APPARATUS FOR DETECTING IN-FOCUS STATE
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United States of America Patent
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Issued Date -
May 26, 2011
app pub date -
Nov 18, 2010
filing date -
Nov 20, 2009
priority date (Note) -
Abandoned
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Abstract
An apparatus that detects an in-focus state has a plurality of line sensors arranged on a projection area of an optical image-forming system, each line sensor comprising photoelectric converters an storages; a plurality of monitor sensors arranged on the projection area, each monitor sensor being adjacent to a corresponding line sensor and monitoring a quantity of light incident on a corresponding line sensor; an accumulation termination detector that detects a termination timing of an accumulation of electric charge in the plurality of line sensors on the basis of monitor signals output from the plurality of monitor sensors; an electric charge transfer processor that transfers electric charges accumulated in the photoelectric converters to the storages; a signal output processor that reads electric charges temporarily stored in the storages to output image signals corresponding to an object image; and an electric charge transfer controller that adjusts an electric charge transfer time of a target line sensor in response to intensity of light incident on a corresponding monitor sensor.
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