PHOTOGRAPHING LIGHT QUANTITY CONTROLLER FOR ENDOSCOPE

摘要

A photographing light quantity controller for an endoscope, which is used to control the quantity of illuminating light when a photograph is to be taken through the endoscope. The photographing light quantity controller comprises a device for supplying light for illuminating an object to be viewed by the endoscope, a photoelectric conversion device for converting into an electric signal, a brightness level of exposure light that is applied to a photographic plane in a photographing device after being reflected from the object, and a device for integrating the output from the photoelectric conversion device and outputting the resulting integral value. The photographing light quantity controller further comprises a device for outputting a numerical value corresponding to a quantity of exposure light which is to be applied to the photographic plane, a device for converting the integral value into a numerical value on the same scale as that of the numerical value of the exposure quantity, and a device for deciding an exposure quantity, and a device for deciding an exposure time by comparing the numerical value of the exposure quantity and the output value from the integral value converting device.