Wireless input device, for use with a computer, employing a mova

Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for crt display

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Details

345158, G09G 100

Patent

active

059459816

ABSTRACT:
The wireless computer input system uses a pen-type input device and a receiver. The pen-type input device includes an LED, at least one switch, a rechargeable battery, and a control circuit. The control circuit provides signals to the LED upon activation of the switch, and provides for power management functions allowing the pen to conserve power during idle periods. The receiver includes one or more light-detecting elements connected to position computation circuitry. The light-detecting element or elements are either a two-dimensional PSD, two one-dimensional PSDs or a four division photodiode. Optional lenses, optical filters, and apertured plates are positioned before the light-detecting element(s), improving the signal-to-noise ratio of the system. The computation circuitry receives the signals from the light-detecting element(s), digitizes them, and computes the coordinates of the pen which are output to a host computer. A recharging circuit, connected to the computation circuit, allows the pen to be recharged within the receiver or connected by a cord when the battery lacks sufficient power.

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Freepoint.about. Cordless Pen Mouse Brochure, Data Stream Corporation, Singapore, Nov. 1992.
Freepoint.TM. Reference Guide, Version 1.0, Data Stream Corp., Singapore, Ed. 1, 1992.
Photoreproductions of various commerically available computer stylus designs (2 pages).
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"AT&T seeks role in pen computing", Journal American, Aug. 16, 1993.

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