Pointing device with differential optomechanical sensing
US5680157A · kind A · utility
34Cited by
6References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1992 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Aug 10, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/0333
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A pointing device including a ball engaging one or more shaft encoders, each shaft encoder having an encoding wheel, including a monolithic photosensitive array for detecting light pulses representative of rotary movement of the ball. The photosensitive array provides a plurality of resolutions and permits accurate tracking of rotary movement of the ball without need for a mask. Comparator and latch means operate on the output of the array and provides digital hysteresis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.