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JPH0677395

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DESCRIPTION JPH0677395
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a speaker
for use in an active noise reduction device that reduces noise by producing sound in phase
opposite to that of noise, which is used in high temperature atmospheres. It relates to the
speaker for.
[0002]
2. Description of the Related Art In a conventional sound muffling speaker designed to endure
this kind of high temperature, the publication of Japanese Patent Laid-Open No. 4-186998
"Speaker unit for high temperature" shown in FIG. As shown in FIG. 3, there is a structure in
which a conical diaphragm 8 made of paper, a voice coil bobbin 7 and a dust cap 9 are
respectively bonded with an adhesive.
[0003]
[0003] Conventionally, this type of muffling speaker is attached to a narrow area with a very
high sound pressure level of the ventilation sound, such as the inside of a ventilation duct with
high muffling effect, and the reverse of the sound pressure of the exhaust sound Since sound
pressure is generated and sound pressure interference is performed to mute the sound,
therefore, conventional speakers are used under overload conditions under extremely severe
environmental conditions and are exposed to the high temperature of the air duct. The vibrating
member itself such as the diaphragm 8 and the dust cap 9 as shown in FIG. 5 and their
respective joints will be further subjected to severe conditions.
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[0004]
Therefore, the diaphragm 8, the edge portion, the dust cap 9, or the voice coil bobbin 7 may be
deformed or the adhesive for bonding them may be softened to peel off the adhesion and cause
each member to be disassembled. Where there is a need for an immediate solution
[0005]
Therefore, in the above-mentioned conventional high-temperature speaker of this type, the
diaphragm 8 and the voice coil bobbin 7 or the diaphragm 8 and the dust-capping 9 are used in
the speaker assembly process. And the joint is loosened in order to be exposed to vibration or
high temperature, and in the extreme case, the paper diaphragm 8 and the corrugation edge
portion or the diaphragm 8 are used. There is also a problem that the dust cap 9 is separated and
decomposed.
[0006]
Therefore, in order to solve the problems which such a conventional high temperature speaker
had, the present invention, as shown in FIGS. 1 to 4, in the speaker assembly preliminary step,
the diaphragm (1) and Enhancement of heat resistance by joining together the corrugation edge
(1a) or the dust cap (3) at their junctions with the yarn (5) having high heat resistance in a
circumferential shape. An object of the present invention is to provide a speaker for high
temperature which can realize the easiness of assembly with the aim of precision improvement,
improvement of quality and economy, and prolongation of life.
The configuration of the present invention for achieving the object will be described with
reference to FIGS. 1 to 4 corresponding to the embodiments. 1) A joint portion between the
corrugation edge portion (1a) or the dust cap (3) is integrally formed with a heat-resistant yarn
(5) such as an inorganic fiber such as polymetaphenylene isophthalamide resin fiber or glass
fiber Is a high temperature speaker sewn to
[0007]
[Function] The speaker for high temperature according to the present invention has such a
structure, so that it can be simply processed by simply sewing together with the heat resistant
thread (5) in the preliminary processing step. The conventional speaker assembly line can be
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2
used as it is without any special skill.
As a result, it is possible not only to improve the cost, but also to improve the heat resistance, the
quality and the life of the speaker without raising the speaker manufacturing cost at all.
[0008]
Embodiments of the present invention will be described with reference to the drawings.
In the drawings, FIG. 1 and FIG. 2 show an embodiment of the present invention, and FIG. 1 is a
glass fiber woven fabric impregnated with .gamma.-aminopropyltriethoxysilane, and after airdrying, it has high heat resistance. The material is impregnated with an epoxy resin containing
methylene tetrahydrophthalic anhydride as a curing agent, heated and dried at 200 ° C. for 60
minutes, molded into a diaphragm shape, and then cured by heating at 200 ° C. for 60 minutes.
The heat-resistant epoxy resin is diluted with toluene in a woven fabric comprising a peripheral
portion of a conical diaphragm (1) having a deformation temperature of about 190 ° C. and
polymetaphenylene isophthalamide resin fibers and having an opening ratio of about 70% (20
%), Air-dried, and then heat-dried at 150 ° C. for 2 hours to form a corrugation edge (1a) formed
of a material into a predetermined shape, and a sewing machine comprising polymetaphenylene
isophthalamide resin fiber (5) to chosen circumferentially speaker hot sutured together
[0009]
It is to be noted that, in the present invention, in the joint portion connected circumferentially
and integrally sewn with the heat-resistant yarn (5) described above, the auxiliary adhesion by
the adhesive is applied to the base as the preliminary processing. It does not interfere with the
implementation of
The material of the diaphragm and dust cap may be made of a material made by impregnating
paper with a heat resistant non-combustible resin, metal, synthetic resin or any mixture thereof.
Needless to say.
[0010]
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Although the embodiments considered to be representative of the present invention have been
described above, the present invention is not necessarily limited to only the structure of these
embodiments, and includes the above-mentioned components according to the present invention,
and In order to achieve the purpose of the present invention, the present invention can be
appropriately modified and implemented within the scope having the following effects.
[0011]
As already apparent from the above description, the high temperature speaker of the present
invention is configured as described above, and the heat resistance and mechanical strength are
remarkably increased by the suturing with the heat resistant thread (5). Be strengthened.
In the 180 ° C. exposure test of the diaphragm of the example, the mechanical strength
deterioration after 1000 hours had stopped at about 5%.
[0012]
Therefore, the deformation due to heat can be prevented, and the quality and the life can be
improved. Also, in the speaker assembly preliminary processing, the conventional speaker is
assembled by a simple processing in which the diaphragm (1) and the corrugation edge portion
(1a) are sewn together integrally with the heat resistant thread (5) by the sewing device. The line
can be used as it is and assembled without requiring any special skills, simplification of the
assembly process and easiness of assembly can be realized, and soaring cost of the speaker
production is small, and so on. As it has a remarkable effect that can not be expected
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