Virtual image display apparatus
US4294515A · kind A · utility
Inventor
Key dates
| Filing date | Mar 23, 1979 |
| Grant date | Oct 13, 1981 |
| Priority date | — |
| Expiry date | Mar 23, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0169
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A virtual image display device for alpha-numeric and pictorial information. A concave spherical mirror segment magnifies and reflects an image from an image source. The image source is mounted between the focus of the mirror and the said mirror and parallel to its optical axis. The virtual image thereby formed is visible to the viewer in front of the mirror. In related embodiments, the concave mirror segment can be made partially reflective and placed in front of a camera lens to allow a camera to photograph through it. A planar mirror can also be included to fold the light path of the display and thereby reduce the size of the apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.