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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
improvement of a speaker diaphragm, and more particularly to a speaker diaphragm having a
small change in internal loss over a wide temperature range. [Conventional Art] In the past, most
diaphragms for speakers were diaphragms mainly made of paper valves, but there is a fatal
defect that rigidity is small and product variations in the manufacturing process In recent years,
diaphragms made of synthetic resin, diaphragms made of metal foil, diaphragms made of metal
foil, metal foils, and the like in particular have a disadvantage that the change in the physical
characteristics is caused by changes in the humidity temperature in the air. A diaphragm
combined with a large loss synthetic resin is considered and is put to practical use. [Problems to
be Solved by the Invention] A synthetic resin used in combination with a metal foil, which has
been widely used in recent years, acts as an internal loss imparting material (loss material,
damping material), and the internal loss is large. Although characterized, the internal loss of the
synthetic resin generally has such a temperature characteristic that it has the highest internal
loss value near Tg (glass transition point), and the internal loss is significantly reduced in the
temperature range before and after this temperature Tend to In practice, the temperature having
the maximum internal loss value at room temperature, for example, around 15 ° C. is often
used. Therefore, for example, due to temperature rise of the diaphragm due to heat generation
from the voice coil due to long-term use, and change in room temperature due to seasonal
change, the internal loss value changes significantly, which causes a defect due to the change in
sound quality of the speaker . [Means for Solving the Problems] The present invention is a
composite material in which at least a restraint plate, a first loss material layer, and a second loss
material layer having a different temperature characteristic from the first loss material layer are
laminated. It is the diaphragm comprised more. [Example] As shown in FIG. 1, a first restraint
plate 11a (material aluminum, thickness 10100) 1, a first loss material layer 12a (material
polyvinyl acetate, thickness 201 Lm), a second restraint Plate 11b (material aluminum 11,
thickness 101001L, second loss material Fjll 2b (material polypropylene, thickness 2011m),
third restraint plate 11C (material aluminum, thickness 10071m) are sequentially laminated and
integrated to perform complex vibration Get the board material. And the diaphragm 1 of a
desired shape is obtained by the predetermined | prescribed shaping | molding method of the
said composite diaphragm raw material. [Function] Due to the above configuration, the
temperature characteristics of the internal loss of at least the first loss material and the second
loss material having different temperature characteristics of the internal loss act like staggers,
and the inside of the system against a wide range of temperature change It was possible to
reduce the change in loss. [Effects of the Invention] It is formed of a composite diaphragm
material in which the diaphragm 1 of the above embodiment, and aluminum (200 tt m thick),
polyvinyl acetate (20 um thick), and aluminum (200 um thick) as a comparative example are
sequentially laminated. Of internal loss against temperature of diaphragm made of composite
diaphragm material in which laminated diaphragm, aluminum (2007 zm thickness),
polypropylene (20 um thickness) and aluminum (200 um thickness) are sequentially laminated Is
shown in FIG.
As apparent from the drawing, the diaphragm 1 according to the present invention has a slight
reduction in the value of the internal loss itself as compared with the diaphragms 1 and 2 of the
conventional example, but the amount of change is extremely small over a wide range of
temperature change. It has a feature. This is an advantage that the characteristics of the speaker
such as sound quality and frequency characteristics can be suppressed from changing over a
wide range of temperature change, and the initial characteristics can be maintained regardless of
long-time use or room temperature change. Have. FIG. 3 shows another embodiment of the
present invention, in which a first restraint plate 31a, a first loss material% 132 a, and a second
loss material 1t! It is a diaphragm which shape | molded the composite diaphragm raw material
obtained by laminating | stacking 32b one on another and integrating it. FIG. 4 is a composite
diaphragm material obtained by sequentially laminating and integrating the first restraint plate
41a, the first loss material layer 42a, the second loss material layer 42b, and the second restraint
plate 4ib. It is a diaphragm. The same effects as those of the above-described embodiments can
be obtained in the above-described two embodiments, but the embodiments of FIGS. 1 and 3 in
which the restraint plates are disposed on the upper and lower surfaces have a greater internal
loss. it can.
Brief description of the drawings
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