Method and apparatus for producing signals corresponding to the position of a cursor
US5065145A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1989 |
| Grant date | Nov 12, 1991 |
| Priority date | — |
| Expiry date | Oct 6, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0421
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for indicating the position of a cursor on a surface in first and second different directions. The cursor is mounted on a member such as a gantry, and the gantry is guided for movement in the first direction on a carriage. The carriage is mounted for movement in the second direction on a member such as a rail. Radiation reflection strips extending and an acute angle with respect to one another are mounted on the gantry, and adapted to reflect light from a linear light source on said rail and extending in the second direction. Reflected light is sensed by a linear detector on said rail, for producing signals corresponding to the locations from which light was reflected. The coordinates of the cursor are determined by triangulation from these signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.