Macro lens
US5331465A · kind A · utility
130Cited by
1References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 27, 1992 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Nov 27, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A macro lens comprises first to third lens groups having positive powers and an aperture stop disposed the first and second lens groups. The first lens group, aperture stop and second lens group remain fixed with respect to one another and movable as one unit relative to the third lens group for focusing. The third lens group is stationary with respect to an image plane of the macro lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.