Photoelectric position measuring system using gratings having specified dimensions to suppress harmonics
US5576537A · kind A · utility
24Cited by
11References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1994 |
| Grant date | Nov 19, 1996 |
| Priority date | — |
| Expiry date | Jul 7, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H29/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A light source which emits light in strips is provided for illuminating a scale of a photoelectric position measuring system. The light modulated by the scale is converted into a sinusoidal scanning signal by a scanning plate. The scanning plate is a semiconductor substrate structured in strips. The width (A) of the light-emitting areas and the width (B) of the interspersed non-emitting areas of the light source is such that defined harmonics are filtered out of the scanning signal. The scanning plate is of such configuration that further harmonics are suppressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.