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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for various audio devices. 2. Related Art In recent years, speakers have
become extremely diversified depending on the field in which they are used. Thinness is one of
the major needs in automotive applications. In thinning the speaker, at the same time as thinning
the field section, thinning of the frame becomes an issue, but this depends on how the vibration
system can be made shallow. Hereinafter, the speaker diaphragm will be described with
reference to the drawings. FIG. 2 shows an example of a half cross section of a conventional
shallow cone type speaker diaphragm. Here, 1 is a cone surface, 2 is an edge, 3 is an arrow sheet,
and cone surface 1 is curved with a single-R. Although this single-R curve can provide relatively
safe characteristics, in the case of a shallow cone, the neck angle ψ becomes large and the high
region does not extend, and since the out-of-plane θ also becomes horizontal, concentrated
vibration is concentrated The sound pressure frequency characteristic is likely to be greatly
disturbed. In order to improve this characteristic, there is a method of setting a small R1 +
peripheral part near the neck to a large R2 as shown in FIG. In this case, since the neck angle is
small and the out-of-plane angle θ is also increased, the high frequency can be extended to
improve the sound pressure frequency characteristic. However, since it approaches a plane from
the center of the surface to the outer periphery, another mode of abnormal resonance is likely to
occur. This appears as a subharmonic when the input is increased, and causes so-called surface
noise. For this improvement, a corrugation 6 for reinforcement is provided on the cone surface 1
in FIG. Problems to be solved by the invention However, in the case of the corrugation 6 as
shown in FIG. 3, the effect is similar to that with the substantial R on the cone surface 1 because
the cone is expanded to one side so as to strengthen the reinforcing effect. The characteristics
return to the cone paper 1 of FIG. Also, even with such a corrugation 6, the reinforcing effect is
not sufficient and the improvement of the surface noise is not perfect. SUMMARY OF THE
INVENTION In view of the above-mentioned drawbacks, the present invention provides a speaker
diaphragm having a sufficient reinforcing effect against surface noise without affecting the R9
characteristic of a cone surface. Means for Solving the Problems In order to achieve this object,
the present invention is configured such that corrugation is formed at the bonding portion of the
edge to the cone surface, and the bonding cross section with the cone surface is a pipe-like
reinforcing ring. ing. Operation With this configuration, a pipe-like three-dimensional
reinforcement exists between the cone surface and the edge, and it becomes a strong
reinforcement ring by being adhesively fixed. Also, there is no change in the shape of the cone
surface, and the influence on the face can be neglected.
Embodiment An embodiment of the present invention will be described with reference to the
drawings. FIG. 1 shows a speaker diaphragm in an embodiment of the present invention. In FIG.
1, 6 is a cone surface in which a small R ++ outer periphery is formed by a large R2 near the
neck, 7 is a cloth edge roll, 8 is a reinforcing corrugation of the cloth edge bonding part, and 9 is
an arrow. In the configuration as shown in FIG. 1, basically, there is no change in the surface
curve and the shape, and only the change in the bonding area with the edge, so the influence on
the sound pressure frequency characteristics can be ignored. The reinforcing corrugation 8 in
FIG. 1 is a three-dimensional ring in the form of a pipe composed of a cone surface 6 and a
molded piece of cloth edge, and its reinforcing effect is extremely large. The inside of the
reinforcing ring may be hollow or filled with an adhesive. The material of the edge is not
particularly limited, but the cloth edge is preferable from the viewpoint of the reinforcing effect.
As described above, according to the present invention, the sound pressure frequency
characteristics are not changed by providing the speaker diaphragm having the reinforcing ring
with the edge formed with the corrugation in the bonding portion and the cone surface being in
contact with each other. In addition, abnormal resonance such as surface noise can be prevented.
In the experiment of the speaker made of shallow cone paper as shown in FIGS. 1 and 2 of 160,
the following effects are obtained. Furthermore, since the present invention uses the inner
diameter of the edge which has conventionally been discarded and the manufacturing process
remains unchanged from the conventional one, the cost is unchanged and the practical effect is
that of a dog.
Brief description of the drawings
FIG. 1 is a half sectional view of one embodiment of a speaker moving plate according to the
present invention, FIG. 2 is a half sectional view of a conventional speaker diaphragm, and FIG. 3
is a half of another conventional speaker diaphragm FIG.
6 ...... cone surface, 7 ...... Etsujiroru unit, 8 ...... reinforcing corrugations, 9 ...... arrows paper.
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