Multi-axis trackball
US4933670A · kind A · utility
140Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 21, 1988 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Jul 21, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0312
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A first electromechanical transducer (40) generates a first electrical signal indicative of rotation of a ball (A) relative to a first axis. A second electromechanical transducer (50) generates a second electrical signal indicative of rotation of the ball relative to a second axis. A third electromechanical transducer (60) generates a third electrical signal indicative of rotation of an annular ring (12) around the periphery of the ball, i.e. a third axis. A resolver circuit (D) converts the first, second, and third electrical signals into an indication of movement or position along the first, second, and third axes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.