Optical digitizer and display means for providing display of ind

Details Optical digitizer and display means for providing display of ind Optical digitizer and display means for providing display of ind

1998-02-13

2000-08-08

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250221, 25055938, 341 5, 178 1809, 345173, 345175, G01N 2186

Patent

active

06100538&

ABSTRACT:
An optical digitizer is constructed for determining a position of a pointing object projecting a light and being disposed on a coordinate plane. In the optical digitizer, a detector is disposed on a periphery of the coordinate plane and has a view field covering the coordinate plane for receiving the light projected from the pointing object and for converting the received light into an electric signal. A processor is provided for processing the electric signal fed from the detector to compute coordinates representing the position of the pointing object. A collimator is disposed to limit the view field of the detector below a predetermined height relative to the coordinate plane such that through the limited view field the detector can receive only a parallel component of the light which is projected from the pointing object substantially in parallel to the coordinate plane. A shield is disposed to enclose the periphery of the coordinate plane to block a noise light other than the projected light from entering into the limited view field of the detector.

REFERENCES:
patent: 3727069 (1973-04-01), Crittenden, Jr. et al.
patent: 4205304 (1980-05-01), Moore
patent: 4855590 (1989-08-01), Bures et al.
patent: 4873398 (1989-10-01), Hubby, Jr.
patent: 4936683 (1990-06-01), Purcell
patent: 5164585 (1992-11-01), Lieu
patent: 5196835 (1993-03-01), Blue et al.

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