Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1988-09-28
1989-07-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354408, G01J 120
Patent
active
048516570
ABSTRACT:
A focus condition detecting device for a camera is disclosed. The device provides first and second image sensors for calculating correlations between images each having passed through an objective lens of the camera. A plurality of image detecting blocks are defined on the first image sensor in order to execute correlation calculations with respect to each block for detecting focus conditions. A focus condition which indicates the focus condition among those obtained from the correlation calculations with use of each block is employed as the most probable focus condition. In the present invention, correlation calculations unnecessary for finding the rearmost focus condition are omitted.
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U.S. Ser. No. 893,101, pending in Group 257.
U.S. Ser. No. 735,569, pending in Group 255.
Hamada Masataka
Ishida Tokuji
Karasaki Toshihiko
Norita Toshio
Taniguchi Nobuyuki
Allen Stephone B.
Minolta Camera Kabushiki Kaisha
Nelms David C.
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