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The present invention relates to a method for forming a speaker diaphragm, and in particular, to
provide a method for forming a fixed type diaphragm having a remarkable effect in a small-sized,
general-purpose speaker. Generally, the diaphragm and the edge of the speaker are
manufactured in separate steps and are bonded together at the time of assembly. On the other
hand, there is a speaker using a paper diaphragm called a fixed type, but the method of
manufacturing the diaphragm is that the diaphragm part and the edge part are twice machined at
the paper making stage, and the paper is made by technology such as partial grinding. The
desired shape is obtained. In film diaphragms using a thermoplastic resin, it is usual to use as a
raw material film a film which has already been formed to a substantially uniform thickness, and
it is difficult to apply a papermaking technology such as a paper diaphragm. Therefore, at the
time of vacuum forming and pressure forming of a thermoplastic film, the peripheral portion of
the diaphragm is plastically deformed and thinned by utilizing the stress at the time of molding,
and the diaphragm having an arbitrary thickness distribution is formed A method has been
proposed. However, in this method, sufficient reproducibility can not be obtained unless the
boundary between the diaphragm portion and the edge portion is unclear and precise control of
the molding conditions is performed. In this method, too, the diaphragm portion becomes thin,
and there is a problem in that the acoustic characteristics, in particular, the reproduction level in
the high frequency band and the distortion characteristics are inferior. The present invention
provides a method for producing a film diaphragm in which a diaphragm and an edge are
integrated in a simple manner and with good reproducibility. As a result, the diaphragm portion
and the edge portion can be clearly divided by J-wax, and it is possible to reproduce from the low
band to the high band and to improve the distortion characteristics. A method of forming a
speaker diaphragm according to the present invention will be described. In the last months of the
diaphragm, Funo 51, which is mainly made of thermoplastic resin, is used. A low density resin
with a high elastic modulus is preferred as the heat plastic resin. For example, 01, polypropylene,
4 methyl penotene-1 polymer. Boria relay 1-Snow single or mixtures are good 3, to disperse
inorganic, organic reinforcement in these resins Q1 high bullet 1/1 is effective in JI 'l +; S.
Representative strengthening moon and 1. There are mituzu, carbon fiber set, and aramid tbQ iff,
which can be used as a composite system by adding 6 to 35 small 11: to 1-recording resin. The
accumulated moon as described above is filled and heated to near its melting point to make the
film flowable. In this state, a portion corresponding to an end portion adhered to the frame of the
speaker of film 1 is fixed with a 9 + 11 body.
An elastic body such as fluorocarbon rubber, fluoroprene rubber, etc. can be used. The rubber
elastic body can hold down the entire circumference of the covering portion, but it is also
possible to combine and use a plurality of inelastic body division molds by connecting them with
a spring having a spring property. Next, a diaphragm portion is formed at a central portion of the
film fixed in a ring shape by the elastic body. This is made by vacuum forming or / and pressure
forming or press forming using a mold of desired shape, t +, IrU. At the same time as molding, the
film is cooled in contact with the mold and lowered to a temperature sufficiently lower than the
melting point. Then, the process proceeds to the step of forming the edge portion. The edge 115
is formed by mechanically pushing the gap between the diaphragm die and the elastic body in
this manner. The operation of spreading can be achieved by means such as press-in of fluid such
as high pressure air, insertion of a pseudo-cylindrical ring of cross-section or the like. At this
time, the film must be hot enough to cause plastic deformation sufficiently. Therefore, it is
necessary to carry out from heating of the film to edge forming in a very short time. Finally, the
elastic body fixing the above-mentioned adhesive portion is removed from the film film C1 [high
pressure air, pseudo cylinder ring is removed, and the forming apparatus is returned to the initial
state. The following are a series of second steps of the method for forming a film diaphragm
according to the present invention. Below, based on an example, it describes concretely. Example
1 Polyarylate (polybisphenol phthalate type Q, ll, 30 parts of infutaric acid and terephthalic acid)
having the structure shown below as a forming film. A film of about 1001 tm thickness of 70
parts of the mixture, R'iJ: bisphenol A) was used. This film was heated to about 27Q "C, for about
16 seconds, and then immediately formed in two steps shown in FIG. FIG. 1A shows a heating
process of a film, in which 1 is a forming film and 2 is a heater. Fig. B is a fixing step of the
elastic portion of the elastic body, and 3 and 7 are too large when the elastic bodies 5 and 6
(here, silicone rubber is used) are pushed and spread by the cross section schematic pseudo
cylinder rings 4 and 8. It is a guide to regulate. The cross-sectional wedge-shaped pseudocylindrical rings 4 and 8 slide up and down on the outer periphery of the diaphragm part
molding die 9. 10 is a pipe and piston rod for vacuum suction. FIG. 6C is a process of forming the
diaphragm portion, in which the diaphragm portion forming mold 9 ascends to the film surface
and simultaneously the vacuum suction pipe 10 is used to decompress the cavity in the mold 9.
The mold 10 has an infinite number of minute holes, which are formed by suctioning the film 1.
In the same way, in the edge forming step, the elastic bodies 6 and 6 are pushed outward by the
cross section of the pseudo cylinder rings 4 and 8 approaching the film surface. Thereby, the film
is drawn thin and an edge portion is formed. The stretched ratio was about 4 times the initial
gap. At this time, since the film corresponding to the edge portion needs to have a sufficiently
high temperature, the process was completed in about 0.5 seconds during steps B-D. Since the
diaphragm portion is formed at the stage of step C and the film is cooled, the diaphragm portion
does not become larger and thinner than the initial film thickness. Since the margin part is still
formed at the stage of step B, this part is not stretched. In the case of an adhesive part, its
diameter is stretched slightly in the process and tends to be slightly thinner than the initial
thickness of the film. FIG. E shows a process of completing the forming and separating the elastic
body from the film surface. After the film is sufficiently cooled so as to keep the film for about 10
seconds), the elastic body is separated from the it film surface in the spread state. This is to
prevent breakage of the edge portion formed by returning to the original shape by the elastic
force of the elastic bodies 5 and 6 when the cross section of the pseudo cylindrical ring
8 is pulled out first. Step F is a step of simultaneously releasing the film from the mold and
returning the apparatus to the initial state 0, and this step may be performed substantially
simultaneously with the previous step E, or 1jJ 'fjf :. Table 1 shows the results of measuring pi 8
of the speaker diaphragm prepared according to the above-mentioned I-day. The measurement
points are each point of the loudspeaker shown in FIG. The solid line in FIG. 3 shows the acoustic
characteristics of the loudspeaker according to this embodiment. Distortion 't'-! The thickness of
the diaphragm portion of the + ? ? (21 ? ? was uniform, and generation of surface noise due
to in-plane split resonance could be suppressed, and generation of distortion was also small.
EXAMPLE 2 A film having a thickness of about 80 .mu.m was used, in which fine powders of
micas were dispersed in a weight of about H 215 in 4-methylpentene-1 polymer ? CH2-CHFn as
a forming film. FIG. 4 shows the process. FIG. 6A shows the heating process of the film 21. The
film is heated to about 300 ░ C. by the heater 22 to facilitate deformation. Fig. B shows two
steps of fixing the film with an elastic body 24.26. The elastic body is a skirt of a two-part mold
23 and a lower mold 25 made of chloroprene rubber in a ? shape, and the molds 23 and 25
move up and down by air pressure or oil pressure, respectively. The elastic body 24.26 is slidable
with the mold 23.25, and in this process, only the elastic body moves and fixes the film.
In this way, an end portion of the speaker assembly is formed. Numeral 27.28 is a small hole for
introducing high pressure air which is formed in plural on the 11111 surface of the mold. FIG.
6C is a process of partially forming a diaphragm of a film, which is formed by press forming
using a two-part mold. The molding method is not limited to the press molding, and the same
method can be employed in the same manner as in the vacuum molding method. This process is
an edge part forming process, and this process is entered within about 0.5 seconds after the film
heating process. This is because it is desirable that the film d be in a semi-molten state at the
time of molding. At this time, the diaphragm portion and the margin portion are each in contact
with the mold 2 elastic body and cooled, and the elongation d-may not be considered. In forming
the edge portion, high pressure air is fed between the mold and the elastic body from the small
holes 27.28 through the inside of the mold 23.25 to radially spread and thin the elastic body. As
a result, the gap between the mold and the support was expanded about four times. FIG. E shows
a process of separating the elastic body from the film surface. FIG. 11F is a process of taking out
the film after completion of the forming process 7 and at the same time a process of returning
the forming apparatus to its initial state. This molded product was also assembled as the speaker
shown in FIG. 2, and the thickness of each part of the molded film was measured. The results are
shown in Table 1. Sound J21) The characteristics are also very similar to those shown in Example
1. Reference Example The film used in Example 1 was molded by the molding method shown in
FIG. In the figure, A is a film heating process, the film 31 is heated by the heater 32 to about 270
░ C. for about 15 seconds. FIG. 6B shows the state immediately before vacuum forming, which is
characterized by the shape of the mold. The mold has a deep pocket, the diaphragm surface 36
has a large number of minute holes, and when the gas is evacuated from the vacuum suction port
33, the film is drawn to the mold 36. The thickness of the edge portion of the diaphragm is
controlled by the height 35 to the diaphragm surface and the projection 34 of the flange. Fig. C
shows a molded state. A vacuum is drawn through the mold surface, and the film stretches and
adheres to the mold surface 36 for molding. At the time of this molding, the backfill film with a
depth of 36 in the mold surface is drawn strongly around the periphery to form an edge portion.
The j-corner distribution of the diaphragm manufactured by this method is shown in Table 1, and
the assembled acoustic characteristics as a skier are shown by the broken line in FIG. According
to the present invention, according to the present invention, the thickness of the film of the
diaphragm portion can be formed uniformly, and only the edge portion can be formed thin
according to the first table (the roughness before forming is 1.0). .
In addition, the surface rigidity as a diaphragm is increased, and surface noise due to split
resonance can be extended to a high frequency band. Therefore, the distortion rate also
decreases in the necessary band. Even in the low frequency band reproduction, the stiffness of
the edge can be reduced. In addition to the above-mentioned excellent acoustic characteristics,
the industrial value is also high, which can be precisely stretched and thinned to the intended
size of the edge portion. Furthermore, when assembling into a speaker, there are advantages
such as the fact that the margin portion is formed and the handling is extremely easy. Although
only two examples are shown in the examples, substantially the same results were obtained even
if the film thickness, diaphragm shape, and material composition were changed. Still, regarding
the method of forming the edge, although the flat edge is described in the present embodiment, it
is also possible to form it in an arc when the cross section of the edge is seen. That is, in FIG. 1,
for example, the tip of the cross-section wedge-shaped pseudo-cylindrical ring 4 is rounded in a
convex shape, the tip of the pseudo-capsular ring 8 is similarly rounded in a concave shape, and
the edge portion is pressed at the final stage. It is also possible to mold and shape the edge
portion in an arc shape. In the step of FIG. 1C, compressed air can be introduced from the upper
part in the drawing to form an edge into a convex arc shape downward in the drawing. Also in
FIG. 4, the edge portion can be shaped like a circular arc by increasing one side of the introduced
air pressure in the process.
Brief description of the drawings
FIG. 1 is a process diagram of a method for forming a speaker diaphragm according to an
embodiment of the present invention, and FIG. 2 is a cross-sectional view assembled to the
FIG. 3 is a frequency characteristic diagram of the speaker created according to the present
embodiment and the reference example. FIG. 4 is a process diagram of a speaker diaphragm
forming method according to another embodiment of the present invention. FIG. 6 is a process
diagram of a speaker diaphragm forming method according to a reference example. 1 и и и и и и и и и и
и и и и и и и и и и и и и и mainly thermoplastic resin, 4 ░ 8 и и и и и section pseudo cylindrical ring 5, 6 и и и и и
и elastic body, 9 и и и Diaphragm part mold 11, 11 ... Diaphragm 12, 12 ... .. Edge, 13 .... Slope part,
14 ... Yoke, 16 ... и и и и и и и и и и и и и и и и Voice coil, 16 и и и и и и magnets и 17 и и и center ball, 18 и и и и и и и и и
и и и и и и films mainly made of thermoplastic resin, 24, 26 ииииии Elastic body, 23, 26 ииииииииииииииии Mold.
Name of agent Attorney Nakao Toshio and others 1 person Figure 2 Figure 3 Figure 11 Namiyo
(Hp) Figure 4 Figure 5 Figure 1 Procedure Amendment (Method) & Patent application No.
97,930 No. 2 name of the invention Inventive method of forming a diaphragm of a speaker The
relationship between the following: 1.1 'Persuasive application personnel location Osaka
Prefecture Kadoma city Ogata Kadoma 1006 Address name K' + и (582) Representative of
Matsushita Electric Industrial Co., Ltd. and 111 Shun Shiko 4 agent ? 571 residence Osaka 1 tf
?Sakai City Ojimon ''! Address 1006 Matsushita Electric Industrial Co., Ltd. 7 Contents of
correction (1) Correction method to ?Method for forming speaker diaphragm? ?Method for
forming vibration for all speakers? in the column entitled ?Description of the invention?.
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