| 摘要 |
<p>PURPOSE:To perform always correct exposure on a film by retreating a photodetector to the outside of the optocal path of photographing luminous fluxes during film exposure. CONSTITUTION:One end of a photodetector holding member 12 holding a photodetector 4 in the intermediate part is pivotally fitted turnably by means of a pin 12a to a plate 11. The free end of the member 12 is held energized counterclockwise by means of a compression spring 13, and the turning limit thereof is regulated by the cam surface 14a of a cam member 14. The member 14 is rotatable, and the set position of the member 12, that is, the photodetector 4, is changed by the change in the contact position between the cam surface 14a and the free end of the member 12.</p> |
