Toren, McGeady and Stanger
Light measuring device for camera
 At least one electro-optical light shielding member is disposed close to a reticle of a photographic camera arranged for forming an image of an object to be photographed. The light shielding member is electrically controlled to have the reticle partly light-shielded by the light shielding pattern of the light shielding member in such a manner as to permit selection between an averaging light measuring mode and a spot light measuring mode. 
Canon Kabushiki Kaisha
G G G
G03B G03B G03B
inventional inventional inventional
Makoto Akira Kazuhiko Hiroyasu
Katsuma Hiramatsu Arakawa Murakami