| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a light receiving device for a film unit with a lens which is excellent in photometric accuracy in center-weighted measuring and where the size of a photodetector and the characteristic of a light receiving lens are set to an optimum condition. SOLUTION: The light receiving lens 26 condensing subject light on a light receiving surface 23a is a positive meniscus lens whose convex surface faces to a subject side. A lens whose focal distance is selected from the range of >=6 mm and <=9 mm and whose f-number showing the brightness of a lens is within the range of 1 to 1.5 is used as the lens 26. By using the photodetector 23 where the light receiving angle of the surface 23a is set to the range of 12 deg. to 18 deg. and which has the surface 23a having the diameter of 2 to 3 mm, the center-weighted measuring in the film unit with a lens thin in thickness is accurately performed, and the lens having absolute minimum size is used as the lens 26.</p> |
