Optic and assembly for reduced reflections
US11181735B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2019 |
| Grant date | Nov 23, 2021 |
| Priority date | — |
| Expiry date | Aug 22, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/015
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optic providing reduction in secondary or ghost images includes a beam splitter, a reflective surface, and at least one baffle therebetween. A transmissive surface may be located between the beam splitter and the reflective surface. The baffle is positioned to intercept internally reflected ghost rays while being substantially parallel to outside light rays along a line of sight of the viewer, permitting use in see-through optics. The baffles may be formed of diffusing structures, light absorbing material, and combinations of both. Baffles intercept and scatter or absorb ghost rays to the exclusion of projected image rays that provide a desired projected image which are internally reflected through the optic. An assembly including such optic integrated with a wearable vision system, such as a head-mounted display, is also disclosed for near-eye application.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.