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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
edge for a speaker, and more particularly to an annular edge for supporting an outer peripheral
portion of a diaphragm.
Background of the Invention Cloths, paper, films, soft urethane foams, etc. are used as the normal
speaker edge, and further, those obtained by impregnating these with synthetic resin, or rubber
elastic bodies are used. It is used after being formed in a predetermined shape. That is, basically,
a material formed in a sheet shape is provided with asperities by press processing, and is cut into
an annular shape to be used as an edge.
As a function required for the edge of the speaker, it can be mentioned that it is lightweight and
has good linearity with respect to the input signal. However, although it is the rubber material
that the linearity is good among various materials, it is a major disadvantage that it is heavier in
weight than other materials. For this reason, although a rubber edge is useful as an edge of a low
frequency speaker, it is not preferable as a medium and high frequency sound and a full range
In particular, in the case of urethane foam, a permanent press is applied by heat pressing to set
the specific gravity to about 0.5, but since it is an open cell, there is a problem with water
repellency, and weather resistance Sex is also not particularly good. In addition, since the edge
using a rubber material is heavy as described above, it is necessary to enlarge the magnet of the
magnetic circuit as a means to increase the sound pressure level, which causes a cost increase.
The present invention was devised in view of these problems, and in view of the material, it used
a foamed rubber which is light in weight, excellent in water repellency, excellent in weather
resistance and good in sound quality. It provides an edge.
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
provides an edge of a speaker having the following configuration.
That is, the present invention is an edge that surrounds the periphery of a speaker, and is
characterized in that a foaming agent is compounded in a rubber material and this is foamed at
the time of heat molding to form fine cells in the rubber, Is a speaker rubber edge having an
apparent specific gravity of 0.3 to 0.9.
The present invention is a rubber edge for a speaker having the above constitution, which not
only has the water repellency and weather resistance of the material but also reduces the weight
and cost as the edge. It is a matter of course. In particular, in the rubber edge in which fine air
bubbles are formed in the rubber of the present invention, the linearity with respect to the input
signal (vibration) is good, and hence it is possible to provide a speaker with excellent sound
quality. It is a thing. Incidentally, although the apparent specific gravity of rubber is lowered by
foaming, a range of 0.3 to 0.9 is provided for use, preferably a range of 0.4 to 0.7 can obtain
particularly good sound quality. It will be.
The rubber material is not particularly limited, and an inorganic foaming agent or an organic
foaming agent is used as the foaming agent to be compounded. For example, sodium bicarbonate,
nitroso compound, azo compound, sulfonyl hydrazide Etc. Among them, an organic blowing
agent that releases nitrogen gas, which forms a fine closed-cell rubber edge, is preferable.
The edge of the present invention will be described in more detail with reference to the following
examples. FIG. 1 is a plan view of the present invention, and FIG. 2 is a cross-sectional view taken
along the line A-A. In the figure, 1 is an edge, 2 is an annular portion, 3 is an inner edge attached
to the vibrating portion of the speaker, and 4 is an outer edge for attachment to the airframe. In
this example, the outer edge 4 for attachment to the airframe is 1 mm thick and the inner edge 3
attached to the annulus 2 and the vibrating part of the speaker is 0.2 mm thick. The inner edge 3
is preferably bent so that the foremost end portion 31 can be easily attached to the vibrating
portion, as shown. The edge 1 is made of a rubber material in which fine closed cells are
contained in an apparent specific gravity of 0.4.
Such a rubber edge 1 is light in weight, water repellent and weather resistant, and of course, it
has sufficient linearity with respect to input signals, so it is sufficiently used for a full range
speaker. It has become a thing.
Industrial Applicability The present invention is a rubber edge for a speaker in which fine closed
cells are contained in a rubber, which is a high-sensitivity full-range speaker with high weight
and excellent linearity of the vibration system. In the case where the same sound pressure level is
obtained as compared with the conventional speaker edge, the cost reduction of the magnetic
circuit becomes possible.