TEMPERATURE CONTROL METHOD FOR FLUORESCENT LIGHT IN PICTURE READER

摘要

PURPOSE:To read the density of an original accurately just after lighting of a fluorescent light by keeping a temperature of the fluorescent light to be a prescribed temperature or over even at distinguishment of the fluorescent light. CONSTITUTION:A light from a fluorescent light radiates an original and a reflected light from the original is subject to photoelectric conversion section by an image sensor having a sensitivity even at an infrared ray region. The production of an infrared ray just after the lighting is prevented by keeping a tube wall temperature of the fluorescent light to be 50-60 deg.C for non-lighting period of the fluorescent light.