Patent · US Expired

Beam combining optical element

US6236511A · kind A · utility

94Cited by
2References
20Claims
0Family size

Assignee

Inventor

Key dates

Filing dateMar 20, 2000
Grant dateMay 22, 2001
Priority date—
Expiry dateMar 20, 2020

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B2027/0125
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

An optical combiner with a Fresnel lens having a Fresnel surface coated with a thin film spectrally selective reflective coating configured to reflect light within a first wavelength range, and transmit light within a second wavelength range is provided. The optical combiner also includes a covering which covers the Fresnel surface and the reflective coating to provide a generally planar surface which is substantially parallel to a similarly planar exterior surface of the Fresnel lens. The covering may take the form of an optical adhesive (or of a second Fresnel lens) with an index of refraction which substantially matches the index of refraction of the Fresnel lens.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.