Trackball having single emitter-detector detecting chopper wheel

Details Trackball having single emitter-detector detecting chopper wheel Trackball having single emitter-detector detecting chopper wheel

1995-06-06

1997-07-01

Powell, Mark R.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

345166, G06F 3033

Patent

active

056443374

ABSTRACT:
A simplified trackball arrangement utilizes a single IR emitter-detector combination for determining the distance and direction of movement of a chopper wheel. The chopper wheel has a plurality of slots for interrupting the infrared path between the emitter-detector combination. The distance travelled by the trackball is a function of the number of slots interrupting the emitter-detector combination IR path. The slots are arranged in a distinctive 1-2-3 pattern such that the direction of rotation may be determined by a pattern detector sensing a 1-2-3 or a 3-2-1 pattern to the IR beam interruptions.

REFERENCES:
patent: 4814553 (1989-03-01), Joyce
patent: 4899053 (1990-02-01), Lai et al.
patent: 5090812 (1992-02-01), Jungwirth
patent: 5384460 (1995-01-01), Tseng
patent: 5446481 (1995-08-01), Gillick et al.
patent: 5457479 (1995-10-01), Cheng
patent: 5486925 (1996-01-01), Sano et al.
patent: 5517211 (1996-05-01), Kwang-Chen

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