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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing caulking fastening of a
conventional frame and a round yoke, and FIG. 2 is a structural view showing a speaker of the
present invention. DESCRIPTION OF SYMBOLS 10 ... Frame, 11 ... Tubular part, 20 ... Round yoke,
21 ... Outer peripheral part of round yoke.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for
coupling a frame for a small speaker and a cup-shaped magnetic circuit. Conventionally, in the
joint structure of the frame and magnetic circuit portion of this type of gutter-shaped nobeakers,
as shown in FIG. 1, a step having a shoulder portion 2b on the outer periphery of the upper end
edge portion 2a of the circular yoke 2 And the bottom opening edge 1a of the frame 1 fitted in
the old one is crimped on the edge 1a on it to secure against the darkness with the shoulder 2b,
In order to wear it, about 0 to 1.0 mm is required as a scale, and the allowable swing of the
damper 3 is reduced. In order to improve such a deficiency of a structure of caulkingly fastening
a frame and a circular yoke which are conventionally known, the speaker of this invention is
formed at the bottom of the frame l '. Cylindrical part j-1 to make it fly 2 せ る. . Outside 6. It is
what I wore to □ 1. The thick type of the cylindrical part formed at the bottom of the frame 10 is
about 12 mm to about 25 mm in diameter and about 3 mm to about 15 mm in depth for a small
speaker, and the material is about 0.5 mm to about 08 mm It is a shape that can be press-formed
using an iron plate or can be processed very easily and has excellent mass productivity. The
circular yoke 20 can be completed only by pressing, and there is no need to machine and cut a
step having a back portion 2b after pressing like a conventional yoke 2'-) There is no need to
narrow down the allowable vibration amplitude such as machinability, long life and so on, and
can provide a small adult speaker. 8
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description, jps5657585
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