Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-02-24
1999-09-07
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023116, 369109, G01D 534, G11B 700
Patent
active
059490667
ABSTRACT:
A position sensor and a method of creating the same which sensor has an incoherent light source, multiple light detectors and a sinusoidal pattern that can be directly installed to the sensor. The light source and detectors are positioned along the axis of motion of the element whose position is to be determined. In a device containing such a movable target element, light from the sensor is directed through the sinusoidal pattern to and reflected from a periodic reflection profile to create detectable sinusoid signals that can be used for positioning purposes.
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Stephen W. Farnsworth, & Scott D. Wilson, Diffractive Optical System For Tracking On Floptical.RTM. Disks SPIE vol. 1690 Design of Optical Instruments (1992), 72-79.
Perry David Martin
Rice James Patrick
Shuman Curtis Alan
Van Laanen Peter Joseph
O.R. Technology, Inc.
Pyo Kevin
Schatzel Thomas E.
Westin Edward P.
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