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JPS62135099

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DESCRIPTION JPS62135099
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker in which a diaphragm in which a metal film of low density and high
modulus is formed on the surface of a molded plastic film and an edge are integrated.
[Background of the Invention] Conventionally, a molded article of a plastic film is used as a
substrate, and a metal having a low density and a high elastic modulus on its surface or a
compound of those metals (hereinafter referred to as a deposited material). A speaker diaphragm
formed by means such as vacuum deposition or ion plating. An example of this type of
diaphragm is JP-A-55-87791. ここで。 When using a plastic film for the substrate, to make the
rigidity of the diaphragm equal to that when using a commonly used aluminum alloy, metal foil
such as titanium for the substrate, a deposit formed on the substrate Needs to be increased. The
deposition film formed by vacuum deposition, ion plating or the like generates internal stress
depending on the film forming conditions, and the stress increases with the increase of the film
thickness. On the other hand, when the internal stress of the vapor deposition film becomes
larger than the shape retention of the substrate due to the relationship between the two because
the plastic film has a significantly smaller shape retention than the metal foil such as aluminum
alloy and titanium. A deformation (curling) as shown in the figure occurs. In FIG. 4, 1 is a plastic
film substrate molded into a dome shape (hereinafter referred to as a substrate). 2) is a vapor
deposited film (hereinafter referred to as a vapor deposited film) composed of a low density, high
elastic modulus metal or a metal compound thereof. )である。 When the film thickness of the
vapor deposition film 2 is thin and its internal stress is smaller than the shape retention of the
substrate 1, the state as shown in FIG. 4 (a) can be maintained. However, as the film thickness of
the vapor deposition film 2 is increased, the internal stress of the film is also increased and
becomes larger than the shape retention of the substrate 1 and curling occurs as shown in FIG. 4
(b). It was poor for practical use. Therefore, although the deposit of low density and high elastic
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modulus is conventionally formed, the film thickness of the deposited film is thin, so that the
effect can not be sufficiently exhibited. It has been necessary to assemble a vibration system
using a jig that prevents deformation. SUMMARY OF THE INVENTION The object of the present
invention is to eliminate the above-mentioned drawbacks of the prior art, and a thick deposited
film can be formed on a plastic film substrate without causing deformation such as curling.
Another object of the present invention is to provide a method of manufacturing a speaker
diaphragm having an effect of reducing the number of assembling steps of the vibration system
and preventing the lateral vibration of the vibration system.
SUMMARY OF THE INVENTION In order to achieve the above object, in the present invention, in
order to strengthen the shape-retaining power of a plastic film substrate, a collar integrated with
the same material is attached to the outer peripheral portion of the substrate, and this collar is
edged Use as. The edge is of a roll or tangential type, and the formation of this edge utilizes the
heat generated when forming a deposited film on a substrate. Further, the structure for forming
this edge is characterized in the manufacturing method in that it has an effect of simultaneously
preventing the thermal contraction of the plastic film substrate. DESCRIPTION OF THE
PREFERRED EMBODIMENTS The following will explain one embodiment of the present invention
with reference to the drawings. FIG. 1 is a cross-sectional view showing a method of
manufacturing a speaker diaphragm according to the present invention. Predetermined
dimensions as shown in FIG. 1 (a) by a commercially available biaxially stretched polyethylene
terephthalate film having a thickness of 9 to 50 μm by a matching die molding method. It is
formed into a diaphragm portion 5 having a shape and a flange portion 6 around it, and this is
used as a substrate 1. In the example, the molding temperature was 180.degree. Subsequently,
the substrate 1 is held by the substrate holders 3 and 4 shown in FIG. 1 (b) and fixed with screws
1o as shown in FIG. 1 (c). At this time, a semicircular projection 9 is formed on the flange portion
6 of the substrate 1 by the annular groove 7 having a semicircular cross section provided on the
substrate holder 3 and the projection 8 having a semicircular cross section provided on the
substrate holder 4. This is the portion that will later be the edge, and in this example it will be the
upper convex roll edge. In addition, the edge shape (for example, a roll or tangential shape)
dimension can be arbitrarily set to be an upward convex or a downward convex by defining the
shapes and dimensions of the groove 7 and the projection 8. Next, a vapor deposition film 20 is
formed on the surface of the diaphragm portion 5 of the substrate 1 fixed to the substrate holder,
-3, 4. In this example, titanium nitride was formed by reactive high frequency ion plating. Here,
the temperature of the substrate holders 3 and 4 is controlled to be 140 to 180 'C during the
plating. The projections 9 formed on the flange portion 6 of the substrate 1 are formed into
edges 9 by the same effect as performing mattide die forming (pressing and heat forming with a
pair of male and female molds). Also, the plastic film used as a substrate here undergoes heat
shrinkage as the ambient temperature rises. Here, however, the vibration of the substrate 1 is
caused by holding the flange portion 6 of the substrate 1 by the annular groove 7 and the
projection 8 having semicircular cross sections, which are provided in the substrate holders 3
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and 4 as described above. Since the tension is applied to the outside which is the direction
opposite to the heat contraction direction generated in the plate portion 5, the heat contraction
can be prevented at the same time.
Here, it is also conceivable to simultaneously form the edge when making FIG. 1 (a), but with this
method, since the above-mentioned tension can not be given to the diaphragm portion 5,
deformation of the diaphragm is induced. Similarly, tension can not be applied to the diaphragm
portion 5 simply by holding the holder 3 with the flange 6 in a flat state as shown in FIG. 1 (a).
After the substrate 1 is formed to have a predetermined film thickness, the substrate 1 is cooled,
removed from the substrate holders 3 and 4, and the flange portion 6 is formed to have a
predetermined dimension. FIG. 1 (d) shows a vibration system in which a diaphragm in which a
titanium nitride film 20 is formed on a polyethylene terephthalate film substrate 1 manufactured
by the method for manufacturing a speaker diaphragm of the present invention and an edge 9
are integrated. Since the shape holding power of the substrate 1 is strengthened by the presence
of the edge 9, deformation such as curling is less likely to occur. FIG. 2 shows an external view of
an essential part of the substrate holder 4 shown in FIG. 1 as viewed from directly above. In the
embodiment, bonding and fixing with the substrate holders 3 and 4 were performed with a total
of eight screws. 8 is an annular protrusion whose cross section is semicircular. FIG. 3 shows the
diaphragm when it is manufactured by the method of manufacturing the diaphragm according to
the present invention and the conventional diaphragm shown in FIG. 4 when the thickness of the
polyethylene terephthalate film substrate used is changed It is the characteristic view which
showed the film thickness of the titanium nitride film which can be formed without causing
curling. In FIG. 3, reference numeral 30 denotes a conventional diaphragm shown in FIG. 4, and
reference numeral 40 denotes a diaphragm manufactured by the method of manufacturing a
diaphragm according to the present invention. As apparent from the figure, the diaphragm
according to the present invention has a curling effect because the shape retention of the
substrate is larger than the internal stress generated in the film, even if the titanium nitride film
is formed over the thickness of the substrate used. It does not happen. [Effects of the Invention]
As described above, according to the present invention, since a low density, high elastic modulus
metal or metal compound film thereof can be formed thick on a plastic film substrate, the
characteristics of the diaphragm can be formed. The characteristics of the high specific elastic
film can be made as close as possible, and a diaphragm having a rigidity higher than that of the
conventional one can be obtained, and the acoustic characteristics (for example, high frequency
resonance frequency) of the speaker can be improved. Further, since the edge portion is also
integrally formed, it is possible to reduce the number of assembling steps and to prevent the
reduction in rigidity due to the adhesion between the edge and the diaphragm. Since the roll or
tangential-shaped edge is formed, there is an excellent effect such as prevention of the rolling
(rolling) phenomenon of the vibration system when used as a speaker.
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[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view showing a method of manufacturing a diaphragm for a speaker
according to the present invention, FIG. 2 is an external view of an essential part of a substrate
holder according to the present invention as viewed from directly above, and FIG. 3 is a
diaphragm according to the present invention 4 is a characteristic view showing the relationship
between the curling phenomenon and the thickness of the polyethylene terephthalate film
substrate and the thickness of the titanium nitride film to be formed, and FIG. 4 is a crosssectional view showing the disadvantages of the conventional diaphragm.
1: plastic film substrate, 2.20: low density, high modulus metal or metal compound film thereof
3, 4: substrate holder, 5-:-diaphragm portion. 6 · · · flange portion, 7 · · · annular groove with a
semicircular cross section. 8: Annular projection having a semicircular cross section, 9: Edge
(protrusion), 10: Screw, 30.40: Characteristic straight line indicating the limit at which curling
occurs. . 7 ° C
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