Camera filter

Details Camera filter Camera filter

1985-03-14

1986-11-11

Arnold, Bruce Y.

350316, 350318, G02B 522, G02B 528

Patent

active

046218890

ABSTRACT:
A camera filter is provided with an ultraviolet ray absorbing substrate, on which is deposited an evaporated film which transmits blue and green light, but which sharply attenuates a portion of the red light in the higher wavelength range. Particularly, the wavelength at which the transmission factor reaches 50% is in a range from 640 to 700 nm. The evaporated film is formed on one surface of the substrate, typically the inner surface thereof relative to the camera lens, and the filter is fitted to a frame which may be suitably attached to the camera lens.

REFERENCES:
patent: 1971434 (1934-08-01), Trautmann
patent: 3551017 (1970-12-01), Iwasaki et al.
patent: 3758200 (1973-09-01), Saito
patent: 4311364 (1982-01-01), Motomura et al.

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