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JPS5763996

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DESCRIPTION JPS5763996
Description 1 Title of Invention
Flat-type speaker diaphragm and method of manufacturing the same
3. Detailed Description of the Invention The present invention relates to a flat type speaker
diaphragm and a method of manufacturing the same, and in particular, it is light and rigid using
a ceramic material (Yurasumi, Tsuku or The present invention relates to a laminated flat
diaphragm for loudspeakers which does not occur and a method of manufacturing the same. A
conventional sway force is a vibration EndPage: 1 plate which transmits the generated sound
vibration, and a cone-like cone speaker of a Sishen face type has become common under various
conditions. The reason for this is that it withstands the strength of vibration and is lightweight,
and devices of shape, material, etc. have been devised. However, particularly as a low-pitched
speaker, a speaker having a large vibration area is required, and since the output has recently
become larger and more and more, the problem of the generated sound quality is the separation
of the sound (split resonance) and the phase shift. Is taken up. In a cone speaker, the phase shift
is not essentially solved from the structure at. For this reason, recently, a flat type speaker in
which the front surface of the speaker is formed of a flat plate has appeared. In this case, the
sound wave spreads on the front of the speaker as a plane wave, and the phase shift disappears.
The diaphragm of this flat type speaker withstands the vibration pressure of the speaker, there is
no refraction to vibration, and the lightness which is the basic east condition of the speaker
diaphragm is satisfied. The absence of refraction with respect to vibration is an important
condition for further improvement in sound quality without occurrence of split resonance. The
present invention has been made to satisfy all the above conditions, and is a flat surface which is
light in weight, excellent in strength and rigidity, and does not cause problems such as split
resonance, phase shift or adhesion which is a defect of the conventional speaker diaphragm. It is
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an object of the present invention to provide an imaging plate and a method for manufacturing
the same. The inventors of the present invention have found that a flat type speaker diaphragm
made of a ceramic or glass ceramic material satisfies the above purpose, as a result of earnest
studies in line with the above purpose. That is, the diaphragm for a speaker according to the
present invention has a porous ceramic body or a glass ceramic material of the same material as
the porous ceramic body or the porous glass ceramic body on both sides or one side of the
porous ceramic body or porous glass ceramic body. It is characterized in that an airtight thin
layer is provided, and the photofinishing board is excellent in frequency and rigidity etc. In the
present invention, cordierite and alumina are preferably used as the porous ceramic body or the
hermetic thin layer of the ceramic. In addition, the size of the porous ceramic body or the porous
glass ceramic body after firing is preferably in the range of 1 to 5 、, less than lim causes
difficulty in the gradient, and exceeding 5 mm t significantly reduces the acoustic effect, Each is
not preferable.
Furthermore, the thickness of the ceramic or glass ceramic airtight thin layer after firing is
preferably 0.1 to 0.3+, the thickness of tm is preferable, and if it is less than 0.1 mm, the strength
decreases, and if it exceeds 031 m The increase in weight causes problems in practical use and is
not preferable. The firing shrinkage of the alumina is about 12%, the cordierite is about 10%, and
the glass ceramic is about 10% by firing, so that the unfired porous ceramic in consideration of
the firing shrinkage. It is necessary to make total adjustments to the thickness of the body and
the thickness of the flexible notebook or the applied amount of the slurry. The method for
producing the flat speaker diaphragm of the present invention is as follows. j That is, powdery
raw material as ceramic manufacturing month? When used, this mixture is dispersed in water
etc. and at the same time some adhesive and dispersant are mixed to obtain a slurry (5), to which
a foam, eg foam? The unfired porous body 11 is obtained by immersing and pressing the
polyurethane / ton, PVA sponge, nylon, non-woven fabric, etc. and then drying. Separately, a
uniformly flexible notebook or slurry having the same ceramic composition as the porous body is
prepared. A flexible 7-like material is adhered to both sides or one side of the porous body thus
obtained with an organic or inorganic adhesive, or a slurry Th * Tfi of about 1200 to 1600 ° C.
And baking for 1 to 10 hours and further forming into a suitable shape, for example, a circular
shape to obtain a diaphragm. In the present invention, in the case of using a finely powdered
powder as a raw material for glass ceramics, the porous body is obtained by pressing and drying
in the same manner as the ceramic raw material to obtain an unfired porous body. By firing for a
time, a porous glass ceramic body is obtained. Separately, a flexible note-like material having the
same composition as that of the porous glass ceramic body is prepared and fired for five to two
hours at 1000 to 1300 ° C. to obtain a bitter thin (6) EndPage: 2 plate. The porous glass
ceramic body thus obtained and the airtight glass ceramic thin plate are coated with glass yeast
and adhered, and heat treatment is carried out at 600 to 1000 ° C. for 0.5 to 2 hours to obtain a
porous thin cover. The thickness of the above-mentioned porous body which is formed into a
desired shape and made into a diaphragm is 0 to 5 after firing, and also. It is necessary to
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prepare or apply a sample so that the thickness of the flexible sheet and the coating amount of
the slurry become 0.1 to 0.3 n after baking. Hereinafter, the present invention will be described
in detail by way of examples.
Example 1 In terms of weight, 94.0% of alumina, 20% of calcium carbonate, and 1. of magnesium
hydroxide. It is obtained by dispersing o% of clay in a fine powder mixture xoooy 'of 30 parts in
water 350 omega and simultaneously blending some adhesives and dispersants. Separately, a
flexible sheet having a thickness of 0.2 mm is produced so as to have the same ceramic
composition as the porous body. The unbaked porous body thus obtained is bonded to one side
of the flexible sheet with a vinyl acetate emulsion-based adhesive and fired at about 1600 ° C.
for 5 hours. The caustic porous body of the ceramic particles is integrated with an airtight nonporous thin layer on one side. This integrated product was lightweight and excellent in rigidity
and strength. The physical properties of this integrated product are shown in Table 1 in
comparison with a conventional paper cone. EXAMPLE 2 A kaolin, Merck, Alumina arch-zoerite
composition is prepared, and in the same manner as in Example 1, an unfired porous body
having a thickness of 411 L 1 L is formed. When applied to a thickness of the same quality
conoelite slip f 0.3 rnm on both sides and fired for 1 hour at 1280 ° C, the central part is
porous, and both sides are light and rigid consisting of an airtight thin layer An integrated sheet
is obtained. The physical properties are shown in Table 1. EXAMPLE 3 A finely powdered raw
material having a known composition of 56,0% Nrica, 20.0 Alumina, 15.01 magnesia, and 9.0%
titania to be a nucleation agent in terms of weight A slurry is prepared using 1oooy, and an
unfired porous body having a thickness of 5 is formed in the same manner as in Example 1, and
when fired at 1250 ° C. for 1 hour, it comprises conoelite and rutile as a crystalline phase. A
glass-ceramic porous glass-ceramic body is obtained. Separately, a flexible sheet of 0, 2 mru
having the same composition as this porous glass ceramic body is prepared and fired at 1250 °
C. for 1 hour to obtain an airtight thin plate. An airtight glass ceramic thin plate is coated on one
side of the porous glass ceramic body thus obtained and bonded to the glass, and heat treated at
about 800 ° C. to obtain an integrated thin plate in which the both are firmly bonded. The
physical properties are shown in Table 1. (9) (10) EndPage: 3 Example 4 When the integrated
thin plate obtained in Examples 1 to 3 is formed into a disk shape having a diameter of 2′2
cmIn and used as a diaphragm of a woofer, The sound from is well balanced y, the phase of the
sound is matched, the sound pressure is radiated constant up to the high range, and the
sharpness of the sound is further improved.
This is apparent from FIG. 3 which shows the sound wave frequency custom-made and distortion
characteristics when the integrated thin plate of Example 1 is formed into a diaphragm. The same
results were obtained for the diaphragms formed of the integrated thin plates of Example 2 and
Example 3 as well. As described above, the diaphragm of the present invention is reduced in
weight by the use of a porous ceramic body or a porous glass ceramic body, is excellent in
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rigidity and strength by lamination of an airtight thin layer portion, and is also divided resonance
When the imaging plate of the present invention is used, the phase shift is eliminated, and the
sound pressure is constantly radiated up to a high temperature range, and it is possible to further
improve the sound clarity without distortion. In addition, the problem of adhesion does not occur
as in the conventional flat diaphragm for speaker.
4. Brief description of the drawings FIGS. 1 and 2 are a schematic view and a cross-sectional
view, respectively, of a diaphragm of a flat loudspeaker according to the present invention, and
FIG. 3 is provided with a diaphragm of the flat loudspeaker according to the present invention. It
is an output sound pressure frequency characteristic figure and distortion characteristic figure of
aperture 22cIrL speaker. Is a ceramic or glass ceramic thin layer, 2 is a porous ceramic body or a
porous two-body part on the lath, 3 is a skeleton part of the porous body part, 4 is a porous part
The communicating pore portion is shown. Patent Assignee Japan Ceramics Co., Ltd. Attorney
Attorney Ito Tatsuo Tsubaki Yamashita Takuhei $ 111 Round 211 i! Joy ()-1z) EndPage: 4
procedure amendment November 5, 1959 Patent Secretary Commissioner Harada Shimada 1
display of the case Showa 55 patent application No. 139272 2 name of the invention 2 name of
the invention vibration of the flat type speaker Board and its manufacture 3 Relationships with
persons who make corrections Patent application Place of residence 1st chome, NoritakeShincho, Nishi-ku, Nagoya, Aichi Prefecture Name (429) Japan Ceramics Co., Ltd. Representative
Sugimoto Takumi part 4, agent 〒 105
Flat-type speaker diaphragm and method of manufacturing the same
Address Toranomon II, Minato-ku, Tokyo] No. 8 No. 1 Toranomon Electric Building Telephone
(501) 93707 In the target specification of the correction, "Detailed description of the invention
11: 8 contents of the correction specification page 11, line 17 Correct the "high temperature
range" to "one high range". EndPage: 5
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