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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
conical diaphragm used for an electrodynamic speaker. (Prior art and its problems) Generally, as
the dynamical properties that the diaphragm should have, it is lightweight to enhance efficiency,
has good transient characteristics, and has a large Young's modulus to widen the zone, and In
order to suppress the divided vibration and flatten the frequency characteristic, it is required that
the internal loss is appropriately large. In addition, the characteristics have been improved by
devising the shape of the moving plate. However, in the conventional conical diaphragm-like
electrodynamic loudspeaker diaphragm, since it has an axially symmetric shape, axisymmetric
resonance occurs, and there is a drawback that a peak occurs in the sound pressure versus
frequency characteristics. Furthermore, there is also a disadvantage that the shape is so simple
that it is deformed or weak in strength. (Means for Solving the Problems) The present invention
has been proposed in view of the above-mentioned problems, and the place to be aimed is to
suppress the division vibration by making the diaphragm shape asymmetric, and the vJ is strong
in strength. It is an object of the present invention to provide a diaphragm for an "R" type
speaker. In order to achieve the above object, the present invention is characterized in that, in a
conical diaphragm for an electrodynamic loudspeaker, the diaphragm is divided into fan-shaped
divided pieces, and the shapes of the divided divided pieces are changed. The speaker diaphragm
is the subject matter of the present invention. Hereinafter, the present invention will be described
in detail with reference to the drawings. It is needless to say that the embodiment is one example,
and various changes or improvements can be made without departing from the spirit of the
present invention. 1 (l) and (hl show one embodiment of the present invention, where FIG. 1 (a) is
a plan view and FIG. 1 (b) is a cross section taken along the line A-A of FIG. FIG. In the figure (a),
1 is a diaphragm, 2 and 3 are the divided pieces, the divided piece 2 is a straight cone, and the
divided piece 3 is a curved cone. This embodiment is an example of six divisions. The broken
lines indicated by H @ +, 82 and H3 indicate the contours of the divided pieces as seen in the
plan view. A figure (b) is an AA cross section, and a level | step difference is formed in the
junction part of the division pieces 3 and 2, and the rib as a reinforcement member is formed. 2
(a) and 2 (b) are diagrams which do not show another embodiment of the present invention,
wherein FIG. 2 (A) is a plan view and FIG. 2 (b) is a sectional view taken along the line B-B of FIG.
is there. Reference numeral 4 is a diaphragm, and 5.6 and 7 are divisions of the imaging plate 4.
The division 5 is a curved cone, the division 6 is an inverted curved cone, and the division 7 is a
straight cone and divided into five parts. There is. H @ +, H @ 2 and H @ 3 show contour lines as
in FIG.
Further, as shown in FIG. 7B, the joint between the divided pieces 5 and 6 forms a rib-like step.
The split pieces of the embodiment of FIGS. 1 and 2 can be easily manufactured if they are split
into answer valves. (Effect of the invention 91. As described above, according to the present
invention, in the diaphragm for a dynamic electrodynamic speaker according to the present
invention,! By dividing the Ji moving plate into intended pieces and changing the shape of each
divided piece, it is possible to suppress the split shooting movement of the shooting plate and to
form the rib formed on the joint of the divided pieces The moving plate is reinforced by the steplike step.
Brief description of the drawings
1 (a) and 1 (h) show an embodiment of the present invention, wherein FIG. 1 (a) is a plan view,
FIG. 1 (h) is a sectional view taken along the line A-A of FIG. a) and (h) are figures which show the
other Example of this invention, a figure (a) is a top view, and a figure (b) is BB sectional drawing
of a figure ta.
1.4 · · · Moving plate, 2.3.
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