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JPH0550893

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DESCRIPTION JPH0550893
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
elliptical speaker in which the shape of the outer peripheral edge of the diaphragm is improved.
[0002]
2. Description of the Related Art In the conventional elliptical speaker of this type, as shown in
FIG. 4, the outer peripheral shape of the edge portion (2 ') of the diaphragm (1') is the outer
periphery of the central vibration portion (1b ') It is usually in a similar form to.
[0003]
Therefore, in the conventional elliptical speaker of this type, an edge portion (generated by the
vibration of the central vibration portion (1b ') of the diaphragm (1')) is generated. Since the
vibration mode of 2 ') differs in the major axis direction and the minor axis direction, the rate of
expansion in the major axis direction edge part (2a') having a large amplitude relative to the
minor axis direction edge part (2b ') The problem is that there is an imbalance of compliance
with vibration.
Furthermore, the up and down movement of the inner peripheral portion of the edge portion (2b
') causes a movement moving in the circumferential direction in the displaced portion of the edge
portion (2b') to generate a stress, and the stress is generated locally Has the disadvantage of
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causing distortion. In order to solve such problems, the width (height), curvature, etc. of the roll
of the edge (2 ') have been changed to absorb it, but none of them is sufficient. Nonuniform
distortion was generated.
[0004]
Therefore, in order to solve the problems of such a conventional elliptical speaker, the present
invention projects the shape of the edge portion (2) of the diaphragm (1) outward. (2a), (2b), (2c),
(2d) are formed, and the protrusions (2a), (2b), (2c), (2d) are further corrugated in the radial
direction (3), (2) 3), (3), (3), with the aim of achieving balance of compliance, and an ellipse
having a diaphragm (1) capable of making the vibration pattern in the direction of length and
short diameter uniform. It is intended to provide a shape speaker.
[0005]
SUMMARY OF THE INVENTION The structure of the present invention for achieving the object
will be described with reference to FIGS. 1 to 3 corresponding to the embodiments. The
protrusions (2a), (2b), (2c) and (2d) are provided outward at the four corner corners of the outer
edge portion (2), and the protrusions (2a), (2b) and (2c), (2d) is an elliptical speaker in which
corrugations (3), (3), (3) and (3) are formed in the radial direction.
[0006]
Since the present invention is configured as described above, the protruding portions of the edge
portion (2) of the diaphragm (1) to the outer side of the edge portion (2a), (2b) , (2c), (2d) can be
maintained, and further generated in the circumferential direction by corrugations (3), (3), (3),
(3) formed in the radial direction in that part. It is possible to absorb stress and maintain large
compliance, and as a result, it is possible to equalize the vibration mode in the long and short
diameter directions of the diaphragm (1).
[0007]
Embodiments of the present invention will be described with reference to the drawings.
1 to 3 show an embodiment of the present invention, wherein FIG. 1 is a plan view, FIG. 2 is an
overall sectional view, and FIG. 3 is a partial sectional view.
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[0008]
Reference numeral (1) is a diaphragm, which has projections (2a), (2b), (2c), (2d) outward at four
corners of an outer edge portion (2) of the central vibration portion (1b). ) Is provided.
And, by forming corrugations (3), (3), (3), (3) in the radial direction on the protrusions (2a), (2b),
(2c), (2d), the vibration span is enlarged. .
And as for the cross section in the III-III line of FIG. 1, a corrugation (3) is formed in the mid-part
as shown in the cross section shown in FIG.
[0009]
Although the embodiments considered to be representative of the present invention have been
described above, the present invention is not necessarily limited to only the structure of these
embodiments, and includes the above-described components according to the present invention,
and In order to achieve the purpose of the present invention, the present invention can be
appropriately modified and implemented within the scope having the following effects.
[0010]
As is apparent from the above description, according to the present invention, the projecting
portions (2a), (2b), (2c) of the edge portion (2) of the diaphragm (1) are outward. ) And (2d) can
maintain the area margin of the edge portion (2), and further, by means of the corrugations (3),
(3), (3) and (3) formed in the radial direction in that portion, It is possible to absorb the stress
generated in the direction and maintain a large compliance, and as a result, it is possible to
expect the remarkable effect in practical use that the vibration form in the long and short
diametrical directions can be made uniform. It has been reached
[0011]
Further, the present invention, with the structure as described above, disperses and cancels the
overall resonance and stress of the edge portion (2), makes the partial stress of the edge portion
(2) to a large input uniform, The effect of preventing generation of noise such as sound and
absorbing the stress due to the extension of the edge roll generated from the short diameter
direction side, and preventing deformation of the edge portion (2) concentrated in the long
diameter direction is also expected. It is now possible to
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