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:
Jan. 10, 2012
Filed:
Dec. 02, 2010
Satoshi Okada, Koriyama, JP;
Makoto Hasegawa, Koriyama, JP;
Hiroshi Kumai, Koriyama, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
A liquid crystal compound having a good durability against light, a polymerizable liquid crystal composition and an optically anisotropic material are 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 liquid crystal compound is represented by a general formula CH═CR—COO-(L)-E-E-(E)-R. Eis preferably a trans-2,6-decahydronaphthalene group and Eis preferably a trans-1,4-cyclohexylene group. A phase difference plateproduced by employing the compound has a good durability against light, and accordingly, it is possible to achieve an optical head device employing a blue laser as a light sourceand being suitable for large capacity writing/reading.