Optical filter

Details Optical filter Optical filter

1988-12-09

1989-09-12

Arnold, Bruce Y.

350 11, 350164, G02B 110

Patent

active

048654051

ABSTRACT:
An optical filter used for a color image reader in order to adjust each amount of red, green and blue rays into constant ratio and to cutoff the rays of the near infrared radiation, the optical filter having a heat absorbing optical glass substrate and first and second interference films formed on the opposite sides of the substrates. The first interference film has three to eleven layers wherein a first layer immediately adjacent to the substrate has an optical thickness of .lambda./4 or .lambda./8 and a last layer farthest from the substrate has an optical thickness of .lambda./8, and said second interference film has thirteen to twenty-three layers wherein each of a first layer, second layer and third layer formed closest to the substrate in this order has an optical thickness greater than .lambda./4 and a last layer farthest from the substrate has an optical thickness of .lambda./8.

REFERENCES:
patent: 2403685 (1946-07-01), Sachtleben et al.
patent: 2742819 (1956-04-01), Koch et al.
patent: 4461532 (1984-07-01), Sato et al.
patent: 4659178 (1987-04-01), Kyogoku

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