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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A and 1B are cross-sectional views of a
diaphragm of the present invention, respectively. 1c is a micropore, 1a is a polypropylene film,
1b is a metal layer.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of a
diaphragm for an electroacoustic transducer such as a speaker. In the case of a diaphragm for an
electroacoustic transducer such as a speaker, for example, when referring to a moving plate for a
speaker, conventionally, this kind of moving image is temporarily made by combining human
beings such as wood and glass or carbon fibers etc. Made of synthetic resin, such as polyester,
polyflouropian 7 and Holi fJF and other synthetic resin firnos, molded articles, and composite
structures in which metal is laminated on the surface of the above synthetic resin film. Two are
widely used. And in the thing using the said fiber, it has the fault that manufacture process is
complicated and it is difficult to obtain required rigidity. On the other hand, diaphragms using
synthetic resin films are extremely good in formability and are therefore suitable for mass
production, but they are determined by the rigidity of the diaphragm or the material of the filler
itself, and none have sufficient Young's modulus to make the material itself sufficient. Because of
this, it was not possible to obtain the necessary rigidity for the diaphragm by this alone. As
means for solving this problem, a synthetic resin film is used as a base, and high elastic modulus
metals such as beryllium aluminum, titanium and holo / etc. A composite diaphragm has been
devised in which the rigidity is increased and the internal loss of the synthetic resin film is
imparted with a moderate loss. However, in the composite diaphragm having the above-described
configuration, the bonding force between the synthetic resin film as a base and the metal layer to
be laminated on the surface becomes a problem. 3 In other words, the surface of the synthetic
resin film is extremely smooth, so the bonding force with the metal layer is small, and sudden
vibration of the diaphragm often results in an accident in which both are separated from each
other. As a means to solve this, roughening the surface of the synthetic resin film with
sandblasting or chemical work or tinog, or oxidizing the surface direction to increase the
adsorptive power of metal, but the former is fine rough It is difficult to form a surface, and
therefore it is not possible to obtain a contact area sufficient to obtain sufficient bonding
strength. In the former and the latter, when impurities are attached on the film surface, the
nonuniformity of oxidation impairs the nonuniformity of bond strength. This device is a
diaphragm in which a microporous polyflo pyreno film having a large number of fine pores is
used as a substrate, and metal is laminated in one direction or inward, in consideration of the
conventional 12 problems. explain in detail. The microporous polypropylene / film is a film of
polypropylene as a base material, and fine pores with a diameter of 100 to 10000 A are formed
with a porosity of 35 to 50% and a film of 0 to 80 μm, and the apparent two-letter cutting
specific gravity is It is a film-like material having a very low density of 0.49 to 0.56 fit-.
Then, the micropores 2 / polypropylene / film described in L are heat-pressed in a die having a
diaphragm shape (for example, dome shape) to form the diaphragm shape. At this time, it is
carried out with a mold at a temperature (130 ° C.-140 ° C.) lower than the melting
temperature (1700 C.) of polypropylene so that the micropores are not broken. Then, a
microporous polypileno film formed into a low moving plate shape is used as a substrate, and a
metal such as aluminum, titanium, beryllium, or boro 7 is laminated on both surfaces using
surface treatment technology such as vacuum deposition. In the first deposition, the metal is not
only deposited and deposited on the surface of the film, but also deposited manually by the
inside of the fine pores. As shown in FIGS. 1A and 1B, metal layers 1b and 1b are formed on both
sides of the film 5 substrate 1a, and a diaphragm 1 is formed in which the fine holes lc are filled
with metal. The diaphragm of such a configuration has the following effects. (1) The metal layers
1b and 1b formed on the front and back surfaces are connected by the metal filled in the minute
C so as to hold the substrate 1a. The cohesion with is significantly increased. (2) The metal is
filled not only at the surface of the substrate 1a but also at four parts thereof with the crucible,
so that the rigidity can be remarkably increased as compared with the conventional composite
structure. (3) The vibration absorption is long because the internal loss of polypropylene as the
substrate 1a is very close to the value required for the diaphragm (approximately tan δ · 01).
With the above effects, the speaker which can increase the diaphragm of the present invention
expands the piston vibration area, raises the Kosho ancient limit frequency, increases the human
resistance characteristic 11, and suppresses the disturbance of the frequency characteristic due
to the negative 1'Z resonance. There are six that have excellent effects that can not be obtained
with conventional diaphragms. In the above embodiment, although the structure in which the
metal is laminated on both sides of the substrate is described, it is a matter of course that even in
the case of the lamination on the surface c, the bonding force with the substrate is due to the
metal filled in a part of the minute holes. There is no change in the fact that