Optical: systems and elements – Absorption filter
Patent
1999-10-20
2000-12-05
Chang, Audrey
Optical: systems and elements
Absorption filter
252582, 252586, 313112, 313478, G02B 522, G02B 502, G02B 523, H01J 516, H01J 3100
Patent
active
061575046
ABSTRACT:
An optical filter comprises a transparent support and a filter layer. The filter layer has an absorption maximum in the wavelength range of 500 to 550 nm. The filter layer further has another absorption maximum in the wavelength range of 560 to 620 nm. The optical filter has a transmittance in the range of 40 to 85% at the absorption maximum in the wavelength range of 500 to 550 nm. The optical filter further has a transmittance in the range of 0.01 to 80% at the absorption maximum in the wavelength range of 560 to 620 nm.
REFERENCES:
patent: 5271872 (1993-12-01), Sallavanti et al.
patent: 5426018 (1995-06-01), Hibino et al.
patent: 5569766 (1996-10-01), Waggoner et al.
Harada Toru
Ikuhara Isao
Nakamura Taku
Yabuki Yoshiharu
Yamada Tsukasa
Chang Audrey
Fuji Photo Film Co. , Ltd.
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