Projection optical system
US7411737B2 · kind B2 · utility
5Cited by
13References
22Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 18, 2005 |
| Grant date | Aug 12, 2008 |
| Priority date | — |
| Expiry date | Oct 18, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B17/0848
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projection optical system for projecting, while enlarging, an image formed on an image formation surface onto an image projection surface from an oblique direction relative thereto has at least three optically powered reflective surfaces and a refractive lens surface having a non-rotation-symmetric free-form curved surface and disposed between the first and second reflective surfaces as counted from the image formation surface side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.