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:
Jul. 21, 2009
Filed:
May. 27, 2005
Yoshiharu Ooi, Chiyoda-ku, JP;
Ryota Murakami, Koriyama, JP;
Hiromasa Sato, Koriyama, JP;
Takuji Nomura, Koriyama, JP;
Masahiro Murakawa, Koriyama, JP;
Yoshiyuki Miyake, Chiyoda-ku, JP;
Yoshiharu Ooi, Chiyoda-ku, JP;
Ryota Murakami, Koriyama, JP;
Hiromasa Sato, Koriyama, JP;
Takuji Nomura, Koriyama, JP;
Masahiro Murakawa, Koriyama, JP;
Yoshiyuki Miyake, Chiyoda-ku, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
A phase plate having a reduced size and a reduced weight and having accurately parted regions while it has the same function as a conventional two-parted optical rotation plate and an optical data recording/reproducing device capable of stably recording and reproducing are presented. A phase plate Pcomprising a polymer liquid crystal filmheld between transparent substrates i,, wherein the polymer liquid crystal filmis parted spatially in the region into which an incident light enters, so that the light transmitting the phase plate assumes a different state of polarization depending on an aligning direction of the molecules of the polymer liquid crystal film. The phase plate is located as a two-parted optical rotation plate in an optical data recording/reproducing device.