Registers – Coded record sensors – Particular sensor structure
Patent
1995-12-18
1998-11-03
Hajec, Donald T.
Registers
Coded record sensors
Particular sensor structure
235455, 235462, G06K 710
Patent
active
058312544
ABSTRACT:
An exposure control apparatus for use with optical readers, such as bar code readers, which utilize photosensitive image sensors. An illumination signal generating circuit generates an illumination signal having a magnitude that varies in accordance with the time averaged value of the illumination level at the image sensor. A window detecting circuit periodically samples the illumination signal to determine if that signal is or is not within a window of acceptability. Exposure period determining circuitry uses the output of the window detecting circuit to upwardly or downwardly adjust the value of a control variable as necessary to cause the illumination signal to approach, enter and remain within the window of acceptability.
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Gardiner Robert C.
Karpen Thomas W.
McEnery Dennis W.
Pettinelli John A.
Hajec Donald T.
Rodriguez Douglas X.
Welch Allyn Inc.
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