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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view showing an embodiment of a flat
diaphragm for a speaker according to the present invention, FIG. 2 is a cross sectional view
thereof, and FIG. 3 is a cross section showing an assembly schedule at the time of attaching the
same edge FIG. DESCRIPTION OF SYMBOLS 1 ···· Core, 2 ··· Face plate, 3 ··· Face plate, 4 · · · · · · · · ·
· · · · Adhesive.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a flat diaphragm for a speaker which comprises a face plate attached to both sides of a
honeycomb structure core and an edge attached to the periphery thereof. Recently, in place of
cone type diaphragms, a flat plate with excellent directivity has been developed and put to
practical use. This flat diaphragm is made of metal foil or organic material sheet-and cone--Metal,
resin, paper on both sides of the core of nikam structure! The surface material of I eta 9 9 (1 2 l
2 2 material was pasted and constituted. An edge is attached to the peripheral edge portion of
such a configuration to form a flat diaphragm for a speaker, but in order to uniformly bond the
bonded portion of the edge, it is necessary to press the bonding portion. About this
pressurization, a delicate adjustment of the pressure is required, and if the pressure is a little too
strong, the diaphragm is deformed. It was considered to be technically difficult because of the
cause of the destruction. The present invention seeks to eliminate the above-mentioned
conventional drawbacks. Hereinafter, an embodiment of the present invention will be described
with reference to FIGS. 1 to 3. A core 1 is formed in a honeycomb shape using a sheet of a metal
foil such as aluminum or an organic material, and upper and lower surfaces of the core 1 are
adhered with surface plates 2 and 3 such as metal foil, synthetic resin sheet and paper sheet It is
combined. The surface plate 2 on the upper surface of the surface plates 2 and 3 is formed larger
in diameter than the core 1 and the surface plate 3 on the lower surface, and three peripheral
edges of the surface plate 2 project to the outer periphery of the core 1. An edge 4 is attached by
an adhesive 5 to the peripheral edge of the upper surface plate 2. As shown in FIG. 3, in the
process of attaching the edge 4, as shown in FIG. 3, the surface plate 3 of the lower surface and
the four portions 6 for fitting the core 1 are provided at the center, and the height of the
peripheral wall 7 forming the recess 6 is 3 and a jig 9 having a recess 8 in which an edge 4 is
fitted on the outer periphery of the peripheral wall 7 while making the total height of the core 1
equal to the total height of the core 1 and making contact with the lower surface The bonding
portion is pressed by a pressing plate 10 having a disk shape and pressing the bonding portion
of the surface plate 2 and the edge 4 at the peripheral edge portion, and bonding bonding is
carried out uniformly over the entire circumference. As described above, even if the pressure is
high by the pressure plate 10, even if the pressure is large, it is absorbed by the peripheral wall 7
and the core 1 and the surface plate 2.3 do not deform, and the quality can be made extremely
high. it can. As described above, since the dry plate diaphragm for a speaker according to the
present invention is j5-shaped, the edge can be firmly attached, so that it can prevent busy
deformation and breakage, and also prevent the occurrence of defects due to adhesion failure. It
is a dog of practical value that can be made reliable and of high quality.