Phase-shift photoelectric encoder
US6956200B2 · kind B2 · utility
3Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2004 |
| Grant date | Oct 18, 2005 |
| Priority date | — |
| Expiry date | Jan 29, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/301
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A scale generates a periodic light-intensity distribution pattern having a pitch upon irradiation by emission light from a light source. Light-detecting element groups are shifted relative to the scale to generate phase signals having fixed phase differences. Light-detecting elements are adjacently positioned to have the same phase to form each light-detecting element group. Area centers of gravity on a phase axis of the light-detecting element groups having a fixed phase difference are made coincident with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.