Low-cost light-weight head-mounted virtual-image projection display with low moments of inertia and low center of gravity
US5822127A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1997 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Apr 11, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0138
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A head-mounted display device (10) offers light weight, a low center of gravity, and low moments of inertia about the azimuthal and elevational axes of head movement. The display device (10) employs an angulated beam splitter mirror (16) disposed between a user's (22) eye (20) and an inner combiner surface (18a) of a visor (28). A projector (36) is carried laterally of the user's eye with a low center of gravity and a position close to the horizontal axis of elevational movement of the head. This projector (36) includes an image source (12) and an compact light-weight relay optics module (14) along with a projection fold mirror (30) disposed at eye level and laterally of the beam splitter mirror (16) to project image light to the beam splitter mirror (16). The beam splitter mirror (16) reflects the light onto the inner surface (18a) of the combiner (18) for reflection back through the beam splitter mirror (16) and to the user's eye (20). Alternative embodiments provide for color correction, or for monochrome image projection at even lighter weight. An alternative embodiment provides for both color correction and a weight nearly as light as the monochrome version by use of diffracti…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.