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JPS55144486

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DESCRIPTION JPS55144486
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of a
speaker diaphragm according to the present invention, and FIG. 2 is a frequency characteristic
diagram of the speaker diaphragm. 1 ииииии Diaphragm base body, 2 ииииииииии Ti layer. In the drawings,
the same reference numerals indicate the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an 11111 mKpreferred speaker diaphragm for medium- and high-tone dome-shaped speakers. Generally, glass
fiber reinforced f-) stick (hereinafter referred to as C1 ? ?-41, иии, 9 kLP) or longitudinal element
fiber reinforced plastic (hereinafter referred to as CFRP) has a large Young's modulus, and
therefore the speed of sound Because it is fast and the high frequency limit frequency is high,
and the internal loss is also sufficiently large compared to metal, so unnecessary peaks are not
likely to appear in the high frequency characteristics, so it is useful as a diaphragm for speakers.
There were those which constituted the diaphragm of the dome-shaped speaker for middle and
high-pitched sound mainly by using the GFRP and FiCFRP of this virtue. However, when the
speaker diaphragm is simply composed of GFKP or Cj "ItP, it is very small when compared to
Young's ? 4 metal, so the high frequency limit M11 technique is superior to metal loudspeaker
diaphragms. I got a low value. This device has been made under the circumstances as described
above, and it is a loudspeaker diaphragm of a wide band characteristic whose high frequency
limit frequency is increased without losing the advantage of 1 ? ? kLP or CFkP (the point
where the internal loss is large). Intended to provide. An embodiment of the present invention
will be described below with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view showing
an embodiment of a speaker diaphragm according to the present invention, in which 1 is a
diaphragm substrate formed by forming a GFk LP or CF) LP into a dome shape as shown in the
figure, 2 shows this vibration For example, it is an 11Ti (titanium) layer, which is a parallel layer
deposited on the surface of at least one of the inward and outward faces of the plate substrate 1,
for example, the inner surface thereof, by deposition. That is, in the present invention, at least
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1
one of the inner and outer surfaces of the diaphragm base 1 made of Gl "RP or CFRP is coated
with a metal layer such as a 1-nm layer 2 or the like. The second bad figure is a diagram showing
the frequency characteristics of the speaker diaphragm according to the invention shown in FIG.
(-1) shows the characteristics of this invention diaphragm, and 1) shows the characteristics of the
conventional diaphragm. As apparent from FIG. 2, according to this invention, the ^ area critical
chest wave number is extended to the high frequency side by the action of the gold layer such as
the Ti layer 2 temporarily attached to the base 2 Thus, it is possible to provide a speaker
diaphragm having a wide band characteristic. In addition, although the case where T1 was used
as a metal material of 1 metal layer was mentioned in the above-mentioned practical example,
others, M. Various all poles such as Be and B can be used. Further, the metal layer can be coated
not only on the inner surface but also on both surfaces) to obtain a further effect.
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