Catadioptric projection optical system, exposure apparatus having the same, device fabrication method
US7317571B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2005 |
| Grant date | Jan 8, 2008 |
| Priority date | — |
| Expiry date | Nov 18, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/70225
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A catadioptric projection optical for forming an image of the intermediate image onto a second object, the catadioptric projection optical system include, a first dioptric group including a first lens group that has a positive refractive power and a second lens group that has a positive refractive power, a catadioptric group including a concave mirror and a third lens group that an incidence light and reflected light from the concave mirror pass, and a second dioptric group. A first deflective reflector is arranged between the first lens group and the second lens group. A second deflective reflector is arranged between the second lens group and the third lens group or between the third lens group and the second dioptric group. A first intermediate image is formed between the second lens group and the concave mirror. A second intermediate image is formed between the concave mirror and the second dioptric group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.