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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 |
| 6232594 |
Feedback control system using optical incremental position encoder with dual sinusoidal intensity patterns |
May. 15, 2001 |
| 6222181 |
Position measuring instrument measuring relative turning angle of light sources for receiving devices |
Apr. 24, 2001 |
| 6194708 |
Focus-type encode device |
Feb. 27, 2001 |
| 6191415 |
Position transducer |
Feb. 20, 2001 |
| 6100519 |
Photo-detector based calculating means having a grating wheel with integrated lenses |
Aug. 8, 2000 |
| 6087654 |
Encoder apparatus and methods |
Jul. 11, 2000 |
| 6084234 |
Position transducer |
Jul. 4, 2000 |
| 6080983 |
Synchronous detection system for multichannel infrared spectroscopy |
Jun. 27, 2000 |
| 6049087 |
Method for detecting origin point of position sensor |
Apr. 11, 2000 |
| 6049075 |
Method for detecting origin point of position sensor |
Apr. 11, 2000 |
| 6031223 |
Rotary encoder having a sensor activation controller |
Feb. 29, 2000 |
| 6031222 |
Optical rotary encoder having two half-parts of a lateral surface of a rotating disk |
Feb. 29, 2000 |
| 5981941 |
Optical encorder for detection having a moving reference point |
Nov. 9, 1999 |
| 5981942 |
Optical encoder for detecting relative displacement based on signals having predetermined phase differences |
Nov. 9, 1999 |
| 5973673 |
Cursor control device |
Oct. 26, 1999 |
| 5959295 |
Timing device and method for positioning non-linear machine parts |
Sep. 28, 1999 |
| 5955728 |
Method for detecting origin point of position sensor |
Sep. 21, 1999 |
| 5949067 |
Code plate of optical rotary encoder having tilted light-detection patterns |
Sep. 7, 1999 |
| 5949066 |
System and method for creating and utilizing a sinusoidal based pattern sensor to achieve precise positioning of a movable element |
Sep. 7, 1999 |
| 5939714 |
Tracking error detector employing phase difference detection method |
Aug. 17, 1999 |
| 5936236 |
Method for generating a synthetic reference signal for comparison with scanning signals of a position measuring device |
Aug. 10, 1999 |
| 5907152 |
Pointing device utilizing a photodetector array |
May. 25, 1999 |
| 5889280 |
Apparatus for measuring displacement |
Mar. 30, 1999 |
| 5883384 |
Rotational displacement information detection apparatus |
Mar. 16, 1999 |
| 5874729 |
Device for filtering odd-numbered harmonic signal components |
Feb. 23, 1999 |
| 5868296 |
Electronically controlled high speed press feed capable of being driven in synchronization with a press |
Feb. 9, 1999 |
| 5837999 |
Position detecting device having a line sensor whose length is shorter than a distance between two light beams simultaneously generated by an encoding member |
Nov. 17, 1998 |
| 5821531 |
Dual sensor encoder for detecting forward/reverse rotation having light modulating patterns with a predetermined phase different |
Oct. 13, 1998 |
| 5814812 |
Device for filtering of harmonic signal components |
Sep. 29, 1998 |
| 5786593 |
Rotary encoder having a plurality of patterns with different cycles |
Jul. 28, 1998 |
| 5763874 |
Incremental optical encoder having partially opaqued quadrature detectors |
Jun. 9, 1998 |
| 5750984 |
Optical encoder used for position detection based upon a plurality of signals |
May. 12, 1998 |
| 5726445 |
Device for obtaining harmonic-free signals |
Mar. 10, 1998 |
| 5723858 |
Position encoder with fault indicator |
Mar. 3, 1998 |
| 5712478 |
Apparatus for measuring position of ball joint |
Jan. 27, 1998 |
| 5708496 |
Modular optical shaft encoder having a slide gap centering mechanism and method of use |
Jan. 13, 1998 |
| 5701525 |
Camera encoder assembly, system and method thereof |
Dec. 23, 1997 |
| 5698851 |
Device and method for precise angular measurement by mapping small rotations into large phase shifts |
Dec. 16, 1997 |
| 5698849 |
Optical encoder with alignment of source, detector, and modulator |
Dec. 16, 1997 |
| 5670779 |
Electro-optical shaft angle transducer having a rotatable refractive optical element |
Sep. 23, 1997 |
| 5670781 |
Photoelectrical encoder |
Sep. 23, 1997 |
| 5665965 |
Encoder apparatus and methods employing optical and graphical programming |
Sep. 9, 1997 |
| 5661296 |
Rotary encoder measuring substantially coinciding phases of interference light components |
Aug. 26, 1997 |
| 5644127 |
Rotary encoder and input device using the same |
Jul. 1, 1997 |
| 5640377 |
Rotation information detecting apparatus and method |
Jun. 17, 1997 |
| 5637868 |
Fixed point detecting device using detection of light diffracted by holographic diffraction gratings |
Jun. 10, 1997 |
| 5604345 |
Optical encoder having a combination of a uniform grating and a non-uniform grating |
Feb. 18, 1997 |
| 5602388 |
Absolute and directional encoder using optical disk |
Feb. 11, 1997 |
| 5596188 |
Clock recovery system and rotational detection circuit |
Jan. 21, 1997 |
| 5596189 |
Measuring system for determining transverse deflection of a rotary shaft |
Jan. 21, 1997 |
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