The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 1984
Filed:
Jun. 14, 1982
Applicant:
Inventors:
Shinichiro Kawamura, Yokohama, JP;
Takahiko Irimajiri, Yokohama, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G10K / ;
U.S. Cl.
CPC ...
181167 ; 181166 ; 181169 ; 181D / ; 1791 / ; 4283193 ;
Abstract
A speaker provided with a diaphragm having a foamed resin body of relatively low density on its front surface includes a thin sheet of foamed resin applied to its surface. The thin sheet of foamed resin has relatively high flexural rigidity and is impermeable to air, to enable the surface of the foamed resin body to be protected against damage or indentation that might otherwise be caused. The thin sheet of foamed resin may be coated with a paint or have a foil applied to its surface. The speaker has improved electroacoustic transducing efficiency.