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:
Oct. 02, 2012
Filed:
Sep. 21, 2007
Masato Saito, Saitama, JP;
Masuo Koyama, Saitama, JP;
Masato Saito, Saitama, JP;
Masuo Koyama, Saitama, JP;
Kimoto Co., Ltd., , JP;
Abstract
The present invention provides a film for optical use wherein interference patterns are inconspicuous, while hard coat properties and image sharpness are maintained. In the film for optical use, an undercoat layeris disposed between a base material layerand a resin layerhaving hard coat properties. Refractive index na of the base material layer, refractive index nb of the undercoat layerand refractive index nc of the resin layersatisfy the relationship of na≦nb≦nc or na≧nb≧nc (provided that na≠nc). The difference between the refractive index na of the base material layerand the refractive index nb of the resin layeris 0.5 or smaller. Since the difference of refractive indexes of adjacent layers is low, interference unevenness can be suppressed and image sharpness can be maintained.