Transparent screen, projection display device, and method of receiving control signal light
US8002482B2 · kind B2 · utility
2Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 2009 |
| Grant date | Aug 23, 2011 |
| Priority date | — |
| Expiry date | Sep 13, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/60
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A transparent screen is constructed in such a way that a plurality of Fresnel prisms 12d each of which is smaller than a plurality of Fresnel prisms 12a and has a shape approximately similar to that of each of the plurality of Fresnel prisms 12a are arranged in a sawtooth shape on a non-light incidence surface portion of a Fresnel lens 12 on a light incidence side to which any image light PB applied from a projector 1 is not applied directly because blocked by a Fresnel prism 12a placed frontwardly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.