Hand-supportable imaging based bar code symbol reader employing automatic light exposure measurement and illumination control subsystem integrated therein
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United States of America Patent
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Feb 17, 2009
Grant Date -
Oct 5, 2006
app pub date -
Nov 15, 2004
filing date -
Nov 13, 2003
priority date (Note) -
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Abstract
A hand-supportable digital imaging-based bar code symbol reading device comprises: an IR-based object presence and range detection subsystem; a area-type image formation and detection subsystem having an image capture modes of operation; a multi-mode led-based illumination subsystem for providing a narrow-band field of illumination; an automatic light exposure measurement and illumination control subsystem; an image capturing and buffering subsystem; a image-processing bar code symbol reading subsystem; an input/output subsystem; and a system control subsystem integrated with each of the above-described subsystems. The automatic light exposure measurement and illumination control subsystem has a light collecting element and a photodiode arranged within the hand-supportable housing, wherein incident illumination is collected from the predetermined portion of the FOV using the light collecting element, and then focused upon the photodiode for detection of the intensity of incident illumination and subsequent processing by the automatic light exposure measurement and illumination control subsystem.
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