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Helmet mounted display system

  • US 5,257,094 A
  • Filed: 07/30/1991
  • Issued: 10/26/1993
  • Est. Priority Date: 07/30/1991
  • Status: Expired due to Fees
First Claim
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1. A wide field of view reflective composite holographic imaging element possessing optical power, comprising:

  • a) a curved optically transparent substrate having an outer reflection side curved to impart a desired optical power and having an inner side;

    b) a first holographic optical element reflective at a first wavelength, said first holographic element comprising a planar holographic mirror when said holographic optical element is formed into a planar configuration, said first holographic optical element being adhered at a first surface to said outer reflection surface and deformed to conform to said curved outer reflection side to have said desired optical power, said first holographic optical element having an outer surface opposite said first surface; and

    c) a second holographic optical element reflective at a second wavelength, said second wavelength being different from said first wavelength, said second holographic element comprising a planar holographic mirror when said second holographic optical element is formed into a planar configuration, said second holographic optical element being adhered to said outer surface of said first holographic optical element and deformed to conform to said curved outer surface to have said desired optical power, whereby the focal point and orientation of said deformed first and second holographic optical elements can focus images which are in registration with one another.

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