Ultra-wide angle micrographic lens
US4682863A · kind A · utility
2Cited by
1References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1985 |
| Grant date | Jul 28, 1987 |
| Priority date | — |
| Expiry date | Aug 26, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wide-angle lens covering a half angle of 33 degrees and capable of being focussed over a range of 7.4X to 30X, with a satisfactory resolution and distortion at 100% diagonal of under 0.2% at all reductions substantially extends the usefullness of such a micrographic lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.