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DESCRIPTION JPS5726192

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DESCRIPTION JPS5726192
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an assembled
state of a conventional speaker magnetic circuit, FIG. 2 is a perspective view showing
components of the magnetic circuit, and FIG. 3 relates to the present invention. FIG. 4 is a crosssectional view showing an assembled state of the speaker magnetic circuit, and FIG. 4 is a
perspective view showing components of the magnetic circuit. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · back plate, 5 · · · · · projection for positioning
Department.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
magnetic circuit, which is formed to enable positioning of a magnet relative to a center pole in
assembling the magnetic circuit. A conventional speaker magnetic circuit will be described with
reference to a sectional view showing an assembled state of FIG. 21 and a perspective view
showing components of the magnetic circuit. At the connecting corner of the center pole A and
the back plate B integrally formed with the pole A, the outer peripheral surface Ca is the same as
the inner peripheral surface Da of the magnet D at the height of the foot over the entire
circumference thereof A ring-shaped locating portion Ct with 112. '/' A-diameter is integrally
molded. Then, the assembly VC of the magnetic circuit is first placed on the magnet Di back plate
B, and the inner circumferential surface Dat of the magnet D is brought into contact with the
outer circumferential surface Ca of the positioning sC. Align concentrically and fix with adhesive.
Then, the top plate E is protruded on the lower surface of the positioning jig and fitted to the
fixed ring sFI, and the upper end of the cylindrical recess Flr center pole A circumferentially
surrounded by the ring portion F1 in this fitted state And glued to the top surface of the magnet
M) by a top plate Et-adhesive, and disposed concentrically with respect to the top plate Ek center
hole A, and by the ring portion F1, the center ball A and the top plate E Form an air gap between
the Then, after the assimilation of the adhesive, the positioning jig F is removed to complete the
assembly of the magnetic circuit. However, in the structure where the positioning portion C is
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expanded over the entire circumference of the connecting corner of the center ball A and the
pack play B as the positioning of the magnet M), the leakage from the positioning portion C is
zero leakage. The magnetic flux increases and the material used also increases. In addition, there
are drawbacks such as complicated molding die, difficult dimensioning, and quick wear etc.
Therefore, the present invention is intended to solve the above-mentioned drawbacks, such as
magnet, top plate, center pole, In the speaker magnetic circuit consisting of the back plate, the
leakage magnetic flux can be reduced as much as possible by projecting on the concentric circle
of the top plate at a predetermined distance from the positioning projection that is in contact
with the inner circumferential surface of the magnet. In addition, it is an object of the present
invention to provide a speaker magnetic circuit which uses less material and simplifies molding
die. Hereinafter, the present invention will be described based on an embodiment of the
drawings. FIG. 3 is a cross-sectional view showing the assembled state of the speaker magnetic
circuit according to the present invention, and FIG. 24 is a perspective view showing the
components of the magnetic circuit. .
In the drawings, 1 is a ring-shaped magnet, 1a is an inner circumferential surface thereof, 2 is a
ring-shaped top plate, 3 is a center ball, 4 is a hack plate integrally molded with the pole 3. Then,
on the back surface of the top plate (on the back surface of the first template 2, three positioning
projections 5 for contacting the inner circumferential surface 1 a of the magnet 1 concentrically
on the bottom, top plates at predetermined intervals 2 Protrusively by integral molding. 6 is a jig
for positioning the top plate 2. A ring portion 6a having an air gap thickness is provided on the
lower end surface of the jig 6 in a projecting manner, and 6b is surrounded by the wedge ring
portion 6a. It is a cylindrical recess having the same diameter as the upper end diameter of the
center pole 3. Next, assembly of the magnetic circuit by the reading component will be described.
First, the top plate 2 is fitted to the ring portion 6 a of the jig 6, and the top surface of the
magnet 1 is joined to the back surface of the top plate 2 with an adhesive. The magnet 1 and the
top plate 2 are arranged concentrically in contact with the friend positioning projection 5. Then,
in the above state, the cylindrical recess 6bt of the jig 6 is fitted to the upper end of the center
ball 3 and the lower surface of the magnet 1 is adhered to the upper surface of the back plate 4
with an adhesive.・) 1. · 'Jun / 1 and the top plate 2 are arranged concentrically with respect to
the center pole 3, and an air gap is formed between the cavity plate 2 and the center pole 3 by
the ring portion 6a 0 and 0 After the adhesive is solidified, the jig 6 is removed to complete the
assembly of the magnetic circuit. As described above, in the speaker magnetic circuit comprising
the magnet 1, the top plate 2, the center pole 3 and the back plate 4 as described above, the
position where the concentric circle of the top plate 2 abuts against the inner circumferential
surface 1a of the magnet 1 Since the protrusion for protrusion 5t is provided at a predetermined
interval, positioning of the magnet 1 can be performed without any problem, and the leakage flux
is minimized as much as possible and the protrusion 5 for positioning is used. It is less expensive
and cheaper. In addition, since the projections for positioning 5t are provided at intervals of the
foot position, the structure of the molding die becomes simple, and the wear is reduced.
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