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JPS5093136

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DESCRIPTION JPS5093136
Name of Patent Application Invention inventor / patent applicant Address Marunouchi, Chiyodaku, Tokyo-Chome No. 5 No. 1 Hitachi, Ltd. [Phase] Japan Patent Office ■ Japanese Patent
Application No. (1975) 7.25, agency internal serial number 乙 gs, ss Name of the invention
laminated diaphragm for a speaker name of the invention laminated diaphragm for a speaker
Speaker laminated diaphragm
DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the
improvement of a laminated diaphragm for a speaker having a structure in which a polymeric
material is sandwiched in a metal cone. The conventional laminated diaphragm for sandwiching a
polymer material in metal and a laminated diaphragm for a speaker is intended to improve the
rigidity, and therefore has a large rigidity but a small loss at 1 °. That is, in the conventional
structure, the rigidity of the diaphragm is increased and the hard foam material is added to the
sandwich material: plastic, such as polystyrene resin, polychloride. Foams such as Neil,
polymethacryl-amide resin, polyepoxy resin and phenolic resin are used. All these foamed
plastics have a small internal loss, so they have no damping effect on the metal cone, and the
internal loss of the diaphragm is extremely small. It is a necessary condition to improve the
sound pressure frequency characteristics of the speaker by suppressing the split resonance of
the plate, but The internal loss of the diaphragm can not be increased because the material
configuration is as described above in the conventional Ω method. The object of the present
invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a
laminated diaphragm for a speaker having an improved internal loss. It is in. The feature of the
present invention is the large internal loss in the sand-inch material of the laminated diaphragm
having a sandwich-like structure 1 in cross section. By using the Kim porous material, the metal
cone is externally damped to improve the internal loss as a diaphragm.
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Speaker laminated diaphragm
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG.
1.4, EndPage: FIG. 1 is a cross-sectional view of the laminated diaphragm of the present invention
having a sandwich-like structure. In the figure, 1 is a metal cone obtained by forming an
aluminum-nium alloy plate having a thickness of 1 mm, 2 is a steel / doisochi material, and has a
large internal loss of 2 mx in thickness (tan δ 202) soft foam polyethylene . 6 is an epoxy resinbased adhesive for bonding a metal cone and a sand inch material. In the above material
configuration, the metal cone directly vibrates air which is a medium of sound as a diaphragm
substrate, and the sanding inch material absorbs and damps the divided vibration energy of the
metal cone and maintains the necessary rigidity as a diaphragm. It is no good. Therefore, in
addition to the large internal loss of the sandwich material id, the rigidity of the diaphragm is
improved as it is thicker, and therefore it is necessary to reduce the weight increase by
thickening as much as possible, and it is necessary to reduce the specific gravity. It is 有]-1-. For
this reason, soft foam plastic was used as the sandwich in the above example, but fibrous
aggregates, such as h, l or non-woven fabrics (in which fine hollow spheres are mixed with
viscous material or impregnated with viscous material (The invention is suitable as a sand inch
material of the method of the present invention. On the other hand, a conventional diaphragm
Suntoy used for comparing the structure of the present invention with the conventional
structure. The tack material is hard foamed vinyl chloride and its internal loss .quadrature. Is
0.03 (the metal cone and the adhesive are the same as the embodiment of the structure of the
present invention shown in FIG. Therefore, the function of the sand-inch material in the
conventional diaphragm is different from that of the structure of the present invention, and it is
merely for maintaining the rigidity of the vibration plate 1. The method of the present invention
is also applied to rigid materials other than metal cones in the above embodiments, for example,
molded cones such as epoxy resin, polyester resin, phenol resin and reinforced plastic material.
きる。 The internal loss measured for each of the diaphragms described in the examples above
was 0.14 for the diaphragm according to the structure of the present invention, whereas it was
002 for the diaphragm according to the conventional method. 0 This is because the metal cone is
subjected to the damping action by using a material having a large internal loss for the sand rtutch material, and the internal loss as the diaphragm is thus greatly improved. FIG. 2 is a
diagram showing sound pressure frequency characteristics of a loudspeaker using the laminated
diaphragm according to the present invention and the conventional laminated diaphragm.
As shown in FIG. 2, the sound pressure frequency characteristics of the speaker using these
diaphragms are characteristic of the diaphragm according to the structure of the present
invention in comparison with the characteristic curve 鴨 of the diaphragm according to the
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conventional structure. The diaphragm with the structure of the present invention is clear from
the fact that @y is more effectively suppressed 9 and the characteristics in the low frequency
region with a large amplitude are almost the same between the two. 2 is a sound pressure
frequency characteristic of a speaker using the laminated diaphragm according to the present
invention and the conventional laminated diaphragm. 1; metal cone, 2; sand wood, 6; adhesive,-:
conventional diaphragm Ω characteristic curve, j: characteristic curve of diaphragm according to
the present invention 'EndPage: 2 gum / face 2 figure wA JP-A 50-93136 (3) List of attached
documents (1) One specification (2) one drawing (3) one letter of attorney → →-→ −-→
reciprocation : 3
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