Electronic device with trackball user input
US6480185B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1999 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Jul 28, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/233
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A portable radio telephone comprising a housing, a transceiver located in the housing, a controller connected to the transceiver, a display connected to the controller, and a user input device connected to the controller. The user input device comprises a trackball movably connected to the housing and at least one trackball rotational position sensor connected to the controller for sensing rotational movement of the trackball. The sensor includes a roller which rides against an exterior surface of the trackball. The user input device is configured to provide biased stepwise movements of the roller as the trackball is rotated by a user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.