| 摘要 |
PURPOSE:To contrive to reduce the preheat time of a fluorescent light by comparing the output of a temperature detection element and outputs of the 1st and 2nd reference voltage sources respectively so as to control the lighting of a light source, thereby applying accurate color separation. CONSTITUTION:A self control heat element 5 is used for preheating normally and a tube wall temperature of light source is detected by a temperature detection element 6 just before the reading and when the tube wall temperature of the light source is lower than a prescribed temperature range, the light source is lighted. Then the preheating by the self control heat element 5 and the fluorescent light itself is applied and after it is discriminated that the temperature reaches within a prescribed temperature range by the temperature detection element 6 to start the read. When the tube wall temperature of the light source is higher than the prescribed temperature range, it is awaited that the temperature reaches a prescribed temperature range, and the light source is lighted after the temperature detection element 6 detects the arrival of prescribed temperature range, and the light source is lighted to start reading. The preheat time of the fluorescent light is reduced and the fluorescent light is used at a temperature range with excellent light efficiency to attain accurate color separation.
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