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Device for controlling the position of an image in a head-up display

  • US 5,572,203 A
  • Filed: 06/07/1995
  • Issued: 11/05/1996
  • Est. Priority Date: 12/08/1992
  • Status: Expired due to Term
First Claim
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1. A device for verifying and correcting the position of a symbolic image, for use in head-up display systems which incorporate means for generating a symbolic image, said device comprising:

  • means for generating a luminous spot at a known position on a geometric surface on which said symbolic image is formed, said luminous spot emitting a light beam;

    a first collimating optical unit for collimating said symbolic image onto a combiner and said light beam onto a mirror fixed to a structure of said combiner;

    a first optical focusing system for focusing said light beam which is reflected from said mirror;

    a first position sensor having a light sensitive surface which receives said light beam focused by said first optical focusing system and generates a signal in accordance with a position of said light beam;

    first means for processing signals output from said first position sensor to thereby correct a position of said symbolic image;

    a second position sensor having a light-sensitive surface divided into a number of elements each of which emits a signal which varies in accordance with variations of an incident light beam; and

    second means for processing signals output by said second position sensor to thereby correct a position of said symbolic image, wherein said second collimating optical unit collimates an image of said light source onto said combiner, and said second optical focusing system focuses light emitted by said light source and reflected by said combiner onto said second position sensor.

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