| 摘要 |
PURPOSE:To obtain adequate photometric sensitivity distribution by arranging a photoconductive member opposite a film surface at the circumference of photographic light, and providing a photodetecting element on its emission surface. CONSTITUTION:A photoconductive member 10 is, for example, in a horseshoe shape and arranged opposite a film surface closely to a lens between a photographic lens and the film surface 12. Light reflected and diffused by the film surface and a shutter curtain surface strikes the incidence surface 10b of the member 10, passes through the reflective surface 10c in a Fresnel's grid shape, and is emitted from an emission surface 10e at the lower end of a base 10d to be measured by a photodetecting element 14. Since the photoconductive member 10 has large incidence area and faces the film surface and shutter curtain surface, the diffused light is received by the entire incidence surface 10e uniformly, so that photometric sensitivity distribution is uniform. |
