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:
Aug. 19, 2008
Filed:
Mar. 25, 2004
Yasumasa Yoshitomi, Yokohama, JP;
Tetsuya Toyoshima, Yokohama, JP;
Masanori Yoshihara, Kawasaki, JP;
Yasumasa Yoshitomi, Yokohama, JP;
Tetsuya Toyoshima, Yokohama, JP;
Masanori Yoshihara, Kawasaki, JP;
Zeon Corporation, Tokyo, JP;
Abstract
A protective film for polarizing plates comprises an antireflection layer (reflectance≦0.5% at 550 nm) having high refractivity layers and low refractivity layers alternately laminated on a thermoplastic film (photoelastic coefficient≦9.0×10Pa, saturated water absorption<0.05% by weight) and has 0.3 or smaller standard deviation of S, which is obtained by obtaining a reflectance R(λ) at a wavelength λ while λ is increased from 380 to 780 nm by an increment Δλ of 1 nm, calculating S: and calculating the standard deviation at 10 points randomly selected within 100 cmon the surface of the film. When the film is disposed on the surface of the visual side of a display device such as a liquid crystal display device, the film prevents reflection and suppresses fluctuation in distributions of luminance and color difference due to the uniform spectral reflectance within the surface of the film.