Photoelectric input apparatus

Details Photoelectric input apparatus Photoelectric input apparatus

G - Physics

06

K

354/25, 354/55

G06K 11/06 (2006.01)

Patent

CA 1196104

ABSTRACT A photoelectric touch input panel has a plurality of crossed light beams which are broken by an object, the position coordinates of which are identified as outputs. Two spaced apart beam surfaces are provided, and the inter- relationship between the beams in the two planes is em- ployed to distinguish between interrupting objects on the basis of their size, attitude, and velocity characteris- tics. The number of beams broken in any beam plane is counte- to determined the relative size of the object, or to determine the center line of the interrupting object. The beams in any beam plane are selected in accordance with the relative significance of the various beams, and interrupted beams are pulsed more rapidly than non- interrupted beams. The light-emitting devices of the . various beam planes are constructed as an integral unit. The control system of the touch input panel is adapted for use in monitoring the size, shape, and activity of objects within a space defined by plural beam planes, independently of the touch input panel.

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