Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1987-03-20
1989-01-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250227, 350336, G01J 132
Patent
active
048017922
ABSTRACT:
An endoscope provided with a stop comprising an annular electrochromic element arranged in an objective lens unit so that the transmittance of the stop is varied in accordance with the amount of light from an object to be observed which has been measured, in order to prevent brightness in a field of view from being rapidly changed when the distance from the distal end portion of the endoscope to the object to be observed is varied.
REFERENCES:
patent: 4313663 (1982-02-01), Stemme et al.
patent: 4333720 (1982-06-01), Suzuki et al.
patent: 4340811 (1982-07-01), Yamashita et al.
patent: 4678900 (1987-07-01), Nishioka
patent: 4704520 (1987-11-01), Kanno et al.
Hattori Shin-ichiro
Kanamori Iwao
Yamasita Nobuo
Nelms David C.
Olympus Optical Co,. Ltd.
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