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, 2012
Filed:
Dec. 28, 2010
Satoshi Okada, Koriyama, JP;
Hiroshi Kumai, Koriyama, JP;
Makota Hasegawa, Tokyo, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
An optically anisotropic material having a good durability against light is provided. Further, an optical element having a good durability against light and an optical information writing/reading device employing such an element are provided. The optically anisotropic material is obtainable by polymerizing a polymerizable liquid crystal composition containing at least 5 mol % of at least one type of polymerizable compound represented by a general formula CH═CR—COO—K-Cy-Cy-L-OCO—CR═CH. A phase difference plateproduced by employing the optically anisotropic material has a good durability against light, and accordingly, the phase difference platecan realize an optical heat device suitable for large capacity writing/reading by employing a blue laser as a light source