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TECHNICAL FIELD The present invention relates to a speaker diaphragm used for audio
equipment. Although it is a necessary condition to make the snack plate as light snack as possible
in order to increase the efficiency of the speaker, the imaging plate for the conventional
technology needs to reduce the thickness of one side when the weight reduction is achieved with
a paper material. The surface strength decreases and the one-division resonance increases,
resulting in a distorted sound. In particular, in the case of an elliptical diaphragm, the strength in
the radial direction is particularly weak at the major diameter portion. Therefore, in order to
reinforce the conventionally lightened surface, conventionally, as shown in FIG. 6, a lip 5 is added
in the radial direction of the diaphragm 1, or in the circumferential direction as shown in FIG. A
method of adding is taken. However, when it is attempted to add the above-mentioned structure,
it is necessary to match the shape of the paper net and molding die to the shape thereof, and the
shape of the paper net and die is It becomes compound and processing cost becomes high. In
addition, it is clear that the installation of male and female is delicate and troublesome, and there
are many disadvantages in terms of maintenance. Therefore, the present invention provides a
speaker diaphragm that can solve such problems. Means for Solving the Problem In order to
solve this problem, the speaker diaphragm of the present invention is formed by the deposition
weighing different stepwise in the circumferential direction of the diaphragm and formed to have
a substantially uniform thickness over the entire surface. is there. In this way, surface strength
can be effectively reinforced at the stage of sheet forming, and as a diaphragm, split resonance
can be suppressed and clear sound with little distortion can be reproduced. EXAMPLE A
diaphragm of a speaker according to an example of the present invention will be described
below. As shown in FIG. 1, a density difference is added stepwise on the diaphragm surface in the
circumferential direction. That is, the high density part 2. Medium density part 3. A low density
part 4 is provided. Table 1 shows the density of each step. Table 1 Pulp: NUKP Degradability =
18 ░ SR Weight: 1.8F Dia. Plate diameter: 12E5X75 4 (long diameter О short diameter: ?
circle) Fig. 2 shows a diaphragm with the conventional constant surface density according to
Table 1, and The frequency characteristic of the speaker using the vibration by an Example is
shown. As is clear from the figure, the characteristics of the present example person are superior
to the conventional product B in terms of flatness. Incidentally, many peaks and valleys are
generated in the middle region in the frequency characteristics of the conventional product due
to the divided resonance of the diaphragm. FIG. 3 shows a part of the divided vibration mode of
the circular diaphragm as a reference example. The 'fA line portion and the white portion in the
same figure indicate that they are out of phase by approximately 180 degrees. Although a
vibration mode in a form similar to this occurs even with a circular-arc moving plate, divided
vibration is relatively likely to occur because the strength in the major axis direction is weaker
than in the minor axis direction.
For this reason, a large effect can be obtained by making the portion between the major and
minor axes the highest density, decreasing the density stepwise in the minor diameter direction,
and reinforcing the surface strength without increasing the overall weight. 4 and 6 are
explanatory views of a diaphragm showing another embodiment according to the present
invention. Effect of the Invention As described above, according to the present invention, the
diaphragm main body is machined so that the deposition weight changes stepwise in the
circumferential direction, and the entire surface is formed to have a substantially uniform
thickness. The surface strength can be reinforced at high density portions. As a result, the
diaphragm surface can be reinforced without using a mold having a complicated shape, and the
frequency characteristics can be greatly improved.
Brief description of the drawings
FIG. 1a is a plan view of a speaker diaphragm according to an embodiment of the present
invention, FIG. 1 is a perspective view of the same, and FIG. 2 is a frequency characteristic
diagram of a speaker using diaphragms of this embodiment and the prior art. Fig. 3aNf is a
distribution diagram of vibration modes generated in a circular diaphragm, Fig. 4a and Fig. 6a
are plan views of other embodiments, Fig. 4 and Fig. 5 are perspective views and Fig. FIGS. 6a
and 6b are plan views of the diaphragm body of the conventional example.
7A and 7B are a plan view and a perspective view of another conventional example. 1 и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и high density portion (H part). 3 иии Medium density part (M part), 4 и
и и и и Low density part (L part). Figure 1-(b) Figure 3 (Q) tb) in = 2.45 fo + f12. 2. 92 fo + fos * y,
thofat fta g 422 fat Figure 4 ? Figure 5 Figure 6 small] Figure 7 (a ) (B)
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