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. 18, 2011
Filed:
Nov. 23, 2010
Nobuhiko Takeshita, Koriyama, JP;
Teppei Konishi, Koriyama, JP;
Hiroshi Kumai, Koriyama, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
A compound having a good durability against light and capable of producing desired liquid crystallinity after polymerization, and a polymerizable liquid crystal composition containing such a compound, 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. A compound represented by CH═CR—COO—R-Cy-Ph-R—OCO—CR═CH. Rand Rare each preferably a hydrogen atom. Ris preferably a Calkylene group wherein an oxygen atom is present or not present at an end of the group to be bonded to a cyclic group, and wherein some or all of hydrogen atoms bonded to carbon atoms in the group may be substituted by fluorine atoms; or an alkylene group wherein an oxygen atom is present at an end of the group to be bonded to a cyclic group. A diffraction gratingproduced by employing this liquid crystal compound has a good durability against light, and accordingly, it is possible to constitute an optical information writing/reading device suitable for large capacity recording by employing a blue laser as a light source