Pointing device having improved automatic gain control and infor

Details Pointing device having improved automatic gain control and infor Pointing device having improved automatic gain control and infor

1992-05-21

1994-10-25

Oberley, Alvin E.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

345157, 359147, G09G 302

Patent

active

053593480

ABSTRACT:
An improved optical pointing device utilizing a moveable unit having a voltage-to-frequency converter (VFC). The VFC emits pulses with separation proportional to the angular rotative and/or translational position of the moveable unit, which pulses are applied to an LED of the moveable unit. A microcomputer in a base unit measures separation of the pulses received by a photodetector to determine the components of the angular rotative and/or translational position of the moveable unit. In accordance with another aspect, automatic gain control circuitry is located in the moveable unit, thereby eliminating the need for two-way communication to achieve consistency of operation in a prescribed space.

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Bassen, "An Optically Linked Telemetry Sys. for Use with Electromagnetic-Field Measurement Probes", Nov. 1978, pp. 483-488.

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