Refractor optical system
US4413891A · kind A · utility
10Cited by
2References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 27, 1980 |
| Grant date | Nov 8, 1983 |
| Priority date | — |
| Expiry date | Mar 27, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/12
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A refractor optical system having a new series of spherical and cylinder lenses substantially eliminates the irregular occurrence of additive errors when lenses spaced from the reference plane are used or more than two lenses are combined and permits correction for the significant additive errors by non-additive lens selection is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.