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The present invention relates to a loudspeaker diaphragm having excellent frequency
characteristics, in particular, a flat diaphragm for loudspeakers (2). In comparison with domeshaped, cone-shaped, and horn-shaped loudspeakers, two-fold diaphragms, the flat diaphragm
performs 1) piston motion. 2) There is no distortion of sound because air load is uniformly
applied to the diaphragm. 3) If the aperture of the diaphragm is the same, there is an advantage
that the low frequency range is expanded and the audio frequency without distortion is possible,
etc., but 1) divided vibration is likely to occur 2) flat diaphragm , The rigidity 2 strength more
than curved 9 conical diaphragm is necessary. 3) It has a defect such as being susceptible to an
edge and does not lead to the superiority of the above-mentioned flat diaphragm with various
conventional developed materials, ie, conventional aluminum and titanium. A sandwich of carbon
fiber polymer material etc. is proposed in metal foil such as pellicula etc. (A rigid laminated
diaphragm etc. has been proposed, but rigidity is improved, but since metal foil is used,
resonance sharpness Q is high, internal loss Because it is small. There is a defect such as
disturbance of resonance 9 frequency characteristics in high frequency range, and various kinds
of hard pulp are made into a suitable fibrillated and fibrillated surface on inorganic fibers such as
alumina and silicon nitride 9 asbestos, etc. Attempts have been made to improve such as coating
with various polymer materials, but there are many problems such as insufficient strength, small
internal loss, and two-part vibration as it goes high. Increasing the internal loss of the speaker's
diaphragm is an essential requirement to prevent diaphragm division resonance and improve the
sound pressure frequency characteristics of the speaker EndPage: 1, but the one with a large
internal loss is insufficient in stiffness, ie There is a contradictory relationship such as a lack of
strength as a diaphragm, and a speaker with good sound quality with excellent frequency
characteristics has not yet appeared that satisfies both of the two characteristics. The present
invention is to provide a ceramic flat diaphragm for a speaker, which has a suitable elasticity and
a large rigidity and has a large internal loss and a light weight and good performance from which
the defects of the prior art described above are removed. That is, according to the present
invention, a ceramic plate is sintered by using a ceramic particle as an aggregate, a diaphragm of
a dense structure bonded and molded with a hard rubber or a polymer compound of resins, and
further sintering the ceramic particle. A diaphragm made by impregnating the pores of the
ceramic sintered body with a polymer compound of a resin to form a dense structure and having
extremely high rigidity ceramic particles made of a hard rubber or a polymer compound such as
a resin. By strengthening and cementing to increase strength, it is possible to provide a
lightweight and rigid diaphragm with a large internal loss, and high rigidity ceramics and a
polymer compound such as a hard rubber or a resin are combined to produce divided vibration.
A high-performance, high-quality speaker is possible, such as suppressing energy and attenuating
it so that an extremely flat output sound level frequency characteristic can be obtained.
The ceramic particles used in the present invention are, for example, materials preferably having
a true specific gravity of 4 or less such as alumina, silicon carbide, boron carbide, mullite or the
like and a hardness of 18,000 nub or more. When the specific gravity is 4 or more, the weight of
the diaphragm is increased, and the diaphragm can not withstand use. When the hardness is
18,000 or less, the rigidity of the diaphragm is insufficient, which is not preferable. Father 2 is
used in the present invention. Hard rubber may be natural rubber or synthetic rubber. Natural
rubber and synthetic rubbers that are somewhat soft need to be mixed with an appropriate
amount of sulfur and cured. Further, in the case of a molding binder, for example, in the case of a
molding binder, thermosetting resins such as phenol resin, epoxy resin, urea resin, melamine
resin 9, powder, and the like are used. Thermoplastic resins such as vinyl chloride resin and vinyl
acetate resin 9, and other natural resins such as pine resin can be used. In addition, the
impregnating agent for the ceramic sintered body may be an epoxy resin, a phenol resin, or an
alcohol solution of powder resin of the above-mentioned molding binder, a carbon disulfide
solution, or any other suitable solvent to dissolve it. Impregnate. Next, an embodiment of the
present invention will be described. Ceramic molded article (planar diaphragm) Example 1)
Alumina (Al * "*) particles (particle size 80 μ) 80 Wt x Nitrile rubber 14 Wt x 6 wt% sulfur using
a roll machine to make the rubber completely uniform in the pores between alumina particles
The strands are mixed to a degree that they can be filled into sheets After being molded and cut
into a predetermined shape with a mold, it is dried by heating and cured in a drying oven at
about 180 ° C. Properties of Example 1) Bulk Specific Gravity 2.7 Hardness, Rockwell Scale / l /
70 Product Dimensions 69.8 X # x Thickness 0.45% Product Weight 4.65 gr Example 2) Silicon
Carbide (stc) Particles (Sc) Particle size aox) Sowtx butyl rubber 12 wt. X 9 wt. Sulfur are
produced as described in Example 1). Example 2) Bulk specific gravity 2.3 hardness Rockfell
scale 72 product size 69.8 XOX thickness 0.45% product free time 3.96 gr ceramic sintered body
(planar diaphragm) Example 3) alumina (AI) , O,) Particles (particle size 25μ) 85 wt% powder
vitreous binder Powdered product name Vitrified 15WtX is wet mixed with a sizing agent of 30X
dextrin aqueous solution and then uniformly mixed. After press-molding and drying with a
predetermined mold, in a baking furnace. Sinter-harden. Thereafter, the sinter is grooved in a
rubber-modified epoxy resin solution, impregnated into the pores of the sinter, and dried and
cured in a drying oven at about 180 ° C.
Properties of Example 3) Bulk specific gravity λ5 hardness, Rockwell R scale 76 Product
dimensions 69. Product weight 5.75 grEndPage: 2 Example 4) Silicon carbide (5 ic) particles
(particle size 30 p) 9 ow t% 10 wt% powder glass binder are produced in the same manner as
described in Example 3) Do. Properties of Example 4) Bulk specific gravity 2.1 hardness,
Rockwell scale 78 product dimensions 69.8% ω × thickness 0.6% product weight J or 4.82 gr
Using the flat diaphragm of the embodiment described above As a result of making a speaker and
listening as a result of audition, there is no divided vibration and the drive of the voice coil (;
faithful vibration is obtained. It has been demonstrated that it has extremely flat sound pressure
frequency characteristics. The example which calculated | required the sound pressure frequency
characteristic of the diaphragm of Example 1) of this invention and 3) is a figure. The present
invention has been described in detail with regard to a flat diaphragm in particular, but it can
also be applied and applied to a dome-shaped diaphragm 2 conical diaphragm and others.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the sound pressure frequency
characteristics of the diaphragm of the first embodiment 3) of the present invention. The solid
line is the diaphragm of the third embodiment. The dotted line represents the diaphragm of
Example 1). Applicant Aiko Inc. EndPage: 3
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