×

Lighting device, lens, system and method

  • US 9,851,069 B2
  • Filed: 09/13/2013
  • Issued: 12/26/2017
  • Est. Priority Date: 09/20/2012
  • Status: Expired due to Fees
First Claim
Patent Images

1. A lighting device comprising at least two optical devices associated with a light source, each optical device comprising a surface with a plurality of micro-sized facets having a size in between 25 μ

  • m to 250 μ

    m, each facet having a normal vector defining a respective orientation of the facet, an average of the normal vectors for all said plurality of facets in one of the optical devices defining an optical axis for said one of the optical devices;

    wherein each of the optical devices is configured to project light from the light source along its optical axis to form an image pattern on a display screen, andwherein the image pattern of one of the optical devices overlaps with the image pattern of another one of the optical devices by superposition,wherein each facet for all of said plurality of facets in one of the optical devices has a tilt angle with respect to the optical axis for said one of the optical devices within a range determined by equation;

    α

    t<

    =0.8*α

    c, where α

    t is the tilt angle and α

    c is a critical angle for total internal reflection.

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