Digitizer for locating the position of a stylus point on a writi

Details Digitizer for locating the position of a stylus point on a writi Digitizer for locating the position of a stylus point on a writi

1978-10-11

1980-08-12

Atkinson, Charles E.

Boots, shoes, and leggings

364559, 364516, 178 19, 250216, 250236, G01B 1500, G01C 1502

Patent

active

042176492

ABSTRACT:
A Digitizer for determining the location of a point of contact between a stylus and a surface comprising a rotating light projector for projecting a single light beam having two spaced apart light boundaries, a light sensing stylus spaced from the rotating light projector for sensing the passing of the light boundaries emitted from the rotating light projector, and a logic circuit connected between the rotating light projector, and the light sensing stylus for converting information coming from the rotating light projector, as to the angular position of the light beam and information coming from the sensing stylus, as to the time of the passing of the light boundaries, into digital information. The rotating light projector includes a rotating turntable having at least one light focusing lens thereon with a fixed shielded light source spaced from the turntable and cooperating with the rotating light focusing lens to produce a light beam having a predetermined angle of convergence. The light beam is projected toward the light sensing stylus which is in contact with a writing surface.

REFERENCES:
patent: 3457646 (1969-07-01), Schwemin
patent: 3809893 (1974-05-01), Dobras
patent: 3911270 (1975-10-01), Traub
patent: 3917955 (1975-11-01), Inuiya
patent: 4081603 (1978-03-01), Davis et al.

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