JPH0649040Y2 - Condenser microphone - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a condenser microphone, and more specifically, to a microphone unit and a main body having an electric circuit for converting an acoustic signal from the microphone unit into an electric signal. The present invention relates to a joint portion of a condenser microphone that is detachably configured.

[Conventional technology]

There is provided a condenser microphone in which a main body unit having a built-in electric circuit for converting an acoustic signal from a microphone unit into an electric signal is made common and microphone units of various types and performances can be exchanged. An example of such a condenser microphone will be described with reference to FIG. 2. A microphone unit portion 1 including a condenser microphone unit (not shown) has a circumferential portion 2 having a screw formed on an outer peripheral surface at a lower portion thereof, and the circumferential portion 2 And a conductive pin 3 protruding downward from a substantially central portion of the. The cylindrical main body 4 containing an electric circuit (not shown) has an inner peripheral surface at the upper end,
An inner screw 5 that is screwed into the screw of the circumferential portion 2 is formed.
A partition wall 6 made of an insulating material is fitted and fixed in the main body portion 4, and a signal electrode pin 7 connected to an electric circuit is provided at the substantially central portion of the partition wall 6 from the upper surface of the partition wall 6 to the upper end thereof. It is mounted so as to project. A conductive coil spring 8 is attached to the upper end of the signal electrode pin 7 so that its end is located coaxially with the signal electrode pin 7. The upper end of the coil spring 8 is adapted to fit in a conductive spring receiver 9 provided at the lower end of the pin 3 when the microphone unit 1 is screwed.

[Problems to be solved by the device]

Signal transmission between the microphone unit in the unit section 1 and the electric circuit in the main body section is, for example, via the screw of the cylindrical section 2 and the internal screw 5 of the main body section 4 on the negative side, and the pin 3 and the spring receiver 9 on the positive side. , The coil spring 8 and the signal electrode pin 7. However, in such a connection method, the impedance on the plus side becomes extremely high, and there is a possibility that vibration noise may occur due to the displacement of the coil spring 8. Therefore, there is a method in which an elastic material such as a sponge is inserted into the inside of the coil spring 8 to reduce the vibration noise, but individual differences are apt to occur depending on the conditions of the incorporation and the like, and the vibration noise is made uniform. It was difficult. Further, since the coil spring 8 and the spring receiver 9 are contacted with each other by the point contact between the upper edge of the coil spring 8 and the lower surface of the spring receiver 9, the contact portion is corroded or dust is caught at the time of attachment / detachment, resulting in poor contact. Is likely to occur and is a factor that causes electrical noise.

Therefore, an object of the present invention is to provide a condenser microphone that suppresses vibration of a coil spring, which is a factor of vibration noise, and makes stable contact.

[Means for Solving the Problems]

In this invention, a microphone unit part having a built-in condenser microphone unit and a cylindrical main body part having an electric circuit are detachably joined, and the electric connection between the condenser microphone unit and the electric circuit is made from the condenser microphone unit. In a condenser microphone that includes a projecting connection pin and a coil spring provided in a main body whose one end and one end elastically contact each other, the diameter of the connection pin is approximately equal to the inner diameter of the coil spring. However, the main body portion has an axial length equal to at least the axial length of the coil spring, and an insulating elastic support portion having an opening whose diameter is substantially equal to the coil spring outer diameter. It is inserted in this opening, and the microphone unit and main body are joined together. When the connection pin is characterized in being inserted while being in contact with the inner diameter of the coil spring.

[Action]

When the main body is connected to the microphone unit, the connecting pin is inserted into the inner diameter of the coil spring, and the outer peripheral surface of the connecting pin contacts the inner peripheral surface of the coil spring. In addition, the contact portion can be self-cleaned by the wiping effect at the time of insertion and removal, so that the best contact state can be always maintained. Also, since the outer peripheral surface of the coil spring is housed in the opening of the elastic support portion and the inner peripheral surface is held by the connecting pin, vibration noise caused by displacement of the coil spring due to external vibration is extremely generated. Since it is difficult and the coil spring can be braked, the generation of vibration noise can be prevented.

〔Example〕

The invention will be described below with reference to an embodiment shown in FIG. In addition, the same reference numbers are given to the components that are considered to be the same as or substantially the same as those of the above-described conventional example, and the detailed description thereof will be omitted. The conductive pin 11 protruding downward from substantially the center of the microphone unit 1 has an upper portion 12 having a diameter larger than the inner diameter of the coil spring 13 and a lower portion.
14 has a diameter substantially equal to the inner diameter of the coil spring 13. On the other hand, the coil spring 13 is supported by a partition wall 15 fitted and fixed in the main body 4. This bulkhead 15
Is made of a relatively hard synthetic resin such as polytetrafluoroethylene or polycarbonate, and has a truncated cone shape having an upper flat portion above the body portion 4 in the axial direction. Partition 15
An opening 16 having a diameter larger than the outer diameter of the coil spring 13 and having an axial length substantially equal to the axial length of the coil spring 13 is provided in the central portion of the coil spring 13. Cylindrical elastic body approximately equal to the outer diameter of
17 is inserted coaxially. The elastic body 17 is made of a synthetic resin having elasticity and flexibility such as silicon or vinyl chloride. The signal electrode pin 7 is provided at the bottom of the opening 16 so that one end thereof projects into the opening 16 and the other end projects from the lower surface of the partition wall 15.

Therefore, when the circumferential portion 2 of the microphone unit portion 1 is fitted to the upper end of the main body portion 4 and the screw of the circumferential portion 2 is screwed to the inner screw 5 of the main body portion 4 and connected, the conductive pin 11 The lower portion 14 is inserted into the inner diameter of the coil spring 13. When the microphone unit part 1 is completely fitted into the main body part 4, the upper end part of the coil spring 13 comes into contact with the boundary step part between the upper part 12 and the lower part 14 of the conductive pin 11, and the coil spring 13 is axially moved. Compressed. Since the outer peripheral surface of the conductive pin 11 is in contact with the inner peripheral surface of the coil spring 13 as described above, the two can be contacted at a large number of points, and the contact is ensured, and the contact portion is self-cleaned by the wipe effect at the time of this insertion and removal. Therefore, it is possible to maintain the best contact state at all times, because it is unlikely that a contact failure will occur due to a change with time of the contact portion or pinching such as sticking when attaching or detaching. Further, since the outer peripheral surface of the coil spring 13 is accommodated in the elastic body 17 of the partition wall 15, the outer peripheral surface of the coil spring 13 is held while being pressed into the elastic body 17, and the inner peripheral surface is inserted. Further, since it is held by the lower portion 14 of the conductive pin 11, vibration noise caused by displacement of the coil spring 13 due to external vibration can be made extremely unlikely to occur.

[Effect of device]

As described above, the condenser microphone of this invention is
The diameter of the connection pin is approximately equal to the inner diameter of the coil spring, the coil spring has an axial length equal to its axial length, and its diameter has an opening approximately equal to the coil spring outer diameter. Since it is inserted into the opening of the flexible elastic support portion, when the microphone unit portion and the main body portion are connected, the connection pin is inserted into the inside diameter of the coil spring, and the outer peripheral surface of the connection pin is inside the coil spring. The two can be in contact with each other at many points on the peripheral surface, and the contact can be ensured. Further, since the contact portion can be self-cleaned by the wiping effect at the time of this insertion or removal, the contact failure is unlikely to occur due to the change over time of the contact portion or the adhesion of dust, and the best contact state can always be maintained. Also,
Since the outer peripheral surface of the coil spring is housed in the opening of the elastic support portion and the inner peripheral surface is held by the connecting pin, vibration noise caused by displacement of the coil spring due to external vibration is extremely unlikely to occur. Therefore, stable contact can be maintained for a long time without being affected by the secular change of the coil spring, and the coil spring can be braked, so that the generation of vibration noise can be prevented.

[Brief description of drawings]

FIG. 1 is an exploded side view showing an embodiment of the present invention by cutting only a part of the joint, and FIG. 2 shows a conventional condenser microphone as shown in FIG. It is a disassembled side view cut and shown. In the drawings, 1 is a microphone unit part, 2 is a circumferential part, 4 is a body part, 5 is an internal screw, 7 is a signal electrode pin, 11 is a conductive pin, 12 is an upper part thereof, 13 is a coil spring, and 14 is a conductive pin. , 15 is a partition wall, 16 is an opening, and 17 is an elastic body.

Claims (1)

[Scope of utility model registration request] 1. A microphone unit section having a built-in condenser microphone unit and a cylindrical main body section having an electric circuit built therein are detachably joined, and the electrical connection between the condenser microphone unit and the electric circuit is made as described above. In a condenser microphone that is configured by a connection pin protruding from a condenser microphone unit and a coil spring provided in the main body portion whose lower end and one end thereof elastically contact, the diameter of the connection pin is the inner diameter of the coil spring. And has an axial length at least equal to the axial length of the coil spring in the main body portion, the diameter of which is substantially equal to the outer diameter of the coil spring. It has an elastic support and the coil spring is inserted in this opening. When said microphone unit section and the main body portion are joined, the connecting pin condenser microphone characterized in that it is inserted while making contact with the inner diameter of the coil spring.