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JPH0550895

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DESCRIPTION JPH0550895
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
elliptical speaker using a partially soft material as a gasket for holding an edge portion of a
diaphragm.
[0002]
2. Description of the Related Art Conventionally, an elliptical speaker of this type has a voice coil
(8) suspended in an annular magnetic air gap (7) of a magnetic circuit (6) as shown in FIGS. The
edge (2) of the diaphragm (1) attached at the center is stuck and held on the outer edge of the
frame (5) of the oval outer shape. Gasket (3) which holds the edge part (2) of the outer peripheral
part of the diaphragm (1) from above and affixes it to the frame (5) is usually made of cardboard,
rubber or plastic, and the diaphragm (1) The edge portion (2) is pressed and fixed, and it is
directly attached to the frame (5). And, in this frame (5), there is a restriction that the area for
attaching the short diameter side gasket (3) can not be taken large.
[0003]
Accordingly, in the conventional elliptical speaker of this type, when the diaphragm is formed
and formed, stress remains due to the tensile force generated at the edge portion, and therefore,
the edge is produced. There was a problem that the part and the gasket peeled off. Also, in such
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an elliptical speaker, the projection with a particularly small radius of curvature at the edge
portion (2) of the diaphragm is also firmly fixed at the top and the bottom and is thus restrained.
The problem is that it does not absorb vibration energy, but resonates to generate chattering
noise.
[0004]
Therefore, the present invention aims to suppress the resonance of the edge portion (2) in order
to solve the problems of such a conventional elliptical speaker, and It is an object of the present
invention to provide an elliptical speaker which can suppress the occurrence.
[0005]
SUMMARY OF THE INVENTION The structures of the first and second inventions for achieving
the object will be described with reference to FIGS. 1 to 4 corresponding to the embodiments. In
the device, the edge part (2) of the diaphragm (1) is pasted with a hard gasket (3a) made of
conventional paper or the like on the upper side, and a gasket (3b) made of a relatively soft
material such as foamed polyurethane on the lower side. ) Is pasted and sandwiched, and a
conventional hard paper gasket or the like (3c) is laid on the lower side of the same and attached
to a frame (5).
[0006]
According to the second aspect of the present invention, in the gasket (3a) attached to the upper
side of the edge portion (2) of the diaphragm (1), both ends of the central vibration portion (1a)
of the diaphragm (1) are protruded. Only the near part (3a ') and (3a') of the part is formed of a
relatively soft material such as foamed polyurethane, and the other parts (3b ') and (3b') are
made of a hard material such as conventional paper. The upper gasket (3a) and the lower gasket
(3c) are elliptical speakers attached to the frame (5) by being sandwiched by the lower gasket
(3c) made of a hard material such as conventional paper. .
[0007]
In the elliptical speaker according to the present invention, the edge portion (2) of the diaphragm
(1) is thus provided with gaskets (3a), (3), which have different properties in the upper, lower,
whole or part. Since it is configured to be sandwiched between 3b) and attached, the resonance
force of the edge portion (2) can be absorbed and it can be made vibrationally soft.
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As a result, the chattering noise generated from the edge portion (2) can be eliminated and the
reproduction sound quality can be improved.
[0008]
Embodiments of the present invention will be described with reference to the drawings.
In the drawings, FIGS. 1 and 2 show an embodiment of the first invention, wherein FIG. 1 is a
plan view and FIG.
In the first aspect of the present invention, (2) is an edge portion of the diaphragm (1) and is
sandwiched by two types of gaskets (3a) and (3b) on the upper and lower sides. Thus, the upper
gasket (3a) is a conventional hard gasket such as paper, and the lower gasket (3b) is formed of a
relatively soft material such as foamed polyurethane, and further, a hard conventional gasket is
provided therebelow. It is an elliptical speaker pasted on the frame (5) by laying (3c).
[0009]
According to the second aspect of the present invention, in FIGS. 3 and 4, of the gasket (3a)
attached to the upper side of the edge portion (2) of the diaphragm (1), the central vibration
portion (1) of the diaphragm (1) Only the portions (3a ') and (3a') in the vicinity of the end
projections of 1a) are formed of a relatively soft material such as polyurethane foam. The other
parts (3b ') and (3b') are the upper gasket (3a) made of hard material such as conventional paper,
and the lower gasket (3c) made of hard material such as paper on the lower side. It is an elliptical
speaker stuck on a frame (5) by being sandwiched by.
[0010]
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-mentioned 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.
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[0011]
As already apparent from the above description, the elliptical speaker of the present invention is
thus capable of vertically and partially or fully up and down the edge portion (2) of the
diaphragm (1). In this structure, the gaskets (3a) and (3b) having different properties are
attached to each other so that the resonance force of the edge portion (2) can be absorbed, and
the vibration can be softened. , Brake the vibration force.
As a result, it is possible to expect the remarkable effect in practical use that the rattling noise
generated from the edge portion (2) can be eliminated and the reproduction sound quality can be
improved.
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