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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:

Class Number Class Name Patents
250/231.14 Incremental shaft readers; i.e., with means to generate increments of angular shaft rotation 546

Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Patent Number Title Of Patent Date Issued
8712646 Device for determining the absolute angular position of the steering wheel of an electric power-assisted steering column of a motor vehicle using weighted dynamic parameters of the vehicle Apr. 29, 2014
8710425 Encoder that optically detects positional information of a moving body from different optical paths lengths Apr. 29, 2014
8704157 Optical rotary encoder and manufacturing method thereof Apr. 22, 2014
8674287 Encoder, optical module and servo system including plural light receiving elements having respective shapes with respect to a point light source Mar. 18, 2014
8659448 Movement detection device Feb. 25, 2014
8658964 Photoelectric encoder with optical grating Feb. 25, 2014
8658965 Encoder having a pattern track including different-width patterns Feb. 25, 2014
8637805 Optical encoder using off-axis imaging through a lens Jan. 28, 2014
8610050 Optical displacement detection apparatus Dec. 17, 2013
8604413 Optical encoder including displacement sensing normal to the encoder scale grating surface Dec. 10, 2013
8605272 Tool, tool set and method of setting the pitch of the blades of a model propeller Dec. 10, 2013
8598509 Optical encoder Dec. 3, 2013
8552361 Optical displacement sensor for infusion devices Oct. 8, 2013
8552362 System and method for linear and angular measurements of a moving object Oct. 8, 2013
8546746 Photoelectric encoder and photoelectric encoder system Oct. 1, 2013
8546745 Optoelectronic position measurement device having a guided beam path in the interior of a code carrier and optoelectronic position measurement method Oct. 1, 2013
8546744 Rotary encoder, rotary motor, rotary motor system, disk, and method of manufacturing rotary encoder Oct. 1, 2013
8546743 Encoder in which the relative displacement between the encoder scale and encoder head is detected Oct. 1, 2013
8525101 Position transmitter having a normal mode and a power saving mode operation for the acquisition of the position of a rotatable shaft Sep. 3, 2013
8525102 Optical encoding system and optical encoder having an array of incremental photodiodes and an index photodiode for use in an optical encoding system Sep. 3, 2013
8507841 Optical element and method for producing the same Aug. 13, 2013
8497468 Encoder having an overmolded cover, encoder system with an encoder having an overmolded cover, and method for manufacturing an encoder having an overmolded cover Jul. 30, 2013
8492703 Lens aberration correction in a doubly telecentric displacement sensor Jul. 23, 2013
8488131 Scale, displacement detection apparatus provided with the same, and imaging apparatus provided with the same Jul. 16, 2013
8481915 Optical encoder Jul. 9, 2013
8481914 Optical encoder including a plurality of encoder heads and common wiring lines Jul. 9, 2013
8476577 Optical encoder Jul. 2, 2013
8476578 Rotary encoder and rotation mechanism including the same Jul. 2, 2013
8476580 Angle-measuring device and line of products with such angle-measuring devices Jul. 2, 2013
8471194 Rotary encoder for diagnosing problems with rotary equipment Jun. 25, 2013
8471554 Encoder module with an alignment system Jun. 25, 2013
8461514 Optical spectrum modulated position sensor having a controller with at least one fiber optic line Jun. 11, 2013
8461515 Method and device for determining positions having at least one sensor array reading twice and with opposite read-out directions Jun. 11, 2013
8445835 Encoder, servo unit and encoder manufacturing method May. 21, 2013
8436293 Optical encoder and method for measuring displacement information using multiple optical tracks of diffractive optical regions having different periodicities May. 7, 2013
8415610 Optical encoder having a single signal track and an optical detecting part with sine and cosine signals Apr. 9, 2013
8399825 Sensor and method for determining an angular position of a rotor Mar. 19, 2013
8395110 Encoder apparatus using liquid to suppress detection failure Mar. 12, 2013
8395111 Optical system and method for detecting rotation of an object Mar. 12, 2013
8395535 Photoelectric encoder Mar. 12, 2013
8384014 Interpolation method and device for increasing the resolution of encoders Feb. 26, 2013
8380463 Apparatus having a modularly constructed, measuring transducer circuit Feb. 19, 2013
8373110 System and method for linear and angular measurements of a moving object Feb. 12, 2013
8368004 Reflection plate for optical encoder and manufacturing method thereof, and optical encoder Feb. 5, 2013
8368005 Optical detection method and optical MEMS detector, and method for making MEMS detector Feb. 5, 2013
8357891 Speed detection device, image forming device, and computer readable storage medium storing speed detection program Jan. 22, 2013
8354815 Linear encoder, linear motor system, and method of manufacturing linear encoder Jan. 15, 2013
8356132 Position sensing system for a KVM switch Jan. 15, 2013
8330097 Angular correction method for rotary encoder Dec. 11, 2012
8330098 High resolution, high speed, miniaturized optical encoder Dec. 11, 2012

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

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