Polarizing filter and producing method thereof

Details Polarizing filter and producing method thereof Polarizing filter and producing method thereof

2006-12-12

2006-12-12

Dunn, Drew A. (Department: 2872)

Optical: systems and elements

Light interference

Produced by coating or lamina

C359S580000, C359S490020

Reexamination Certificate

active

07149031

ABSTRACT:
In order to produce a polarizing filter, first and second protective films are adhered to respective surfaces of a polarized film. When M1, M2are determined as respective coefficients of expansion by water absorption of the first and second protective films, the coefficients of expansion satisfy a formula, 0.65·M1<M2<1.55·M1. A difference of the thickness between the first and second protective films is more than 2 μm and less than 100 μm. Further, the first and second protective films are formed of cellulose triacetate, and the polarized film is formed of polyvinylalcohol series. Thus the polarizing filter has no curl to be formed after the protective films are adhered to the polarized film.

REFERENCES:
patent: 4620772 (1986-11-01), Sugimoto et al.
patent: 6731357 (2004-05-01), Tachibana et al.
patent: 2002071955 (2002-03-01), None

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