Adjustable microscope focusing drive
US4930882A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1988 |
| Grant date | Jun 5, 1990 |
| Priority date | — |
| Expiry date | Nov 30, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B21/242
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an electromotively adjustable focusing system for a microscope, a rotatable and axially moveable knob controls both the coarse and fine adjustments of the object stage. The knob is mechanically connected to a tacho-generator producing an output voltage responsive to the direction and amount of rotation of the knob. The knob is also mechanically joined to a switch, which is opened or closed by axial movement of the knob in opposite directions. The closing of the switch causes a focus control circuit to provide to the focusing motor a signal that causes coarse (rapid) focusing. When the switch is opened, however, the motor provides fine adjustment of the object stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.