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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 show an embodiment of the present
invention, in which FIG. 1 is a longitudinal side view and FIG. 2 is a front view. FIG. 3 is an
explanatory view of various ribs, FIG. 4 shows another embodiment of the present invention, FIG.
3A is a longitudinal sectional side view, and FIG. 1 ... reflective surface, 3 ... reinforcement rib 0.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a thermosetting resin # diaphragm of a loudspeaker which is formed by moistening a
thermosetting resin such as phenol resin onto a cloth. The f / brake plate in the prior art is flat in
the upper and lower molds to form a dome-shaped reflecting surface by bending it in upper and
lower molds to form a dome-shaped reflecting surface 211) The center of the dome-shaped
reflecting surface It was not possible in production to make the section thinner and weaker than
the other sections. Therefore, if it is used for the j & near request, adult speaker of 6s heightened,
it will be thinner in production. It became an outbreak cause. The object of the present invention
is to provide a thermosetting resin diaphragm of a loudspeaker that can reinforce the central
portion of the reflecting surface, which is weak in production, to prevent the generation of
abnormal noise and improve the performance. The embodiment shown in FIGS. 1 and 2 will be
described as follows. In the figure, l is a dome-shaped reflecting surface, 2 is an annular ridge
around it, 3 is a radial reinforcing rib integrally provided at the center of the back surface of the
reflecting surface l, and this rib 3 is made of phenolic resin At the same time, when forming a flat
resin plate, it is integrally formed at a predetermined position in the central portion in the
direction of [l 1 Qf] by the mold at the same time τ. The scissors are cylindrical coil winding
members, and the coil winding members are adhered to the spine around the reflection 1 j [I /.
Now, even if a large sound pressure is applied to the reflection an / due to a large input, the thin
central portion is reinforced by the rib 3 and is not distorted. Moreover, it is necessary to
reinforce (3) all over the reflective surface / (2), and partially and effectively reinforce by the rib
3 so that the overall weight increase is small and the diaphragm weight is There is no such thing
as a performance increase due to a significant increase. In consideration of the shape of the rib 3,
it is also possible to reinforce only the resonance portion by the specific wave number, and
therefore it is possible to exhibit high performance as a whole. As shown in FIG. 3, the shape of
the rib 3 in the above embodiment is a shape consisting of several concentric circles of a large
and a small scale, a mouth swirl shape, and a combination shape of a circle and a straight line Of
course what can be done. In the above embodiment, since the ribs 3 are integrally formed in
advance integrally when the reflecting surface 1 is flat, the work of rib formation is extremely
easy, and moreover, the ribs 3 have a reflection direction 7 There is no shadow on the reflecting
surface due to the position of the rib 3 because the position of the rib 3 is located at a fixed
position without causing any positional deviation.
Next, in another embodiment shown in FIG. 5, a circular phenol resin plate 5 having a size
enough to cover the central portion is attached to the back of the central portion of the anti-tack
(4 ') l to reflect it. It is very convenient when the central part of the surface is reinforced and later
reinforced with respect to a conventional product which has already been heat-formed into a
dome shape. In the present invention, as described above, a reinforcing portion for preventing
distortion of the diaphragm due to a large input is provided on the surface opposite to the sound
radiation direction of the diaphragm Dl et al. Even if it is added, it does not distort like a
conventional one, and does not generate an abnormal sound etc. Therefore, even if this is used
for a large-input expander, it is a good candidate to exhibit high performance. ス、−・