Hand position detecting device and apparatus including the device
US8023362B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2008 |
| Grant date | Sep 20, 2011 |
| Priority date | — |
| Expiry date | Jul 2, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C3/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A detection unit detects light passing through apertures provided in a seconds wheel, a center wheel and an hour wheel, respectively, which rotate on the same axis. The apertures in the seconds wheel include a circular aperture provided at a reference position therein, and two apertures provided separated by corresponding arcuate apertures of different lengths from the aperture on its opposite sides, respectively. By counting the number of light non-detection events the detection unit encounters due to the light blocking area covering the detection unit, the rotational position of the seconds wheel is detected accurately and securely.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.