Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1996-10-23
1998-08-04
Le, Que
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25055938, 356375, G01V 904
Patent
active
057897395
ABSTRACT:
The invention relates to an optical detection device for determining the position of an indicator medium on or in front of a projection surface with an optical monitoring field arranged directly in front of or slightly spaced from the presentation surface parallel to the latter, wherein either at least one scanner is provided which transmits light beams in the plane of the monitoring field, which scans the monitoring field and delivers angle and distance measurements related to the respective position of the indicator medium in the monitoring field, or wherein, starting from two different positions, range and/or angle measurement devices are provided which transmit light beams in the plane of the monitoring field, and wherein the angular range scanned by each of the two range and/or angle distance measuring devices respectively embraces the whole monitoring field, and wherein the respective position of the indicator medium in the monitoring field can be computed from the range and angular values delivered by the range and/or angle measurement devices.
REFERENCES:
patent: 4762990 (1988-08-01), Caswell
patent: 4820050 (1989-04-01), Griffin
patent: 5148016 (1992-09-01), Murakami et al.
Le Que
Sick AG
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