JPH0635597Y2 - Stereo microphone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a stereo microphone that is used by being attached to, for example, a video camera or a tape recorder.

“Prior Art” Conventionally, there is a stereo microphone called a one-point type stereo microphone. In this stereo microphone, a pair of microphone elements are supported so that their directional axes are oriented in different directions at a predetermined angle, the sounds coming from different directions are captured, and this sound is converted into an electrical signal to convert a stereo signal into a stereo signal. It is a structure to obtain.

FIG. 4 shows a supporting structure of a conventional one-point type stereo microphone, particularly a microphone element.

In the figure, 1A and 1B indicate a pair of microphone elements. As the pair of microphone elements 1A and 1B, for example, a capacitance type microphone element can be used.

The pair of microphone elements 1A and 1B are inserted into the microphone housing holes 3A and 3B formed in the insulating plate 2 such as a printed wiring board, and the insulating plates are placed at 180 ° opposite positions on the peripheral surfaces of the microphone elements 1A and 1B. And is fixed by the adhesive 4.

In the microphone elements 1A and 1B, the directional axes P ₁ and P ₂ are insulating plates 2
Is bonded in a direction parallel to the plate surface of the microphone, and the angle θ between the directional axes P ₁ and P ₂ is determined by the directions of the microphone storage holes 3A and 3B.

"Problems to be solved by the invention" In this type of stereo microphone, the directional axes P ₁ and P ₂
The angle θ formed by is not particularly specified, and is often changed due to the design of the video camera and the like. Therefore, according to the conventional structure shown in FIG. 4, in order to change the angle θ between the directional axes P ₁ and P ₂ , the die for punching the insulating plate 2 must be remade.

In other words, when it is necessary to make stereo microphones having different angles θ between the directional axes P ₁ and P ₂ , molds for punching the insulating plate 2 must be prepared for each type of angle.

As is well known, the mold is expensive and has a drawback of high cost.

"Means for Solving the Problem" In this invention, a metal plate is used as a holder for supporting the microphone element. A microphone housing hole for housing the microphone element is formed on the metal plate, and a narrow portion formed by cutting is provided in the portion sandwiched between the microphone housing holes, and a line facing the arrangement direction of the microphone housing holes is provided in the narrow portion. Twisting deformation is applied as an axis, and the angle θ at which the directional axes P ₁ and P ₂ face is regulated by the amount of this torsional deformation.

Therefore, according to the stereo microphone according to the present invention, when it is necessary to manufacture products in which the angle θ of the directional axis is different, it is necessary to adjust the operation amount of the machine that twists and deforms the holder that supports the microphone element.

Therefore, it is possible to easily make various stereo microphones having different directional axes, and to suppress an increase in manufacturing cost.

[Embodiment] FIG. 1 shows the structure of a holder used in the stereo microphone of the present invention.

The holder 10 used for the stereo microphone of this invention is
Microphone accommodating holes 3A and 3B for accommodating microphone elements 1A and 1B are formed on a metal plate, and microphone accommodating holes 3A and 3B are also formed.
The notches 5A and 5B are formed in the portion sandwiched by the narrow portion 6
To form.

The microphone elements 1A and 1B have their directional axes P ₁ and P ₂ orthogonal to the arrangement direction K of the microphone elements 1A and 1B, and the directional axes P ₁ and P ₂ are the plate surface of the metal plate constituting the holder 10. It is supported by the holder 10 so as to be parallel.

In this example, a case is shown in which the microphones 1A and 1B are supported by the holder 10 so that the sound receiving surfaces M thereof are opposite to each other. That is, the directional axes P ₁ and P of the microphone elements 1A and 1B are
_This is taken into consideration so that the twist amount of the narrow portion 6 may be small when a stereo microphone whose angle θ formed by ₂ is 90 ° or more is made.

The microphone receiving holes 3A, 3B are the receiving surfaces M of the microphone elements 1A, 1B.
The side contacting with is curved so that the sound receiving surface M does not contact the metal plate. A terminal 11 to be soldered to the cold side terminal 7 of the microphone element 1A, 1B is formed on the side facing the back surface of the microphone element 1A, 1B. Connect the lead wire 9A to the hot side terminals 8 of the microphone elements 1A and 1B, and hold the holder 10
The lead wire 9B is connected to the microphone, and the microphone elements 1A and 1B are connected to the circuit.

FIG. 1 shows a state before the holder 10 is twisted and deformed. As an actual manufacturing order, the holder 10 is punched from a metal plate and the narrow portion 6 is twisted and deformed by a machine that applies the twisting deformation. This torsional deformation imparts torsion about the arrangement direction K of the holes 3A and 3B as an axis.

As described above, the twisting angle θ _K is larger than 90 ° by the angle θ formed by the directional axes P ₁ and P ₂ of the _two microphone elements 1A and 1B. For example, it is θ _A as shown in FIG. , Θ
It is given by _K = 180 ° −θ _A.

As the metal plate forming the holder 10, for example, a brass plate having a thickness of about 1.6 mm can be used, and the weight of the holder 10 is relatively large. As described above, the weight of the holder 10 is increased and the holder 10 is supported by the elastic body such as rubber, so that the holder 10 acts as a kind of weight and can absorb vibration, shock and the like.

FIG. 3 shows an example of the structure when actually assembled as a microphone. The microphone elements 1A and 1B are attached to the torsionally deformed holder 10. The central hole 12A of the hold rubber 12 is fitted into the constricted portions 10A and 10B formed on the upper and lower ends of the holder 10.

The holder 10 in which the hold rubber 12 is fitted vertically is inserted into the hollow portion of the cylindrical housing 13 and is supported inside the cylindrical housing 13 via the hold rubber 12.

The cylindrical housing 13 has its peripheral surface cut out so that sound waves can reach the microphone elements 1A and 1B.

A protrusion 13A is provided on a side portion of the cylindrical housing 13. A hole is formed in this protrusion 13A, and the self-tapping screw 1
4 is screwed in and the printed board 15 is attached.

The lead wire 9A connected to the hot side terminals 8 of the microphone elements 1A and 1B and the end of the lead wire 9B connected to the holder 10 are connected to the printed board 15 and the cord 16 is connected to this connection point for relaying. At the same time, two constant voltage diodes 15A connected in parallel to the microphone elements 1A and 1B are mounted.

The cylindrical housing 13 is attached to the lower case 17. A protrusion 17A is provided on the bottom surface of the lower case 17, and a hole 17B is formed in the protrusion 17A.
Is formed. A self-tapping screw 18 is screwed into this hole 17B, and the self-tapping screw 18 allows the tubular housing 13
Attach the ear 13B protruding from the side of the to the lower case 17 by tightening.

With the tubular housing 13 attached to the lower case 17, a metal mesh 21 on the front side of the tubular housing 13, a non-woven fabric 22 disposed inside thereof, and a composite component having a sponge-like body 23 disposed inside thereof are mounted. .

Therefore, the ridges 17B are provided on both sides of the bottom surface of the lower case 17 and the pillars 17C are provided in the front part. The ridges 17B and the pillars 17C suppress the sponge-like body 23, and the sponge-like body 23 and the non-woven fabric 22 are provided.
Is closely attached to the back surface of the wire net 21.

The upper case 24 is covered on the upper side of the lower case 17 with the composite component composed of the wire net 21, the nonwoven fabric 22 and the sponge state 23 mounted on the lower case 17. At this time, the clamper 25 is inserted inside the rear plates 17D and 24D of the lower case 17 and the upper case 24. The clamper 25 has a through hole 25A for the cord 16 in the center, and holes 25B and 25C for self-tapping screws are formed at the top and bottom.

Insert the self-tapping screws 26 and 27 into the holes 25B and 25C for the self-tapping screws from the rear of the lower case 17 and the upper case 24, and tighten the self-tapping screws 26 and 27 to secure the clamper 25 to the back of the lower case 17 and the upper case 24. Hold it on the face plates 17D and 24D.

At this time, the flange portion 28A of the rubber tube 28 for pulling out the cord 16 is sandwiched between the clamper 25 and the back plates 17D, 24D of the cases 17, 24, and the rubber tube 28 for pulling out the cord is fixed to the case.

Assembling the stereo microphone is completed by tightening the self-tapping screws 26 and 27.

A plurality of slits S are formed on the bottom surface of the lower case 17 and the ceiling surface of the upper case 24 to enhance the sound collecting effect. Therefore, in order to prevent the inside from being seen through the slit S, non-woven fabric is provided on the bottom surface of the lower case 17 and the ceiling surface of the upper case 24.
Wearing 28 and 29.

"Effect of device" As described above, according to this device, the microphone element is used.
A holder 10 for supporting 1A and 1B is formed by a metal plate, and the narrow portion 6 of the holder 10 formed by the metal plate is twisted and deformed, and the directional axes P ₁ , P _{2 of the two} microphone elements 1A, 1B are formed.
Since the angle θ is attached to the angle θ, the angle θ can be freely set by changing the amount of torsional deformation.

The amount of torsional deformation can be freely changed only by adjusting the operation amount of the machine for twisting, so that a stereo microphone having a desired directional axis angle θ can be easily manufactured.

Further, since it is possible to change the operation amount of the processing machine for twisting and deforming the holder 10 without an economical burden, it is possible to make stereo microphones having various directional axis angles without increasing the cost. You can

[Brief description of drawings]

FIG. 1 is a perspective view for explaining the structure of the main part of the present invention, FIG. 2 is a plan view for explaining a twisted state, and FIG. 3 is a concrete structure for assembling into a stereo microphone. FIG. 4 is an exploded perspective view showing an example, and FIG. 4 is a perspective view for explaining a conventional technique. 1A, 1B: Microphone element, 3A, 3B: Microphone storage hole,
P _1, P _2: directional axes, 6: narrow portion.

Claims (1)

[Scope of utility model registration request] 1. A stereo microphone in which a pair of microphone elements are arranged close to each other, and the directional axes of the pair of microphone elements are supported so as to point in different directions to generate a stereo signal. B. A holder having a pair of microphone housing holes formed of a metal plate for housing the pair of microphone elements and a narrow portion provided in a portion sandwiched by the pair of microphone housing holes, C. The microphone element is inserted and fixed in the microphone housing hole formed in the holder in a direction in which the directional axis is parallel to the plate surface of the metal plate forming the holder, and the microphone housing holes are arranged in the narrow portion. A stereo microphone configured to give a torsional deformation about a line oriented in the direction so that the directional axes of the pair of microphone elements face different directions at desired angles. Down.