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JPS5533339

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DESCRIPTION JPS5533339
The present invention is directed to a center cap for a boron boronated diaphragm made of corn,
wherein a boron layer is made to penetrate the surface of a base metal and a boron diffusion
treatment is performed.
Center cap for cone overflow boronated diaphragm
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a center cap for use in a corn-boronated diaphragm. In general, as shown in FIG. 18, the center
cap 1 is made of a soft material such as paper or cloth or a hard material such as an aluminum
foil, a titanium foil, or a polymer material film. In one case where a center cap made of these
materials is used for a cone speaker made of a boronated diaphragm, the longitudinal elasticity
coefficient of the center cap is smaller than that of the boronated diaphragm, so the radiation
from the center cap There is a difference between the sound quality of the sound and the sound
quality radiated from the diaphragm. In particular, in the case of performing high-frequency
reproduction with the center cap, it is necessary to increase the longitudinal elasticity coefficient
of the center cap itself in order to improve the high-frequency characteristic. Note that if the
density of the center cap is made small, the high frequency characteristics will be further
improved relatively. In view of the points above the non-invention line, by providing a center cap
suitable for applying to a boronated diaphragm, the radiation sound quality from the center cap
and the radiation sound quality from the diaphragm are made to be the same, and in the cone
speaker Let's improve the high frequency characteristic together with EndPage: 1. An
embodiment of the present invention will be described below with reference to the drawings. FIG.
1g2 is a longitudinal vertical sectional view showing an example of a center cap made of a
boronated metal such as a titanium material. The center cap is formed through a high
temperature diffusion process at about 100 ° C. to allow the boron layer 3 to penetrate the
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surface of the titanium material 2 as the base metal. That is, this center cap can be boronated by
the same method as that for the diaphragm borated. * A boronated center cap is incorporated
into the same boronated diaphragm, and 19 each time an acoustic speaker is assembled. And the
center cap itself can be used for high frequency reproduction. As described above, according to
the present invention, since the boron layer is made to penetrate the surface of the base metal of
the center cap to perform boron diffusion treatment, both of the radiation sound quality is
improved when combined with the boronated diaphragm. The sound quality can be improved to
achieve the same quality. Furthermore, according to the present invention, since the longitudinal
elasticity coefficient of the center cap itself is high, it is possible to perform high-frequency
reproduction efficiently by using the center cap as a part of the diaphragm.
4 is a longitudinal sectional view showing an example of a conventional center cap, and FIG. 12 is
a longitudinal sectional view showing an example of the center cap according to the present
invention. 2 ······· Base metal 3 ············ Boron layer EndPage: 2
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