Objective for a projection apparatus, and corresponding front-projection or backprojection apparatus
US7488077B2 · kind B2 · utility
1Cited by
6References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 4, 2004 |
| Grant date | Feb 10, 2009 |
| Priority date | — |
| Expiry date | Jun 28, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to a projection objective comprising at least one lens and intended to transmit a divergent light beam onto a flat screen. A hyperbolically shaped mirror is oriented so as to receive, on its convex face, the light emanating from the lens.The invention also relates to a corresponding projection apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.