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Class Information
Number: 250/231.13
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
Description: Subject matter wherein the angular position or speed or a rotatable shaft is the active external physical quantity sensed by one or more photocells and an output is generated which is indicative of those parameters.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5227625 |
Retro-reflective variable-pitch diffraction grating for use in a rotary actuator disk file |
Jul. 13, 1993 |
| 5220162 |
Disk for revolution sensor having at least three engaging portions |
Jun. 15, 1993 |
| 5220161 |
Position-sensing and motion verification assembly for a motor-driven mechanism |
Jun. 15, 1993 |
| 5218199 |
Optical position sensor having rigidly fixed read head |
Jun. 8, 1993 |
| 5214278 |
Apparatus for monitoring speed and lateral position of a rotating shaft having reflective surfaces |
May. 25, 1993 |
| 5211539 |
Apparatus for indicating the pitch of turbofan blades |
May. 18, 1993 |
| 5210409 |
Apparatus and method for sensing the relative position of two members employing a variable wavelength source and wavelength dependant scanner |
May. 11, 1993 |
| 5198763 |
Apparatus for monitoring the axial and radial wear on a bearing of a rotary shaft |
Mar. 30, 1993 |
| 5194730 |
Mobile electronic lineal measurement device with switchable magnetic mount |
Mar. 16, 1993 |
| 5171983 |
Relative position transducer for oscillating and scanning a read head over a coded track region |
Dec. 15, 1992 |
| 5171982 |
Display device with photoelectric sensing of unevenly spaced marks on a coding disk |
Dec. 15, 1992 |
| 5170051 |
Elastic gripping optoelectronic sensor for an energy consumption meter |
Dec. 8, 1992 |
| 5157460 |
Method and apparatus for measuring rotary speed using polarized light |
Oct. 20, 1992 |
| 5155401 |
Recorder motor with attached encoder and cover |
Oct. 13, 1992 |
| 5150103 |
Fixture containing compact rotational positioning sensor |
Sep. 22, 1992 |
| 5136158 |
Angular displacement detecting device for floating body with integral magnetic path forming means |
Aug. 4, 1992 |
| 5136159 |
Angular displacement detecting device for floating body with integral magnetic path forming means |
Aug. 4, 1992 |
| 5132531 |
Translational position sensing apparatus employing rotating element and PSD |
Jul. 21, 1992 |
| 5132527 |
Compensation arrangement for opto-electronic reference generator |
Jul. 21, 1992 |
| 5127738 |
Method and apparatus for measuring alignment status |
Jul. 7, 1992 |
| 5128536 |
Abnormality processing circuit for an encoder |
Jul. 7, 1992 |
| 5126561 |
Angle displacement detector for optical image stabilization device |
Jun. 30, 1992 |
| 5126560 |
Graduation carrier of plastics material with a graduation structure and fresnel zone ring |
Jun. 30, 1992 |
| 5127035 |
Pulse counter circuit and displacement measuring device |
Jun. 30, 1992 |
| 5120706 |
Drive system employing frictionless bearings including superconducting matter |
Jun. 9, 1992 |
| 5117104 |
Angular displacement detecting device utilizing a tubular casing having a chamber wherein a fluoroliquid is sealed |
May. 26, 1992 |
| 5103089 |
Angular displacement detecting device |
Apr. 7, 1992 |
| 5103090 |
Optical angle measuring method and apparatus particularly for machine tools using polygons with light reflecting facets |
Apr. 7, 1992 |
| 5089771 |
Reading device for a watt-hour meter |
Feb. 18, 1992 |
| 5089698 |
Interferometric optical system for measuring linear or angular displacements by beat signals |
Feb. 18, 1992 |
| 5087811 |
Optical train for measuring angle or position with transmission by intrinsically linear and referenced optical fibers using one or more light sources |
Feb. 11, 1992 |
| 5086221 |
Rotary encoder having stationary central support shaft |
Feb. 4, 1992 |
| 5074660 |
Method and apparatus for measuring rotating movements |
Dec. 24, 1991 |
| 5070238 |
Rotary encoder having circular magnet |
Dec. 3, 1991 |
| 5068528 |
Encoded surface position sensor with multiple wavelengths and reference beam |
Nov. 26, 1991 |
| 5063382 |
Construction for mounting a cap to a magnetic type rotary encoder |
Nov. 5, 1991 |
| 5061679 |
Drive system employing frictionless bearings including superconducting matter |
Oct. 29, 1991 |
| 5059901 |
Visible light laser tachometer for sensing rotational speed of an object |
Oct. 22, 1991 |
| 5058822 |
Takeup reel positioning apparatus for tape threading in a tape drive system |
Oct. 22, 1991 |
| 5057684 |
Unitary aligning and gapping apparatus for modular optical shaft encoder |
Oct. 15, 1991 |
| 5047629 |
Position and motion detector with magnetic coupling and optical detection |
Sep. 10, 1991 |
| 5042157 |
Fiber optic angular orientation sensor digital serial encoding |
Aug. 27, 1991 |
| 5038243 |
Local initialization for incremental encoder |
Aug. 6, 1991 |
| 5021648 |
Motion tranducing through conversion of linear motion to circular motion |
Jun. 4, 1991 |
| 5015836 |
Source intensity adjustment apparatus for optical channel |
May. 14, 1991 |
| 5006703 |
Reflective optical rotary encoder disc |
Apr. 9, 1991 |
| 4993659 |
Tape twine detecting device |
Feb. 19, 1991 |
| 4990909 |
Revolution counter using a magnetic bubble device for multi-turn absolute encoder |
Feb. 5, 1991 |
| 4988945 |
Optical and magnetic encoder for serially transmitting absolute position signals with an auxiliary power supply |
Jan. 29, 1991 |
| 4978846 |
Angular position measurement apparatus |
Dec. 18, 1990 |
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