Autofocusing system for microscope having contrast detection means
US4945220A · kind A · utility
65Cited by
29References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1988 |
| Grant date | Jul 31, 1990 |
| Priority date | — |
| Expiry date | Nov 16, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B21/26
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An autofocusing system for a microscope is disclosed. An autofocus target is placed between a colliminating lens and a relay lens of the microscope. The autofocus target contains a pattern of dark areas which are projected onto a specimen and reflected into a CCD camera array. The focus of the microscope is adjusted such that the variation in intensity of light through the pattern is maximized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.