Patent · US Expired

Optical apparatus

US4261635A · kind A · utility

23Cited by
3References
5Claims
0Family size

Assignee

Inventor

Key dates

Filing dateMay 2, 1979
Grant dateApr 14, 1981
Priority date—
Expiry dateMay 2, 1999

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B2027/0145
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

Optical apparatus, such as head-up display apparatus, for superimposing visual information on an observer's view of a scene or object comprises a substantially flat transmission hologram through which the observer views the scene or object, the hologram being disposed substantially orthogonally to and midway along an axis between the observer's eye position and projection optics so as to deviate light from an image produced by the projection optics to the observer's eye position with minimal field aberrations.

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