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:
Feb. 17, 1998
Filed:
Oct. 24, 1995
Applicant:
Inventors:
Toshiaki Takano, Osaka, JP;
Jun Murata, Osaka, JP;
Shoji Nakamura, Osaka, JP;
Masaaki Sunohara, Hyogo, JP;
Takahisa Kondou, Hyogo, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
264-24 ; 264-27 ; 264 405 ; 425149 ; 425407 ; 425408 ; 425808 ;
Abstract
Optical material, which was already roughly molded, is deposited into a space defined by a top mold, a bottom mold and a drum mold, and is then heated, pressed and molded, thus providing an optical element. By controlling the rate of plastic deformation of the optical material so as to prevent the material from entering clearance sections between the outside diameter of the top mold or of the bottom mold and the inside diameter of the drum mold, an optical element of high precision with no burr nor strain is provided at low cost.