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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are perspective views of the dust cap of
the speaker according to the present invention, and FIG. 3 shows the case without the dust cap
(curve 6) and the case with the conventional dust cap (curve 6). Fig. 7 shows curve 7) and the
frequency characteristic curve with the inventive dust cap (curve 8). Fig.1 Fig.2 Fig.4 1 1 1 1 85
150 50-54135 (2) Fig. 3-1; Engraved 1 j 駁 Cl 4 z> 1%-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
sound cap. Conventionally, the dust cap in the magnetic circuit of the speaker and the dust cap in
which the speaker diaphragm is reinforced is made of the material of each ridge. Generally, the
rigidity of the material is increased to suppress the divided vibration of the diaphragm, and the
peak and valley of one frequency characteristic is flat? For 1IIK-f, after dispersing separately or
mixed materials of high festival fiber or synthetic fine noodles in water and forming into a
desired shape, it is damaged by hot pressure forming. In the conventional method as described
above, it is possible to increase the rigidity, or the internal loss is insufficient, and an abnormal
sound is generated due to the deterioration of the frequency characteristic due to the abnormal
resonance of the cap In the present invention, the present invention provides the canister with
appropriate rigidity and internal loss, and abnormal vibration of the diaphragm and cap! It
relates to the dust cap of the speaker for the purpose of suppressing l and improving the
frequency characteristic. A wood-tipped cap is a hot-pressed paper or fiber material formed into
a fiberboard shape by blending a large amount of thermoplastic synthetic resin with a fiber
material such as wood pulp during a paper making process as shown in a / f, f- diagrams.
Material made of heat-pressed paper coated with or impregnated with heat ρ plasticity synthetic
resin, and woven or non-woven fabric made of natural fiber or synthetic fiber, and relatively soft
material with large internal loss It is what is pasted together with /. One method of bonding the
above-mentioned material / λ is by impregnating or spreading heat iIJ plastic synthetic resin or
the like on the flat surface and superposing the material J on the flat surface with high rigidity by
heat pressure forming. Both are laminated to obtain the dust cap shown in the cap-like figure. As
another method of bonding the above-mentioned material 7.2, it is possible to place the string
material gi / on the plane on the front surface through the thermoplastic resin solid adhesive 3
between the material / material 2 The dust cap, which is constructed in the form of a soil, is
attached to the end of the mold to obtain a dust cap S shown in a cap-like octopus figure. Since it
is formed into one layer or three layers via an adhesive, it can be improved as shown in the
frequency characteristic curve of FIG. That is, in FIG. 3, in the speaker using the same diaphragm
(cone sheet), the curve 6 is a dust cap according to the present invention, and the curve 7 is a
dust cab according to the present invention when the conventional cap is attached. It is a chest
wave number characteristic music stem at the time of putting.
As can be seen from the above-mentioned curve t, the sound pressure level can be tampered
relatively relatively within the frequency range of about J00 H2 to jαυBZ.
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