The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 29, 2014
Filed:
May. 17, 2012
Carl Brian Candiloro, Hudson, MA (US);
Brian Patrick Stokes, Windham, NH (US);
Robert T. Milkowski, Shirley, MA (US);
Carl Brian Candiloro, Hudson, MA (US);
Brian Patrick Stokes, Windham, NH (US);
Robert T. Milkowski, Shirley, MA (US);
Nutfield Technology, Inc., Hudson, NH (US);
Abstract
An annular position detection method provides a plurality of light emitters on a first imaginary circle centered on an axis, the emitters directing individual, well-defined, overlapping light beams to a pair of light detectors positioned on a second imaginary circle centered on that axis. The detectors include pairs of diametrically opposite photosensors producing outputs depending upon the areas thereof exposed to light from the emitters. A light blocker is rotatably mounted on the axis so that the blocker blocks light to different extents of the photosensors depending upon its orientation about the axis. The outputs from all of the photosensors are processed to produce a position signal that varies with the angular position of the blocker and the relative intensities of the emitters are adjusted so that the position signal is substantially linear at all operative angles of the blocker. Apparatus for practicing the method is also disclosed.