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:
Jun. 28, 2011
Filed:
Mar. 29, 2005
Morimasa Wada, Osaka, JP;
Tadayuki Kameyama, Osaka, JP;
Hiroaki Mizushima, Osaka, JP;
Naoki Tomoguchi, Osaka, JP;
Morimasa Wada, Osaka, JP;
Tadayuki Kameyama, Osaka, JP;
Hiroaki Mizushima, Osaka, JP;
Naoki Tomoguchi, Osaka, JP;
Nitto Denko Corporation, Ibaraki-Shi, Osaka, JP;
Abstract
The present invention provides a method for manufacturing a polarizing film, by which, even when a wide raw film is used, it is possible to obtain a polarizing film that achieves excellent optical characteristics as well as uniformity in in-plane optical characteristics. The method includes the steps of dyeing a polymer film; stretching the dyed film; and drying the film that has undergone the dyeing and stretching steps while conveying the film with rolls. In the drying step, at least two rolls are used as the rolls and the film is dried under a condition that a ratio (R/W) of a distance (R) between the adjacent rolls to an initial width (W) of the polymer film is not less than 0.5 and not more than 4.0.