Stylus/digitizer combination with elongate reflectors and linear

Details Stylus/digitizer combination with elongate reflectors and linear Stylus/digitizer combination with elongate reflectors and linear

1991-09-24

1992-11-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340707, G01V 904

Patent

active

051645858

ABSTRACT:
A digitizer/stylus combination comprises a digitizer board and a stylus, thereby the stylus operating on the digitizer board and generating a corresponding image on a screen of a personal computer. The stylus has an LED (light emitting diode) disposed thereon and emits infrared light which includes a series of light spots. The digitizer board has a pair of reflectors disposed in two adjacent sides thereof, a pair of focusing lenses disposed opposite to the reflectors for focusing the light from the reflectors and a pair of CCD image receivers disposed behind the focusing lenses respectively for receiving an X beam and Y beam emitted from a light spot, thereby obtaining a real position of a light spot. The stylus further comprises two keys for application software use.

REFERENCES:
patent: 4517559 (1985-05-01), Deitch et al.
patent: 4936683 (1990-06-01), Purcell

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