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DESCRIPTION JPH0580095

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DESCRIPTION JPH0580095
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker magnetic circuit used for various weight-reduced audio devices.
[0002]
2. Description of the Related Art In recent years, the weight of in-vehicle devices has been
reduced to cope with CAFE.
[0003]
A conventional speaker magnetic circuit will be described below with reference to the drawings.
FIG. 3 shows a conventional speaker magnetic circuit. In FIG. 3, 1 is a ring-shaped top plate, 2 is
a ring-shaped magnet, 3 is a bottom plate, magnet 2 on bottom plate 3 having center pole 4, and
center pole 4 on magnet 3. The ring top plate 1 forming the magnetic gap is incorporated.
[0004]
However, the above-described conventional configuration has a problem that it can not cope with
the weight reduction, which is one of the realization of low fuel consumption of the automobile
for the purpose of environmental protection.
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1
[0005]
The present invention solves the above-mentioned conventional problems, and provides a
speaker magnetic circuit that reduces the weight of the bottom plate.
[0006]
[Means for Solving the Problems] In order to achieve this object, in the speaker magnetic circuit
of the present invention, a magnet and a top plate are incorporated in a plate in which a ring
yoke is connected to a burring portion formed by burring. It is constructed.
[0007]
This configuration can reduce the weight of the hollow portion of the ring-shaped yoke.
[0008]
Embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a speaker magnetic circuit according to the present invention.
In FIG. 2, 11 is a ring-shaped yoke, 12 is a plate having a burring portion 13 protruding upward
by burring at the central portion, and an outer peripheral portion of the burring portion 13 and
an inner peripheral portion of the ring shaped yoke 11 The bottom plate 14 is configured by
press-fitting.
[0009]
A speaker magnetic circuit using the bottom plate 14 configured as described above will be
described with reference to FIG.
A ring-shaped magnet 15 is joined onto the bottom plate 14, and a ring-shaped top plate 16
forming a magnetic gap with the ring-shaped yoke 11 serving as a center pole is joined onto the
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2
magnet 15 to constitute a speaker magnetic circuit. .
[0010]
With this configuration, the portion to be the center pole is hollow ring-shaped yoke 11, so it can
be made significantly lighter in weight than the conventional center pole.
[0011]
Further, also in the manufacture thereof, the ring-shaped yoke 11 obtained by cutting a pipe into
a predetermined size is press-fit fitted to the burring portion 13 formed by simple burring as
compared to the case where the center pole is formed by forging as the bottom plate 14 It will be
easy because it is just enough.
[0012]
As described above, according to the present invention, by providing the hollow portion in the
bottom plate, the speaker magnetic circuit which can be reduced in weight is configured, and the
fuel consumption of the automobile can be reduced.
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3
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