| 摘要 |
PROBLEM TO BE SOLVED: To suppress the heat generation of the drive mechanisms of filters in the exposure mechanism of a photographic processing device. SOLUTION: Filter drive mechanisms 82A and 82B which drive the ND filters 81A and 81B to appear and disappear into and from the optical path between a light source unit 14 and a photosensitive material of the exposure mechanism 7 of the photographic processing device are provided. The filter drive mechanisms 82A and 82B are provided with bistable solenoids 821A and 821B containing permanent magnets and energizing means 83A and 83B for alternately supplying an electric current of a short time in a forward direction or backward direction to these bistable solenoids 821A and 821B, by which the ND filters 81a and 82B can be held to an advance state or retreat state even if the energization is not kept continued.
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