Light-pen system for projected images

Details Light-pen system for projected images Light-pen system for projected images

1991-01-18

1992-05-19

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340706, 340709, G09G 302

Patent

active

051152304

ABSTRACT:
A light-pen system for use in connection with a video display installation includes a projector for receiving an externally generated video signal and for projecting a video image onto a screen. Illustratively, the light-pen system includes a source of a beam of radiation for forming a spot at a desired location on the screen. The source of radiation may provide a well collimated visible optical beam or colinear beam of visible and infrared radiation. An adjunct video camera is used to detect the location of the spot on the screen and to produce an output signal indicative of the location of the spot. A host computer or graphics overlay generator receives the position indicative output signal and modifies the externally generated video signal so as to modify the displayed video image.

REFERENCES:
patent: 3183773 (1965-05-01), Weinstein
patent: 3775005 (1973-11-01), Szabo
patent: 3885096 (1975-05-01), Inuiya
patent: 4565999 (1986-01-01), King et al.
Hoffman, "Exact Position Detection with Finger Point and Feedback", IBM (TDB) vol. 23, No. 6, Nov. 1980.

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