Apparatus including a mangin mirror for superimposing variable graphical and alphanumeric information onto the image plane of an optical viewing device
US5355224A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 16, 1992 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Sep 16, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF41G1/30
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
There is provided an improved optical viewing device (10) in which variable compass heading information (80) and stadiametric range measuring information (88), (106), (118) is superimposed upon the image of a scene viewed through a viewing optical system (13) within the device (10). A self-luminous display panel (36) displays the information in the form of graphical symbols and/or alphanumeric characters. A folding lens (38) reflects light from the display panel (36) to a correcting lens (40), which transmits the light to a reflecting means (41) or (52). The reflecting means (41) or (52) reflects the light to a mangin mirror (44) or (62), which reflects the light to a dichroic combiner (28) or (50). The dichroic combiner (28) or (50) transmits the light into the path of the viewing optical system (13) such that the information displayed on the display panel (36) is effectively superimposed upon the image of the scene viewed by the user. A dichroic coating on dichroic combiner (28) or (50) reflects light of wavelengths associated with the viewing optical system (13) and transmits light associated with the illuminated display panel (36). An alternative embodiment employs a holographi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.