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JPH0287899

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DESCRIPTION JPH0287899
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm applied to various acoustic devices. 2. Description of the Related Art In recent
years, an edge is used in a speaker diaphragm to balance and support a portion interposed
between a cone peripheral portion which is a sound wave source and a frame which is a support
thereof. A conventional loudspeaker diaphragm of this type will be described below. FIG. 6 is a
plan view showing a schematic configuration of a conventional speaker diaphragm. 6 is a
partially cutaway cross-sectional view taken along the line AB in FIG. In these figures, 1 is a cone
joint portion bonded and joined to a cone 6, 2 is a frame joint portion bonded and joined to a
frame (not shown) of the same speaker, 3 is a warp of a fiber, and 4 is a fiber of the same The
weft yarn 6 is an edge formed of a roll-shaped formed fiber knitted with each other by the warp
yarn 3 and the weft yarn 4. The operation of the speaker diaphragm configured as described
above will be described below. First, the cone 6 vibrates up and down in the direction of the
arrow C by the voice coil driven according to the electrical input signal. Then, the edge 6 formed
in a roll shape vibrates in response to the vertical vibration of the cone 6 and supports the
peripheral portions of the cones and the like. According to the configuration to be solved by the
invention, however, the flexibility is different with respect to the central portion drive point C of
the scycon ? depending on the warp 3 and the weft 40 in the knitting direction. Especially warp
3. The flexibility in the direction of the arrows, which differs by approximately 46 ░ from these
directions, is significantly different from that in the weft 4 direction. As a result, vibration
distortion of the cone 6 is generated and the sound quality is deteriorated. The present invention
is intended to solve the above-mentioned conventional problems, and it is an object of the
present invention to provide a speaker diaphragm having uniform flexibility in the radial
direction to which vibration waves are transmitted and capable of preventing the occurrence of
vibration distortion. [Means for Solving the Problems] In order to solve the problems described
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above, the present invention is characterized in that the first material radially disposed and the
edge formed by molding the second material substantially orthogonal to the first material are
cones It is connected to the peripheral part of In the present invention, since the first material
and the second material are formed into a molded material according to the above-described
configuration, the flexibility in the radial direction, which is all the transmission directions of the
vibration wave, becomes uniform and the vibration strain is generated. By holding the pressure
low, it is possible to prevent the occurrence of vibration distortion. Embodiment An embodiment
of the present invention will be described with reference to the drawings. FIG. 1 is a plan view
showing a schematic configuration of a speaker diaphragm in an embodiment of the present
invention. 2 is a partially cutaway cross-sectional view in the direction of arrows E of FIG.
In these figures, 11 is a cone joint joined and joined to the cone 12, 13 is a frame joint joined and
joined to the frame, 14 is a warp of fiber, 16 is a weft of fiber, 16 is a warp 14 and a weft 16 And
an edge formed of rolled shaped fibers knitted with each other. A process of manufacturing the
edge 16 of the speaker diaphragm according to the embodiment configured as described above
will be described. In FIG. 3, a plurality of warp yarns 14 are disposed in the central axis direction
of the cone 12, and a plurality of weft yarns 16 are disposed concentrically with respect to the
central axis, and knitted in a bellows shape. Under the present circumstances, the constriction
part 17 is made into the internal diameter of the cone | corn junction part 11, and the largest
outer diameter part is restrict | limited to the diameter equivalent to the edge largest outer
diameter. Next, the portions shown by broken lines in FIG. 4 are sequentially cut. Then, the
obtained knitted and formed woven material is impregnated with a resin such as phenol and the
like, and then heat-formed to obtain an edge 16 having a cross-sectional roll shape. As described
above, according to the present embodiment, such a knitted and formed woven material can be
easily produced in a large amount with little loss. Next, the photographing operation of the edge
16 obtained in this way will be described. In FIG. 2, when the voice coil vibrates up and down in
the direction of the arrow C, the cone 12 vibrates up and down in response to the voice coil. On
the other hand, in FIG. 1, the warp yarns 14 of the edges 16 provided in the radial direction and
the weft yarns 16 provided concentrically are mutually knitted. Therefore, it has uniform
flexibility in all directions of transmission of the vibration wave, and distortion in vibration can be
suppressed low. In the present embodiment, although the edge 16 is in the form of a roll, it may
be in the form of another shape, such as a corrugated or grooved roll, for properly supporting
the cone 12 in a balanced manner. As the material of the warp 14 and the material of the weft
16, it is possible to use a weatherproof material like cotton, chemical fiber or the like, or it is also
possible to use materials of the same quality and the same diameter as the warp 14 and weft 16
For the purpose of performance improvement, different materials as well as fiber materials of
different diameters can be used. EFFECTS OF THE INVENTION As apparent from the above
description, according to the present invention, in order to form the first material and the second
material in order, it has uniform flexibility in the radial direction of the forming material. And the
generation of distortion due to vibration can be prevented.
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[0002]
Brief description of the drawings
[0003]
1 is a plan view of a schematic configuration of a speaker diaphragm according to an
embodiment of the present invention, FIG. 2 is a partially cutaway sectional view taken along line
2-F of FIG. 1, and FIG. FIG. 4 is a schematic front view of the same. FIG. 6 is a plan view of a
schematic configuration of a conventional speaker diaphragm.
6 is a partially cutaway cross-sectional view taken along the line Mu-B in FIG. 11 и и и и и и и и и и и и и и и
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и и и и и и и ... .... Figure
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