Pointing device with differential optomechanical sensing
USRE37878E1 · kind E1 · reissue
4Cited by
16References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1998 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Oct 19, 2018 |
Classification
- Technology area (CPC —)General
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.