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Dataform readers having controlled and overlapped exposure integration periods

DC
  • US 5,521,366 A
  • Filed: 10/31/1994
  • Issued: 05/28/1996
  • Est. Priority Date: 07/26/1994
  • Status: Expired due to Term
First Claim
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1. A dataform reader comprising:

  • an array of sensor elements readable to provide image signals, including a plurality of lines of sensor elements;

    an array control assembly coupled to said array and arranged to initiate exposure of a line of sensor elements by causing sensor elements of said line to be set to a reference potential in response to an exposure start signal, and to cause image signals to be read from sensor elements of said line in response to an exposure stop signal and coupled to an output point; and

    an exposure control system coupled to said output point and successively responsive to the level of image signals read from selected lines of sensor elements to determine an exposure period for at least one subsequent line of sensor elements based on the level of image signals from each said selected line, and arranged to provide said exposure start and stop signals to said array control assembly to implement said exposure periods in a sequence causing the exposure period for one line of sensor elements to overlap the exposure period for at least one subsequent line of sensor elements.

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