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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the speaker according
to the present invention, and FIGS. 2 and 3 are perspective views of a reinforcing ring 2. 1 is a
diaphragm, 2 is a reinforcing ring, 3 is a window.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the structure Q at the
periphery of the diaphragm of a loudspeaker having a honeycomb diaphragm. This invention will
be described with reference to the embodiment shown in the drawings. The magnetic circuit
shown in FIG. 1 is formed in the same way as the conventional example, and the frame 5 is
attached to the upper surface of the plate The center part of the flat plate 2 moving plate l with a
honeycomb structure is attached to the upper end of the north voice coil 6, and the peripheral
part of the plane diaphragm 10 and the frame 5 made of light materials such as paper and
aluminum. Both ends of the edge 70 with an arced cross-section that protrudes outward or
inward between the outer edge and both ends of the edge 70 are stuck and inserted in the
direction of vibration · · · Edge of the peripheral edge of diaphragm l of diaphragm structure l
There is a drawback that it absorbs moisture and warps and deforms. This device has a structure
in which a lightweight metal thin plate made of aluminum or the like having a U-shaped cross
section is fitted to the outer periphery of the diaphragm 1 and a reinforcing ring 2 made of
synthetic resin is fitted and fixed. With such a structure, it is possible to prevent the hygroscopic
deformation of the diaphragm 1 and to increase the rigidity of the diaphragm 1. The weight of
the reinforcing ring 2 can be further reduced by punching out the window 8 within the range of
strength as shown in FIG. By forming a reinforcing ring 2 by bending a thin thin metal foil as
shown in FIG. 8 and forming a reinforcing ring 2 as shown in FIG. 8, a ring which can be made
lightweight and strong can be obtained. 3