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Optical position detecting unit and optical coordinate input unit utilizing a sub-portion of a M-sequence pattern

  • US 5,499,098 A
  • Filed: 03/22/1994
  • Issued: 03/12/1996
  • Est. Priority Date: 03/23/1993
  • Status: Expired due to Term
First Claim
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1. An optical position detecting unit comprising:

  • a light-receiving means including a pixel array forming a light-receiving region for outputting signals through pixels of said pixel array which detect light;

    a pattern member disposed in front of said pixel array having a pattern with a specific characteristic such that an arbitrary sub-portion of said pattern contains a digital code indicating coordinate information concerning a position of the arbitrary sub-portion in said pattern, wherein when a sub-portion of said pattern is projected onto said light-receiving region by an incident light beam, direction of incidence of said light can be determined by a use of the digital codes contained in an image of said sub-portion formed on said light-receiving region; and

    a signal processing means for processing the signals outputted from the pixels and thereby extracting information concerning the direction of incidence of said light beam, the processing of the signals including a process of extracting bits forming said digital code contained in the image of said sub-portion from the signals outputted from the pixels.

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