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Class Information
Number: 250/231.14
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
Description: Subject matter wherein photocell means is provided to incrementally sense the angular position or speed of a rotatable shaft as the active external physical quantity and for generating an output proportional to the number of increments sensed by the photocell(s).
Sub-classes under this class:
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 |
| 7449677 |
Optical encoder |
Nov. 11, 2008 |
| 7446305 |
Angle-measuring instrument having a spacer for positioning a cap relative to a printed circuit board |
Nov. 4, 2008 |
| 7446306 |
Photoelectric encoder having multiple light-receiving elements |
Nov. 4, 2008 |
| 7443518 |
Measuring instrument, in particular for transmission measurement in vacuum system |
Oct. 28, 2008 |
| 7435946 |
Mark detector using multiple light beams for use in a displacement detector and an image forming apparatus |
Oct. 14, 2008 |
| 7423257 |
Signal transmission device and method for transfer of signals between two elements moving relative to one another using an optically-readable strip conductor |
Sep. 9, 2008 |
| 7405393 |
Position encoder |
Jul. 29, 2008 |
| 7402793 |
System and method for controlling and energizing a rotating object |
Jul. 22, 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 |
| 7391009 |
Angle-measuring system having irregular reference mark that is dedicated without time delay |
Jun. 24, 2008 |
| 7391011 |
Optical encoder capable of detecting absolute position |
Jun. 24, 2008 |
| 7385178 |
Reflective encoders with various emitter-detector configurations |
Jun. 10, 2008 |
| 7385179 |
Optical encoder for measuring displacement |
Jun. 10, 2008 |
| 7378643 |
Optical projection encoder with patterned mask |
May. 27, 2008 |
| 7377435 |
Optical encoder |
May. 27, 2008 |
| 7372625 |
Device for retaining optical components |
May. 13, 2008 |
| 7368705 |
Absolute encoder employing linked sub-encoders and beat track |
May. 6, 2008 |
| 7358479 |
Method and computed tomography gantry for measurement of rotation angle of rotor |
Apr. 15, 2008 |
| 7358865 |
Optical encoder and apparatus using optical encoder |
Apr. 15, 2008 |
| 7355165 |
Optical encoder and method for using same |
Apr. 8, 2008 |
| 7348543 |
Optical encoder with hollow light guide for indicating the angular position of a rotary shaft |
Mar. 25, 2008 |
| 7348546 |
Position measuring system with a scanning unit having a reference pulse signal detection unit |
Mar. 25, 2008 |
| 7332709 |
Photoelectric encoder |
Feb. 19, 2008 |
| 7326919 |
Optical encoder |
Feb. 5, 2008 |
| 7309855 |
Reflective encoder with light shield and electronic device using such reflective encoder |
Dec. 18, 2007 |
| 7304295 |
Method and system of detecting eccentricity and up/down movement of a code wheel of an optical encoder set |
Dec. 4, 2007 |
| 7304294 |
Reflective encoder with reduced background noise |
Dec. 4, 2007 |
| 7301141 |
Photoelectric encoder and electric device provided with the same |
Nov. 27, 2007 |
| 7301142 |
Optical encoder photodetector array with multiple resolutions |
Nov. 27, 2007 |
| 7297935 |
Position-measuring device |
Nov. 20, 2007 |
| 7280049 |
Encoder runout error correction circuit |
Oct. 9, 2007 |
| 7276687 |
Optical encoder and electronic equipment using the same |
Oct. 2, 2007 |
| 7265338 |
Photoelectric encoder using an incoherent semiconductor light source |
Sep. 4, 2007 |
| 7230230 |
Apparatus for adjusting a signal and prohibiting adjustment of the signal based on a position of a movable member |
Jun. 12, 2007 |
| 7214928 |
Scanning unit for an optical position measuring device |
May. 8, 2007 |
| 7202468 |
Power transfer device with contactless optical encoder and color reflective surface |
Apr. 10, 2007 |
| 7199356 |
Absolute angle detecting device |
Apr. 3, 2007 |
| 7196319 |
Position-measuring device |
Mar. 27, 2007 |
| 7196320 |
Fiber optic encoder for position sensing |
Mar. 27, 2007 |
| 7193204 |
Multi-track optical encoder employing beam divider |
Mar. 20, 2007 |
| 7183538 |
Apparatus for adjusting a signal based on a position of a movable member |
Feb. 27, 2007 |
| 7182258 |
Enhanced reflective optical encoder |
Feb. 27, 2007 |
| 7166833 |
Fiber optic remote reading encoder |
Jan. 23, 2007 |
| 7164120 |
Position measuring instrument |
Jan. 16, 2007 |
| 7164482 |
Position measuring system |
Jan. 16, 2007 |
| 7161139 |
Position-measuring system and method for operating a position-measuring system |
Jan. 9, 2007 |
| 7154609 |
Interferential position measuring arrangement |
Dec. 26, 2006 |
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