System for driving a movable stage
US4577141A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1984 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Nov 27, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/41156
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In order to appropriately position a specimen within a view finder of a microscope, the stage supporting the specimen must be quickly and smoothly moved in all directions of two dimensions X and Y. According to the present invention, this can be accomplished by dividing a tilt angle of an operation lever of a joy stick into three regions, an insensitive band, a low velocity region and a high velocity region. For each of latter two regions, a relevant signal is produced by the joy stick and transferred to a microcomputer which controls stage driving motors by sawtooth pulse voltages. The velocities of X- and Y-stages are generally setted in the microcomputer so as to be high for the high speed region and low for the low speed regions, and movements in X- and Y-directions alternate by a short time interval, thus quick and smooth movements of stages being enabled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.