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MARK SENSING SYSTEM

  • US 3,553,438 A
  • Filed: 07/18/1969
  • Issued: 01/05/1971
  • Est. Priority Date: 07/18/1969
  • Status: Expired due to Term
First Claim
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1. A mark sensing system comprising:

  • a label containing a plurality of discrete code elements arranged in a predetermined coded pattern, said coded pattern including therein a unique coded acquisition target spaced from the remainder of the coded pattern and differing from the remainder of the coded pattern;

    first scanning means for scanning a predetermined area through which said label is arranged to pass and operative when the label is present in the predetermined area to scan the label and to derive an image thereof;

    second scanning means for receiving the image of the label derived by the first scanning means, said second scanning means being operative to scan the image of the label in a first geometrical scan pattern when the image of the label is received and in response to scanning the image of the unique coded acquisition target portion of the label to produce first electrical signals indicative of the presence of the label in the predetermined area, and also operative in response to a control signal to scan the image of the label in a second geometrical scan pattern differing from the first geometrical scan pattern, said second geometrical scan pattern generally conforming to the physical arrangement of the discrete code element comprising the remainder of the coded pattern, and in response to scanning the image of the remainder of the coded pattern of the label to produce second electrical signals representative thereof;

    control means operative in response to the first electrical signals to produce the control signal to cause the second scanning means to scan tHe image of the label in the second geometrical scan pattern and to produce the second electrical signals; and

    processing means for decoding the second electrical signals.

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