Display instrument using optical collimation
US4111527A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1977 |
| Grant date | Sep 5, 1978 |
| Priority date | — |
| Expiry date | Jun 17, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0169
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A display instrument using optical collimation for projecting data into the line of sight of an observer, comprising an optical lens which projects images of luminous objects focused at infinity onto a transparent combining glass. The luminous objects corresponding to data be displayed are positioned in the focal zone of the lens. The images are reflected by the glass into the observer's line of sight. A reflective optical element is arranged parallel to the glass, in the space contained between the optical lens and the field of vision of the observer, to provide an additional optical pupil which forms in conjunction with the original pupil of the instrument an enlarged pupil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.