JPS62140598A - Manufacture of speaker unit - Google Patents

Abstract

PURPOSE:To improve the cooling effect by forming a radial slot to the upper side of a collar of a pole yoke and eliminating an adhesive in the slot while flowing a fluid from a magnetic gap just after the pole yoke and a ring magnet are adhered. CONSTITUTION:In adhering the pole yoke and the ring magnet while the upper face of the collar 1b of the pole yoke 1 and the lower face of the ring magnet 2 are applied with an adhesives respectively, an excess adhesives flows into a slot 1c. Just after the both are adhered and before the adhesives is solidified, a cover 8 covering a magnetic gap 4 is pressed closely to a top plate 3 to supply a compressed air, then the air enters the inside of a magnetic circuit from the magnetic gap 4, is blown out externally through the slot 1c and the adhesives in the slot 1c is blown out externally completely. When a diaphragm 6 and a gap 7 are vibrated while being driven by the voice coil 5 in operation, the external air goes and comes through the slit 1c and the air cools the voice coil 5 while passing through the magnetic gap 4.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a method of manufacturing a speaker unit provided with means for preventing overheating of a voice coil.

SUMMARY OF THE INVENTION In a speaker unit equipped with a magnetic circuit consisting of a pole yoke with a flange protruding from the lower end of a cylindrical member, an annular magnet, and a top plate, the upper surface of the flange of the pole yoke is bonded to the annular magnet. This is a method of manufacturing a speaker unit in which radial grooves are formed, and immediately after a pole yoke and an annular magnet are bonded, fluid is blown through a magnetic gap to remove adhesive in the grooves.

K Conventional technology: Conventionally, in a speaker unit, in order to prevent the voice coil from being destroyed due to excessive current,
It is known that a breaker or fuse for WFI is provided, or a vent hole is formed at the bottom of the ball of the pole yoke.

However, with this unreliable conventional device, parts such as a breaker are required in the case of ■, and in the case of Drilling has the disadvantage that it requires machining.

[Problems to be Solved by Invention K] The purpose of this invention is to improve the drawbacks of the above-mentioned conventional devices, and to provide a speaker equipped with voice coil overheating prevention means that does not require the use of special parts and is easy to process. An object of the present invention is to provide a method for manufacturing a unit.

Means for Solving Problem K] In order to achieve the above object, the method for manufacturing a speaker unit of the present invention provides a method for manufacturing a speaker unit of the present invention. In a speaker unit equipped with a circuit, radial grooves are formed on the upper surface of the collar of the pole yoke that is bonded to the annular magnet, and fluid is blown through the magnetic gap immediately after the pole yoke and the annular magnet are bonded. The adhesive inside the groove is removed.

[1] By doing this, when the pole yoke and the annular magnet are bonded together, the adhesive that flows into the groove formed on the upper surface of the flange of the pole yoke is completely removed before it hardens. When the vibration system vibrates, external air enters and exits the magnetic circuit through this groove, cooling the voice coil.

K Embodiment 1 An embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a vertical sectional view of the right half of a speaker unit implementing this invention, Fig. 2 is a perspective view of its pole yoke,
Moreover, FIG. 3 is an explanatory diagram showing the manufacturing method.

A magnetic circuit is formed by a pole yoke 1 consisting of a cylindrical member 1a and a flange 1b protruding from its lower end, an annular magnet 2 bonded to the top surface of the flange 1b, and a top plate 3 bonded to the top surface. There is.

A voice coil 5 is supported in a magnetic gap 4 between the cylindrical member 1C of the pole yoke 1 and the top plate 3 so as to be able to vibrate in the vertical direction, and the vibration of the voice coil 5 is transmitted to the diaphragm 6 and the cap 7 to produce sound. It is designed to be radiated to the outside as.

Four radial grooves 10 are formed in the flange portion 1b of the pole yoke 1 which is bonded to the annular magnet 2, thereby communicating the inside and outside of the magnetic circuit. This first piece 10 is formed simultaneously when the pole yoke 1 is cold forged.

Next, the manufacturing method will be explained.

When applying adhesive to the upper surface of the flange 1b of the pole yoke 1 and the lower surface of the annular magnet 2 and bonding them together, the groove 1
Excess adhesive flows into C.

Immediately after bonding the two, but before the adhesive hardens, the cover 8 that covers the magnetic gap 4 is brought into close contact with the top plate 3, as shown in FIG. The adhesive enters the inside of the circuit and is blown out through the groove 1C, at which time the adhesive in the groove 1C is completely blown out.

In use, when the diaphragm 6 and the cap 7 are driven by the voice coil 5, external air enters and exits through the groove 10 and cools the voice coil 5 as it passes through the magnetic gap 4.

In the above embodiment, compressed air is used, but the invention is not limited to this, and a liquid such as water or alcohol may also be blown into the air.

[Effects of the Invention] As explained above, the method for manufacturing a speaker unit of the present invention provides a speaker unit equipped with a magnetic circuit consisting of a pole yoke with a flange protruding from the lower end of a cylindrical member, an annular magnet, and a top plate. A radial groove is formed on the upper surface of the collar of the pole yoke to be bonded to the annular magnet, and the adhesive in the groove is injected from the magnetic gap immediately after the pole yoke and the annular magnet are bonded. By removing this, the following unique effects are achieved.

■The vibration of the vibration system allows outside air to enter and exit through the grooves in the pole yoke, cooling the voice coil, resulting in a great cooling effect.

■It is extremely easy to manufacture because there is no need to use other parts, and it is only necessary to form a groove in the pole yoke.

■By blowing in fluid before the adhesive hardens, the adhesive in the groove can be easily and completely removed.

[Brief explanation of drawings]

Fig. 1...A longitudinal cross-sectional view of the right half of a speaker unit embodying the present invention Fig. 2...A perspective view of its pole yoke Fig. 3...An explanatory diagram showing its manufacturing method 1...Pole York 1a
...Cylindrical member 1b...Brim portion 1C...
Groove 2...Annular magnet 3...Top plate 4
...Magnetic gap 5...Voice coil 6...
Vibration plate 7...Cap 8...Cover

Claims (1)

[Claims] In a speaker unit equipped with a magnetic circuit consisting of a pole yoke with a flange protruding from the lower end of a cylindrical member, an annular magnet, and a top plate, radial grooves are formed on the upper surface of the flange of the pole yoke that is bonded to the annular magnet. Immediately after bonding the pole yoke and the annular magnet, the adhesive in the groove is removed by blowing fluid through the magnetic gap.