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Hand-held scanner with a speed control device

  • US 4,703,186 A
  • Filed: 07/11/1985
  • Issued: 10/27/1987
  • Est. Priority Date: 07/12/1984
  • Status: Expired due to Term
First Claim
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1. A hand-held scanner moved on a document by a motive force given by an operator for inputting an image on the document, comprising:

  • a scanning unit comprising a light source for emitting light to irradiate the document, and means for converting reflected light from the document to electric signals;

    a guide roller mounted on the scanning unit and rolling on the document by the motive force given by the operator to move the scanning unit; and

    speed control means coupled to the guide roller for producing a resistance force in a direction opposite to the direction of rotation of the guide roller when the guide roller is rolled on the document and the speed of rotation of the guide roller exceeds a predetermined rotating speed thereby controlling the scanner to move at a constant speed.

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