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JPH02174397

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DESCRIPTION JPH02174397
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm of a speaker, and more particularly to a diaphragm of a speaker suitable for a
squawker or a tweeter. In the prior art, as a diaphragm of a speaker, for example, a thermosetting
resin was mixed with a fiber, and a sheet was heated and molded into a desired shape. After that,
a graphite diaphragm obtained through primary firing and main firing has been provided.
However, although the ratio 1ri of the described diaphragm is a light Id of 15 to 1.6, it does not
have sufficient performance as a speaker diaphragm in acoustic physical constants such as
transmission speed and internal loss, and in particular There is a disadvantage that the resonance
occurs in the high range because the internal loss is small. In addition, since the surface of the
diaphragm is shrunk by firing and becomes rough, the surface polishing needs to be performed
as much as 1 and the cost is increased. The present invention has been made in view of the
above-described point, and the first aspect of the present invention is a diaphragm of a speaker
for reducing the resonance of the high range by increasing the internal loss, thereby improving
the sound quality. To provide. (Iii) Means for Solving the Problem The speaker diaphragm of the
present invention is made of aluminum oxide (^ Qxoi or silicon oxide (Sins) or magnesium oxide
(! It forms the surface layer which consists of an oxygen compound of JgO). (D) Operation
According to the present invention, a surface layer made of aluminum oxide (IQ, Q,) or silicon
oxide (5iOz) or oxygen compound of magnesium oxide (MgO) on one side or both sides of the
glassy carbon diaphragm substrate Internal loss increases. (E) Embodiment An embodiment of a
diaphragm of a speaker according to the present invention will be described based on FIGS. N
and 2. FIG. 1 is a sectional view of a diaphragm, and FIG. 2 is a block diagram of a high frequency
ion plating apparatus. In the figure! Is a diaphragm base made of glassy carbon, 2 is aluminum
oxide (AQ, 0. 0) formed on the surface of diaphragm base 1 by a high frequency ion plating
apparatus. Surface layer of The manufacturing conditions of the diaphragm base 1 made of
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1
glassy carbon are as follows. ■ Thermosetting resin Phenolic resin ■ Cellulose fiber Melt Kraft
paper ■ Blending ratio Thermosetting J Rely resin carbide / cellulose fiber paper carbide = 30 /
+ 00 ■ Material shape Sheet shape Thickness 50μ ■ Diaphragm shape Dome shape 0 type 1; l
50 · c 50 g / cn + "10 minutes ■ primary firing 350 · C1 'jlf 4 speed 1, 5 · C / hour ■ wood
firing 1!
00 ° C. world temperature 50 ° C./hour Furthermore, the vibrator base number 1 obtained by
using a wooden ball is confirmed by X-ray diffraction that 1 is a glassy carbon composed of II
quality components of carbon. In FIG. 3, the diaphragm base material 1 described in 1 is set in
the high frequency ion plating apparatus 3 and the state of vacuum heating r 1 of the surface
layer 2 of aluminum oxide on the surface of the diaphragm 1 is reduced. ing. Thereafter, the
formation stripe f [of the surface layer 2 is formed. ■ Achieved degree of vacuum +-'' Torr or
more ■ Ion bombarding argon atmosphere. -2 'l' o r r Applied ff 3 a 100 OV Time 15 minutes
Operating vacuum degree 5X at CD deposition. -"Rorr introduction gas 3b argon ■ high
frequency power 3c I 3.55 MIIZ 300W ■ electron gun output 3d 10 ■ ■ target 3e aluminum
oxide 999x ■ substrate voltage (current)-300 V O, 3 (A) ■ deposition rate 200 (person / m1 nt
Under the above conditions, the thickness of the surface layer 2 formed on the surface of the
diaphragm substrate 1 is about 3 μm. Table 1 shows acoustic constants when the surface layer
2 indicated by f = is formed and when the surface layer 2 is absent. Although the surface layer 2
is formed of aluminum oxide (AQIO) in this embodiment, the surface layer 2 may be formed of an
oxygen compound of silicon oxide (Sin or magnesium oxide (MgO). If the sintering temperature
of carbon as the diaphragm substrate is set to be higher than 3 QOO c or more, crystallization is
promoted and it can be made hexagonal graphite, so the acoustic constant of the diaphragm is
shown in Table 1 It can raise to-1 below. (E) Effects of the Invention According to the diaphragm
of the speaker according to the present invention, since it is configured as described above, (1), r;
In I-shi, reduction of the division vibration by the expansion of the 1FI raw frequency dissipation
11 sound area of the speaker, and the increase of internal loss, in history. The diaphragm base is
covered by the surface layer, and defects caused during firing such as Vimpol can be prevented
without special treatment, thus simplifying 1- 稈Effects such as cost benefits. In addition, it has
an excellent feature that the structure is simple 1 and can be configured inexpensively, so that
the implementation is easy.
[0002]
Brief description of the drawings
[0003]
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2
1 and 2 show an embodiment of a diaphragm of a speaker according to the present invention,
FIG. 1 is a cross-sectional view, and FIG. 2 is a block diagram of a high frequency ion plating
apparatus.
l Detailed description of symbols 1: Vibration temporary base material 2: Surface layer 3: High
frequency ion plating device Patent applicant: Kenwood Co., Ltd. Fig. 2
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