JPS6315918Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sound generating device with a built-in drive circuit.

Sound generation devices with built-in drive circuits are being developed, but these devices have a structure in which the elements that make up the drive circuit are assembled on a circuit board, which is then incorporated into the case of the sound generation device. , the volume of the case becomes smaller due to the presence of each element constituting the drive circuit, which makes it difficult to assemble the iron core, permanent magnet, coil, etc. that are one component of the sound generating device. is difficult to connect to the terminal line, making assembly of the sounding device as a whole complicated.

The purpose of the present invention is to provide a sounding device that is easy to assemble, and the feature of the present invention is that each component of the sounding device is devised to facilitate assembly of the sounding device as a whole. .

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a bottomed cylindrical case made of a magnetic material, and this bottomed cylindrical case 1 has two stepped portions 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 2, 4, 2, 4, 2, 3, 2, 3, 2, 3, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2 that respectively be formed at a distance from each other in the height direction that the cylindrical case 1 is made of a magnetic material.
3 is provided, and the stepped portions 2 and 3 are provided with
A diaphragm 4 and a resonance lid 5 are placed and fixed in each case. A movable piece 6 is integrally attached to the diaphragm 4. The space between the diaphragm 4 and the resonance lid 5 is a resonance chamber 7, and the space between the bottom of the bottomed cylindrical case 1 and the diaphragm 4 is a storage chamber 9 that accommodates a drive circuit 8. The drive circuit 8 is roughly composed of a circuit board 10 and each element 11 that constitutes the drive circuit. As shown in FIGS. 2 and 3, the circuit board 10 has an insertion hole 12 bored in the center.
A pair of sector-shaped holes 13 are formed at a certain distance in the radial direction from this insertion hole 12, and the circuit board 1
The peripheral portion of the wire protrudes outward in the radial direction and serves as a protruding portion 14 for connecting a lead wire.

The bottomed cylindrical case 1 has a mounting part 15 on which the circuit board 10 is placed between the bottom part and the step part 2, and a fitting part 15 that fits into the protrusion part 14 of the circuit board 10. A hole 16 is formed in the side wall of the bottomed cylindrical case 1, and the circuit board 10 is closed by fitting the protrusion 14 into the fitting hole 16 formed in the side wall and inserting the spacer 17. It is designed to be fixed to the cylindrical case 1. Bottomed cylindrical case 1
A female screw hole 18 is formed in the bottom of the case 18 at a position corresponding to the insertion hole 12, and the iron core 19 can be screwed into the bottomed cylindrical case 1 by screwing into the female screw hole 18 from the bottom. It's like that.
The cylindrical coil 20 is mounted and fixed on a bridging portion 21 between the insertion hole 12 and the fan-shaped hole 13, and its terminal wire is extended to the protrusion 14 and soldered there. The permanent magnet 22 has a notch at its bottom, as shown in FIG. 4, so that the permanent magnet 22 passes through the fan-shaped hole 13 and comes into contact with the bottom of the bottomed cylindrical case 1.

Note that 23 is a lead wire, which can be connected to the lead wire connection portion from outside the bottomed cylindrical case 1.

As is clear from the above explanation, the present invention produces sound by mounting and fixing the cylindrical coil 20 on the circuit board 10, and attaching the drive circuit 8, permanent magnet 22, diaphragm 4, and resonance cover 5 in this order. Since the device can be configured, assembly can be easily performed.

In the above embodiments, a permanent magnet is provided on the outside of the cylindrical coil and an iron core is provided on the inside of the coil. A configuration may also be adopted in which a magnet is provided and an iron core is provided outside the coil. Further, in the embodiment, a gap is provided between the bottom of the bottomed cylindrical case and the circuit board, but the circuit board may be brought into close contact with the bottom of the bottomed cylindrical case.
Further, in the embodiment, the movable piece 6 is made of a magnetic material and the diaphragm 4 is made of a non-magnetic metal plate, but the diaphragm 4 itself may be made of a magnetic material.

Since the present invention is configured as explained above,
The sound generation device can be assembled very easily, and the permanent magnet and iron core are in contact with the bottom of the bottomed cylindrical case that penetrates the circuit board and functions as a yoke, which reduces magnetic efficiency. can also be prevented.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a sound generating device with a built-in drive circuit according to the present invention. FIG. 2 is an exploded perspective view of a sound generating device with a built-in drive circuit according to the present invention. FIG. 3 is a plan view of the circuit board according to the present invention. FIG. 4 is a perspective view of a permanent magnet according to the present invention. 1... Bottomed cylindrical case, 8... Drive circuit, 10
... circuit board, 11 ... element, 12 ... insertion hole,
13... Sector-shaped hole, 19... Iron core, 20... Cylindrical coil, 22... Permanent magnet.

Claims (1)

[Claims for Utility Model Registration] A metal cylindrical case with a bottom made of a magnetic material, and a circuit provided on the bottom side of the cylindrical case with a bottom and holding each circuit element constituting the drive circuit. a circuit board; a cylindrical coil fixed approximately at the center of the circuit board; a pair of fan-shaped holes formed in the circuit board so as to surround the outside of the cylindrical coil; an insertion hole formed in the circuit board, and a permanent magnet and an iron core that constitute a magnetic circuit together with the bottomed cylindrical case, and either the permanent magnet or the iron core is inserted into the fan-shaped hole. The permanent magnet and the iron core pass through the fan-shaped hole and come into contact with the bottom of the bottomed cylindrical case, and the other of the permanent magnet and the iron core passes through the cylindrical coil and the insertion hole. The sound generating device has a built-in driving circuit, wherein the coil end of the cylindrical coil is connected to the circuit board.