Method of and apparatus for the automatic focusing of stereoscopic microscopes
US4025785A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 1975 |
| Grant date | May 24, 1977 |
| Priority date | — |
| Expiry date | May 6, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B21/247
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
For automatic focusing of a stereoscopic microscope a focusing beam of rays, preferably in the infrared range of wave length, is generated by a pulse light source, and focused on the object to be observed in the form of a small luminous area which is superimposed on the observation rays. The rays reflected back by the object along the divided paths of the observation rays are deflected from those paths and directed to impinge on separate photoelectric detectors which convert axial shifts of the object plane with respect to the microscope into a directionally dependent electric signal which controls a focusing motor to move the microscope to compensate for such shifts. A switch is provided to permit manual adjustment of focus preparatory to automatic adjustment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.