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Class Information
Number: 250/231.16
Name: Radiant energy > Photocells; circuits and apparatus > Optical or pre-photocell system > Light valve (e.g., iris diaphragm) > Actuated by dynamic external physical quantity > Shaft angle transducers > Incremental shaft readers; i.e., with means to generate increments of angular shaft rotation > Using phase difference of output signals from plural photodetectors
Description: Subject matter in which a signal proportional to the phase sum of, or difference between, outputs of the photodetectors is generated and is representative of the angular position or speed of the rotating shaft.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8710426 Encoder that detects positional information of a moving body generating interference fringes that move in opposite directions Apr. 29, 2014
8666261 Photoelectric encoder Mar. 4, 2014
8659448 Movement detection device Feb. 25, 2014
8637804 Rotary position encoder Jan. 28, 2014
8546747 Rotary encoder and optical apparatus Oct. 1, 2013
8546743 Encoder in which the relative displacement between the encoder scale and encoder head is detected Oct. 1, 2013
8513589 Indexed optical encoder, method for indexing an optical encoder, and method for dynamically adjusting gain and offset in an optical encoder Aug. 20, 2013
8497469 Rotary encoder that detects rotation angle Jul. 30, 2013
8492703 Lens aberration correction in a doubly telecentric displacement sensor Jul. 23, 2013
8487237 Rotary encoder and method of assembling the same Jul. 16, 2013
8476579 Indexed optical encoder, method for indexing an optical encoder, and method for dynamically adjusting gain and offset in an optical encoder Jul. 2, 2013
8476578 Rotary encoder and rotation mechanism including the same Jul. 2, 2013
8415610 Optical encoder having a single signal track and an optical detecting part with sine and cosine signals Apr. 9, 2013
8395535 Photoelectric encoder Mar. 12, 2013
8354815 Linear encoder, linear motor system, and method of manufacturing linear encoder Jan. 15, 2013
8309906 Absolute optical encoder with long range intensity modulation on scale Nov. 13, 2012
8288709 Optical encoder device Oct. 16, 2012
8188420 High resolution optical encoder systems having a set of light detecting elements each comprising a pair of complementary detectors (as amended) May. 29, 2012
8173951 Optical encoder comprising a main and reference light receiving portions with a three-phase signal generation for detecting displacement and direction of displacement of an incremental grating May. 8, 2012
8149324 Phase difference detection device, imaging apparatus, phase difference detection method Apr. 3, 2012
8097842 High resolution single track optical encoder Jan. 17, 2012
8044340 Encoder and light receiving device for encoder Oct. 25, 2011
8017904 Rotary encoder in which an absolute position is defined using reference mark signals produced by each of at least two readheads and method of operating the same Sep. 13, 2011
7995212 Optical displacement measuring device Aug. 9, 2011
7994470 Photoelectric encoder Aug. 9, 2011
7958620 Method of producing a rotary encoder Jun. 14, 2011
7943897 Optical encoder and electronic equipment May. 17, 2011
7907286 Optical position-measuring device Mar. 15, 2011
7876451 Position-measuring device with movable deflection device and grating and with stationary grating, light source, and detector Jan. 25, 2011
7875844 Absolute-type encoder and method for detecting absolute position Jan. 25, 2011
7732754 Optical encoder with amplitude correction Jun. 8, 2010
7718952 Information carrier May. 18, 2010
7638756 Photodetector array and codewheel configuration for flexible optical encoder resolution Dec. 29, 2009
7619537 Signal processing circuit for encoder Nov. 17, 2009
7612326 Angle-calculation apparatus and angle-calculation method for three-phase optical encoder Nov. 3, 2009
7612327 Optical encoder and electronic equipment having the same Nov. 3, 2009
7552873 Transmissive optical encoder Jun. 30, 2009
7550710 Scale and readhead apparatus Jun. 23, 2009
7550711 Encoder for a printer motor and a printer using the same Jun. 23, 2009
7511260 Encoder device for detecting movement Mar. 31, 2009
7485845 Photoelectric encoder capable of effectively removing harmonic components Feb. 3, 2009
7465917 Absolute encoder utilizing light of different wavelengths to reduce cross-talk Dec. 16, 2008
7449675 Photodetector array and codewheel configuration for flexible optical encoder resolution Nov. 11, 2008
7399956 Optical encoder with sinusoidal photodetector output signal Jul. 15, 2008
7400269 Coding element with integrated limit switch Jul. 15, 2008
7394062 Displacement-measuring optical scale and optical encoder using same Jul. 1, 2008
7391010 Photoelectric encoder and electronic equipment with increased resolution Jun. 24, 2008
7391011 Optical encoder capable of detecting absolute position Jun. 24, 2008
7382295 Control unit for electric power steering apparatus Jun. 3, 2008
7358481 Reflective encoder with three-dimensional code carrier Apr. 15, 2008

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