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JPH02312396

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DESCRIPTION JPH02312396
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
mid-high-tone speaker diaphragm having a dome-shaped diaphragm used in a high fidelity
speaker system or the like. In the prior art high fidelity speaker system, it is said that the
directivity of the speaker unit is wide and the sound quality is good. Therefore, dome-shaped
diaphragms are widely used for medium and high-pitched sound reproduction. Hereinafter, an
example of a conventional dome-shaped diaphragm will be described with reference to the
drawings. FIG. 2 shows a partial cross-sectional view of a conventional speaker unit having a
dome-shaped diaphragm. In FIG. 2, 1 is a dome type diaphragm. 2 is an edge, 3 is a voice coil
bobbin, and is fixed to the diaphragm 1 by an adhesive or the like. Reference numeral 4 denotes
a fixed end frame, 6 denotes a puff full, and 6, 7.8 denotes a field portion. The nubica configured
as described above is an electrodynamic speaker, and the operation thereof is well known and
thus the description thereof is omitted. Problems to be Solved by the Invention However, due to
the shape of the dome-shaped diaphragm shown in FIG. 2, when trying to raise the high
frequency limit frequency (fH), the vibrating surface is nitrided or a polon is deposited. In order
to increase the strength of the diaphragm, a diamond is coated by plasma CVD. All of these have
problems in that they require time for production and require expensive materials to process
them. SUMMARY OF THE INVENTION In view of the above problems, the present invention
provides a dome-shaped diaphragm which is easy to select materials and easy to manufacture.
Means for Solving the Problems The dome-shaped diaphragm of the present invention for solving
the above-mentioned problems is characterized in that the edge attaching part of the outer
peripheral part is in a shape of being folded in a cone shape. Operation The present invention
can improve the strength of the vibration itself by adopting the above-described shape, and if it is
possible to increase fH, the material is a material that can be formed integrally with the abovedescribed shape. Anything is fine. In addition, it is possible to make the later surface treatment
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and the like unnecessary. Of course, the surface treatment can further increase fH. EXAMPLE A
dome-shaped diaphragm according to an example of the present invention will be described with
reference to the drawings. FIG. 1 shows a partial cross-sectional view of a loudspeaker unit using
a dome-shaped diaphragm in an embodiment of the present invention. In FIG. 1, reference
numeral 1 denotes a dome-shaped diaphragm, and 1 a denotes an outer peripheral folded
portion integrally formed with the dome-shaped diaphragm 1. 2-8 are the same grooving as FIG.
FIG. 3 shows computer simulated frequency characteristics of the conventional dome-shaped
diaphragm and the dome-shaped diaphragm in one embodiment of the present invention. In FIG.
3, A is the frequency characteristic of the dome-shaped diaphragm according to the embodiment
of the present invention, and B is the frequency characteristic of the conventional dome-shaped
diaphragm. As described above, according to the present invention, fH can be easily increased by
providing a folded shape on the outer peripheral portion of the dome-shaped diaphragm. The
material may be anything as long as the folded portion can be integrally formed. Also, it is
possible to make the later surface treatment unnecessary. Of course, if surface treatment is
performed, fB (can be further raised. Effect of the Invention As described above, according to the
present invention, the upper limit frequency (fH) can be easily raised by folding the outer
peripheral portion which is the edge attaching portion of the dome-shaped diaphragm in a cone
shape.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a partial sectional view of a loudspeaker unit using a dome-shaped diaphragm according
to an embodiment of the present invention, FIG. 2 is a partial sectional view of a loudspeaker unit
using a conventional dome-shaped diaphragm, and FIG. It is a frequency characteristic figure
which compares the conventional dome-shaped diaphragm by simulation, and the dome-shaped
diaphragm in the Example of this invention.
1 ······ Dome shape diaphragm, 1a ······························································· Voice coil bobbin, 4 ··· · · · · · · · · ·
························································································
· · · · · · Yoke.
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