Camera with electrochromic filter

Details Camera with electrochromic filter Camera with electrochromic filter

1995-02-28

1996-09-10

Perkey, W. B.

G03B 708

Patent

active

055550690

ABSTRACT:
A camera includes means for supporting an imaging element for recording a scene, an electrochromic filter disposed between the scene and the imaging element and a photoelectric element which emits electrical energy the value of which depends on an amount of scene light which is incident on the photoelectric element. At least a portion of the electrical energy emitted by the photoelectric element is used to directly control the optical density of the electrochromic filter, thereby controlling the amount of scene light which reaches the imaging element.

REFERENCES:
patent: 3476029 (1969-11-01), Schreckendgust
patent: 4054890 (1977-10-01), Shimomura
patent: 4218120 (1980-08-01), Kawamura et al.
patent: 4372657 (1983-02-01), Iwata et al.
patent: 4475803 (1984-10-01), Katsuma et al.
patent: 4480269 (1984-10-01), Yoshida et al.
patent: 4526454 (1985-07-01), Suzuki et al.
patent: 4554587 (1985-11-01), Ooi et al.
patent: 4591253 (1986-05-01), Hecker et al.
patent: 4804992 (1989-02-01), Moriyama et al.
IEEE Circuits and Devices, Mar. 1992, pp. 21 and 22.

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