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:
May. 30, 2006
Filed:
Dec. 17, 2003
Yuuichi Nishikouji, Ibaraki, JP;
Nao Murakami, Ibaraki, JP;
Tokio Fujita, Ibaraki, JP;
Hiroyuki Yoshimi, Ibaraki, JP;
Yuuichi Nishikouji, Ibaraki, JP;
Nao Murakami, Ibaraki, JP;
Tokio Fujita, Ibaraki, JP;
Hiroyuki Yoshimi, Ibaraki, JP;
Nitto Denko Corporation, Ibaraki, JP;
Abstract
The present invention provides a birefringent optical film having a high orientation for easily obtaining a desired retardation value and also a small photoelastic coefficient. The birefringent optical film includes at least two kinds of polymer materials. A total of products of Cn and Wn satisfies a numerical formula (1):Σ()≦20×10cm  (1)where Cn and Wn denote respectively a photoelastic coefficient and a volume fraction of each polymer material, and at least one of the polymer materials of the film has a photoelastic coefficient value of at least 60×10cm/N, while at least one of the remaining polymer materials has a negative value of photoelastic coefficient.