JPH11341583A - Output connector device for microphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a connector case to an earth terminal with low impedance without removing a coating film or the like beforehand by configuring a connector such that a tapered part of a male screw bites in the edge of a throughhole of the connector case as the male screw is tightened. SOLUTION: A screw containing hole 21 of a base 2 contains a tightening male screw 7A that is screwed with a female screw 61. A throughhole 101 as a tool insertion hole is drilled and provided at a position opposite to the screw containing hole 21 to a connector case 10. The male screw 7A is provided with a screw main body around which screw threads screwing with the female screw 61 are cut and a head that is formed at one end side of the screw main body, that is, at the side of the connector case 10. A tapered part (shoulder) with a prescribed inclined angle is formed between the head and the screw main body. The connector is configured such that the tapered part bites in the edge of the throughhole 101 at the side of the connector case 10 as the male screw 7A is tightened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microphone output connector device, and more particularly to a microphone output connector device capable of coupling a microphone case to a ground terminal of a connector with a very small impedance.

[0002]

2. Description of the Related Art A hand-held microphone is usually provided with an output connector for connecting the microphone cable.
It is unified to the N type (corresponding to Canon XLR-3). First, the basic configuration will be described with reference to FIG. 2A is a front view, FIG. 2B is a sectional view taken along line AA, and FIG. 2C is a plan view.

According to this, a 3PIN type output connector 1 includes a base 2 made of a heat-resistant synthetic resin (for example, PBT: polybutylene terephthalate) having a substantially cylindrical shape. Plugs, that is, hot plugs 3, cold plugs 4, and shield plugs 5 are provided therethrough.

[0004] A ground terminal plate 6 is provided between the hot plug 3 and the shield plug 5. As shown in FIG. 6B, a screw housing hole 21 is formed toward the center of the base 2.

In this case, a female screw hole 61 is formed coaxially with the screw receiving hole 21 in the ground terminal plate 6, and a fixed screw screwed into the female screw hole 61 is formed in the screw receiving hole 21. Male screw 7 is stored.

The output connector 1 is disposed in a cylindrical connector case (both not shown) provided at the rear end of the microphone case, and a tool insertion hole formed in the connector case. 6B, the male screw 7 is turned, and the male screw 7 is moved to the left side in FIG. 6B and pressed against the inner wall surface of the connector case.
Is fixed in the connector case.

The main function of this type of output connector is to transmit the output signal of the microphone. On the other hand, the output connector is also an important ground point when shielding the microphone case (microphone grip). .

That is, when the impedance of the portion to which the microphone cable is connected is high, a voltage is induced at both ends of the high impedance portion under a high frequency strong electric field. In such a condenser microphone having an electronic circuit, the electronic circuit acts as a detector and emits audio frequency noise.

[0009]

SUMMARY OF THE INVENTION
It is required that the connector case of the microphone case and the ground terminal of the output connector be electrically connected with extremely small impedance.

However, the microphone case is usually made of a metal such as brass, aluminum or zinc, and its surface including the connector case is plated or baked to prevent rust. Even when plating, sebum and the like become noticeable after being gripped by hand, so a transparent coating is applied as a finish.

For this reason, even if the male screw 7 is strongly pressed against the inner wall surface of the connector case when the output connector 1 is fixed, it is difficult to secure electrical continuity due to the presence of the coating film therebetween.

Therefore, as shown in FIG. 7, a leaf spring 8 is attached to the shield plug 5 in an auxiliary manner, and when the output connector 1 is inserted into the connector case, the leaf spring 8 is attached.
Is elastically slidably contacted with the inner wall surface of the connector case, so that electrical conduction is also achieved at this portion.

However, if the spring pressure of the leaf spring 8 is too high, not only is it difficult to assemble, but also if the leaf spring 8 needs to be removed for repair or the like, the leaf spring 8 gets caught on the inner end of the connector case and the output connector 1 is removed. Becomes difficult.
On the other hand, if the spring pressure of the leaf spring 8 is too weak, electrical conduction becomes insignificant, which is not preferable.

As described above, even if the leaf spring 8 is used in combination, conventionally, in order to ensure electrical continuity, the coating film where the male screw 7 and the leaf spring 8 come into contact with each other is coated with a rotating grindstone or the like. , So that the productivity was poor.

From the viewpoint of fail-safe, FIG.
Although the shield plug 5 and the ground terminal plate 6 are electrically connected by using the connection fitting 9 as shown in FIG. 1, there are also the following problems in this regard.

That is, the connection fitting 9 is formed by a press-formed product having a fitting portion 91 for the shield plug 5 and a fitting portion 92 for the ground terminal plate 6. Although it is mounted between the plug 5 and the ground terminal plate 6, the electrical conduction becomes unstable due to rattling between the components as it is.

Therefore, the fitting portions 91 and 92 are finally soldered. However, since the connection fitting 9 is a press-formed product and has high mechanical strength, the volume when the solder cools and hardens. Stress due to shrinkage is applied to the base 2, which may cause cracks and the like to occur on the synthetic resin base 2 side.

As another method for fixing the output connector 1, the male screw 7 is removed from the screw receiving hole 21, and a male screw is inserted from the outside of the connector case through the tool insertion hole so that the ground terminal plate 6 can be fixed. There is also known a method in which the output connector 1 is screwed into the female screw hole 61 to draw the output connector 1 toward the inner wall surface of the connector case.

According to this another method, after the microphone case is painted, the counterbore is cut around the tool insertion hole of the connector case to remove the coating film, so that the connector case → male screw → earth terminal plate 6, electrical continuity can be ensured in the path leading to 6.

However, since it is necessary to perform additional processing on the microphone case and to perform screwing work from the outside, the processing cost and the number of working steps increase, which is not preferable in terms of cost.

The present invention has been made in order to solve such a problem, and an object of the present invention is to attach a very small microphone case to a ground terminal of a connector without increasing the number of work steps such as additional work and removal of a paint film. An object of the present invention is to provide a microphone output connector device that can be coupled by impedance.

[0022]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a cylindrical connector case provided at the rear end of a microphone case, and a substantially cylindrical shape housed in the connector case. A base made of synthetic resin, three plugs for hot, cold and shield penetrating the base, and a screw storage hole drilled from the peripheral surface of the base to the center of the base And a through hole formed in the connector case so as to face the screw housing hole, and a female screw hole, and the female screw hole is implanted in the base so that the female screw hole is located in the screw housing hole. Ground terminal plate, and a fixing male screw screwed into the female screw hole and movable along the screw housing hole, and the male screw is screwed through the through hole of the connector case by a screwdriver. To the inner wall of the connector case. By, by pressing in the inner wall surface, the base at the output connector apparatus of the microphone which is adapted to secure to the connector casing,
The male screw has a screw body substantially larger in diameter than the through hole, a head substantially smaller in diameter than the through hole formed on the through hole side of the screw body, and Portion and a tapered portion having a predetermined inclination angle formed between the screw body and the screw body. As the male screw moves toward the inner wall surface side of the connector case, the tapered portion becomes the through hole. It is characterized in that it comes into contact with the edge of the so as to stick.

In this case, the connector case may be provided with a rust-preventive treatment layer including its through-hole portion.
According to the present invention, the rust preventive layer is broken at the tapered portion, and reliable electrical conduction is obtained.

In the present invention, the male screw is formed of a material harder than the connector case. Since the microphone case is usually made of brass, aluminum, or zinc, the male screw is made of a harder material such as iron.

It is preferable that the male screw is formed with an engaging groove from the head to the tapered portion, in which the screw driver is engaged. The groove will act as a cutting edge for the edge of the aperture.

Further, according to the present invention, on one surface of the base, the shield plug and the ground terminal plate may be provided.
It is characterized in that it is electrically connected at both ends by a spring-elastic conductor having an engagement portion that elastically engages each of those members.

According to this, since the conductor has spring elasticity, its mounting is simple, and each engaging portion comes into close contact with the shield plug and the ground terminal plate without play. In particular, there is no need for soldering.

[0028]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to an embodiment shown in the drawings. In this embodiment, the same reference numerals are used for portions which are the same as or are considered to be the same as those of the conventional example described above.

FIG. 1 shows an output connector 1A according to this embodiment, which is connected to a connector case 1 on the microphone case side.
FIG. 6B shows a cross section similar to FIG.

Although the microphone case itself is not shown, the connector case 10 is integrally screwed to the rear end side of the microphone case, and is made of the same material as the microphone case, for example, brass, aluminum, or zinc. . The present invention relates to a connector case 1
This also includes the case where 0 is formed integrally with the microphone case.

Also in this embodiment, a screw housing hole 21 is formed in the base 2 from a predetermined portion of the peripheral surface toward the center of the base 2. The female screw hole 61 of the ground terminal plate 6 is exposed. In the screw housing hole 21, a fixing male screw 7A to be screwed into the female screw hole 61 is housed. The connector case 10 has a through hole 101 as a tool insertion hole at a position facing the screw housing hole 21.

As shown in the plan view of FIG. 2 (a) and the perspective view of FIG. 2 (b), the male screw 7A has a thread 711 around the female screw hole 61 which is screwed around. A screw main body 71 and a head 72 formed on one end side of the screw main body 71, that is, on the connector case 10 side.

In this case, the screw body 71 has a substantially larger diameter than the through hole 101 of the connector case 10, whereas the head 72 has a substantially smaller diameter than the through hole 101. I have. A tapered portion (shoulder) 73 having a predetermined inclination angle is formed between the head 72 and the screw main body 71.

Then, the tapered portion 73 from the top surface of the head 72
An engaging groove 721 for engaging, for example, a flathead screwdriver as a screwdriver is formed along the diameter line of the male screw 7 at a depth up to. In this embodiment, the male screw 7A is made of an iron material, and its surface is plated with nickel.

By inserting a flathead screwdriver through the through hole 101 of the connector case 10, rotating the male screw 7A in a predetermined direction, and pulling the male screw 7A to the connector case 10 side (the left side in FIG. 1), this output is obtained. The connector 1A is fixed in the connector case 10.

At this time, as shown in the cross-sectional view of FIG. 3, the tapered portion 73 contacts the corner of the edge of the through hole 101 while rotating, so that the coating film at the corner is peeled off. The male screw 7A and the connector case 10 are reliably electrically connected.

Further, in this embodiment, since the engaging groove 721 is cut into the tapered portion 73, the tapered portion 7
Since the portion of the engaging groove 721 in 3 functions as the cutting blade 722 for the edge of the through hole 101, the coating film is more effectively removed. Note that the cut piece is discharged from the engagement groove 721.

As described above, according to the present invention, the male screw 7A
Removes the paint film while removing the through-hole 101 of the connector case 10.
Since the metal surfaces stick to each other at the edges, they are coupled with low impedance, and there is no risk of loosening due to vibration or the like. Therefore, it is not necessary to apply an adhesive or the like for preventing loosening after tightening.

FIG. 4 is a plan view of the output connector 1A, which shows a state in which the ground terminal plate 6 and the shield plug 5 are electrically connected by the elastically deformable conductor 9A. Have been.

As shown in the plan view of FIG. 5, the conductor 9A is made of a press-formed product of a leaf spring material 90 having a predetermined width.
01 is formed, and a second engagement portion 902 for the shield plug 5 is provided on the other end side.

In this embodiment, since the ground terminal plate 6 is made of a metal square plate, the first engaging portion 901 is formed in a substantially U-shape along one side surface thereof. Further, since the shield plug 5 is a round pin, the second engaging portion 902 is formed in a semicircular shape along the peripheral surface.

In the original dimensions, the first engagement portion 901 and the second
The interval between the engaging portions 902 is wider than the interval between the ground terminal plate 6 and the shield plug 5. For attachment, the first engagement portion 901 and the second engagement portion 902 from inside the base 2
After being attached to the ground terminal plate 6 and the shield plug 5, respectively, the forcible movement is performed toward the outside of the base 2.

In the mounted state, the first engagement portion 90
The distance between the first and second engaging portions 902 is made smaller than the distance of the original size, and due to the spring reaction force, each of the engaging portions 901 and 902
Are in close contact with the ground terminal plate 6 and the shield plug 5, respectively, so that it is not necessary to solder them.

As described above, according to the present invention, the earth terminal plate 6 and the shield plug 5 can be reliably connected by a so-called one-touch operation. Note that a spring wire may be used instead of the leaf spring.

[0045]

As described above, according to the present invention,
In a so-called 3PIN type output connector, a tapered portion is provided between the screw main body and the head of the male screw for fixing, and the tapered portion is formed with a through hole in the connector case side with the tightening of the male screw. The connector case and the ground terminal can be connected with low impedance without removing the coating film or the like in advance by sticking to the edge.

Further, by using a conductor having spring elasticity as a means for connecting the ground terminal and the shield plug, the ground terminal and the shield plug can be reliably connected by a so-called one-touch operation.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a microphone connector according to the present invention.

FIG. 2 is a front view showing a male screw for fixing in the embodiment and a perspective view of a main part thereof.

FIG. 3 is an enlarged sectional view of an essential part for explaining the operation of the male screw for fixing.

FIG. 4 is a plan view of a microphone connector according to the present invention.

FIG. 5 is a plan view of a conductor used for the microphone connector of FIG. 4;

FIG. 6 is a front view for explaining a basic configuration of a 3PIN type microphone connector, and its AA line sectional view and plan view.

FIG. 7 is a front view and a plan view showing a microphone connector as a conventional example.

FIG. 8 is a plan view showing a connection fitting conventionally used for connecting a ground terminal and a shield plug.

[Explanation of symbols]

 Reference Signs List 1A Microphone connector 2 Base 21 Screw storage hole 3 Hot plug 4 Cold plug 5 Shield plug 6 Ground terminal plate 61 Female screw hole 7A Male screw for fixing 71 Screw body 72 Head 721 Engagement groove 73 Taper portion 9A Conductor 90 Leaf spring 901, 902 Engagement part 10 Connector case 101 Through hole (tool insertion hole)

Claims (5)

[Claims] 1. A cylindrical connector case provided at a rear end side of a microphone case, a substantially cylindrical synthetic resin base housed in the connector case, and a base penetrating through the base. Three plugs for hot, cold and shield, a screw storage hole drilled from the peripheral surface of the base toward the center of the base, and the connector case so as to face the screw storage hole. A ground terminal plate planted on the base such that the female screw hole is located in the screw receiving hole, and a female screw hole; A fixing male screw movable along the screw housing hole, and the male screw is rotated by a screwdriver through the through hole of the connector case so as to move to the inner wall surface side of the connector case. And press it against the inner wall to Wherein the male screw is formed on the screw body having a diameter substantially larger than the through hole, and on the through hole side of the screw body. A head portion having a diameter substantially smaller than the through hole, and a tapered portion having a predetermined inclination angle formed between the head portion and the screw main body. An output connector device for a microphone, wherein the taper portion contacts the edge of the through-hole so as to move toward the wall surface. 2. The connector case according to claim 1, wherein the connector case is provided with a rust preventive layer including the through-hole portion, and the rust preventive layer is broken at the tapered portion. A microphone output connector device as described. 3. The connector according to claim 1, wherein the male screw is formed of a material harder than the connector case.
Or the output connector device of the microphone according to 2. 4. The male screw is formed with an engaging groove from the head to the tapered portion to which the screw driver is engaged, and the engaging groove in the tapered portion is formed in the through hole. 4. The microphone output connector device according to claim 1, wherein the output connector device functions as a cutting blade for an edge. 5. On one surface of the base, the shield plug and the ground terminal plate are electrically conductive with spring elasticity having engaging portions at both ends for elastically engaging the respective members. The microphone output connector device according to claim 1, wherein the microphone output connector device is electrically connected to a body.