Optical source unit for an endoscope

Details Optical source unit for an endoscope Optical source unit for an endoscope

1979-03-30

1982-12-28

Lechert, Jr., Stephen J.

Illumination

Photographic lighting

Light responsive

362 5, 362 32, 362263, 362276, 362321, G03B 1502

Patent

active

043665292

ABSTRACT:
An illumination device for photographing a portion of the body cavity to be examined with an endoscope having a light source using a discharge tube circuit for illuminating the portion to be examined and a mechanical shutter arranged in the optical path of illuminating light from the light source. A light quantity detecting circuit detects information on the brightness of illumination of the light source and a correct exposure time setting circuit together a correct exposure time estimating circuit receive the output from the light quantity detecting circuit. The closure of the mechanical shutter is controlled by the control operations of the correct exposure time setting circuit and correct exposure time estimating circuit. The discharge tube circuit comprises a time constant circuit, a relay circuit and a high voltage circuit. The high voltage circuit is controlled by the relay circuit to intermittently apply a voltage to start discharge until ignition takes place.

REFERENCES:
patent: 4053756 (1977-10-01), Takahashi
patent: 4110820 (1978-08-01), Konoshima

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