The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 2013
Filed:
Jan. 04, 2012
Daisuke Inoue, Ebina, JP;
Hidekazu Takahashi, Zama, JP;
Daisuke Inoue, Ebina, JP;
Hidekazu Takahashi, Zama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A low cost and high speed AF sensor is realized by increasing AF speed without providing a sensor dedicated for a large de-focusing AF. The AF sensor has two sensors each including a plurality of photoelectric conversion elements and detects a focus based on signals read from the sensors. The two sensors each includes a plurality of linear sensorstoThe two sensors each has a plurality of accumulation controlling circuits (PB detection circuitstoand accumulation decision circuitsto) for controlling the accumulation time of the photoelectric conversion elements and a plurality of scanning circuits (shift registersto) for reading out output signals from the photoelectric conversion elements. The AF sensor has a first mode in which the accumulation time of each linear sensor in the two sensors is independently controlled to independently read a signal output and a second mode in which the accumulation time of the linear sensors in the two sensors is collectively controlled to read a signal output.