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JPH01175399

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DESCRIPTION JPH01175399
[0001]
The present invention relates to a speaker diaphragm and a method of manufacturing the same.
(B) Prior Art In recent years, progress in WI # equipment making full use of digital technology
such as compact disc <CD) and digital audio tape (DAT) is remarkable, and along with that, even
more bass reproduction is required in -C speakers There is. However, in the case of an apparatus
such as a cassette tape recorder with a radio, it is simultaneously required to make the cabinet
smaller and thinner, and there is a problem that the body of the speaker 4 (vibration frequency
(ro) is significantly increased when the cabinet is mounted. Therefore, in order to increase the ffl
amount of the speaker diaphragm, it is also well known to attach a flat board to the diaphragm
(corn paper) to increase the equivalent mass (Japanese Utility Model Publication No. 59-18798 (
See HO 4 R 1/28)). However, in the speaker having the above-mentioned structure, there is a
possibility that the rolling phenomenon may occur due to the non-linear distortion and the
problem of weight distortion, and the number of production steps also increases. (C) Problems to
be Solved by the Invention The present invention is directed to the above-mentioned problems,
that is, the non-linear distortion or the point that the ro of the single speaker rises significantly
when the cabinet is fitted along with the downsizing and thinning of the cabinet. It is an object of
the present invention to provide a cost-effective loudspeaker diaphragm which is solved without
the occurrence of the rolling phenomenon and in which the number of production steps is not
increased. (D) Means for Solving the Problem In the present invention, there is provided a
diaphragm for a speaker, which is formed by integrally molding a sheet made of a thermoplastic
resin between a first cone paper and a second cone paper; A method of manufacturing a speaker
diaphragm comprising the steps of That is, in the method of manufacturing the speaker
diaphragm, the first cone paper is placed on a -1-one female mold heated to a predetermined
temperature (+ lL), and the thermoplastic resin is placed on the first cone paper. Mounting the
sheet, (b) melting the sheet and mounting a second cone paper on the sheet, and (c) heating the
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cone-shaped male mold heated to a predetermined temperature. and (d) pressing onto a die, and
integrally forming the first corn paper and the second paper with the melted sheet in a cone
shape together with the melted sheet. (E) The effect of increasing the weight of the working cone
paper is achieved by uniformly increasing the weight of the corn paper itself as a whole, without
adding other objects, so the load on the damper is reduced and non-linear distortion is caused. At
the same time, the rolling phenomenon is also prevented. The present invention will be described
with reference to FIGS. 1 to 5.
FIG. 1 is a schematic view showing a method of manufacturing a speaker diaphragm according to
an embodiment of the present invention. (1) is a female mold having a recess (1a) having a coneshaped cross section, (2) is a male mold having a protrusion (2a) having a cone-shaped cross
section, and (3) is a third 1 corn paper, (4) a second corn paper, <5> a flat sheet of 0.7 mm thick
made of a thermoplastic resin (for example, polyvinyl chloride). First, the first cone paper (3) is
placed on the recess (1a) of the cone-shaped female mold (1) heated to a predetermined
temperature (about 230 ° C.), and the first cone paper (3) is placed 4H to the sheet (5)! And
leave for about 10 seconds. The sheet 5) is thereby melted, and the second corn paper (4) is
placed on the melted sheet (5). Further, the cone-shaped male mold (2) heated to a
predetermined temperature (about 210 ° C.) is pressed onto the female mold (1) for about 1
second to make the first cone paper (3) and the second cone The paper (4) and the melted sea)
(5) are integrally formed in a cone shape. At this time, the melted sheet (5) is used as an adhesive
for bringing the first corn paper (3) and the second corn paper (4) into contact, and as a weight
additive for uniformly applying weight to the entire surface of the corn paper Furthermore, it
functions as a stiffening agent that uniformly reinforces the stiffness of the entire surface of the
corn paper. FIG. 2 is a schematic view showing a method of manufacturing a speaker diaphragm
of another embodiment, and the same reference numerals as in FIG. 1 denote the same parts as
in FIG. 1, and a description thereof will be omitted. 2 differs from FIG. 1 in that it does not use a
flat sheet as the sheet (5) but uses a sheet which has been vacuum-formed in a cone shape in
advance, whereby the sheet (5) described above is left Time can be shortened for about 5
seconds, that is, 5 seconds, and the defect rate can be lowered to improve the quality. FIG. 3 is a
cross-sectional view showing a sandwich structure of this diaphragm. Table 1 compares the
diaphragm of the other embodiment (FIG. 2) with the conventional diaphragm with a diaphragm
of 10 aTl. The first table also shows the amount of displacement of the diaphragm for a 50 g
weight. As is clear from Table 1, it can be seen that the diaphragm of the present invention is
significantly reduced in f'o to the conventional diaphragm and has excellent rigidity. Table 2
further shows the numerical values of a speaker of aperture 10 using this diaphragm. The second
table also, r. The internal volume is about 1 /! Shows the resonance frequency when the bass
reflex type cabinet is mounted. The thickness of the voice-fill bobbin was 75 μm in the
conventional speaker using a diaphragm, but in order to cope with the increase in weight of the
diaphragm, the speaker using the diaphragm according to the present invention uses 100 μ and
has an outer diameter of 2 cITl The four-layered one was used.
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Furthermore, the magnet used had an outer diameter of 5 cm and a thickness of 1 cm. FIG. 4 is a
diagram showing sound pressure frequency characteristics when the speaker of 10 Cm in
diameter is attached to a JIS box (refer to JIS C5531-1978), wherein (A) is a conventional
diaphragm and (B) is the present invention This is the case of the diaphragm. FIG. 5 is a graph
showing sound pressure frequency characteristics when similarly mounted on a bass reflex
cabinet, where (A) is a conventional diaphragm and (B) is a diaphragm of the present invention.
As is clear from FIGS. 4 and 5, it can be seen that the diaphragm of the present invention is
extremely superior in bass characteristics to that of the conventional diaphragm when assembled
in a speaker. (G) As described in detail in the invention, according to the present invention, the
resonance frequency (f ') of the speaker sail can be lowered, and excellent bass reproduction can
be performed cost-effectively.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a schematic view showing a method of manufacturing a speaker diaphragm according to
an embodiment of the present invention, FIG. 2 is a schematic view showing a method of
manufacturing another embodiment, and FIG. 3 is a cross section showing the structure of the
diaphragm. Figure.
FIG. 4 is a graph showing sound pressure frequency characteristics when the speaker is mounted
on a JIS box, in which (A) shows the conventional diaphragm and (B) shows the diaphragm of the
present invention. FIG. 5 is a diagram showing sound pressure frequency characteristics when a
speaker is mounted on a bass reflex cabinet, where (A) shows a conventional diaphragm and (B)
shows a diaphragm of the present invention. (1) ... female mold, 2) ... male mold, (3) ... first corn
paper, (4) ... second corn paper, (5) ... Sheet.
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