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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm of a speaker unit by depositing a metal material on the surface of a predetermined
mold. [Prior Art] FIG. 8 shows the vibration of the speaker unit (2) made by welding, vapor
deposition or chemical deposition of metal material, etc. It is a trimming process that cuts to the
required dimensions. In the figure (! Is a diaphragm, (2) is a mold for forming the film, and (5) is
a trimming type. By the way, the performance required of the diaphragm is firstly light and
secondly rigidity is large, lightness is greatly related to the conversion efficiency or efficiency of
the speaker, and the magnitude of rigidity is the high frequency reproduction limit of the speaker
Fat. [Problems to be Solved by the Invention] For the above reasons, the thickness of the
diaphragm has conventionally been increased in order to increase the rigidity of the diaphragm.
However, naturally the thicker the wall, the heavier the problem. An object of the present
invention is to obtain a diaphragm which is light in weight and large in rigidity. [Means for
Solving the Problems] In the case of the present invention, by forming a thick-walled reinforced
portion only on a specific portion from the central portion to the peripheral portion of the
diaphragm, the increase in overall weight is suppressed as much as possible. While making the
rigidity of the diaphragm thick (to take it. [Operation] The diaphragm according to the present
invention can increase its overall rigidity without increasing its weight so much due to the
presence of the thick-walled reinforcement in the central portion transferred from the
predetermined mold. An embodiment of the present invention will be described below. That is, in
FIG. 1, (2) is a predetermined mold prepared for the adhesion molding of the diaphragm port,
and (3) is a groove radially provided from the center to the periphery of the top surface of the
mold. . Metal Berylum to the surface of the mold (2) above. On the back surface of the diaphragm
+11 formed as shown in FIG. 2 by adhesion or deposition of a metal material such as boron as
shown in FIG. 2, the thick reinforced portion (1a) extends from the central portion to the
peripheral portion. It will be simultaneously molded by the transfer from (2). FIG. 3 shows
another embodiment of a mold used for coating and forming the diaphragm of the present
invention, in which not only radial grooves but also circumferential grooves are combined
therewith to make them. It is done. FIG. 4 shows another embodiment in which the above groove
is formed in a star shape. Further, FIG. 5 shows another embodiment in which a plurality of
elliptical grooves are combined in a crossing state. Although the groove (3) in each of the abovedescribed embodiments has a concave shape, it may be a ridge (4) as in the other embodiments
of FIG. 6 and FIG.
Although the diaphragm is dome-shaped in the above embodiment, it may be cone-shaped as in
the other embodiment of FIG. Since the diaphragm of the speaker unit according to the present
invention is configured as described above, the thick-walled reinforced portion transferred from
the mold used is formed at the same time as the molding at the center of the diaphragm. As a
result, this has the effect that a relatively lightweight and generally rigid diaphragm can be made
very easily.
Brief description of the drawings
FIG. 1 is a perspective view showing an embodiment of a mold for producing a diaphragm
according to the present invention, and FIG. 2 is a vertical view of the mold and the diaphragm
showing a deposition state of the diaphragm on the mold. Sectional views, FIG. 3, FIG. 4, FIG. 5,
FIG. 6, and FIG. 1 are perspective views showing other embodiments of the mold used in the
present invention, and FIG. 8 (a) (b) (Iii) is a partial cross-sectional view showing a manufacturing
process of a conventional diaphragm.
In the figure, 111 is a diaphragm, (Ia) is a thick-walled reinforced portion, and (2) is a mold.
Figure 1
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