Optical coordinate input apparatus and position indicator thereo

Details Optical coordinate input apparatus and position indicator thereo Optical coordinate input apparatus and position indicator thereo

1990-10-02

1992-09-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340709, 359727, G04V 904

Patent

active

051480166

ABSTRACT:
The position of an object including a retroreflector is determined by scanning first and second optical beams toward an axis on a planar surface from spaced sites on opposite sides of the axis. The scanned beams are incident on and reflected from the retroreflector along coincident first and second paths between the sites and the retroreflector. Indications are derived of first and second angles between a baseline between the sites and the first and second paths extending between the sites and the retroreflector. In response to the known distance between the sites and the derived indications of the first and second angles a two-coordinate direction indication of the retroreflector position is derived. The retroreflector refracts and reflects the scanned optical beams incident thereon and refracts the beams reflected thereby.

REFERENCES:
patent: 2592329 (1952-04-01), Picard et al.
patent: 3632191 (1972-01-01), Cox
patent: 4660929 (1987-04-01), Sick

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