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JPS61102900

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DESCRIPTION JPS61102900
[0001]
[Object of the Invention] (Industrial field of application) The present invention relates to a
diaphragm for a speaker, particularly a diaphragm suitable for a tweeter or a squawker. (Prior
Art) Conventionally, various methods have been known as methods for increasing the rigidity of
a diaphragm in order to improve the high frequency characteristics and the sound quality of a
speaker diaphragm, for example, a metal diaphragm It is known to form a surface-hardened layer
of an inorganic material on the surface of a substrate by an ion plating method. (Problems to be
Solved by the Invention) Even in the case of forming a surface hard layer by the ion plating
method as described above, it is desirable to obtain a diaphragm excellent in characteristics, as to
what is to be used as the surface hard layer material. When it comes to In the present invention,
the above-mentioned ion plating method is used, but the object of the present invention is a
diaphragm which is extremely excellent in characteristics, is particularly suitable for tweeter and
squawker, and can obtain excellent color tone. It is to provide. The diaphragm for a loudspeaker
according to the present invention comprises an original material of ruby or sapphire as a raw
material on one side or both sides of a metal diaphragm base material, and an ion plating method
To form a surface layer mainly composed of alumina. (Function) The surface of the metal
diaphragm base is further hardened by the surface layer mainly composed of alumina plated with
ruby and raw stone of sapphire as a raw material, and the high-pass characteristic becomes
extremely excellent. In particular, since the surface of the diaphragm exhibits a unique color
tone, it is most suitable as this type of speaker which is also important in terms of appearance.
(Embodiment) An embodiment of a speaker diaphragm according to the present invention will be
described based on FIG. 1. The illustrated example is an example in which a dome-shaped
diaphragm has been implemented. 2 shows a metal diaphragm base material. A surface layer 3 is
formed on at least one surface of the metal diaphragm base material 2 by an ion plating method
using ruby or sapphire raw material mainly composed of alumina (A, Q20s) as a raw material.
11-05-2019
1
The above-mentioned ion plating method is a well-known method, but the conditions thereof are
as follows for an example using natural ruby as an example thereof. (1) The diaphragm substrate
(thickness 25) formed of Ti (titanium) was washed and set so that hard layers were formed on
both sides. (2)% vacuum evacuation -10 Torr (3) ion bombardment argon gas pressure 5 × 10 -2
Torr O, 1-5 KV (4) DC ion plating page porosity 10 -5-10-"torr deposition rate 0.25 final / 5 in-.
(5) Cooling FIG. 1 shows an example in which the surface layer 3 is formed on one side of a
titanium dome-shaped diaphragm (thickness 25 final). Of course, the above-mentioned
diaphragm can be used also for other vibration system parts such as chan, and it goes without
saying that the loudspeaker diaphragm is not limited to the above-mentioned dome shape. Effect
of the Invention According to the speaker diaphragm of the present invention, a surface layer
mainly composed of ruby or sapphire raw material by an ion plating method is formed on at least
one side of a metal diaphragm base by an ion plating method. Since the frequency characteristics
in the high region can be significantly improved because of the formation, therefore, the sound
quality can be improved, so that the diaphragm of the present invention exhibits excellent effects
as a diaphragm particularly for tweeters and scoars. In addition, since the material of one surface
layer is natural ruby or sapphire, it is excellent in color tone, and is most suitable as this type of
diaphragm which is also important in appearance.
[0002]
Brief description of the drawings
[0003]
FIG. 1 shows an embodiment of a speaker diaphragm according to the present invention, FIG. 1 is
a cross-sectional view showing an example in which a surface layer is formed on one side of a
metal diaphragm, and FIG. 2 shows an example formed on both sides. It is a sectional view
showing.
1: whole diaphragm 2: 2: metal diaphragm base 3: surface layer
11-05-2019
2
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