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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view of a
speaker diaphragm of the present invention, FIG. 2 is a plan view of a core material used for the
diaphragm of the present invention, and a third is a diaphragm of the present invention. Fig. 4 is
a cross-sectional view of a loudspeaker using Fig. 4 is a frequency characteristic diagram of this
loudspeaker, in which 1 indicates a core plate and 2.2 indicates a skin material.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
diaphragm, and more particularly to a SUBY * ysmm board useful for planar speakers. The
existing speakers are cone-shaped speakers, most of which have a conical imaging plate, but this
speaker has a cavity effect caused by a recess formed on the @ surface of the conical diaphragm
1 It has the disadvantage of disturbing the wave number characteristics. As a disadvantage that
can be overcome and prayed, a flat-type sby il having a plano-concave diaphragm is being
realized. This flat loudspeaker company overcomes the above drawbacks / 7. Although there is
an advantage that the speaker itself can be made thin together with the p-5 speaker 22, a flat
diaphragm of the speaker is required to be made of a material having a large bending rigidity as
compared with that of the cone type speaker. Among flat diaphragms that satisfy the essential
requirements, there is a diaphragm having a NAND-like tee structure in which both surfaces of a
plate-like core material are sandwiched by skin materials, and its effectiveness has been
recognized. It is obtained by the following equation of flexural rigidity D # i of this German die
structure. Q1 W zt * (t L + t *) D mass □--2 ..... 2Q 1 + 24 m dew 5 s (tl + t J where OA: shear
modulus of core material 1 bird: Young's modulus of surface material tl: thickness of core
material 1 *: * Enjoyment of the skin material In order to increase the bending rigidity of the fine
structure in Chin German Chichi clearly evident from the above equation, for the core material, a
large one of shear modulus G1 and enjoyment tL, ie, It is preferable to use a large material with
small thickness and small Iff deformation to stress. 豐 ド S ツ 豐 which used core material which
satisfies such 1 case. II As a flat diaphragm manufactured by Nitto Denko Co., Ltd., a foam metal
diaphragm made of a foam obtained by foaming a metal such as nickel as a core material to a
foam metal diaphragm made of aluminum etc. Although there is a vibrating plate, these moving
plates are expensive because the structure of this core material is complicated and a special
manufacturing technology is required for 1.4. The present invention has been made in view of
the circumstances, and provides a diaphragm for a nine speaker using a novel core material. Onepart FIG. 1 shows the speaker diaphragm 1 of the present invention. FIG. 2 shows a partially cutoff slant and winding, and FIG. 2 shows the diaphragm for the speaker. The top view of the core
material is shown. In these figures, (1) is a core formed by tapping and waving a plurality of
bending lines at equal intervals, and the material is light metal, such as aluminum, polyester
plastic, etc. A material having rigidity is selected. When aluminum is used as the core material
(1), a core material having a desired density can be obtained only by press-forming the aluminum
thin plate into the shape described above.
j2D2) is a surface material coated with an adhesive on both surfaces of the core material (1), and
is, for example, an aluminum sheet, and it is combined with the core material tl) to form a
diaphragm having a large bending rigidity Is one. 14. In this example, a core material having a
square wave waveform is used, but it is also effective to use a core material having a triangular
wave waveform or a sine wave waveform. In the speaker diaphragm formed in (1), the
corrugations of its core material are closely spaced to the center, and the bending rigidity of the
central portion is higher than that of the side portion. This is true for a general speaker whose
drive point is at the center of the diaphragm. FIG. S shows a speaker used as the abovementioned strike Ia optical board. The same figure KM! 3) is a magnetic E1 path, which
comprises a bottom plate (5) having a center pole (4), an annular magnet (6) and a top plate 7),
the center ball 14) and the top plate (7) A magnetic gap is formed at the same time. (8) l'i The
diaphragm of the nan Germanicchi constitution according to the present invention, (9) is a voice
coil disposed in the magnetic gap of the above magnetic 1st magnetic path (3), the diaphragm via
the driver @ It is connected to 8) and wound around the lower end of nine coil bobbins 5711 m.
tts # i coil (5)-a damper for holding a bobbin, a frame that is engaged with U # i above-1 aui +
town, and the diaphragm (8 through the edge a4 · k − · · · at its opening. Supports the periphery
of ・ “FIG. 4 is the same wave number characteristic diagram for the 50 a = aperture low-range
speaker composed of the coupling as described above, and a very flat output is obtained from
around 5QHg to around 1KMm . In the above description, a flat [iii diaphragm has been
described as the speaker diaphragm of the present invention, but the speaker diaphragm of the
present invention having high bending rigidity at @ is effective even when used for a general
cone type diaphragm It is. As is apparent from the above description, the speaker diaphragm
according to the present invention has a wave-formed plate whose radial bending line is a core
material and a skin material is attached to the corrugated material so that the core material is
formed easily. Since it is not used, it is possible to obtain a low density and high bending rigidity
without anisotropy, and it is possible to realize a speaker excellent in the same wave number
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