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JPS516920

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DESCRIPTION JPS516920
DETAILED DESCRIPTION OF THE INVENTION This invention relates to acoustic devices, and in
particular to diaphragms for acoustic devices suitable for use in loudspeakers and microphones.
Conventionally, a cloth impregnated with a phenol resin or a duralumin foil is mainly used as a
diaphragm for an audio device, but a cloth impregnated with a phenol resin easily absorbs
moisture and is inferior in dimensional stability and durability. Duralmin foils do not absorb
moisture and have excellent dimensional stability, but they are susceptible to corrosion over
time, and are particularly susceptible to corrosion due to salt, making them unsuitable for use
near shores, (1) In addition, since heat treatment after molding requires surface treatment after
molding, it has a disadvantage that the molding operation takes time and the like. Furthermore,
in the conventional diaphragm, abnormal vibration may partially occur to generate distorted
sound, and the dome-like portion is worn out and damaged while repeating the vibration. For this
reason, there has been a demand for diaphragms for acoustic devices that are excellent in
dimensional stability, corrosion resistance, and durability, and that can be easily formed without
generating distortion sound due to abnormal vibration, from the time of the second letter
addition. The In this device, in view of the above-mentioned points, the film made of polyimide
resin is tough, excellent in dimensional stability, corrosion resistance, heat resistance and cold
resistance, resistance to water, sunlight and the like, and extremely thin. Even if it is in the shape
of a metal foil, it is made with a focus on the fact that it can be molded in a simple step of heating
and embossing, and it is made of polyimide resin film. By heating and embossing to form a dome
shape, and providing an uneven portion or rib for reinforcement (2) on the dome-like portion
using a suitable mold having the uneven portion, partial abnormal vibration An object of the
present invention is to provide a diaphragm for an audio device which has good frequency
characteristics while preventing occurrence of distortion sound. The configuration of this
invention will be described below based on an embodiment shown in the drawings. The
diaphragm for an acoustic device according to the present invention is a polyimide resin which is
a condensation polymer of, for example, an aromatic tetrabasic acid such as pyromellitic
anhydride and an aromatic diamine such as 4,4'-diaminodiphenyl ether. The film obtained by film
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forming processing is heated and embossed to form a dome-shaped portion 1, a damper 2
continuously provided on the outer periphery of the dome-shaped portion 1, and a dome-shaped
portion as shown in FIGS. It is formed into a diaphragm having an uneven portion 3 provided
radially about the top of 1.
The uneven portion 6 is formed simultaneously with the formation of the dome-like portion 1 by
using a male and female mold provided with the uneven portion. In addition, as shown in FIG. 6,
the concavo-convex part 3 is formed as a convex part 3a protruding outward, or as shown in FIG.
4 as a concave part 6b as viewed from the outside (3). Also, the convex portions 6a and the
concave portions 3b may be alternately combined and provided. Furthermore, as shown in FIG. 5,
a rib 4a may be provided on the outside of the dome-shaped portion 1, or a rib 4b may be
provided on the inside of the dome-shaped portion 1 as shown in FIG. Of course, also in this case,
the ribs 4a and 4b may be provided alternately in combination. Further, as shown in FIG. 7, the
damper 2 may be provided with the uneven portion 5. The uneven portion 3 or the rib is not
necessarily extended to the bottom of the dome 1 and may be stopped at the side of the dome 1
as shown in FIG. The number of concavo-convex parts 6 or ribs provided in the dome-like part 1
can be changed appropriately, and as shown in FIG. 9, the dome-like part 1 should be sufficiently
reinforced even if the number of concavo-convex parts 3 or ribs is four. Can. In addition, a
corrugated part may be provided in the tamper-2 of the diaphragm shown in FIG. 8 and FIG. At
first, one example of the method of forming the diaphragm of the present invention will be
described. First, a polyimide resin film is heated to a temperature close to softening by heating
with a suitable heating means (4) to soften it, Forming a softened film with a female mold having
a mold and a male mold substantially similar to the female mold and having a convex portion or
a concave portion on the outer surface while forming a dome or a concave portion or a convex
portion at the same time as the dome shape; After curing the film, open the mold and take out
the diaphragm. In addition, also when providing a rib instead of an uneven part, a rib can be
formed simultaneously with shaping | molding of a dome-shaped part using a metal mold | die. In
some cases, it is also possible to provide the ribs by bonding with an adhesive. Finally, one
embodiment of the present invention will be described. A 125 μm thick polyimide resin film is
heated and embossed to obtain a diaphragm having an uneven portion in the dome-like portion.
By bonding a bobbin in which a Heus coil is wound to this diaphragm and attaching it to a
loudspeaker, distortion noise due to partial abnormal vibration with little aging is prevented
without being affected by temperature and humidity. Also, even if vibration is repeated over a
long period of time, the diaphragm does not deform or break, and a loudspeaker having excellent
characteristics can be obtained. (5) As described above, the diaphragm for audio equipment of
this invention is formed of a polyimide resin film which is strong and excellent in mechanical
strength and excellent in dimensional stability, thermal stability and chemical resistance. As a
result, it has an excellent effect of being less susceptible to aging without being affected by
temperature, humidity and the like.
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In addition, since the dome-shaped portion is provided with the concavo-convex portion or rib,
the dome-shaped portion is reinforced so that abnormal vibration does not partially occur as in
the conventional diaphragm and distortion sound is generated, and the vibration is long There is
no risk of deformation or breakage even after repeated periods. Further, when the diaphragm of
the present invention is attached to an acoustic device, in addition to the various effects
described above, an acoustic device having excellent frequency characteristics can be obtained.
When a bobbin wound with a voice coil is attached to a diaphragm, the diaphragm and the
bobbin are bonded via an adhesive, heated to a certain temperature, and firmly bonded, or a
cloth impregnated with a phenol resin. In such a conventional diaphragm, the diaphragm is
deformed due to heating, and it takes time to attach the bobbin to the diaphragm. However, the
polyimide resin film has high heat resistance (6) or larger Since the adhesion of the agent is
excellent, the bonding operation between the diaphragm and the hobin can be easily performed.
Furthermore, as in the case of the conventional diaphragm, it is not necessary to perform
operations such as impregnating a cloth with a phenolic resin, and operations such as surface
treatment after heat treatment molding of duralmin foil, and to form an acid film with a constant
thickness. It has an effect that the diaphragm can be manufactured only by a simple operation of
heating and embossing the resin film, and therefore mass production is possible, and an
inexpensive diaphragm can be provided. It has various excellent effects.
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