专利名称：Light measuring arrangement for a single
lens reflex camera
发明人：Takehiko Kiyohara,Youichi Okuno,Tokuichi
Tunekawa,Teiji Hashimoto
申请号：US05/760960申请日：19770121公开号：US04134652A公开日：19790116
摘要：In a finder optic system having the structure in which a tiltable mirror, in itsreflecting position, reflects light entering through the camera objective upward onto afocusing screen where an image of the object to be photographed is formed and lightfrom the image is radiated upward through the condenser lens and a pentaprism into aneyepiece, a light meter arrangement in accordance with an embodiment of the inventioncomprises a single photo-cell and a glass plate provided with an angular surface formedtherein for acceptance of the photo-cell. The glass plate is cemented at one of thesurfaces parallel to the exit surface of the pentaprism in front of the eyepiece and isoriented so that the angular surface is rearwardly inclined with respect to the axis of thefinder optic, whereby a light beam from one of two different portions outside the centralportion of the image is directed through the pentaprism with regular reflections thereinto the angular surface to reach the photo- cell and a light beam from the other isdirected through the pentaprism without any regular reflection to the angular surface toreach the same photo-cell. The arrangement permits the photo-cell to produce a lightvalue which is, in effect, substantially equal to that sensed by a photo- cell positioned to
receive a light beam from the central portion of the image.
申请人：CANON KABUSHIKI KAISHA
代理机构：Toren, McGeady and Stanger
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