Interpolating encoder utilizing a frequency multiplier
US7262714B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 2005 |
| Grant date | Aug 28, 2007 |
| Priority date | — |
| Expiry date | Dec 1, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/34792
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An encoder having a detector and an optical system that generates an image of a code strip on the detector is disclosed. The image includes a plurality of light and dark stripes, the detector generating a plurality of sinusoidal signals differing in phase from one another as the code strip moves relative to the detector. Each sinusoidal signal cycles through one period when the code strip moves a distance equal to one light stripe and one dark stripe with respect to the detector. A frequency multiplier generates a plurality of frequency multiplied signals. The encoder utilizes a signal interpolator that defines a plurality of position locations utilizing the frequency multiplied signals, there being at least 5 such points corresponding to the code strip moving a distance equal to one light stripe and one dark stripe with respect to the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.