Photographing apparatus for an endoscope

Details Photographing apparatus for an endoscope Photographing apparatus for an endoscope

1981-03-11

1982-09-14

Adams, Russell E.

354 33, 354 62, G03B 708

Patent

active

043492550

ABSTRACT:
A photographing apparatus for an endoscope comprises a first photodetector for detecting part of the light projected from an image guide of an endoscope and a second photodetector for detecting part of the flash light guided in a light guide of the endoscope. A resistor is connected in parallel with the first photodetector. A voltage induced across the two ends of the resistor is amplified and is supplied to an integrating circuit until the voltage is saturated. When the voltage induced across the two ends of the resistor is saturated, a voltage induced in the second photodetector is supplied to the integrating circuit after amplification and level adjustment. When the output from the integrating circuit reaches a predetermined level, supply of the flashlight to the light guide is interrupted.

REFERENCES:
patent: 3440938 (1969-04-01), Stimson et al.
patent: 3591829 (1971-07-01), Murata et al.
patent: 3599630 (1971-08-01), Sato et al.
patent: 3670722 (1972-06-01), Kosaka
patent: 3683766 (1972-08-01), Nobusawa
patent: 3836924 (1974-09-01), Kawasaki
patent: 3906516 (1975-09-01), Harvey
patent: 4153356 (1979-05-01), Hama

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