Low magnification projection objective lens
US4753523A · kind A · utility
3Cited by
0References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 20, 1986 |
| Grant date | Jun 28, 1988 |
| Priority date | — |
| Expiry date | Aug 20, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A low magnification projection objective lens for use in projection examination instrument. The projection objective lens comprises three lens units. The first unit is a converging lens unit composed of a positive lens component on the image side and a negative lens component on the object side, the second unit is a diverging lens unit composed of a negative lens component on the image side and a positive lens component on the object side and the third unit is a converging lens unit composed of a positive lens component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.