Polarizer

Details Polarizer Polarizer

2005-11-01

2005-11-01

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

C359S485050, C349S119000

Reexamination Certificate

active

06961180

ABSTRACT:
There is provided a polarizer constituted by: a polarizing element; and at least one transparent protective film constituted by two layers of retardation films with an in-plane retardation in a range of from 190 to 320 nm with respect to light having a wavelength of 550 nm, the transparent protective film being bonded onto one of opposite surfaces of the polarizing element so that a slow axis of each of the retardation films is parallel with an absorption axis of the polarizing element, the two layers of retardation films being constituted by a combination of a retardation film with Nz of from 0.65 to 0.85 and a retardation film with Nz of from 0.15 to 0.35 on the condition of nx>ny and Nz=(nx−nz)/(nx−ny) in which nx and ny are in-plane refractive indices of each of the retardation films respectively, and nz is a refractive index in a direction of thickness of each of the retardation films.

REFERENCES:
patent: 2441049 (1948-05-01), West
patent: 5087985 (1992-02-01), Kitaura et al.
patent: 5227903 (1993-07-01), Miyazawa et al.
patent: 5594568 (1997-01-01), Abileah et al.
patent: 0 350 075 (1990-01-01), None
patent: 4-305602 (1992-10-01), None
patent: 4-371903 (1992-12-01), None
patent: 3165168 (2001-03-01), None
patent: 3165178 (2001-03-01), None
Patent Abstract of Japan 04-305602, Oct. 28, 1992.
Patent Abstract of Japan 04-371903, Dec. 24, 1992.

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