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JPS5112242

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DESCRIPTION JPS5112242
■ Assembling method of small acoustic transducer O Japanese Patent Application No. 45122343 [Phase] Application No. 45 (1970) December 30 @ inventor Yanagawa Haruhiro Tokyo
30 30 applicant Ashida Acoustic Co., Ltd. of Okusawacho Setagaya-ku, Tokyo □ 9 [Present]
agent patent attorney Hideo Takamura of Tokyo Osaki 3 ward Osaki 3
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view of an acoustic
transducer assembled according to the present invention, and FIG. 2 is a longitudinal side view of
a jig used for assembling the acoustic transducer of the present invention.
Detailed Description of the Invention. The present invention reverses the method of using the jig
and the assembling order thereof to the conventional method, and after the magnetic circuit is
easily assembled using the jig, the jig is simply pulled out and the magnetic circuit is simply
fitted. The present invention relates to a method of assembling a compact acoustic transducer
that can be assembled accurately and quickly. Generally, when assembling an acoustic
transducer, it is difficult to center the voice coil, and it is often done by adjusting the turn-off,
which requires time and labor, and is relatively accurate (also requires skill, The individual
difference made the result, failure occurred. Also, in the past, a magnetic circuit was first
assembled, and a jig for how to place the voice coil correctly concentrically in the air gap has
been considered, but the problem that still requires considerable skill in assembly there were.
The present invention was developed to overcome ten problems, and provides a simple and
accurate method of assembling a compact acoustic transducer that can be easily implemented by
anyone without the need for special skills and skills. The object of the present invention is
Hereinafter, the present invention will be described with reference to the embodiment of the
drawings. The magnet 2 [111111] is mounted on the bottom of the concave hole 1a of the yoke
1 with the center of the yoke 1 and the center of the magnet 2 aligned. In this case, the top
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surface of the yoke 10 and the top surface of the magnet 2 are made to coincide with each other
at the same height. 3 is a plate-like frame made of synthetic resin or the like, and an engagement
hole 3a is provided at the center thereof, and rises slightly higher than the top of the flange 3b
on the outer periphery through a ring-shaped recess 3c from the inner flange 3b A ring-shaped
diaphragm attachment portion 3d is formed. The engaging hole 3a of the frame 3 is fitted into
the frame engaging portion 1b of the yoke 1, and the frame is stopped and fixed by the yoke 10
step 1c, and the upper end surface of the yoke 1 and the upper end surface of the inner
peripheral convex edge 3b of the frame 3 It is assembled and formed so that the height of the
upper end face of the magnet 2 may be made to correspond. 4 is a plate-shaped resin diaphragm
so that the voice coil (or movable ring) 5 attached to the center of the diaphragm is aligned with
the center of the voice coil (or movable ring) 5 and the center of the magnet 2 of the magnetic
circuit (in other words, the yoke 1) , And the peripheral edge 4a of the diaphragm 40 is adhered
to the diaphragm mounting portion 3d of the frame 3 for assembly. In this case, matching the
center of the voice coil with the center of the magnet 2 (or the yoke 1) has required considerable
skill and time. In the present invention, first, the voice coil 5 and the diaphragm 4 are fixed to the
speaker frame 3 at the correct positions in order to fix the voice coil 5 and the diaphragm 4 at
the correct positions, and then the jig 6 is pulled downward. Instead, the assembly is completed
simply by simply fitting the yoke 1 and the magnet 2 of the magnetic circuit properly connected
in advance.
It is a method that can be made accurate. The configuration of the jig 6 is as follows. The same
outer diameter a as the inner diameter S of the voice coil 5 is provided at the center of the base
6a in FIG. 2 with the same height h as the bottom surface of the yoke 1 of the magnetic circuit to
the upper end surface of the yoke 1 or the upper end surface of the second magnet. The
cylindrical column 6b having the same height as the depth of the fitting hole 3a of the frame 3 is
protruded from above the base 6a, and the outside [111111] EndPage: 1
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