JPS6035356Y2 - speaker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a speaker in which the dust cap is improved to provide the center portion of the diaphragm with surface strength against vibrations, thereby preventing the center portion of the diaphragm from bending during large amplitudes.

Generally, a speaker was constructed as shown in FIG.

That is, a plate 2 having a center pole 1, a ring-shaped magnet 3, and a ring-shaped upper plate 4.
A frame 6 is coupled to a magnetic circuit 5 constituted by,
The peripheral edge of the diaphragm 8 is bonded to the periphery of the frame 6 together with the gasket 7 with adhesive, the voice coil 9 is bonded to the center of the diaphragm 8, and the middle portion of the voice coil 9 is held by a damper 10. Then, the lower part of the voice coil 9 was fitted into the magnetic gap 11 of the magnetic circuit 5 without eccentricity, and a dust cap 12 was attached to the center upper surface of the diaphragm 8.

By the way, in conventional speakers of this kind, particularly those used outdoors, heat-molded polyolefin sheets have been used as the diaphragm 8 and dust cap 12 in consideration of water resistance and moisture resistance.

The diaphragm 8 made of this polyolefin sheet is made of polyolefin mixed with carbon or short aramid fibers as a reinforcing agent, and this results in a reduction in the thickness of the molded portion, particularly the deep drawing portion.

Therefore, the center part has the thinnest wall thickness, and the largest stress is applied to the center part of the diaphragm 8 that connects the voice coil 9.The diaphragm cannot withstand the stress caused by the large amplitude at the time of excessive input, and the diaphragm The problem was that it bent at the center of the 8, making it impossible to play it correctly thereafter.

Furthermore, the thickness of the central portion of the diaphragm 8 does not become thinner only when the diaphragm 8 is made of a polyolefin sheet, but the same tendency appears when press-molding metal foil.

The present invention aims to eliminate the above-mentioned conventional drawbacks and provide a speaker in which the central part of the diaphragm can withstand stress at large amplitudes by improving the dust cap. .

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3, but the overall structure of the speaker is the same as that shown in FIG. 1 above, and only the dust cap, which is a feature of the present invention, will be explained here. .

In FIGS. 2 and 3, the dust cap 12 is made of metal foil such as titanium or aluminum, and has a circular plate portion 1 in the center that is equal to the inner diameter of the bobbin 9' of the voice coil 9.
3, and has a concave line 14 rising upward around this disc part 13, and has a connecting part 15 to the diaphragm 8 on the outer periphery of this concave line 14, and this connecting part 15 has a radial direction. It is constructed by providing a large number of ribs 16 at regular intervals.

The upper part of the bobbin 9' of the voice coil 9 is a diaphragm 8.
The dust cap 12 is connected to the central part of the dust cap 12 and is fitted into the inner surface of the groove 14 of the dust cap 12.

Note that the ribs 16 of the joint portion 15 are such that even if the damper 12 is formed of thin metal foil, the joint portion 15 to the diaphragm 8 has sufficient mechanical strength, and the thin center portion of the diaphragm 8 has sufficient resistance to vibration. It works to provide surface strength.

As the speaker of the present invention is constructed as described above, even if the connecting part of the diaphragm to the voice coil is formed thin due to molding, it can be reinforced with the dust cap, and when a large amplitude is applied due to a large input, a large It has the advantage of being able to prevent the thin part from bending even when stress is applied, prolonging the life of the diaphragm, and improving input resistance, and is of great practical value. .

[Brief explanation of drawings]

FIG. 1 is a half-sectional view of a general speaker, FIG. 2 is a sectional view of essential parts of an embodiment of the speaker of the present invention, and FIG. 3 is a top view of a dust cap used in the speaker. 5... Magnetic circuit, 6... Frame, Diaphragm, 9... Voice coil, 10
...Damper, 11...Magnetic gap, 12...Dust gap, 13...
Disc portion, 14... Concave stripe, 15... Joining portion, 16... Rib.

Claims (1)

[Scope of utility model registration request] A voice coil is coupled to the center of a diaphragm whose periphery is coupled to a frame coupled to a magnetic circuit, this voice coil is fitted into the magnetic gap of the magnetic circuit, and a dust cap is attached to the top center of the diaphragm. In the above-mentioned speaker, the dust cap has a disc part in the center, and an upward groove around the disc part,
A speaker having a configuration in which a plurality of ribs in the radial direction are provided around the concave line and a connecting part to the center of the diaphragm, and the upper part of the voice coil is fitted to the inner surface of the concave line.