Optical system
US6433937B1 · kind B1 · utility
23Cited by
14References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 13, 2000 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Mar 13, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/2484
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical system includes a first lens unit, a second lens unit, and a third lens unit. The second lens unit is movable. By moving the second lens unit, astigmatism due to the first lens unit and the second lens unit is corrected and astigmatism due to the second lens unit and the third lens unit is corrected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.