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The ultrasonic transducer configured as described above performs the same operation function
as that described in FIG. 1A, but in the present embodiment, the lower electrode 8 is formed by
the 7-etching method. It can be easily formed in the same dimension as the width of the concave
lens 2, and its alignment is also versed. That is, since the formation position of the concave lens,
the formation position of one of the electrodes, and the dimension can be simultaneously formed
at the same level as that of the ankles, the output loss can be made close to zero in the case of
ultrasonic missing. . According to the experiment, the lower part was a position shift of the pole
with respect to the concave lens and the loss due to the thick n did not exceed 1 dE. As apparent
from the above description, according to the present invention, an ultrasonic transducer using a
ZnO thin film with small ultrasonic power loss is obtained, and its electrode formation is easy. .
4, a brief description of the drawing ,? 1 is the traditional zt * o? FIG. 2 is a schematic
longitudinal sectional side view of a transducer for an acoustic microscope using a II film, and
FIG. 2 is a schematic longitudinal sectional side view of a transducer for an acoustic microscope
using a zlIO thin film showing an embodiment of the present invention. FIG. 1: Support base 2 иии
Concave lens 4 и и ZnO thin film 6 иии Lead wire 8 Lower electrode 9 и и Upper electrode 1 Fig.
EndPage: 1 Generally beaten in a range of C 8 F 5500 'to 600 CC. And a high repulsion degree
contributes to the improvement of the output sound pressure frequency characteristic. However,
as a matter of course, the manufacturing time of the diaphragm is prolonged and the productivity
is impaired. In general, in the case of a speaker diaphragm, lightness, rigidity and internal loss
are mutually contradictory factors, and it is difficult to obtain an excellent diaphragm that
satisfies all of the above manufacturing methods. In this case, the generated diaphragm is coated
or impregnated with an organic solvent solution of a synthetic resin such as styrene-butadiene
rubber, urethane resin or the like with a lacquer such as nitrifying cotton lacquer to improve the
characteristics of the speaker cone diaphragm such as reinforcement and moisture resistance.
Sometimes. However, when impregnating or painting the above-described coating agent on
speaker cone paper, in any case, a considerable amount of resin penetrates into the fibers of the
speaker cone paper to inhibit the texture of the fibers. The requirement was to reduce the
internal loss. This naturally brings about complicated peaks and dips in the middle and high
frequency range due to the frequency characteristics of the speaker, which adversely affects the
sound quality. In addition, since the amount of resin coating on speaker cone paper is large, the
weight of the vibration system is increased to adversely affect transient characteristics and
efficiency. On the other hand, there are also problems of flammability and toxicity due to organic
solvents. As a result of intensive investigations, the present inventors previously adjusted an
ethylene-based vinyl water dispersion polymer emulsion containing nitrification cotton to an
appropriate viscosity, dried nine ones, and coated nine speaker cone papers as a result of
intensive studies. It is found that strengthening and moisture proofing of cis-beaker cone paper is
performed extremely effectively by the method of coating or applying to the pre-embossed pulp
deposit, and the influence on the characteristics of the speaker is also very good. Patent
application (Japanese Patent Application No. 54-113692), but as a result of further research, the
above-mentioned nitrified cotton-containing ethylene-based vinyl water dispersion polymer
alegeon is added to the pulp in the heater, and paper making, molding and drying are performed.
As a result, a speaker cone paper having further excellent performance can be obtained, and it is
found out that the present invention also makes it possible to shorten the beating time of the
That is, the present invention comprises 10 to 100 parts by weight of polymer and 10 to 50
parts by weight of nitrified cotton and 90 to 50 parts by weight of ethylene vinyl 1 combination,
and the above polymer monomer is dissolved with nitrifying cotton and then dissolved in water.
After the addition of the nitrification cotton-containing emulsion obtained by dispersing it in the
form of an oil and polymerizing the monomer to the pulp in the beater, the paper is formed,
molded and dried in the shape of a cone-shaped diaphragm. The present invention provides a
method for producing speaker cone paper characterized by According to the present invention,
as described above, a nitrifying cotton-containing aqueous emulsion is added into a beater,
formed into a sheet, and heat-dried, whereby the resin adsorbed to the pulp is fused to improve
the bond strength between fibers. Therefore, even if the beating time is shortened, the strength
of the finished diaphragm can be sufficiently obtained. In addition, the fusion of the resin blocks
the air permeability of the diaphragm and contributes to the improvement of the sound quality.
However, the desired effect of the present invention can not be obtained unless the resin
containing a nitrifying cotton specified in the present invention is used as the resin. For example,
polymer emulsions of vinyl acetate type, vinylidene chloride type, acrylic type, etc. are
incompatible with heat blocking resistance and flexibility, so for speakers that require drying by
heating and pressing at high temperature in the final step The diaphragm can not be made into a
sheet of the desired properties by addition in the beater. On the other hand, since the emulsion of
the present invention contains a natural cell p-s derivative, it has good compatibility with the
pulp and gives favorable results in terms of sound quality, and the above-mentioned conventional
synthetic resin emulsion is used. There is no defect 0. Furthermore, when using the nitrification
cotton-containing aqueous emulsion of the present invention, the addition amount to the pulp in
the beater and the nitrification cotton content and J / (speaker obtained by adjusting the
viscosity of the emulsion The rigidity and internal loss of cone paper (diaphragm for speaker) can
be controlled appropriately. EndPage: 2 specification 1, title of the invention
Speaker cone paper manufacturing method
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
making speaker cone paper. More specifically, a pulp slurry prepared by adding an ethylenebased vinyl water dispersion polymer emulsion containing nitrification cotton to a pulp in a
beater is made into a sheet, molded and dried to make the speaker cone paper lightweight, rigid
and internal loss. The present invention relates to a method of manufacturing speaker cone
paper which controls air permeability and interrupts air permeability to give a good output
sound pressure frequency. Loudspeakers are electro-acoustic transducers designed to radiate
into the air acoustic power in the form of acoustic waves that are essentially coextensive with the
waveform of the electrical input, and are generally used for direct radiation speakers and horn
speakers. Two types are used. In the present invention, a cone-shaped diaphragm coupled to the
voice coil of the direct radiation speaker is referred to as a speaker cone, and almost all the
speaker cones are made of paper. Such a speaker diaphragm is required to be soft and rigid in
order to improve its output sound pressure frequency characteristic, distortion characteristic and
strength, and to have a proper internal loss. In order to obtain such a diaphragm, conventionally,
natural cellulose or man-made fibers of wood pulp have been beaten with a beater, then formed
into a cone shape, and formed and dried by non-press or press to complete. The relationship
between the beating time of the pulp and the tensile strength and the bending resistance is
positively correlated, and in the case of the speaker diaphragm, a solution consisting of EndPage:
potassium triate 0.41F was initially added at 28.5 W. The reaction starts and temperature is kept
at 65 ░ C for 60 minutes from the end of the exotherm, then add the rest of the above
potassium persulfate aqueous solution, distilled water 52, sodium bisulfite 0.08F, and make the
temperature 80 ░ C. Raise, and ii! Maintained for 90 minutes at a time. As a result, a 45% solids
urine dispersion polymer body fluid was obtained with pI (6, 7, viscosity 14 cps (BL type
viscometer, rotor 41.60 rpmi 30 ░ C.). 15 parts of butyl cellosolve acetate (hereinafter
abbreviated as BCeA) was added to 100 parts of this water-dispersed polymer solution and
thoroughly mixed to obtain a nitrified cotton-vinyl polymer emulsion of the present invention
having a viscosity of 5QOcps. The above emulsion (concentration 45 wt., Viscosity 300 cps) is
added to a pulp aqueous solution with a freeness of CFS 450 QC so as to be 30 wt% or less of the
total solid content of the base, and the pulp is beaten in a beater. At this time, ferrous sulfate is
mixed with the pulp in o, 5zls to fix the resin sufficiently on the pulp.
The pulp slurry thus obtained is formed into a paper net by a conventional method, then formed
into a speaker cone paper shape, heat-pressed at a temperature of 120 ░ C., a pressure of 50 to
70, and molded, and dried I obtained the desired diaphragm for the speaker. Approximately 50 f
/ y of commercial lacquer paint conventionally used directly on speaker cone paper (treated with
aluminum sulfate) prepared in the usual way for comparison! It spray-coated by (solid content
conversion) and dried. The frequency characteristics of a 25 m full range speaker were measured
with a BrЧel Care instrument using each of the obtained speaker cones (1 W). Measured with 1
input). The results are shown in FIG. That is, according to the present invention, the strength of
the speaker cone paper is sufficient, the distortion of the output sound pressure level in the
middle to high range (especially 1.4 to 20 KHz) (the level of the output sound pressure level) is
extremely small and the transient characteristics are good As a result, it has been demonstrated
that the high-level speaker sounds 4ii 4 IlF sex. On the other hand, in the case of the
conventional lacquer paint, the strength of the speaker cone paper is insufficient and the
transient characteristics are inferior, unnecessary peaks in the middle and high range are not
suppressed, the sound quality is inferior, and the propagation characteristics are unsatisfactory.
0 found
4. Brief description of the drawings. FIG. 1 is a graph showing the frequency characteristics of
the speaker cone paper obtained in the examples of the present invention and comparative
examples. The solid line shows an example and the dotted line shows a comparative example.
Chemical Industry Co., Ltd. Atsushi Furuya EndPage: 5 Warning: Page Discontinuity
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