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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a speaker using a
conventional magnetic circuit, and FIG. 2 is a cross-sectional view of a speaker using a magnetic
circuit of the invention. 10.10 'flat magnetic pole plate 20.20' magnet 30.30 'L-shaped magnetic
pole plate 40.40' magnetic air gap.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic circuit
of an electrodynamic speaker for driving a vibrating membrane provided with a signal type, flow
conductor circuit on an insulating film. Conventionally, as shown in FIG. 1, the magnetic circuit of
this type of electrodynamic speaker has grindstones 2 and 2 'and flat pole plates 1 on both
bottoms 8a and 8a' of the inverted T-shaped pole piece 3, respectively. 1 'is stacked to form a
rectangular magnetic air gap 4.4' between the inverted T-shaped convex portion 8b and the flat
pole plate 1'1 '. In order to assemble this magnetic circuit into a speaker, a means is used in
which a rectangular spiral conductive circuit provided on the insulating film is fixed at the outer
peripheral end of the insulating film as disposed in the magnetic gap 4, 4 '. In the figure, 5
indicates a vibrating membrane, 6 indicates an outer frame of the vibrating membrane 5, and 7.7
'indicates a signal input terminal to the conductor circuit. The inverted T-shaped pole piece 3 of
the magnetic circuit of the conventional example is manufactured by machining or cutting due to
its shape, and the processing cost is high. The present invention was made in order to ameliorate
such drawbacks of the conventionally known magnetic circuit, and the assembly structure of the
magnetic core circuit according to the present invention is a bent L as shown in FIG. Magnet 20
and flat pole plate 10 are stacked on the bottom plate 80a of the sand pole plate 80, and a
rectangular magnetic gap is formed between the vertical portion 80b of the L type 6 auction
plate 30 and the flat pole plate 1i, 0 A field section with a diameter of 1 '/ 2 "inserted into a book
is joined to the outer surface 1 of the vertical part 30'a of the large L-shaped sand electrode plate
80, 30'. In FIG. 5, 10 'is a flat pole plate corresponding to 10, 20' is a magnet corresponding to
20, 30 'corresponds to 30 J,> '42 m 1' '' N'- '. L-shaped electrode plate, rectangular magnetic gap
corresponding to 40 'or 40', 5 back diaphragm, 60: outer membrane of diaphragm 50 <-frame,
70. 70 ': signal input to conductor circuit The terminals are shown respectively. A processing
means for cutting the short length of a predetermined width and a predetermined length at a
predetermined thickness and bending it into an L-shape when manufacturing L-shaped electrode
plates so, 3o ′ of such a magnetic circuit having the same shape Is taken. Such a processing
means is an easy processing means as compared to the structure-based means and the means for
cutting taken when producing the above-mentioned inverted T-shaped magnetic pole plate 3, and
is excellent in mass productivity. Therefore, it is an assembly structure of a magnetic circuit
which can be inexpensively manufactured and can provide a speaker inexpensively.
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