08698942 cites 15 patents.

A focus detection apparatus includes: a photoelectric conversion unit of a charge accumulation type, including a plurality of sensors; an accumulation controller for controlling charge accumulation of the photoelectric conversion unit; an accumulation time measuring unit for measuring accumulation time; a correction computing unit for performing correction computing of a photoelectric conversion signal; and a focus detection computing unit for performing focus detection computing. The accumulation controller detects a signal of accumulation completion in a first sensor of the plurality of sensors, and then forces sensors except the first sensor to terminate the charge accumulation. The correction computing unit performs the correction computing of the photoelectric conversion signal based on first accumulation time that is accumulation time of the first sensor and second accumulation time that is different from the first accumulation time.

Title
Focus detection apparatus
Application Number
13/205816
Publication Number
8698942 (B2)
Application Date
August 9, 2011
Publication Date
April 15, 2014
Inventor
Shingo Isobe
Utsunomiya
JP
Agent
Rossi Kimms & McDowell
Assignee
Canon Kabushiki Kaisha
JP
IPC
G03B 13/02
G03B 13/00
H04N 5/335
H04N 3/14
H04N 5/232
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