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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:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 7332709 |
Photoelectric encoder |
Feb. 19, 2008 |
| 7332711 |
Photoelectric encoder, scale therefor and method for manufacturing the same |
Feb. 19, 2008 |
| 7326919 |
Optical encoder |
Feb. 5, 2008 |
| 7301142 |
Optical encoder photodetector array with multiple resolutions |
Nov. 27, 2007 |
| 7297935 |
Position-measuring device |
Nov. 20, 2007 |
| 7265339 |
Encoder interpolation apparatus |
Sep. 4, 2007 |
| 7247839 |
Encoder for detecting position or displacement of moving body |
Jul. 24, 2007 |
| 7238932 |
Optical position sensing device |
Jul. 3, 2007 |
| 7199355 |
Methods and apparatuses for the exact determination of an angle of rotation |
Apr. 3, 2007 |
| 7193205 |
Optical encoder with burst generator for generating burst output signals |
Mar. 20, 2007 |
| 7187305 |
Encoder for a motor controller |
Mar. 6, 2007 |
| 7183535 |
Position-to-number electro-optical converter |
Feb. 27, 2007 |
| 7180430 |
Low-cost absolute linear optical encoder |
Feb. 20, 2007 |
| 7164120 |
Position measuring instrument |
Jan. 16, 2007 |
| 7164482 |
Position measuring system |
Jan. 16, 2007 |
| 7132647 |
Optical encoder |
Nov. 7, 2006 |
| 7126109 |
Encoder scale error compensation employing comparison among multiple detectors |
Oct. 24, 2006 |
| 7126696 |
Interferometric miniature grating encoder readhead using fiber optic receiver channels |
Oct. 24, 2006 |
| 7112782 |
Optical position measuring system |
Sep. 26, 2006 |
| 7105803 |
Rotary optical encoder |
Sep. 12, 2006 |
| 7098446 |
Photoelectric encoder |
Aug. 29, 2006 |
| 7095925 |
Optical phased array transmitter/receiver |
Aug. 22, 2006 |
| 7091475 |
Miniature 2-dimensional encoder readhead using fiber optic receiver channels |
Aug. 15, 2006 |
| 7084390 |
Position-measuring device including measuring graduation and scanning unit |
Aug. 1, 2006 |
| 7065966 |
Position control method by motor drive and control unit |
Jun. 27, 2006 |
| 7060969 |
Rotating machine having rotation sensors |
Jun. 13, 2006 |
| 7057163 |
Optical position sensing device |
Jun. 6, 2006 |
| 7053361 |
Projection encoder with moving side gratings and fixed side gratings |
May. 30, 2006 |
| 7053362 |
Absolute position miniature grating encoder readhead using fiber optic receiver channels |
May. 30, 2006 |
| 7045769 |
Optical encoders for position measurements |
May. 16, 2006 |
| 7034948 |
Displacement pickup |
Apr. 25, 2006 |
| 7034283 |
Absolute incremental position encoder and method |
Apr. 25, 2006 |
| 7019282 |
Optical encoder |
Mar. 28, 2006 |
| 7012703 |
Automatic encoder resolution calibration and length measurement system and method |
Mar. 14, 2006 |
| 6965437 |
Scanning unit for an optical position measuring device |
Nov. 15, 2005 |
| 6958469 |
Diffraction grating interference system encoder for detecting displacement information |
Oct. 25, 2005 |
| 6956200 |
Phase-shift photoelectric encoder |
Oct. 18, 2005 |
| 6946649 |
Rotary encoder and position adjuster therefor |
Sep. 20, 2005 |
| 6943341 |
Position measuring system |
Sep. 13, 2005 |
| 6906315 |
High accuracy miniature grating encoder readhead using fiber optic receiver channels |
Jun. 14, 2005 |
| 6906311 |
Photoelectric encoder |
Jun. 14, 2005 |
| 6900793 |
High resolution input detection |
May. 31, 2005 |
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