Display instrument using optical collimation
US4225215A · kind A · utility
15Cited by
2References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1978 |
| Grant date | Sep 30, 1980 |
| Priority date | — |
| Expiry date | Apr 28, 1998 |
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 projected images of the luminous objects corresponding to data are reflected by the glass into the observer's line of sight. A semi-transparent optical mirror is arranged parallel to the glass at a greater distance from the optical lens, to provide an enlargement in elevation of the original pupil as defined by the outline of the image of the lens through the glass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.