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DESCRIPTION JPH11346400

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DESCRIPTION JPH11346400
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a speaker used in various audio equipment and video equipment.
[0002]
2. Description of the Related Art In order to improve space saving of a speaker system, there has
been a strong demand for thinner speakers, and various improvements have been made. Below,
the conventional speaker which achieved thickness reduction is demonstrated with FIG. 2 (a) and
FIG.2 (b). FIG. 2 (a) is a cross-sectional view of a thin speaker in which the damper is disposed
inside the magnetic gap and the space of the inner peripheral portion of the inner magnetic field
unit is used as the amplitude space. It is sectional drawing in the middle of the assembly for
demonstrating a method.
[0003]
According to the drawing, reference numeral 1 denotes an internal magnetic type magnetic
circuit unit, which comprises a magnet 2, a yoke 3 and a plate 4, which forms a magnetic gap 5
and has an amplitude space 6 of a damper 9 inside. The voice coil 8 fits into the magnetic gap 5
and is coupled to the inner periphery of the main diaphragm 11 whose outer periphery is
connected to the frame 7 via the edge 10. An auxiliary diaphragm 12 is coupled between the
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central portion of the damper 9 and the upper surface of the main diaphragm 11.
[0004]
The above assembly of the speaker has been performed as follows. The voice coil 8 is fitted to
the spacer 18 in advance, and the spacer 18 and the plate 4 are fitted to the plate 4 in a state
where vertical positioning can be performed. Next, the outer periphery of the edge 10 in which
the outer periphery of the main diaphragm 11 is connected to the inner periphery in advance is
connected to the frame 7, and the inner periphery of the main diaphragm 11 is connected to the
voice coil 8. At this time, the gap between the voice coil 8 and the magnetic gap 5 is kept
constant by the spacer 18. Next, the spacer 18 is removed, the outer peripheral portion of the
damper 9 is coupled to the inner peripheral portion of the plate 4, the central portion of the
damper 9 and the central portion of the sub diaphragm 12 are coupled, and the outer peripheral
portion of the sub diaphragm 12 is mainly Each was coupled to the upper surface of the
diaphragm 11 to complete the speaker.
[0005]
However, in the above-mentioned conventional speaker, since the voice coil 8 is only coupled to
the frame 7 through the edge 10 after the spacer 18 is removed, another vibration system is
used. When the position of the voice coil 8 in the magnetic gap 5 is easy to move in the process
of coupling parts (damper 9, sub diaphragm 12, etc.) and the compliance of the edge 10 is large
and the weight of the voice coil 8 is large, the voice coil 8 is Is lower than the normal position to
generate distortion, or an unnecessary force is applied when the sub diaphragm 12 and the
damper 9 are coupled, and the position of the voice coil 8 deviates from the original position.
There was a possibility of generating an abnormal sound by touching it.
[0006]
SUMMARY OF THE INVENTION The present invention provides a method of manufacturing a
speaker with stable quality and excellent mass productivity which solves the above-mentioned
conventional problems.
[0007]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the method of
manufacturing a speaker according to the present invention is characterized in that the inner
periphery of the damper and the inner portion of the auxiliary diaphragm are mounted on the
outer periphery of the center cap inserted and positioned in the vibration system assembly jig.
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The edge is connected to the voice coil via the main diaphragm coupled to the outer periphery of
the sub-vibration plate to form a vibration system unit, and a vibration system assembly jig is
removed from the vibration system unit. After that, the central convex portion of the magnetic
circuit assembly jig is a magnetic circuit unit having a magnetic gap formed of a magnet coupled
onto a yoke inserted and positioned in the magnetic circuit assembly jig and a plate coupled onto
the magnet. While inserting in the center cap, the voice coil is inserted in the magnetic gap to
specify the positional relationship between the vibration system unit and the magnetic circuit
unit The outer periphery of the damper is formed on the plate, and the outer periphery of the
edge is formed on the frame mounted on the magnetic circuit. The vibration system unit and the
magnetic circuit unit are assembled with high accuracy. Since this can be performed, it is
possible to suppress the drop, inclination and eccentricity of the voice coil with respect to the
magnetic gap, and to reduce defects due to abnormal noise and the like.
[0008]
According to the first aspect of the present invention, the inner periphery of the damper and the
inner periphery of the auxiliary diaphragm are coupled to the outer periphery of the center cap
inserted and positioned in the vibration system assembly jig, The edge and voice coil are coupled
via the main diaphragm coupled to the outer periphery of the auxiliary diaphragm to form a
vibration system unit, and after removing the vibration system assembly jig from the vibration
system unit, a magnetic circuit assembly is completed. A magnetic circuit unit having a magnetic
gap formed of a magnet coupled to a yoke inserted and positioned in the tool and a plate coupled
to the magnet, the central convex portion of the magnetic circuit assembly jig is inserted into the
center cap and Inserting the voice coil into the magnetic gap to specify the positional relationship
between the vibration system unit and the magnetic circuit unit; and The outer peripheral portion
of the edge is formed by being coupled to the frame attached to the magnetic circuit, and the
vibration system unit and the magnetic circuit unit are assembled with high accuracy with each
other to form the voice coil. It is possible to suppress defects due to abnormal noise and the like
by suppressing the drop, tilt and eccentricity with respect to the magnetic gap.
[0009]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1
(a) and 1 (b).
The same parts as in the prior art are described with the same reference numerals.
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[0010]
FIG. 1 (a) is a cross-sectional view for explaining the assembly of a vibration system unit which is
an essential part of one embodiment of the present invention, and FIG. FIG.
[0011]
According to the figure, the vibration system unit A is assembled by connecting the inner
periphery of the damper 9 to the center cap 13 and the inner periphery of the sub diaphragm 12
to the center cap 13 on the vibration system assembly jig 16 and The outer periphery of the
diaphragm 12 is coupled to the main diaphragm 11, the inner periphery of the main diaphragm
11 is coupled to the voice coil 8, and the outer periphery of the diaphragm 11 is coupled to the
inner periphery of the edge 10 to form a vibration system unit. It forms A.
[0012]
Next, the magnet 2 and the plate 4 are coupled on the yoke 3 to which the frame 7 mounted on
the magnetic circuit assembly jig 15 is coupled to form the magnetic circuit unit 1 in which the
magnetic gap 5 is formed.
[0013]
Further, the vibration system assembly unit A is removed from the vibration system assembly jig
16, and the central convex portion 15a of the magnetic circuit assembly jig 15 is inserted into
and fitted to the center cap 13.
At this time, since the vibration system unit A and the magnetic circuit assembly jig 15 are
positioned by the central convex portion 15 a and the center cap 13, the voice coil 8 is
positioned in the magnetic gap 5 without eccentricity or distortion. Ru.
[0014]
Furthermore, the outer periphery of the damper 9 is connected to the plate 4 and the outer
periphery of the edge 10 is connected to the frame 7 and removed from the magnetic circuit
assembly jig 15.
[0015]
Although the magnetic circuit unit 1 is described as being assembled on the magnetic circuit
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assembly jig 15 in the above embodiment, the magnetic circuit unit 1 may be assembled in
advance.
[0016]
As described above, according to the present embodiment, the vibration system unit A is
accurately assembled by the vibration system assembly jig 16, and positioned with the magnetic
circuit unit 1 with high accuracy via the magnetic circuit assembly jig 15. The voice coil 8 can be
accurately positioned in the magnetic gap 5 to hold the voice coil 8 in a state free from
inclination or eccentricity with respect to the magnetic gap 5, thereby suppressing the
generation of abnormal noise and reducing defects. It can be done.
[0017]
As described above, according to the speaker manufacturing method of the present invention,
since the voice coil can be assembled in a state without inclination or eccentricity with respect to
the magnetic gap, the voice coil contacts the plate to emit abnormal sound. Defects can be
reduced.
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