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. 24, 2007
Filed:
May. 12, 2003
Akiko Shimizu, Niihama, JP;
Akiko Shimizu, Niihama, JP;
Sumitomo Chemical Company, Limited, Tokyo, JP;
Abstract
The objective of the present invention is to provide a laminated phase retarder film that is superior in evenness, exhibits a biaxial optical property as a whole, and makes it possible to set the biaxial optical property over a wide range. This object is achieved by a laminated phase retarder film comprising a transparent resin film as a substrate and at least one coat layer having a refractive-index anisotropy laminated on at least one surface of the substrate, wherein a in-plane retardation value (R) is not less than 20 nm, a retardation value (R') in the film-thickness direction, which is calculated from a retardation value (R) measured by inclining by 40 degrees around the slow axis of the film and the in-plane retardation value (R), is greater than 40 nm.