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JPH0576096

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DESCRIPTION JPH0576096
[0001]
FIELD OF THE INVENTION The present invention relates to a speaker edge in an electroacoustic
transducer.
[0002]
2. Description of the Related Art As is well known, a speaker edge is provided between an outer
peripheral edge of a speaker diaphragm and a speaker frame, and has a function of supporting a
voice coil and a speaker diaphragm in a correct position together with a damper. .
[0003]
The performance required for the speaker edge is as follows: (1) To have a sufficiently high
compliance in the vibration direction of the speaker diaphragm so as not to prevent the vibration
of the speaker diaphragm.
(2) Sufficient rigidity for lateral movement of the speaker diaphragm to support the speaker
diaphragm in the correct position. (3) In particular, the linearity of the driving force-displacement
characteristic is good up to the large amplitude region in order to suppress the occurrence of
harmonic distortion in the low region.
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(4)
Do not cause edge resonance or inversion vibration that causes abnormal radiation.
(5)
Lightweight as a vibration system part.
[0004] In order to satisfy the above conditions, conventionally, a woven fabric impregnated with
a phenol resin as a shape imparting material to which an acrylic resin or the like is applied as a
vibration absorbing material, or a shape imparting material and a vibration absorbing material
comprising a thermosetting resin on a nonwoven fabric What apply | coated or impregnated
what was shape | molded etc. is used.
[0005] The conventional speaker edge having such a structure uses (1) a shape-providing
material to give rigidity to the speaker edge to support the speaker diaphragm in a correct
position. However, the rigidity of the shape-imparting material deteriorates with use of the
speaker, and the f0 of the speaker decreases, so that the initial performance can not be
maintained for a long time. In addition, the increase in cost and weight, the non-uniform
impregnation of the shape-imparting material, and the like tend to cause variations in quality. (2)
Since the porosity or thickness is not sufficient and the viscous drag of air due to the passage of
air is small, the speaker Q0 becomes large and a sharp peak is generated at f0 on its frequency
characteristics. There was a problem to be solved.
[0006]
Therefore, the object of the present invention is to provide a speaker edge capable of solving the
above-mentioned conventional example, eliminating the need for a shape-imparting material,
reducing the change with time, and sufficiently reducing the viscous resistance of air and
reducing the Q0 of the speaker. I assume.
[0007]
A speaker edge according to the present invention for achieving the above object is characterized
in that it is formed by heating and pressing a non-woven fabric using polyethylene terephthalate
fiber, and the polyethylene terephthalate fiber is characterized in that The non-woven fabric used
may be a non-woven fabric using a polyethylene terephthalate fiber bundle in which at least two
or more polyethylene terephthalate yarns formed by bringing together at least two or more
polyethylene terephthalate single fibers are bundled and this outer periphery is covered with a
urethane resin. .
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[0008]
In the speaker edge having such a configuration, crystallization by heat treatment of
polyethylene terephthalate proceeds by heating and pressing, so that hardness is increased, and
therefore no shape-imparting material is required.
As a result, it is possible to easily reduce the weight of the speaker edge or to increase the
thickness if the weight is substantially the same.
[0009]
Further, in the case of using a polyethylene terephthalate fiber bundle covered with a urethane
resin, the internal loss is greatly improved by the urethane resin, and the porosity is uniform and
large as a result of being made into a non-woven fabric in the structure. Viscous resistance of air
increases.
[0010]
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, an embodiment of the
present invention will be described in detail.
FIG. 1 is an explanatory view of the structure of the embodiment. In FIG. 1, 1 is a polyethylene
terephthalate (hereinafter referred to as PET) single fiber, 2 is a PET yarn, 3 is a PET fiber
bundle, and 3a is a urethane resin.
[0011]
Seven to eight PET yarns 2 in which PET single fibers 1 are put together are bundled, and the
outer periphery is coated with a urethane resin 3a to produce a PET fiber bundle 3.
A breathable non-woven fabric with a thickness of 0.5 mm in which the PET fiber bundle 3 is
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entangled is heated for 12 seconds in a mold heated to 180 ° C. with a roll edge shape with a
gap of 0.45 mm between the upper and lower molds. The speaker edge according to the present
invention can be obtained by compression molding, promoting crystallization, removing the
molded product from the mold, and cutting it into a predetermined shape.
[0012]
As mentioned above, although the speaker edge concerning the present invention was explained
in full detail based on the example considered to be typical, the embodiment of the present
invention is not limited to the above-mentioned example, but is stated in the above-mentioned
claim. The present invention can be appropriately modified and implemented as long as it has the
constituent features of the above, exhibits the action according to the present invention, and has
the effects described below.
[0013]
[Effects] Using the speaker edge having an inner diameter of 40 mm, an outer diameter of 68
mm and a roll height of 3.3 mm obtained in the embodiment, an external magnet dome speaker
is completed.
The frequency-output sound pressure and admittance characteristics are shown in FIG. Further,
as a conventional example for comparison, an external magnet dome speaker was completed
using the speaker edge obtained by molding in the same manner a PET woven fabric coated with
an acrylic resin absorbing material. The frequency-output sound pressure and admittance
characteristics are shown in FIG.
[0014]
As apparent from FIG. 2, the speaker edge according to the present application has a large air
flow resistance, which reduces the Q0 of the speaker and suppresses the peak at f0 to flatten the
frequency characteristics. A speaker with excellent acoustic characteristics can be obtained.
Furthermore, since it is not necessary to use a shape imparting material, it is easy to obtain
uniform quality at the manufacturing stage, and deterioration of the speaker edge due to the
temporal change of the shape imparting material does not occur.
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