Positioning apparatus
US4410951A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1982 |
| Grant date | Oct 18, 1983 |
| Priority date | — |
| Expiry date | Aug 2, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/41352
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A positioning apparatus employing a piezo worm type shifting mechanism in which the position of a platform to be moved to a desired position is measured with a position measuring device and data representing the position thus measured is applied to a microprocessor. The microprocessor calculates the phase of a voltage corresponding to the distance through which the platform should be moved to arrive at the desired position. The digital output is subjected to digital-to-analog conversion and a pulsive voltage produced thereby the magnitude of which corresponds to the distance to be moved. The pulsive voltage is applied directly to expanding and contracting piezoelectric elements which move the platform. The platform is thereby positioned at the desired position at a high speed and with a high accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.