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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a speaker diaphragm according
to the present invention, and FIG. 2 is a graph showing an example of the characteristic of the
speaker diaphragm according to the present invention. Explanation of symbols of main parts, 1
..... Speaker diaphragm 2 ..... Center hole, 3 .... Outer rim, 4, 5 ... Corrugation.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
diaphragm. A cone-shaped dynamic speaker is provided in a magnetic field and vibrates in
response to an audio current. And includes a rar-like diaphragm. 1pts:Jyで+。 When
such a diaphragm is driven by a voice coil, split vibration occurs or high frequency distortion
occurs due to abnormal resonance in a high frequency region. In order to suppress such an
undesirable phenomenon, it is practiced to provide a fold, a convex or a concave (hereinafter
referred to as "corrugation") in the circumferential direction of the cone. There are also those in
which corrugations are provided radially. But you do not have such corrugations. It is difficult to
say that even the 4 ゝ pure γ-n was able to sufficiently suppress the divided vibration or the
high frequency distortion. Therefore, an object of the present invention is to provide a speaker
diaphragm having a structure in which division vibration or harmonic distortion is sufficiently
suppressed. Hereinafter, the present invention will be described in detail with reference to the
drawings. FIG. 1 shows an example of a speaker diaphragm according to the present invention.
The speaker diaphragm 1 has a frusto-conical shape and is provided with a central hole 2 at the
central top, and a voice coil (not shown) is fixed to the central hole 2. The outer peripheral edge
3 of the speaker diaphragm 1 is attached to the frame (not shown) of the speaker via an edge
(not shown). As a material of the speaker diaphragm 1, various materials such as paper can be
considered. The loudspeaker diaphragm 1 according to the invention is characterized in that it
crosses with a plurality of radial corrugations 4 and a circumferential at least one annular
corrugation 5. The number of corrugations 4 and 5 or the width or length of each corrugation
should be determined by taking into account the material of the speaker diaphragm J (2) and the
size of the body (size of the body; It is selected accordingly. FIG. 2 shows load-displacement
characteristics of the speaker diaphragm. The solid line A shows the load-displacement
characteristic of the speaker diaphragm of the present invention, and the dotted line B shows the
load-displacement characteristic of the conventional speaker diaphragm without corrugation. C
shows the load application method. The speaker diaphragm 1 is placed on the base 6 and a load
is applied to the upper outer periphery [a, and the displacement to be compressed in the D
direction is measured. As is apparent from this figure, in the speaker vibration λ-vi 6-force q-tar
plate of the present invention, the corrugation increases the strength and 12 ′ ′ 1 stiffness of
the falcon 7 in the piston motion range and the divided vibration range It is thought that the
amount of characteristics is improved, and since 巳, collegineon 4 and 5 act complementarily.
It is also considered to be. r / l /) y'-73, 1011 o'clock. q、・−1i。 It is possible to provide a
shape, or to fix the convex members by bonding or the like, or to use a compression mold at the
time of 2 'press molding to crimp. Even if the speaker diaphragm has a conical shape or a disk
shape, the effect of corrugation is similarly exhibited by the fork 4 (3). The speaker diaphragm
according to the present invention has high strength and rigidity by the synergy of the
corrugations 4 and 5 which cross each other, prevents division vibration in the high range 1 to a
flat characteristic without peak step, and the conventional cone Can be made thinner and lighter.
As a result, efficiency improvement as a speaker is achieved. Also, as a result of the increase in
strength and rigidity, the linearity of the low region can be improved, and the merchant caspy
force can be obtained for a small caliber. Furthermore, the lowest resonance frequency can be
lowered, and the reproduction band is broadened. Therefore, by providing the corrugation as in
the present invention, the effect of increasing strength and rigidity is great.