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TECHNICAL FIELD The present invention relates to a method of manufacturing a speaker
diaphragm used mainly for a speaker incorporated in an audio device. Prior Art A speaker
diaphragm made of mixed mica paper is developed and produced in the past, but both specific
modulus (Young's modulus / specific gravity) and internal loss (tan δ) required as a speaker
diaphragm None of them satisfied the physical properties. In the past, a method was used in
which a thermosetting resin such as an epoxy resin is impregnated in a diaphragm made of dried
100% mica papermaking material and then heat-dried, and pulp and a binder with relatively high
aspect ratio of mica paper. The mixture was mixed and passed through means such as paper
making and heating press to obtain a speaker diaphragm. Table 1 compares the physical
characteristics of the speaker diaphragm 1 of the present invention and the conventional speaker
diaphragms Nn2 to NQ4. Speaker diaphragm for 隘 2 is 50% (weight ratio) of 50% mica
composite (weight ratio) with an average aspect ratio of 250 and pulp material, mixed with 50%
(weight ratio) of N, UKP, and freeness 5R (weight ratio), heat-press dried, The epoxy resin having
a molecular weight of 380 and having good permeability is 10% impregnated with respect to the
total weight and heat treated. rI! : I3 is mixed with Nn 2 assembled mica and pulp at a weight
ratio of 50% each and blended with an anionic resin of polyacrylamide type 2% relative to the
total mass of assembled mica and pulp as a paper strengthening agent to aluminum sulfate Have
become established. ARASHI 4 is a non-bleached kraft pulp (N, UKP) of softwood and an equal
amount of a paper strength enhancer and a pinder at a degree of beating of 5 R 20 degrees
mixed with the same amount as the other 2 and heat-pressed after papermaking. 4 is a
diaphragm of 100% assembled mica with an average aspect ratio of 250, impregnated with 10%
based on the total weight of a highly permeable epoxy resin having a molecular weight of 380,
and heat-treated. In terms of specific elastic modulus and internal loss in Table 1, Nb 2. Since
N13 uses epoxy with a low molecular weight, the epoxy resin penetrates and hardens the entire
diaphragm and bond strength increases, so the specific elastic modulus is improved but the
internal loss is lowered, which is disadvantageous in terms of distortion factor It is a diaphragm.
Problems to be Solved by the Invention As described above, in the conventional method for
manufacturing a diaphragm for a speaker, a product having a high specific modulus and an
internal loss can not be obtained, and in particular, it is a ratio to mix mica and paper as an
enhancer. Although it is effective to improve the elastic modulus, it is difficult to maintain the
internal loss inherent to pulp. An object of the present invention is to provide a stable speaker
diaphragm that has such a conventional defect and is excellent in specific elastic modulus and
large in internal loss.
Means for Solving the Problems As a method for solving the above problems, the present
invention mixes mica with a pulp having a relatively high aspect ratio, and then maintains the
high internal loss of the pulp. The mechanical strength of the skin portion is improved as much
as possible, and the central portion in the thickness direction of the speaker diaphragm is made
smaller in bonding strength with pulp and mica to give an internal loss of 1. Operation According
to the above method, it is possible to provide a speaker diaphragm of stable characteristics
having a sufficient internal loss. EXAMPLES Examples of the present invention will be described
below. That is, according to the present invention, an aspect ratio of 100 to 400 of the laminated
mica is mixed with paper pulp and dried by a heating press, then impregnated with an epoxy
resin having a molecular weight of 1000 to 2000, and dried to obtain corn as shown in FIG. The
free diaphragm 2 is formed by attaching the free edge 2 to the peripheral portion of the speaker
diaphragm. Next, a specific example of the present invention will be described. Pulp: N, UKP 50%
(weight percent) Mica: average aspect ratio 250 (100 to 400) 50% (weight percent) Direct dye:
3% (relative to the total weight of pulp and mica) Fixing agent: sulfuric acid Aluminum 3% (with
respect to the total weight of pulp and mica) Epoxy resin: Molecular weight 1000 (MEK diluted
15% solvent) As described above, the present invention improves the specific elastic modulus and
does not impair the internal loss. The shape of the diaphragm is obtained by compounding paper
with mica with a high aspect ratio, press molding, drying, etc., and the viscosity of the epoxy
resin itself is increased by impregnating the epoxy resin with a high molecular weight, so that the
diaphragm is made. As a result, it becomes difficult to penetrate into the gaps between the
assembled mica and pulp fibers, and as a result, particularly the skin portions 1a and 1b as
shown in FIG. The central portion 1c of the diaphragm is impregnated with a very small amount
of epoxy resin, and the skin portions 1a and 1b constitute a composite material having a high
elastic modulus, and the central portion 1c has characteristics of high loss pulp base material It
becomes the composition which maintained Storm 1 in Table 1 shows the specific modulus and
internal loss of the embodiment of the present invention. As shown by the frequency
characteristic of FIG. 3 a, a flat with a small amount of peak dip and an extended performance of
the high band limit was obtained. b is the conventional molecular weight (Table 1. Material and
manufacturing method of N12) The frequency characteristic of the diaphragm for a speaker
impregnated with the epoxy resin of 380 is shown. Effects of the Invention As described above,
the present invention mixes a large amount of mica with a high aspect ratio into pulp and cures it
with an epoxy resin having a molecular weight of 1000 or more with low permeability, thereby
significantly enhancing the frequency characteristics (sound quality) of the speaker. Can be
Brief description of the drawings
FIG. 1 is a cross-sectional view of a speaker diaphragm manufactured by the method for
manufacturing a speaker diaphragm according to an embodiment of the present invention, FIG. 2
is an enlarged cross-sectional view of the relevant part, and FIG. It is a frequency characteristic
view of the speaker using the diaphragm for speakers of.
1... Speaker diaphragm, 1a, 1b...
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