JPH0117869Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a microphone, and particularly to a structure for mounting a circuit board inside the microphone.

Some conventional microphones, particularly cylindrical wireless microphones, have a printed circuit board connected to the cylindrical case by screws.
However, such wireless microphones require space for mounting screws, which reduces the mounting space and increases the number of parts, resulting in higher costs.

The purpose of this invention is to provide a microphone that solves the above problems.

Hereinafter, this invention will be explained in detail based on one embodiment shown in the drawings. In FIG. 1, reference numeral 1 denotes a head case in which a microphone element 2 is housed wrapped in a protective cover 3. A female thread (not shown) is cut on the inner peripheral surface of the rear end of the head case 1, and is screwed into a male thread 6 carved on the outer peripheral surface of the front end of the short tubular connecting portion 5. A head case 1 is connected to a connecting part 5.

A female thread (not shown) is cut into the inner circumferential surface of the rear end of the connecting portion 5, and this is connected to the battery case 8.
It is threadedly engaged with a male screw 9 cut on the outer circumferential surface of the front end of the connecting portion 5 and the battery case 8.
This battery case 8 has three discs between two discs 10 and 11.
It is connected by book frames 12, 12, 12, and three batteries (not shown) are housed in the space between each frame 12, 12, 12.

A pair of mounting pieces 14 , 14 are provided at the front end of the battery case 8 so as to penetrate into the connecting portion 5 .
These mounting pieces 14, 14 are provided at positions slightly deviated above the horizontal center line of the mounting plate 14, and elongated holes 16, 16 are formed in these mounting pieces 14, 14, respectively.

These elongated holes 16, 16 are provided with a low frequency circuit board 1.
Tapered protrusions 20, 20 provided on both side edges of 8
are engaged, and the low frequency circuit board 18 is attached to the mounting pieces 14 and 1.
4, the connecting portion 5 is supported within the head case 1. The low frequency circuit on the low frequency circuit board 18 amplifies the output of the microphone element 2, and the output of this circuit is supplied to the high frequency circuit via a lead wire (not shown) passing through the side of the battery case 8. be done.

Further, 22 and 24 are disk-shaped printed circuit boards to which battery contact fittings (not shown) are attached, and these disk-shaped printed circuit boards 22 and 24 are arranged at both ends of the battery case 8.

Further, a frame 34 is formed that is connected to the battery case 8 and houses a high-frequency circuit printed circuit board 30. As shown in FIGS. 1 to 3, this frame 34 includes an annular front plate 36 and a switch 38.
and a rear plate 42 having an opening through which the antenna bushing 40 is pulled out, and a gutter-shaped connecting member 44 that connects the front plate 36 and the rear plate 42, and is integrally formed of synthetic resin or the like. Ru.

Both upper edges 45, 45 of this gutter-shaped connecting member 44 are
It is located slightly below the axis of the frame 34, and the printed circuit board 30 is placed on the upper edges 45, 45.

In addition, the front plate 36 and the rear plate 4 inside the gutter-shaped connecting member 44
A pedestal 46 is provided approximately halfway between the trough-shaped connecting member 44 and the trough-shaped connecting member 44, and a screw insertion hole 48 is provided so as to pass through the pedestal 46 from the outer surface to the inner surface of the gutter-shaped connecting member 44. Note that this screw insertion hole 48 is
A counterbore is provided so that the head of the screw 50 to be inserted does not protrude to the outer surface of the trough-shaped connecting member 44.

A board fastener 52 is coupled onto this pedestal 46 with screws 50. The upper surface of this metal fitting 52 is in contact with the lower surface of the printed circuit board 30, and the pin-shaped portion 53 protruding upward from the upper surface of this metal fitting 52 corresponds to one pin hole 64 formed in the printed circuit board 30. is inserted and soldered. For this soldering, the pin holes 64 are plated with through holes. The metal fitting 52 has, in order from the bottom, a large diameter cylindrical part 58, a conical trapezoid part 60, and a small diameter cylindrical part 54, and is made of a material that can be soldered together with the pin part 53, such as brass plated with nickel. It is integrally formed.

In Figures 1 to 3, 70 is a ground contact spring, 72 is an antenna wire, 73 is a screw, 74 is a reverse claw for preventing falling off, 75 is a circuit component, and 76 is a female thread (not shown) on the inner peripheral surface of the front end. ) is cut into the cylindrical case 76. This cylindrical case 76 has a female thread connected to the connecting part 5.
Male thread cut on the outer surface of the rear end (not shown)
It is fixed to the connecting part 5 by screwing it into the connecting part 5.

In the wireless microphone configured in this way, when first soldering the circuit component 75 to the printed circuit board 30, the pin-shaped portion 53 is inserted into the pin hole 64 and the board fastener 52 is soldered all together. The screw 50 is inserted into the screw insertion hole 48 through the board fastener 52.
Simply fix the printed circuit board 30 to the pedestal 46 with
is fixed with its long edge in contact with the upper edge 45 of the frame 34.

Therefore, the space required on the printed circuit board 30 to fix the printed circuit board 30 to the frame 34 is only the size of one pin hole 64, and most of the space on the printed circuit board 30 is used as mounting space. Therefore, high-density circuit components 75 can be mounted.

As explained above, according to this invention, it is possible to realize a circuit board mounting structure for a microphone, which allows high-density mounting of circuit components and is suitable for incorporating into a cylindrical case of a wireless microphone, which is desired to be miniaturized. Moreover, the work required to attach the printed circuit board is only to solder one support to the printed circuit board and screw this support to the gutter-like member, and the work efficiency is very good.

In the above embodiment, the pin holes 64 are plated with through-holes, but this is because the solder reaches the top surface of the printed circuit board 30 during soldering.
This is because the printed circuit board 30 and the board fastener 52 are soldered more firmly.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a wireless microphone embodying this invention, FIG. 2 is a longitudinal cross-sectional view of a portion of the microphone, and FIG. 3 is a cross-sectional view of the same microphone. 2... Microphone element, 30... Printed circuit board, 34... Frame, 50... Screw, 52...
Board fastener, 53... pin-shaped part, 64... pin hole, 76... cylindrical case.

Claims (1)

[Scope of utility model registration request] A cylindrical outer shell, a microphone element attached to one end of the outer shell, a gutter-like member provided at a lower part within the outer shell and having an upper edge substantially along the axis of the outer shell; A circuit board for processing the output signal of the microphone element, which is disposed with both ends in contact with the upper edge, and the upper surface is in surface contact with approximately the center of the lower surface of this board, and the lower surface is in surface contact with the inner surface of the gutter-like member. one support arranged to
A wireless microphone comprising: a pin protruding from the upper surface of the supporter, penetrating the substrate in the vertical direction thereof, and soldered to the substrate.