Code wheel for reflective optical rotary encoders
US4644156A · kind A · utility
112Cited by
1References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1985 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Jan 17, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/34707
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A code wheel for use in a reflective optical rotary encoder includes a code wheel body formed of a light-reflective material, and a photosensitive layer directly coated on a flat surface of the code wheel body and exposed to light to produce angularly spaced non-reflecting surfaces, thereby providing alternate reflecting and non-reflecting surfaces on the code wheel body. The speed and direction of rotation of the code wheel can be detected by radiating light onto the reflecting and non-reflecting surfaces and detecting light reflected by the reflecting surfaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.