Virtual image display device
US5999147A · kind A · utility
66Cited by
13References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1997 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Nov 28, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0132
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A head-coupled display device for use in presenting electronically generated visual images to a viewer. The device includes a headpiece worn by a viewer, and an image display screen mounted in the headpiece for presenting electronically generated images. A fresnel lens is positioned adjacent the screen for focusing images from the screen at a selected position for viewing as a virtual image. The lens has a set of concentric converging rings whose surface curvatures act to minimize rectilinear distortion of the virtual images perceived by the viewer over the entire field of view of the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.