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JPS4974927

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DESCRIPTION JPS4974927
November 77, 1984 · 1 patent director-director 宅 央-”" 豐 1 豐 V F Ft mage 1, the name of the
invention-Sveika JIIiml-board 4, agent 160 160 "--, I, · · · Nishi-Shinjuku 1-chome, No. 8-1 (Ori
Shige Building), Shinjuku-ku, Tokyo [Phase] Japan Patent Office @ Opening Date 49. (1974) 7.19
'Patent Application No. 1-E-15305 Application date H6 ear, (197)) ////, request for examination
not yet filed (total 4 pages). Description of the Invention Diaphragm for Speakers Title of the
Invention Diaphragm for Speakers
■ JP-A-49-74927
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm of a
speaker, and more particularly, to a diaphragm in which carbon fibers are mixed in a diaphragm
based on paper fibers, artificial fibers and the like. Conventionally, whiskers of alumina, carbon,
etc. are formed in advance in the shape of a speaker diaphragm by using a material having a very
large strength such as carbon fiber, and this is impregnated with a synthetic resin of excessive
corrosion, and completely crushed. Bonding to make a diaphragm is described in Japanese Patent
Publication No. 44 2914. Furthermore, as another example, whiskers are scooped and formed
into a paper shape, and this is bonded by electroplating or vacuum deposition, and means for
bonding by a diaphragm etc. is shown. Rainbow 0. As a result of repeating various experiments
about the case of using the diaphragm as a diaphragm for a large aperture instead of the metal
diaphragm as shown in this publication about the S-; However, it was found that the Young's
modulus decreases rapidly if the carbon fiber content is not properly selected by hardening with
an adhesive, pressing, etc. Therefore, the present invention uses carbon fiber whiskers to obtain a
Young's modulus. It is an object of the present invention to provide a speaker diaphragm suitable
for ume-ha and the like which does not cause a decrease in Hereinafter, the present invention
will be described in detail. In general, the physical properties required for the speaker diaphragm
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are that the Young's modulus is high, the density is low at 75 degrees, and the internal loss must
be uniform. It is known that the Young's modulus E is proportional to v <b> 2 between p) and 密
度, and the density 'p) is in the relationship of 1 oz B-alngp + c 」1 ・ (1). Here, a varies
depending on the type of fiber but has a value of 2 to 3. C is in the range of 1005-11. It has also
been experimentally confirmed that the internal loss decreases proportionally as the storage
increases between the internal loss -.delta.IEndPage: 1 and the density. Furthermore, the
hardness is expressed by E · work. Here, E is Young's modulus, ■ is BdJ // 12, B is the width of
the sample, d is the thickness of the sample, and depending on J, the bending hardness is the
cube of the thickness 9 if the same weight. It is better to reduce the density and make it thicker,
and in those where hardness is required, it is common to use a method such as non-press. As
mentioned above, it was contradictory to lower the density and increase the Young's modulus
and to increase the internal loss when using conventional materials, so there was a drawback
that the appropriate density, Young's modulus and internal loss are difficult to be overcome . The
present invention relates to a speaker loss and moving plate having the above-mentioned
drawbacks eliminated, and a moving plate containing a carbon rice crab which can have a high
Young's modulus and a high internal loss at the same density as a conventional mobile plate. I
can give it to you.
Next, physical properties of the present invention will be described. Pulverized bleached kraft
pulp is beaten by 1 o with tappy standard Niagara Peter t pulp, and Japanese Kokai 49-74927
(2) beaten to carbon free carbon edge line (5 to 10 111 fiber length) t-Table 1 According to the
weight ratio with the pulp (sounds) and mixed, according to the taraply standard sea) 8;-A test
sheet was made, and the density p, the gearing ratio and the internal loss-δ were measured by
the vibrational lead method. 0% 0, 377, 8 × 10 3.5 × 10 = 會 → 1010, 0.306. ! X 106.3 × 10 ·
201 G, 254, 6 × 1011.0 xl O 3016-0, 20−2, 5 × 1015, 0 × 10 = 40% 0.171, 3 × 1G 18.0 ×
10-ff1 (Table 1) Using the density and Young's modulus in the above table, the surface area
Weight ts. The bending hardness of the V case is calculated as shown in Table 2 below. -Carbon
fiber also has a bending hardness of 1 inch. 0'li'6X10 "10% l, IXIQ '20% 1.4 x 10' (h, L) ° These
results 1 and 2 are taken with conventional carbon fiber-free shooting shown in Figure 1 and
Figure 2 Compare the plate sample with the plate sample. Fig. 1 shows Young's modulus-E on the
vertical axis and density p on the horizontal axis. Fig. 22 is a graph superior by Hori and Ono,
given by log H = 1.94fogp + 10.6, as shown by the symbol (2) in the present invention. The
person is nine according to Ng's formula. 1 o 11 E = 2,240 ogp + 0.87 On the other hand, the
value shown in the above-mentioned Table 1 is plotted by a dot and dash line j rough indicated
by a symbol (3). It is understood from the graph of and n et al. That the Young's modulus in the
case of mixing carbon into the pulp material at about 5% to 35S and taking a large value as
compared with only wood pulp when the density is taken the same. In addition, since the internal
loss also tends to increase as the amount of carbon fiber contamination increases, it exhibits a
good tendency as a speaker diaphragm. Furthermore, taking the bending hardness on the vertical
axis and the density on the horizontal axis, and entering the above-mentioned calculated value,
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the curve shown in graph (4) of FIG. 2 is obtained. On the other hand, in the case of only wood
pulp, it is as shown by the curve M (5). Here, the relationship between the density and the carbon
fiber content is density Q, 3 g / s / and the carbon fiber content is 10%, 0.25 g / m 'f 20 To, and
30% at 0.2 g / J. From these, it is understood that the bending hardness can be increased by
inserting carbon fiber, and it is understood that a peak is shown by mixing of carbon fiber 20.
The present inventor is based on the above sample as shown in the following example. As a result
of producing a mobile board and measuring its frequency characteristics, high-harmonic
distortion was greatly improved as compared with the conventional wood pulp-only speaker, and
it was possible to obtain excellent reproduced sound in bass.
Practical example 1 ° unbleached kraft pulp 80%, carbon 111 m 201 t-Niagara beater for 10
minutes, add 19 to the net and add 8: Measure the harmonic distortion characteristics of a
speaker made by the same method with 90% of craft and sheep 410 qh for comparison and
comparing the results of assembling and measuring the speaker without drying and 306B nonpress cone. EndPage: 2Rig, Rough) 9016 A characteristic (7 m) (7 m), which is a characteristic of
the wool 104, is a curve of the embodiment of the present invention.
Brief Description of the Drawings A curve diagram showing the density and Young's modulus in a
non-working piece of wood pulp only, FIG. 2 is a curve diagram showing the same bending
hardness and carbon fiber content as FIG. 1, FIG. 3 and FIG. The figure is a frequency
characteristic curve showing a comparison of the second and third harmonics of the conventional
loudspeaker diaphragm and the loudspeaker diaphragm of the present invention. (1), (2), (5), (6),
(6s) are the conventional curves, + 31. (4), (7 *), (7s) d The curves of the present invention are
shown. Patent applicant Nippon Columbia Co. Ltd. agent Ito dr I-,? 第 1st Motion of Tone f 恥 m1
第 3itit 畝 C / SEndPage: 3
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