Position detecting and time measuring device providing measurement finer than a clock signal period
US5382899A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1992 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Nov 19, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/24404
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
First absolute position detecting section generates an A.C. output signal having a phase electrically shifted in accordance with a position of a moving object, and samples a counted value of a counter circuit in response to an electrical phase change at a zero cross time point of the A.C. output signal, so as to output the sampled counted value of the counter circuit as absolute position data of the moving object. Second absolute position detecting section generates one or more delayed clock signals that are delayed from a clock signal on the basis of which the counter circuit counts up by an amount of time smaller than one period of the clock signal, and utilizes the one or more delayed clock signals to measure the zero cross time point of the A.C. output signal in accordance with a unit time smaller than the one period of the clock signal, so as to output, as the absolute position data, the measured time point after having been added to the sampled counted value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.