Patent · US Active

Optical system for displaying magnified virtual image

US11619823B2 · kind B2 · utility

1Cited by
2References
9Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJul 2, 2020
Grant dateApr 4, 2023
Priority date—
Expiry dateJul 2, 2040

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B27/026
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

An optical system for displaying a magnified virtual image of an image emitted by a display to a viewer. The optical system includes first and second lenses facing each other and spaced apart by an air gap to define an optical cavity therebetween. The optical cavity includes a reflective polarizer disposed on a major surface of the first lens, and an optical stack disposed on a major surface of the second lens. The optical stack includes an absorbing polarizer, a first retarder layer, a partial reflector, and a second retarder layer disposed between the absorbing polarizer and the partial reflector. The first and/or second lenses is/are birefringent lens provided outside the optical cavity to control polarization.

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