| 摘要 |
PURPOSE:To accurately position a movable mirror for photometry, by energizing the movable mirror in the direction, in which the mirror is separated from a movable mirror for observation, in its photometrical position and pushing the movable mirror for photometry against a stopper. CONSTITUTION:A driving spring 28 which rotationally energizes a movable mirror 14 for photometry in the direction, in which the mirror 14 is separated from a movable mirror 11 for observation, when the mirror 14 is in its photometrical position and in the direction, in which the mirror 14 is pushed against the mirror 11 so that the mirror 14 can be put on the mirror 11, when the mirror 14 is in its non-photometrical position, is put between the mirrors 11 and 14 and a cam surface which guides the mirror 14 for photometry in the non-photometrical position direction when the mirror 11 for observation is retreated to the outside of a photographing optical path is provided. In addition, another cam surface which guides the mirror 14 in the photometrical position direction when the mirror 1 is returned to the optical path is also provided. The mirror 14 for photometry is guided and moved under a state where the movement of the mirror 14 is interlocked to the movement of the mirror 11 for observation and the energizing direction of the driving spring 28 is switched. Therefore, the detecting accuracy of a photoreceptor body for photometry can be improved with simple constitution.
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