| 摘要 |
PURPOSE:To prevent a malfunction of an automatic focusing device, by providing an inclined face on the center part of a bottom cover of a square dent, and reflecting a luminous flux which is emitted from a light emitting cylinder of the automatic focusing device and passed through a slide film, in the direction different from a photodetecting cylinder, by its inclined face. CONSTITUTION:A slide film 39 is tightly held between a lug piece 34 and a supporting part 37, in accordance with elastic force of the lug piece 34, and a bottom wall 35 having an inclined face 38 effectively protects an emulsion fixed surface of the slide film 39, so that a direct view of the slide film 39 and its check can be executed easily. The inclined face 38 inclined by an angle A to the horizontal surface converts a part of a luminous flux A which passed through the film at a position where the slide film 39 crosses the optical axis of a projection lens 11, to a reflected ray C which is inclined by 2alpha angle to the outside with respect to a reflected ray B reflected by the film surface, therefore, it is not feared at all that its influence is exerted on a photodetector 20. |
