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. 14, 2015
Filed:
Jul. 28, 2010
Taku Hatano, Tokyo, JP;
Kenichi Harai, Tokyo, JP;
Taku Hatano, Tokyo, JP;
Kenichi Harai, Tokyo, JP;
ZEON CORPORATION, Tokyo, JP;
Abstract
A phase difference plate is manufactured by a method including a step of forming a multilayer body by co-extruding or co-casting a resin A having a positive intrinsic birefringence value and a resin B having a negative intrinsic birefringence value, the multilayer body including a layer 'a' containing the resin A and a layer 'b' containing the resin B; a step of stretching the multilayer body at a temperature Tin one direction; and a step of subsequently stretching the multilayer body at temperature Tlower than the temperature Tin a direction that is approximately orthogonal to the previous stretching direction. The resulting phase difference plate has specific in-plane retardation Rea of the layer “a”, retardation Rta in the thickness direction thereof, in-plane retardation Reb of the layer “b”, and retardation Rtb in the thickness direction thereof.