Photoelectric encoder having improved light-emitting and photoreceptive sections
US6794638B2 · kind B2 · utility
3Cited by
2References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 4, 2002 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Mar 6, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/3473
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flat illuminant emits a beam of light toward a reflective scale having predetermined reference gratings formed thereon. A photoreceptive module is placed at a location between the flat illuminant and the reflective scale and closer to the flat illuminant. The photoreceptive module includes an array of photoreceptive devices, which also serves as illuminant-side gratings for partially shielding the beam from the flat illuminant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.