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Compact two-plane optical device

  • US 6,833,955 B2
  • Filed: 10/09/2001
  • Issued: 12/21/2004
  • Est. Priority Date: 10/09/2001
  • Status: Expired due to Fees
First Claim
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1. An optical device for enlarging an eye box, the optical device comprising:

  • (a) a first optical expander being carried by, or formed in, a first light-transmissive substrate engaging a first plane; and

    (b) a second optical expander being carried by, or formed in, a second light-transmissive substrate engaging a second plane being spaced apart from said first plane;

    said first and said second optical expanders being designed and configured such that;

    (i) at least a first portion of light entering said first light-transmissive substrate experiences a substantially total internal reflection, diffracted by said first optical expander and exits from said first light-transmissive substrate expanded in a first dimension; and

    (ii) at least a second portion of said first portion of light enters said second light-transmissive substrate, experiences a substantially total internal reflection, diffracted by said second optical expander and exits from said second light-transmissive substrate expanded in a second dimension;

    such that light rays of said light entering said first light-transmissive substrate are multiplied into a plurality of substantially parallel outgoing rays exiting said second light-transmissive substrate, hence enlarging an eye box of the optical device in both said first and said second dimensions.

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