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JPS5748786

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DESCRIPTION JPS5748786
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, FIG. 2, and FIG. 3 are cross-sectional views of a
dome-shaped diaphragm on which vapor deposition coating is applied. 4, 5 and 6 are crosssectional views of a cone-shaped diaphragm deposited by vapor deposition. 1 is a substrate, 2.3
is a vapor deposition film.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for a
speaker having a high Young's modulus, which is formed by vapor deposition of magnesium mu
lithium alloy on the surface and / or back surface of a synthetic resin film to form a film.
Conventionally, a film deposited on the surface of a polyester film substrate of a diaphragm for a
speaker is represented by aluminum, titanium, or beryllium, and a thickness of about 300 to 400
i is often used. Such vibration right can not be expected in the Young's modulus direction 'L of
the diaphragm main body. For example, when titanium is deposited by vapor deposition on a
polyester film having a thickness of 30 microns, Young's modulus (1 m) · 4 / '/ 2 per 1 polyester
film, 0.001 × 10 "dyne / c- It's 7 years old. In the past, the thickness of the vapor deposited film
or at least several microns or more would be required. However, aluminum, titanium, etc. are not
suitable because thick materials of vapor deposited film are too heavy, and high frequency band
for high frequency reproduction limit can be obtained in high pitch width characteristic when
swallowed into a speaker, and all There is a drawback that the efficiency of the range is low.
From this point of view, beryllium is suitable because it is lightweight and rigid. However,
beryllium is harmful to human body during the manufacturing process, and is dangerous and
solid, and it requires a high temperature for vapor deposition, so it has a certain thickness. It took
a long time to get in trouble. The diaphragm of this invention is a vibration right that has
eliminated the above-mentioned drawbacks. The embodiment will be described below with
reference to FIGS. 1, 2, $ 3, 4, 5, and 6. FIG. 1 is a cross-sectional view of a diaphragm formed by
forming a dome-shaped diaphragm substrate 1 of a polyester film of 30 μm thickness and
vapor-depositing a magnesium-litchie 3 ram alloy film 2 of 10 μm thickness on the surface
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thereof. . Table 1 shows the density rho (gr / cm ') when the aluminum, titanium, beryllium, and
magnesium-lithium alloys are deposited to a thickness of 10 microns on the diaphragm substrate
of a polyester film of 30 microns or less. And the square root of the ratio of Young's modulus E
(x1o'1d '' '/ m) to dense Tfpt7) (i.e., propagation velocity). As seen from Table 1, the magnesiumlithium alloy film has a smaller value of 'lρ (density over the prefecture) compared to aluminum
and titanium, and a high propagation velocity (JE / ρ is large). It is most suitable as a diaphragm.
The above-mentioned physical properties are either good or they are inconvenient in handling, so
they are disadvantageous in that they are expensive to manufacture.
As described above, the diaphragm coated with the magnesium murium α group is easy to
handle since it does not require a high grade of 7 in the manufacturing process, and the product
diaphragm is very young, has a low density, and a high propagation speed. When it is
incorporated into a speaker, it becomes a speaker with good characteristics in which the high
frequency limit solid four wave number is high and the egg weight is also high. FIG. 2 is a crosssectional view of a diaphragm in which a magnesium-lithium film 3.3 is applied to the front and
back surfaces of a similar diaphragm substrate 1. FIG. 3 is a magnesium-lithium film on the back
surface of the diaphragm substrate 1. FIG. 4 is a cross-sectional view of a diaphragm in which a
magnesium mo-cum lithium substrate 2 is applied to the surface of a cone-shaped diaphragm
base body 1; FIG. FIG. 6 is a cross-sectional view of a diaphragm in which magnesium and lithium
are deposited on the front and back surfaces of a cone-shaped diaphragm substrate 10, and FIG.
In the cross-sectional view of the diaphragm on which the film 2 is applied, any diaphragm can
obtain the same effect as described above. In addition, as for the compounding ratio of
Magenesiu L ・-lithium coating, 90-10 is desirable normally, as the vapor deposition method is
an ion plate jig method and low temperature sparring method, both are real @ 6i'i) and it is
convenient. The manufacturing cost is also low. The value of Young's modulus 2.6 X 10'1 dy "/when the polyester film alone is obtained by applying 5 microns of 10 microns thick evaporated
magnesium-lithium alloy to a 30 micron thick book label film. 8. FI×10””n6/cn? By
the author's L <directive, f> also, the diaphragm of the present invention device is excellent? You
can see if you want to ♀ ♀ characteristics.
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