Wheel driver and portable electronic device having the same
US9148165B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 9, 2009 |
| Grant date | Sep 29, 2015 |
| Priority date | — |
| Expiry date | Mar 15, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/85
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pattern wheel driver is provided. The pattern wheel driver includes a rotatable pattern wheel with patterned regions repeatedly formed on the pattern wheel. Each of the patterned regions has a plurality of patterns. Each of the plurality of patterns has a different width. The pattern wheel driver also includes a detector for detecting the plurality of patterns, mounted at a position where the patterned regions of the pattern wheel pass when the pattern wheel rotates. The pattern wheel driver also includes an encoder for producing a signal indicating whether the pattern wheel rotates in a forward direction or a reverse direction based on signals produced by the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.