JP4958160B2 - Condenser microphone - Google Patents

Description

  The present invention relates to a condenser microphone having a structure in which a gate terminal which is an input side terminal of an impedance converter is electrically connected to a fixed pole side via a contact spring.

  The capacitor microphone includes at least an impedance converter that can input a signal voltage change of a capacitor unit formed by opposing a diaphragm and a fixed pole with a high impedance and output with a low impedance. Is formed.

  In this case, a field effect transistor (hereinafter referred to as “FET”) having a gate terminal as an input side terminal is used in a capacitor microphone as an impedance converter.

As shown in FIG. 2 of Patent Document 1 below, the FET is connected to the fixed pole side by bringing the gate terminal into contact with a relay member such as a contact spring interposed between the fixed pole and the FET. Some of them are also secured. In addition, in such an FET, the gate terminal may be soldered to a contact spring on the fixed pole side in order to strengthen conduction between the FET and the fixed pole side.
JP 2006-157332 A

  Furthermore, some condenser microphones have a structure in which the directivity can be changed by removing the unit part including the fixed pole from the microphone body part and replacing it with another unit part. .

  FIG. 5 and FIG. 6 are explanatory views showing a conventional example of a condenser microphone formed so that it can be used by exchanging the unit portion with respect to the microphone main body portion in this way.

  Among these drawings, FIG. 5 is an explanatory view showing a state in which the unit portion is removed from the microphone main body, in which (a) is an end view in a front view direction, and (b) is a right side view direction. The end views at are shown respectively. 6A and 6B are explanatory views showing a state in which the unit portion is attached to the microphone main body, in which (a) is an end view in the front view direction, and (b) is an end view in the right side view direction. Respectively.

  According to these drawings, the condenser microphone 1 includes a microphone main body 2 and a unit 9 that is detachably screwed to the microphone main body 2.

  Among these, the microphone main body 2 is formed to include at least a coupler 3 disposed on the top end opening 2a side so as to be freely screwed to the unit portion 9 side, and a printed circuit board 4 fixed by the coupler 3. Has been.

  On the printed circuit board 4 is mounted an FET 5 from which a gate terminal 5b as an input terminal is drawn out from the main body 5a side. Further, the gate terminal 5b is soldered to a contact spring 6 disposed on the main body portion 5a in order to make electrical connection with the fixed pole 9b side of the unit portion 9.

  On the other hand, the unit portion 9 includes a cover body portion 9a that is screwed to the microphone body portion 2 via the coupler 3, and a unit component member that is fixed in position by including a fixed pole 9b in the cover body portion 9a. And at least.

  In this case, a recess space 7 partitioned by the coupler 3 and the printed circuit board 4 is formed in the peripheral region of the FET 5 in the microphone main body 2, and there is a problem that the cavity resonance is easily generated by the recess space 7. It was.

For this reason, measures have been taken to prevent the occurrence of cavity resonance by filling the hollow space 7 with, for example, a silicone sealant 8 as a filler.
There was a need.

  However, in the case of adopting a method of filling the recess space 7 with the silicone sealant 8 and closing it, it is necessary to keep the condenser microphone 1 in a direction in which the silicone sealant 8 does not flow until it is cured. There was a complication on the top.

Further, since the gate terminal 5b of the FET 5 provided in the microphone main body 2 and the contact spring 6 are simply connected by soldering, the unit portion 9 is removed for replacement and exposed from the microphone main body 2. the plate spring portion 6 a of the contact spring 6 has a role problem no longer perform its as contacts to easily deform when an external force is applied from the lateral direction.

  In view of the above problems of the prior art, the present invention not only reliably prevents the deformation of the leaf spring portion of the contact spring, but also prevents the occurrence of cavity resonance originating from the hollow space. The purpose is to provide a microphone.

The present invention has been made to achieve the above object, and includes a printed circuit board on which a field effect transistor is mounted as an impedance converter, a microphone main body including at least a coupler for fixing the position of the printed circuit board, and the impedance conversion. A unit portion that includes a fixed pole that is electrically connected via a leaf spring portion of a contact spring to an input-side terminal that is drawn out from the container, and that is detachably screwed to the microphone body portion via the coupler; in the condenser microphone constructed in, the said microphone body portion of the depression space partitioned by said printed circuit board and the coupler is formed in the peripheral region of the impedance converter, flexing of the plate spring portion forgiveness In order to regulate the movement in the lateral width direction, the length direction of the leaf spring part is the wide part. Provided with a barrier portion that engages with the coupler side under a seat height that is slightly lower than the top end height of the leaf spring portion by providing an opening through which the leaf spring portion is introduced with the lateral width direction being a narrow portion. The most main feature is that the deformation due to the external force of the leaf spring portion and the generation of the cavity resonance derived from the hollow space can be simultaneously prevented by arranging the insulating deformation prevention body.

According to the present invention, the movement of the leaf spring portion of the contact spring in the lateral width direction is restricted via the insulating deformation prevention body, so that the lateral displacement is prevented even if an external force is applied from the lateral direction. Thus, the role as a contactor can be kept stable.

Further , since the insulating deformation preventing body can block the hollow space of the microphone main body, it is possible to reliably prevent the occurrence of cavity resonance originating from the hollow space.

  1 and 2 are explanatory views showing an example of a condenser microphone according to the present invention. Among these drawings, FIG. 1 is an explanatory view showing a state in which the unit portion is removed from the microphone main body, in which (a) is an end view in a front view direction, and (b) is a right side view direction. The end views at are shown respectively. 2A and 2B are explanatory views showing a state in which the unit portion is attached to the microphone main body, in which (a) is an end view in the front view direction, and (b) is an end view in the right side view direction. Respectively.

  According to these drawings, the condenser microphone 11 includes a microphone main body 12 and a unit 32 that is detachably screwed to the microphone main body 12.

  Among these, the microphone main body portion 12 having a cylindrical shape includes a support cylinder portion 14 fixed to support the printed circuit board 16 in the horizontal direction therein, a printed circuit board 16 supported by the support cylinder portion 14, and At least a coupler 19 is provided which is disposed on the top opening 13 side so as to be freely screwed with the unit portion 32 side, and fixes the position of the printed circuit board 16 on the upper surface 16a side.

  In this case, an FET 17 is mounted on the upper surface of the printed circuit board 16. As apparent from FIG. 1, the FET 17 includes a main body portion 17a, a gate terminal 17b as an input-side terminal that is pulled out from the side surface side of the main body portion 17a and bent on the upper surface side thereof, and the side surface side. And a source terminal 17c and a drain terminal 17d that are drawn out from the solder and soldered to the printed circuit board 22.

Further, the contact spring 18 disposed on the body portion 17a of the FET 17 is extended upward in the folding direction from the base portion 18a attached so as to straddle the body portion 17a and the side edge side of the base portion 18a. and a plate spring portion 18b is composed of, it is freely form electrical connections to the fixed electrode 3 6 side to be described later via the plate spring portion 18b.

  The gate terminal 17b of the FET 17 is soldered to the base portion 18a of the contact spring 18 at the tip end side.

Further, the coupler 19, sea urchin I apparent from the detailed diagram shown in FIG. 3, an internal thread portion 15 which is KokuIri on an inner peripheral surface located at the top end opening 13 of the microphone main body 12, which will be described later unit 32 Is provided with a male screw portion 19a on the outer peripheral surface thereof which can be screwed together with a female screw portion 35 provided on the inner peripheral surface 34 thereof. In addition, the code | symbol D in a figure shows the latching groove for a driver.

  In addition, in the hollow space 22 that is partitioned by the coupler 19 and the printed circuit board 16 and is formed in the peripheral region of the FET 17, an insulating deformation preventing body that restricts the movement of the leaf spring portion 18 b in the lateral width direction of the contact spring 18. 23 is arranged.

  FIG. 4 is an explanatory view showing a detailed structural example of an insulating deformation prevention body, in which (a) is a plan view, and (b) is a cross-sectional view in the direction of arrows AA in (a). , (C) shows a cross-sectional view in the direction of arrows BB in (a).

According to the figure, the insulating deformation preventing body 23 restricts the movement of the contact spring 18 in the lateral width direction of the leaf spring portion 18b, and allows the plate to bend at the time of contact with the fixed pole 36 side. An opening 25 is provided in which the length direction of the spring portion 18b is the wide width portion 25a and the horizontal width direction is the narrow width portion 25b, and the leaf spring portion 18b is introduced, and the seat height is slightly lower than the top end height of the leaf spring portion 18b. And a barrier portion 24 that engages with the coupler 19 side, and the hollow space 22 of the microphone main body 12 is freely closed through the barrier portion 24 .

  That is, the insulating deformation prevention body 23 formed using an appropriate resin having a high insulating property is provided with a large diameter portion 24a that engages with the enlarged diameter portion 20 provided on the inner side of the base portion of the coupler 19 and an inner side of the upper side. The barrier portion 24 is formed of a small diameter portion 24 b that engages with the reduced diameter portion 21.

Moreover, the insulating deformation prevention member 23 has an opening having a substantially rectangular capable out dew leaf spring portion 18b of the contact spring 18 when positioned in the recess space 22 as shown in FIGS. 1 and 2 unit 25 is formed.

  The opening 25 allows the leaf spring portion 18b to be bent (vertical direction) by making the length direction of the leaf spring portion 18b the wide width portion 25a and the width direction of the leaf spring portion 18b the narrow width portion 25b. In addition, it is possible to prevent lateral deformation due to external force.

  On the other hand, the unit part 32 includes a cover body part 33 screwed to the microphone main body part 12 via the coupler 19 and a unit component member that is fixed in position including the fixed pole 36 in the cover body part 33. And at least.

  Further, the cover body portion 33 is formed with an internal thread surface 35 provided with an internal thread portion 35 to be screwed with an external thread portion 19 a included in the coupler 19.

  Next, the operation and effect of the present invention having the above-described configuration will be described. As shown in FIG. 2, the cover body 33 can be screwed onto the microphone body 12 to be used as the condenser microphone 11.

  Further, when it is necessary to change the directivity, the unit 32 is removed from the microphone main body 12 side, and another unit 32 that has been replaced is screwed to the microphone main body 12 side, so that the condenser microphone 11 is again formed. Can be used.

Moreover, when removed the unit 32 from the microphone main body 12 side, although the plate spring portion 18b of the contact spring 18 from the top end opening 13 of the microphone main body 12 will be issued dew insulating deformation prevention member 23 Since the movement in the lateral direction can be regulated via the contact, even if external force is received from the lateral direction, the lateral displacement is prevented and the role as a contact is kept stable. Can do.

  Moreover, since the insulating deformation prevention body 23 can also block the hollow space 22 of the microphone main body 12, it is possible to reliably prevent the occurrence of cavity resonance originating from the hollow space 22.

It is explanatory drawing which shows an example of this invention in the state which removed the unit part from the microphone main-body part, Among them, (a) is an end view in a front view direction, (b) is an end view in a right side view direction. Each is shown. It is explanatory drawing which shows an example of this invention in the state which attached the unit part to the microphone main-body part, Among them, (a) is an end view in a front view direction, (b) is an end view in a right side view direction. Each is shown. It is explanatory drawing which shows the detailed structural example of the coupler arrange | positioned at the top end opening part side of a microphone main-body part, Among them, (a) is a top view, (b) is an AA arrow direction in (a). FIG. It is explanatory drawing which shows the detailed structural example of an insulation deformation | transformation prevention body, (a) is a top view, (b) is sectional drawing in the AA arrow direction in (a), (c) Shows sectional views in the direction of arrows BB. It is explanatory drawing which shows the prior art example of the capacitor | condenser microphone formed so that a unit part can be replaced | exchanged and used for a microphone main body, (a) is the front in the state which removed the unit part from the microphone main body part An end view in the viewing direction is shown, and (b) is an end view in the right side viewing direction. It is explanatory drawing shown in the state which attached the unit part to the microphone main-body part in the prior art example shown in FIG. 5, (a) is an end view in the front view direction, (b) is an end face in the right side view direction Each figure is shown.

DESCRIPTION OF SYMBOLS 11 Condenser microphone 12 Microphone main-body part 13 Top end opening part 14 Support cylinder part 15 Female thread part 16 Printed circuit board 17 Field effect transistor ( FET )
17a body portion 17b gate terminal 17c source terminal 17 drain terminal 18 contact spring 18a base portion 18b leaf spring portion 19 coupler 19a male screw portion 20 enlarged diameter portion 21 reduced diameter portion 22 hollow space 23 insulating deformation prevention body 24 barrier portion 24a large Diameter part 24b Small diameter part 25 Opening part 25a Wide part 25b Narrow part 32 Unit part 33 Cover body part 34 Inner peripheral surface 35 Female thread part 36 Fixed pole D Locking groove

Claims (1)

A microphone main body having at least a printed circuit board on which a field effect transistor is mounted as an impedance converter, and a coupler for fixing the position of the printed circuit board, and an input-side terminal drawn from the impedance converter is a leaf spring part of a contact spring. In a condenser microphone comprising a fixed pole electrically connected via a unit part that is detachably screwed to the microphone body part via the coupler,
The said coupler and said printed circuit board and in partitioned by the depression space of the impedance converter the microphone body portion formed in the peripheral region of the movement in the width direction of the plate spring portion while restricting the fixed In order to allow bending at the time of contact with the pole side, the leaf spring part is provided with an opening through which the leaf spring part is introduced in such a manner that the length direction of the leaf spring part is wide and the lateral width direction is narrow. An insulating deformation prevention body including a barrier portion that engages with the coupler side under a seat height that is slightly lower than the top end height of the spring portion is disposed, and deformation due to an external force of the leaf spring portion and in the hollow space A condenser microphone characterized in that it can simultaneously prevent generation of cavity resonance originating from it .

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