G - Physics – 01 – B
Patent
G - Physics
01
B
340/135.1
G01B 11/00 (2006.01) G06F 3/033 (2006.01)
Patent
CA 1239205
ABSTRACT OF THE INVENTION An optical position indicating apparatus having a light source, dectector means for detecting the presence of light and producing an electrical output in response thereto, reflecting means for reflecting light from the light source across a target zone, and retroreflecting means for reflecting the light incident thereupon along a path substantially coincident with the path of incidence of the light. The retroreflecting means comprise a plurality of retroreflective assemblies, the reflecting means and the plurality of retroreflective assemblies are substantially disposed about the target zone and limiting means limit the de- tector means to a finite viewing range so that rotation of the detector means effects scanning of the target zone. The detector means is capable of measuring angular displacement from a refer- ence so that presence of an opaque object within the target zone will register upon the detector means as a plurality of shadows thereby resulting in absence of electrical output from the detect- or means for each of the plurality of shadows, whereby the loca- tion of the opaque object within the target zone can be deter- mined in two dimensions by geometric calculations involving angu- lar displacements of the plurality of shadows.
450278
Meredith & Finlayson
Wells-Gardner Electronics Corporation
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