Optical filter structure

Details Optical filter structure Optical filter structure

1992-08-25

1993-09-28

Lerner, Martin

Optical: systems and elements

Having significant infrared or ultraviolet property

359361, 501 44, 501 45, 501905, C03C 3247, C03C 316, C03C 408, G02B 522

Patent

active

052490769

ABSTRACT:
Provided is an optical filter structure which has excellent solarization resistance, and stably gives a constant wavelength distribution and constant irradiation energy for a long time, and which efficiently cuts off infrared light including near infrared light and ultraviolet light having a short wavelength and is sufficiently permeable to visible light. The optical filter structure has a glass filter 7 formed of phosphate or fluorophosphate glass containing 0.1 to 5% by weight, as an oxide, of copper oxide and an aquafilter 6 having a liquid layer 5 measuring 3 to 50 mm as a light path length, the glass filter 7 being placed either outside a container wall, 2a or 2b, of the aquafilter 6 or within the liquid layer 5, and the optical filter structure has optical characteristics that the absorption edge on a short wavelength side is a region of light having a wavelength of 250 to 330 nm and that the maximum value of the spectral transmittance on a long wavelength side beyond 780 nm is not more than 40%.

REFERENCES:
patent: 4615989 (1986-10-01), Ritze
patent: 4771020 (1988-09-01), Onata et al.
patent: 4859637 (1989-08-01), Roberts
patent: 5173212 (1992-12-01), Speit et al.
JIS B 7751, "Light-Exposure and Light-and-Water-Exposure Apparatus", 1990.
JIS B 7753, "Light-and Water-Exposure Apparatus", 1988.
JIS B 7754, "Light-Exposure and Light-and-Water-Exposure Appratus", 1991.

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