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JPH06327092

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Notice
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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH06327092
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
dome-shaped speaker used in various audio equipment, and more particularly to a dome-shaped
speaker in which a frame and a diaphragm are integrally formed.
[0002]
2. Description of the Related Art Molding a speaker frame with synthetic resin is known, for
example, in Japanese Utility Model Application Publication No. 63-49993 and Japanese Patent
Application Laid-Open No. 58-171197. On the other hand, dome-shaped speakers are used in
various speaker systems because they have a wide reproduction band and good directivity and
sound quality.
[0003]
A dome-shaped speaker is difficult to be large because of its structure, and a jig for forming a
magnetic gap and a voice coil are set at the center of the magnetic gap when assembled. Voice
coil center jigs and other various jigs for setting components at a predetermined position, and
there is a process of removing the jigs after bonding the members, the dome-shaped speaker
There are problems such as poor production efficiency and difficulty in automation.
[0004]
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1
In view of the current situation, the present invention can be assembled without using a jig or the
like by integrating the diaphragm and the frame, and furthermore, by reducing the application
process of the adhesive, the process and cost of the speaker production It is an object of the
present invention to provide a dome-shaped speaker capable of reducing
[0005]
[Means for Solving the Problems] In order to achieve the above object, the dome-shaped speaker
according to the present invention is provided with a cylindrical holding portion for holding a
magnetic circuit, and the upper end opening of the holding portion. A thin dome-shaped
diaphragm, which is located above the frame and the holding portion and whose outer peripheral
edge is connected to the inner peripheral edge of the frame, is integrally molded of a synthetic
resin material. .
[0006]
In the dome-shaped speaker according to the present invention, the holding portion of the
magnetic circuit, the frame and the diaphragm are integrally molded of a synthetic resin material.
The synthetic resin to be used is preferably a thermoplastic plastic such as polycarbonate having
good heat resistance and relatively dimensional stability, but may be an engineering plastic.
The holding portion of the magnetic circuit is generally cylindrical, and the lower end opening
portion projects inward to provide a locking portion, thereby forming a magnetic plate composed
of a bottom plate having a center pole, a ring-shaped magnet and a top plate. The circuit can be
mounted in a press fit fashion.
[0007]
The dome-shaped diaphragm has a thickness of about 0.5 to 1.0 mm, and a concave attachment
for adhesively fixing the upper end of the voice coil is integrally formed at the center of the back
surface of the diaphragm. By doing this, the voice coil can be attached at a predetermined
position without using a jig.
[0008]
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2
In the dome-shaped speaker according to the present invention, when molding the frame using a
synthetic resin material, the thin dome-shaped diaphragm is integrally formed on the frame, and
hence the adhesive for fixing the diaphragm to the frame There is no need for a process.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the domeshaped speaker according to the present invention will be concretely described below with
reference to the attached drawings.
The dome-shaped speaker 1 according to the present invention includes a holding portion 2 of a
magnetic circuit having a cylindrical shape as shown in FIG. 1, a frame 3 formed continuously
with the upper end opening of the holding portion 2, and the holding portion. 2 comprises a thin
dome-shaped diaphragm 4 provided with the outer peripheral edge thereof connected to the
inner peripheral edge of the frame 3 above, and the holding portion 2, the frame 3 and the
diaphragm 4 are made of thermoplastic material It is integrally molded of polycarbonate.
In molding, the dome-shaped diaphragm 4 has a thickness of, for example, about 0.5 to 1.0 mm,
and a concave attachment portion 5 for adhesively fixing the upper end portion of the voice coil
to the center of the back surface. Are integrally formed.
Further, the cylindrical holding portion 2 for holding the magnetic circuit integrally forms
locking portions 2a and 2b which respectively project inward along the opening portions of the
upper end and the lower end, and the locking portion 2a. , 2b and the inner circumferential wall
2c is the holding portion of the magnetic circuit, and the inner diameter of the holding portion 2
is approximately the same size as the outer diameter of the magnetic circuit that matches the
diameter of the speaker to be obtained. It is
[0010]
In the dome-shaped speaker 1 having such a configuration, as shown in FIG. 2, an adhesive is
applied in advance to the concave mounting portion 5 formed on the back surface of the
diaphragm 4, and thereafter the tip of the voice coil 6 is mounted. After fixing, the ring-shaped
magnet 9 is fixed on the bottom plate 8 having the center pole 7, and the magnetic circuit
formed by fixing the top plate 10 on the magnet 9 has a space in a state where the holding
portion 2 is expanded. A is inserted into A, and the voice coil 6 is mounted in the magnetic gap of
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3
the magnetic circuit to form a dome-shaped speaker.
[0011]
The dome speaker according to the present invention comprises a cylindrical holding portion for
holding a magnetic circuit, a frame continuously provided at the upper end opening of the
holding portion, and an outer peripheral edge of the holding portion. Since the dome-shaped thin
diaphragm continuously connected to the inner peripheral edge of the frame is integrally formed
of a synthetic resin material, the process of adhesively fixing the outer peripheral edge of the
diaphragm to the frame may be omitted. In addition to the need for the diaphragm guide ring jig
used for attaching the diaphragm to the frame, the number of parts can be reduced, and the
production process of the dome-shaped speaker can be improved, and the cost can be reduced.
Have the advantage of being able to
[0012]
Further, the cylindrical holding portion for holding the magnetic circuit and the diaphragm
integrally molded with the frame are formed by attaching in advance a mounting portion for
mounting the voice coil on a predetermined portion of the back surface thereof. Since no coil
center positioning jig is required, the productivity of the dome-shaped speaker can be further
improved, and automation of the assembly process can be promoted.
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