Light measuring devices for cameras with automatic exposure control

Claim 1

In a camera with automatic exposure control, including an objective lens, a camera body with film loaded at the focal plane of said objective lens, and a focal plane shutter having a leading shutter member and a trailing shutter member controlling the light reaching said film, a light measuring device for automatic exposure control, comprising: light reflecting optical means facing a predetermined area of said focal plane to reflect light passing through said objective lens and reflected at a surface of said leading shutter member and/or a surface of said film, said light reflecting optical means including a transparent block having a light incident surface facing said predetermined area of said focal plane to receive the light reflected by the surface of said leading shutter member and/or the surface of said film, a light reflecting surface for reflecting the light passing through said light incident surface, and a light exit surface from which the light reflected by said light reflecting surface emerges; and light responsive means facing said light exit surface of said transparent block to receive the light reflected by said light reflecting surface for generating an output for automatic exposure control, said light reflecting optical means and said light responsive means being disposed outside the light path from said objective lens to said focal plane.