in a corresponding positional relationship. The screw 9 can be rotated by inserting a screwdriver through the six round holes 61. The screw 9 protrudes radially outward from the outer peripheral surface of the base 7, the portion corresponding to the shoulder of the screw 9 hits the inner peripheral surface of the connector case 6, and the outer peripheral portion on the opposite side of the base 7 from the insertion portion of the screw 8. The pin insert 5 is fixed in the connector case 6 by being pressed against the inner peripheral surface of the connector case 6.

  A circular circuit board 10 is disposed on the microphone connector 4 in close contact with the outer surface of the base 7, that is, the right surface in FIG. 6, and a shield case 14 is fixed so as to cover the circuit board 10. ing. A predetermined circuit pattern is formed on the circuit board 10, and circuit components such as a diode and a capacitor are soldered to a predetermined soldering land of the circuit pattern. The three connector pins 11, 12, 13 penetrate the circuit board 10, and each connector pin 11, 12, 13 is soldered to a predetermined circuit pattern on the circuit board 10 at a penetration position of the circuit board 10. Yes. The shield case 14 is formed in a flat dish shape and covers the circuit components mounted on the circuit board 10. The three connector pins 11, 12, 13 penetrate the shield case 14. Of the three connector pins 11, 12, and 13, one connector pin 11 is a grounding pin that fits into a hole in the shield case 14, and the connector pin 11 and the shield case 14 are electrically connected by solder 18. Connected. The other two connector pins 12 and 13 are audio signal pins and are separated from the through holes formed in the shield case 14. The connector pin 11 is connected to the connector case 6 and the microphone case 1 via the ground pattern of the circuit board 10, and is connected to the shield wire of the microphone cable via the cable connector coupled to the microphone connector 4. A guide projection 15 for fixing the pin insert 5 by fixing the position of the pin insert 5 in the rotation direction with respect to the connector case 6 is integrally formed on the outer periphery of the base 7.

  The rear end portions of the connector pins 11, 12, 13 protruding from the inner end surface of the base 7 through the base 7 are electrically connected to predetermined circuit patterns of the circuit board 3 built in the microphone case 1. Connected. In the microphone case 1, the circuit board 3 is arranged with one end in the longitudinal direction facing and close to the inner end surface of the base 7, and the rear end portions of the connector pins 11, 12, 13 are predetermined circuit patterns of the circuit board 3. It overlaps with. However, since the connector pins 11, 12, and 13 are arranged along a circle concentric with the outer periphery of the base 7, the height positions with respect to the surface of the circuit board 3 are different. Therefore, the rear end portions of the connector pins 11 and 12 and the rear end portion of the connector pins 13 are arranged so that the front surface and the back surface of the circuit board 3 are sandwiched. Further, the outer surface positions of the connector pins 11 and 12 that contact one surface of the circuit board 3 (this surface is the surface) and the outside of the connector pin 13 that is in contact with the other surface of the circuit board 3 (this surface is the back surface). The distance from the side surface position is smaller than the thickness dimension of the circuit board 3. Therefore, a cut 31 is formed from one end in the longitudinal direction of the circuit board 3 at a position corresponding to the connector pin 13 of the circuit board 3, and a part of the outer peripheral surface of the rear end portion of the connector pin 13 enters the cut 31. Thus, it is possible to arrange the rear end portions of the connector pins 11 and 12 on the front surface side of the circuit board 3 and the rear end portion of the connector pins 13 on the rear surface side. The circuit board 3 is formed with circuit patterns to be electrically connected to the connector pins 11, 12, 13 at positions corresponding to the rear ends of the connector pins 11, 12, 13. The rear end portions of the connector pins 11, 12, 13 are soldered, and the circuit patterns and the connector pins 11, 12, 13 are electrically connected. 7 and 8, reference numeral 51 denotes solder for connecting the connector pin 11 and the circuit pattern, reference numeral 52 denotes solder for connecting the connector pin 12 and the circuit pattern, and reference numeral 53 denotes solder for connecting the connector pin 13 and the circuit pattern. Respectively.

  As described above, in the microphone connector 4, the shield case 14 is placed on one end surface of the base 7 of the pin insert 5 so that high-frequency current from the outside does not enter the microphone, and the connector pin 11 for grounding is provided. It is electrically connected to the shield case 14 by soldering. Such a configuration is also described in Patent Document 1 and Patent Document 2. Further, if each connector pin is directly soldered to a predetermined circuit pattern on the circuit board as in the conventional example shown in FIG. 6 and subsequent figures, it is not necessary to wire each connector pin and the circuit pattern with a wire. Therefore, it is possible to prevent the wire portion from causing noise due to the high frequency current.

Japan Electronics Manufacturers Association Standard EIAJ RC5236 Latch Lock Type Round Connector for Audio Equipment JP 2005-94575 A JP 2005-311752 A

  In the conventional microphone connector part, the grounding connector pin and the shield case are soldered, and the connector pin and the circuit board of the connector part are soldered. Such a structure has room for improvement. I found out. That is, when the solder is hardened, the volume is reduced (referred to as “volume reduction”), and thereby a force that attracts the soldered object works. This attractive force varies depending on various conditions such as the amount of solder and the shape of the part to be soldered. In the soldering portion of the grounding connector pin 11 and the shield case 14 as in the example of the microphone connector described above, a stress that tilts the connector pin 11 is exerted by the attractive force due to the hardening of the solder 18. In addition, the heat of soldering is transmitted to the base 7 made of an insulator such as a resin, the base 7 is softened, the holding force of the connector pin is loosened, and the stress is easily inclined. In particular, today, lead-free solder has been promoted from the viewpoint of environmental protection, and lead-free solder has a high melting point. Therefore, it is necessary to heat the soldered portion at a high temperature for a long time. This also contributes to tilting the connector pin.

Furthermore, when focusing on the soldering in the microphone connector having a structure that prevents the intrusion of the high-frequency current as described above, when assembling the connector,
(1) Solder circuit components such as a diode and a capacitor to the circuit board 10.
(2) The circuit board 10 and each connector pin are soldered.
(3) The connector pin 11 for grounding and the shield case 14 are soldered.
(4) As shown in FIG. 6 and subsequent figures, soldering is performed to electrically connect the rear ends of the connector pins to a predetermined circuit pattern of the circuit board 3 built in the microphone case.
There are 4 steps of soldering.

  The base 7 is made of a heat-resistant resin such as polybutylene terephthalate (PBT) as a material. However, when the soldering is performed at a high temperature for a long time over four steps as described above, Even if it is a certain resin, the holding force of the connector pin press-fitted into this is loosened, and the connector pin is displaced. Since the method of loosening the connector pin, how to apply the stress, and how to apply heat are not constant, there is a problem that the displacement of the connector pin varies, and the insertion / extraction force of the cable connector with respect to the microphone connector varies. There may be a problem that the cable connector cannot be inserted.

  The present invention provides a microphone capable of reducing the displacement of connector pins caused by soldering by eliminating the above-described conventional problems and reducing the number of parts that require soldering. Objective.

  A microphone according to the present invention includes a microphone case, a microphone unit built in the microphone case, and a microphone connector provided in the microphone case. The microphone connector is provided integrally with the microphone case and the cable side connector is inserted. A cylindrical connector case and a pin insert fixed in the connector case. The pin insert is held integrally with the base in a state of passing through the base and the base fixed in the connector case. A plurality of connector pins, and at least one of the connector pins is in contact with the circuit pattern of the circuit board built in the microphone case via a conductive cloth so that the connector pin is electrically connected to the circuit pattern of the circuit board. The most main features that are connected to To.

At least one end of the plurality of connector pins is in contact with the circuit pattern of the circuit board built in the microphone case via a conductive cloth, and the connector pin is electrically connected to the circuit pattern of the circuit board. Even without soldering, the connector pins and the circuit board can be electrically connected, and the heating amount of the base due to soldering is reduced.
Soldering to the connector pins by configuring the other connector pins so that the connector pins are electrically connected to the circuit pattern of the circuit board by contacting the circuit pattern of the circuit board via the conductive cloth. The number of locations can be further reduced, and the amount of heating of the base by soldering can be further reduced.
In this way, it is possible to provide a microphone that can reduce the displacement of the connector pin due to soldering, can smoothly attach and detach the cable connector, and can stably maintain the contact state.

  Hereinafter, embodiments of a microphone according to the present invention will be described with reference to the drawings. Since the embodiment of the microphone according to the present invention includes many of the same components as those of the conventional microphone shown in FIGS. 7 to 9, the same components are denoted by common reference numerals.

  As shown in FIG. 6, the microphone according to the present invention includes a cylindrical microphone case 1, the microphone unit 2 is located inside the front end portion of the microphone case 1, and the above-described inner periphery side of the rear end portion of the microphone case 1. The standardized microphone connector 4 is incorporated. The microphone unit 2 receives sound waves and converts them into electrical sound signals. The electroacoustic conversion format of the microphone unit is not particularly limited, but the illustrated example is an example of a condenser microphone including a condenser microphone unit. A circuit board 3 is built in the microphone case 1. In the case of a condenser microphone, the circuit incorporated in the circuit board 3 includes an impedance converter, and the sound signal is impedance-converted by the impedance converter and further subjected to appropriate signal processing such as amplification and output. It has become so. This output signal is transmitted from the microphone connector 4 to a predetermined external circuit or device via a cable connector and a cable coupled to the microphone connector 4.

  As in the conventional example, the microphone connector 4 has a pin insert 5 disposed in a cylindrical connector case 6, and the pin insert 5 and the connector case 6 are coupled by a screw 9. A circular hole 61 (see FIG. 3) for inserting a driver for rotating the screw 9 is formed in the peripheral wall of the connector case 6.

  1 to 3 show the pin insert 5 in detail. 1 to 3, a pin insert 5 includes a base 7 made of an insulating material, for example, a molded resin, and three connector pins 11 and 12 provided integrally with the base 7 in a state of passing through the base 7 in the thickness direction. , 13. The outer periphery of the base 7 is formed in a columnar shape along the inner periphery of the connector case 6, and screw holes 8 are formed from the outer peripheral surface toward the center in the radial direction. The base 7 is located at the end on the back side of the connector case 6, and the screw 9 screwed into the screw hole 8 and the round hole 61 of the connector case 6 are in a corresponding positional relationship. The screw 9 can be rotated by inserting a screwdriver through the six round holes 61. The screw 9 protrudes radially outward from the outer peripheral surface of the base 7, the portion corresponding to the shoulder of the screw 9 hits the inner peripheral surface of the connector case 6, and the outer peripheral portion on the opposite side of the base 7 from the insertion portion of the screw 8. The pin insert 5 is fixed in the connector case 6 by being pressed against the inner peripheral surface of the connector case 6.

  In the microphone connector 4, a circular circuit board 10 is disposed in close contact with the back surface of the base 7, that is, the left surface in FIGS. 1 and 6, and the shield case 14 covers the circuit board 10. Is fixed. A predetermined circuit pattern is formed on the circuit board 10, and circuit components such as a diode and a capacitor are soldered to a predetermined soldering land of the circuit pattern. The three connector pins 11, 12, 13 penetrate the circuit board 10, and each connector pin 11, 12, 13 is soldered to a predetermined circuit pattern on the circuit board 10 at a penetration position of the circuit board 10. Yes. Further, the rear end portions of the connector pins 11, 12, and 13 also penetrate the holes of the shield case 14, but the rear end portions of the connector pins 12 and 13 and the shield case are separated from each other so that there is no electrical continuity. The rear end portion of the pin 11 is press-fitted into the hole of the shield case and is electrically connected. The connector pin 11 is a connector pin for grounding.

  In the illustrated embodiment, the shape of the three connector pins 11, 12, 13 and the connection relationship of the three connector pins 11, 12, 13 to the shield case 14 and the circuit board 3 will be described below. There is a feature. The rear end portions of the connector pins 11, 12, 13 that penetrate the base 7 in the axial direction and project inward from the rear end surface (left end surface in FIG. 1) of the base 7 to the microphone case 1 are connected to the microphone case 1. A predetermined circuit pattern of the built-in circuit board 3 is contacted via conductive cloths 41, 42, 43, and the connector pins 11, 12, 13 are electrically connected to the predetermined circuit pattern of the circuit board 3. Yes. The conductive cloths 41, 42, and 43 are formed by weaving conductive thin wires several times in a cloth-like or non-woven cloth shape. For example, "SUI-10-70X" manufactured by Seiren Co., Ltd. can be used. . Conductive cloths 41, 42, 43 cut into squares of an appropriate size are interposed between the rear ends of the connector pins 11, 12, 13 and a predetermined circuit pattern on the circuit board 3.

  One end in the longitudinal direction of the circuit board 3 is close to the rear end face of the base 7 and faces the rear end face of the base 7, and a plurality of connector pins 11 and 12 are arranged on one side of the circuit board 1 (this is the front side). The other connector pins 13 are arranged on the other surface side of the circuit board 3 (this is the back surface side). In this way, the rear end portions of the connector pins 11 and 12 and the rear end portion of the connector pins 13 are arranged so as to sandwich the front surface and the back surface of the circuit board 3. In addition, the distance between the outer surface position of the connector pins 11 and 12 that contact the surface of the circuit board 3 and the outer surface position of the connector pin 13 that contacts the back surface of the circuit board 3 is smaller than the thickness dimension of the circuit board 3. Therefore, a notch 31 is formed from one end in the longitudinal direction of the circuit board 3 at a position corresponding to the connector pin 13 of the circuit board 3, and a part of the outer peripheral surface of the rear end portion of the connector pin 13 is made to enter the notch 31. Thus, it is possible to arrange the rear end portions of the connector pins 11 and 12 on the front surface side of the circuit board 3 and the rear end portion of the connector pins 13 on the rear surface side. The rear ends of the connector pins 11 and 12 are electrically connected to a predetermined circuit pattern via conductive cloths 41 and 42. The conductive cloth 43 is disposed across the cuts 31, and the connector pins 13 press the conductive cloth 43 toward the cuts 31 from the back side of the circuit board 3, so that both ends of the conductive cloth 43 are connected to the circuit board 3. It is pressed against the circuit pattern. The conductive cloth 43 is in surface contact with the connector pin 13 along the outer peripheral surface thereof in a partial arc shape to reduce the contact resistance with the connector pin 43. Since the conductive cloth has elasticity against compression from the front and back, the contact resistance between the connector pins 11 and 12 and the conductive cloth 41 and 42 and the contact between the conductive cloth 41 and 42 and the circuit pattern corresponding to the contact resistance. Less resistance. Thus, the conductive cloths 41, 42, 43 electrically connect the respective connector pins 11, 12, 13 and the respective circuit patterns in an excellent manner.

According to the embodiment described above, since it is not necessary to solder between the connector pins 11, 12, and 13 and the circuit pattern of the circuit board 3, the heat generated by the soldering is transmitted to the base 7 and the connector by the base 7 is used. The pin holding force is not loosened, and the connector pin is not displaced. In addition, there is an effect that power consumption required for soldering can be reduced.
Note that at least one of the plurality of connector pins 11, 12, 13, for example, only the grounding connector pin 11 may be in contact with the circuit pattern via the conductive cloth. Also by this, it can reduce that the temperature of the base 7 rises by soldering.

  Next, another example of the connector pin configuration that can be added to the above embodiment and the connection structure with the shield case will be described. 4 and 5 show another example of the pin insert 5 that can be applied to the present invention. 4 and 5, one end of the connector pins 11, 12, and 13, more specifically, on the outer peripheral surface of the rear end that is opposite to the side where the cable connector is coupled with the base 7 as a boundary. , Knurled portions 11a, 11b, and 11c are formed. Knurling is also called “knurling”, in which ridges and grooves are alternately formed in the circumferential direction on the outer peripheral surfaces of the connector pins 11, 12, and 13. The knurled portions 11 a, 11 b, and 11 c of the connector pins 11, 12, and 13 are formed so that the ridges and the grooves are arranged in parallel with the central axes of the connector pins 11, 12, and 13.

  The shield case 14 is formed in a flat dish shape and covers the circuit board 10 fixed in close contact with the rear end surface of the base 7 together with circuit components mounted on the circuit board 10. The three connector pins 11, 12, 13 pass through individual holes formed in the shield case 14. Of the three connector pins 11, 12, and 13, one connector pin 11 is a ground pin, and its knurled portion 11 a is press-fitted into the hole of the shield case 14, so that the connector pin 11 and the shield case 14 is strongly hit and electrically connected. The hole of the shield case 14 may be a circular hole, and the diameter of this hole is made smaller than the maximum outer diameter of the knurled portion 11a so that the knurled portion 11a bites into the peripheral portion of the hole of the shield case 14, The contact area is increased. The hole of the shield case 14 may be similar to the cross-sectional shape of the knurled portion 11a and may be smaller than the cross-sectional dimension of the knurled portion 11a. Thus, since the connector pin 11 and the shield case 14 are physically and directly joined and electrically connected, it is not necessary to solder both. The connector pin 11 is also electrically connected to the ground pattern of the circuit board 10, connected to the connector case 6 and the microphone case 1 via the ground pattern, and via a cable connector coupled to the microphone connector 4. Connected to the shielded cable of the microphone cable.

  The other two connector pins 12 and 13 are audio signal pins, and the knurled portions 12a and 13a are separated from the through holes formed in the shield case 14. That is, the diameter of each through hole is formed larger than the maximum outer diameter of the knurled parts 12a and 13a. The knurled portions 11 a, 12 a, and 13 a of the three connector pins 11, 12, and 13 are press-fitted into the through holes of the circuit board 10. These through holes may be circular holes, the diameter of which is smaller than the maximum outer diameter of the knurled portions 11 a, 12 a, 13 a so that the knurled portions 11 a, 12 a, 13 a are the periphery of the hole of the circuit board 10. Both contact areas are increased by biting into the part. The holes of the circuit board 10 may be similar to the cross-sectional shape of the knurled portions 11a, 12a, and 13a, and may be smaller than the cross-sectional dimensions of the connector pins 11, 12, and 13. The knurled portions 11a, 12a, and 13a bite into the predetermined circuit patterns formed at the peripheral portions of the holes of the circuit board 10 and strongly hit them, and the circuit patterns and the connector pins 11, 12, and 13 are physically connected. And directly joined and electrically connected. Since the circuit pattern and the connector pins 11, 12, 13 are electrically connected in this way, there is no need to solder the circuit pattern of the circuit board 10 and the connector pins 11, 12, 13.

  A guide projection 15 for fixing the pin insert 5 by fixing the position of the pin insert 5 in the rotation direction with respect to the connector case 6 is integrally formed on the outer periphery of the base 7.

  According to the embodiment shown in FIGS. 4 and 5 described above, the connector pin 11 is directly and electrically joined to the shield case 14. In addition, the three connector pins 11, 12, 13 are directly electrically joined to the circuit pattern of the circuit board 10. Therefore, it is not necessary to solder between the connector pins 11, 12 and 13, the shield case 14, and the circuit patterns of the circuit board 10. In addition, knurled portions 11a, 12a, and 13a formed at the rear ends of the connector pins 11, 12, and 13 are incorporated in the microphone case 1 via the conductive cloths 41, 42, and 43, respectively. The circuit board 3 is electrically connected to a predetermined circuit pattern. Therefore, it is not necessary to solder the connector pins 11, 12, 13 to the predetermined circuit pattern of the circuit board 3, so that the holding force of the connector pins due to the heating of the base 7 is not loosened. Will not be displaced. In addition, there is an effect that power consumption required for soldering can be reduced.

  It is not always necessary to provide the knurled portion on all of the plurality of connector pins. Even if the knurled portion is provided only on at least one connector pin, for example, the grounding connector pin 11, the intended purpose can be achieved. This is because the soldering between the connector pin 11 for grounding and the shield case 14 and the soldering between the connector pin 11 and a predetermined circuit pattern on the circuit board 10 can be omitted.

It is a plane sectional view showing the example of the microphone connector which is the principal part of the microphone concerning the present invention. It is a left view of the said microphone connector. It is front sectional drawing of the said microphone connector. It is a plane sectional view of a pin insert applicable to the present invention. It is front sectional drawing of the said pin insert. The example of the microphone concerning this invention is shown, (a) is the longitudinal cross-sectional view seen from the plane direction, (b) is the longitudinal cross-sectional view seen from the front direction. It is a top sectional view showing the example of the microphone connector which is the principal part of the conventional microphone. It is a left view of the said conventional microphone connector. It is front sectional drawing of the said conventional microphone connector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Microphone case 2 Microphone unit 3 Circuit board 4 Microphone connector 5 Pin insert 6 Connector case 7 Base 8 Screw hole 9 Screw 11 Connector pin 12 Connector pin 13 Connector pin 14 Shield case 11a Knurling part 12a Knurling part 13a Knurling part 31 Notch 41 Conductive cloth 42 Conductive cloth 43 Conductive cloth

Claims (9)

A microphone case, a microphone unit built in the microphone case, and a microphone connector provided in the microphone case;
The microphone connector has a cylindrical connector case that is provided integrally with the microphone case and into which the cable-side connector is inserted, and a pin insert that is fixed in the connector case.
The pin insert has a base fixed in the connector case and a plurality of connector pins held integrally with the base in a state of penetrating the base.
A microphone in which an end portion of at least one connector pin is in contact with a circuit pattern of a circuit board built in a microphone case via a conductive cloth, and the connector pin is electrically connected to the circuit pattern of the circuit board.   2. The connector pins according to claim 1, wherein the end portions of all the connector pins are in contact with the circuit pattern of the circuit board built in the microphone case via a conductive cloth, and each connector pin is electrically connected to the circuit pattern of the circuit board. Microphone.   2. The microphone according to claim 1, wherein some of the plurality of connector pins are arranged on one side of the circuit board, and the other connector pins are arranged on the other side of the circuit board.   2. The microphone according to claim 1, wherein an end portion of at least one connector pin is fitted into a cut formed in the circuit board, and an end portion of the conductive cloth disposed across the cut is in contact with the circuit pattern of the circuit board.   2. The microphone according to claim 1, wherein an end portion of each connector pin electrically connected to a circuit pattern on the circuit board is an end portion of the connector pin protruding from the inner end face side of the base.   2. The microphone according to claim 1, wherein the microphone is a condenser microphone, and the circuit formed on the circuit board includes an impedance conversion circuit for impedance-converting an audio signal converted by the condenser microphone unit.   2. The microphone according to claim 1, wherein end portions of the connector pins electrically connected to the circuit pattern of the circuit board are knurled.   One of the connector pins whose ends are knurled is press-fitted into a hole of a shield case arranged so as to cover the end surface of the base constituting the pin insert, and is electrically connected integrally with the shield case. The microphone according to 1. 9. The microphone according to claim 8, wherein the connector pin electrically connected to the shield case is a grounding connector pin.

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