Apparatus and method in which a plurality of detectors generating signals with different periods are used to detect the absolute position of a moving member
US4611269A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1983 |
| Grant date | Sep 9, 1986 |
| Priority date | — |
| Expiry date | Nov 15, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/003
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and a process for detecting an absolute positional value relating to mechanical movement of a member to be measured from a reference point. The apparatus includes a detecting means with a plurality of detectors having periods which are different from one another. Each detector generates an electric signal having a period corresponding to the movement of the member. The signals are stored in a memory. Then, the absolute value of mechanical movement between one of the detectors and the member is specified by using two values. The first value is derived by multiplying the period of the signal corresponding to the one detector by an integer N. The second value is stored in the memory and corresponds to the one detector's partial movement which is less than one period thereof. The value of the integer is decided by using periods and stored values corresponding to other detectors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.