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. 16, 1988
Filed:
Mar. 12, 1985
Yoshihiro Matsuo, Neyagawa, JP;
Shoichi Ishihara, Katano, JP;
Kazuhisa Morimoto, Settsu, JP;
Seiichi Nagata, Sakai, JP;
Tetsu Ogawa, Otokuni, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
This invention provides an optical filter comprises of a pair of solid polymer films, wherein (1) a first solid polymer film has a planar alignment of a cholesteric liquid crystal structure of either clockwise or counterclockwise helical structure, which alignment allows the light of a specified wavelength to be scattered selectively, and (2) a second solid polymer film has a planar alignment of a cholesteric liquid crystal structure of a helical structure whose helical direction is the opposite to that of the first solid polymer film, which alignment allows the light at the specified wavelength to be scattered selectively, wherein the optical axes of the first and second solid polymer films are made substantially parallel to each other. This invention also provides preparation methods of an optical filter mentioned above.