×

Compact holographic illumination device

  • US 10,145,533 B2
  • Filed: 09/22/2016
  • Issued: 12/04/2018
  • Est. Priority Date: 11/11/2005
  • Status: Active Grant
First Claim
Patent Images

1. An illumination device comprising in series:

  • at least first and second light sources;

    a lens;

    a first grating layer;

    a second grating layer;

    a half wave plate;

    a third grating layer; and

    a fourth grating layer,wherein said third grating layer and said first grating layer have identical optical prescriptions and said fourth grating layer and said second grating layer have identical optical prescriptions,wherein each said grating layer is operative to diffract light from at least one source into an illumination direction,wherein said lens collimates and directs a first polarization of light from said first source into a direction at a first angle to said illumination direction and collimates and directs a first polarization of light from said second source into a direction at second angle to said illumination direction.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×