JPH0654395

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DESCRIPTION JPH0654395
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
free edge which is formed of a material different from a speaker edge, specifically, a material
different from a diaphragm, and which is attached to the outer peripheral edge of the diaphragm
by an adhesive or the like. It relates to the called speaker edge.
[0002]
2. Description of the Related Art Since an edge which is a part of a suspension of a diaphragm
has a function as a spring, it is usually formed using a soft material so that the amplitude can be
taken up and down. Since the frequency characteristics as stiffness are not uniform, natural
vibration is likely to occur in the mid-range region, which tends to cause reverse resonance.
Therefore, various attempts have been made to select the edge shape and the edge material with
a large loss, as a means for preventing reverse resonance of the edge.
[0003]
In order to achieve the above object, for example, as shown in JP-A-61-276499, the roll portion
has a V-shaped groove and the width thereof is Forming a thin film as shown in Japanese Utility
Model Application Laid-Open No. 62-8793, by forming an edge having high linearity with respect
to amplitude by forming the depth almost unchanged from the innermost circumference to the
outermost circumference In order to improve the sound quality of the speaker, many have been
proposed, in which polyhedral ribs composed of a large number of triangular faces are
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alternately arranged in the direction from the inner peripheral edge to the outer peripheral edge.
[0004]
However, since these edges are all complicated in shape, they are not easy to form, which causes
an increase in cost in speaker manufacture and has problems to be solved such as not always
leading to improvement in sound quality. It was
[0005]
SUMMARY OF THE INVENTION In view of the current situation, the present invention aims to
provide a speaker edge which is extremely easy to form and which does not cause natural
vibration.
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, the speaker edge of this
invention is formed of an elastic body made of urethane foam or synthetic rubber, and the whole
of the roll portion is arc-shaped in cross section. Irregularities are randomly formed on the
periphery.
[0007]
In the present invention, the material constituting the edge is an elastic body, particularly
preferably an elastic body such as urethane rubber or butyl rubber having a small stiffness, or a
foamed synthetic resin such as urethane foam.
Moreover, the uneven ¦ corrugated ¦ grooved part formed in a roll part with an arc-shaped cross
section has nothing to do with the front and back of a roll part, and the directionality is not
limited at all either.
[0008]
[Operation] The speaker edge of the present invention has irregularities randomly formed on the
roll portion having an arc-shaped cross section regardless of the direction or front and back, so
the linearity is improved and reverse resonance occurs. Performance of the speaker is improved.
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[0009]
An embodiment of a speaker edge according to the present invention will be described below
with reference to the accompanying drawings. In the present invention, the speaker edge 1 has a
diaphragm on the inner peripheral side of the roll portion 2 having an arc-shaped cross section.
An entirely free ring type ring-shaped urethane rubber with a small stiffness, which has a joint 2b
to join the joint 2a with the outer rim and the edge mounting part formed on the frame of the
speaker on the outer rim side. Molded with an elastic body such as
Thus, in the roll portion 2 formed in the circular arc shape (in the embodiment, the cross section
is an inverted U-shape), as shown in FIG. 1, the concave portions 3 and the convex portions 4 are
randomly distributed over the entire circumferential direction. It is formed.
The concave portions 3 and the convex portions 4 can be easily formed by means of, for
example, a heat press or injection molding when forming the edge, and in the case of the roll
portion 2, the back side even if it is the front side There is no limitation on the directionality.
[0010]
According to the present invention, since the speaker edge according to the present invention
has irregularities randomly formed over the entire circumference of the roll portion having an
arc-shaped cross section, so-called edge resonance hardly occurs and a straight line with respect
to the amplitude of the diaphragm The speaker performance is significantly improved, the
characteristic vibration is small even in the middle and high range, the deterioration of the sound
quality due to the occurrence of subharmonics, the malfunction of the voice coil and the like are
eliminated, and the performance characteristics of the speaker are improved. it can.
In particular, since the speaker edge of this invention is formed on the entire circumference of
the roll without any limitation on the front and back or the direction, the formation of the edge
can be extremely easily and easily performed. Since the unevenness formed on the roll portion
also serves as a rib, the rigidity of the edge is also improved, so that it has many practical
advantages.
[0011]
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Brief description of the drawings
[0012]
1 is an enlarged perspective view of the main part of the speaker edge of the present invention.
[0013]
Explanation of sign
[0014]
1 speaker edge 2 roll 3 concave 4 convex
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