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Class Information
Number: 250/233
Name: Radiant energy > Photocells; circuits and apparatus > Optical or pre-photocell system > Light valve (e.g., iris diaphragm) > Light chopper type > Rotary
Description: Subject matter in which the means for intermittently interrupting the optical path is a rotary element.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8674288 Motor assembly sensor capture systems and methods Mar. 18, 2014
7958620 Method of producing a rotary encoder Jun. 14, 2011
7706508 X-ray flux management device Apr. 27, 2010
7358865 Optical encoder and apparatus using optical encoder Apr. 15, 2008
7277053 Apparatus and methods for detecting and locating signals Oct. 2, 2007
7161733 Remote sensing apparatus and a frequency analysis method of the remote sensing apparatus Jan. 9, 2007
7105801 Actuator with interrupter-type limit switches Sep. 12, 2006
7019667 System and method for accurate reading of rotating disk Mar. 28, 2006
6785635 Apparatus and method for predicting failures of spinning disks in turbo-machinery Aug. 31, 2004
6784807 System and method for accurate reading of rotating disk Aug. 31, 2004
6580064 Background rejection circuit Jun. 17, 2003
6525309 Optoelectronic sensor Feb. 25, 2003
6437324 Timing ruler or timing disk and process for its manufacture Aug. 20, 2002
6357695 Reticle for use in a guidance seeker for a spinning projectile Mar. 19, 2002
6184518 Rotary encoder with multiple calibration points Feb. 6, 2001
6111249 Submergible optical sensor housing with protective shutter and methods of operation and manufacture Aug. 29, 2000
6084235 Self aligning color wheel index signal Jul. 4, 2000
6034371 Semi-opaque chopper for thermal imaging system and method Mar. 7, 2000
5816079 Needle position detecting system for a circular knitting machine Oct. 6, 1998
5818049 Infrared gas spectrometer having a lid assembly with an integrated chopper and chopper motor Oct. 6, 1998
5777694 Color wheel with plastic film filters Jul. 7, 1998
5672865 Timing device for controlling machinery and other servomechanical devices and method of manufacture therefor Sep. 30, 1997
5557450 Optical rotation encoder for X-Y direction input device Sep. 17, 1996
5408311 Method for measuring a refracting power of an optical system and its apparatus Apr. 18, 1995
5315428 Optical scanning system comprising optical chopper May. 24, 1994
5255117 Advanced eye or sensor protection and high speed variable optical attenuation system Oct. 19, 1993
5245190 Imaging arrangement Sep. 14, 1993
5198939 Apparatus for positioning apertures of a disk assembly Mar. 30, 1993
5107530 X-ray diffractometer with shutter control Apr. 21, 1992
5055673 Radiation chopper having a chopper disk driven by an electromotor Oct. 8, 1991
5054913 Method and apparatus for measuring the velocity of a fluid using analysis of Young's fringes in speckle photography Oct. 8, 1991
5032023 Optical fiber based sensor for a variable depth range camera Jul. 16, 1991
5015056 Photointerruptor for use in light-transmission type rotary encoder May. 14, 1991
4999572 Redundant pulse monitoring in electric energy metering system Mar. 12, 1991
4999491 Optical seeker with rosette scanning Mar. 12, 1991
4987842 Detector for use on sewing machine Jan. 29, 1991
4988193 Method and apparatus for measuring incident light angle relative to level Jan. 29, 1991
4965447 Chopper for staring infrared systems Oct. 23, 1990
4959599 Head positioner Sep. 25, 1990
4938589 Sensor with integrated signal processing for one- to three-dimensional positioning Jul. 3, 1990
4930887 Apparatus and method for aligning ring resonator Jun. 5, 1990
4920905 Detector for use on sewing machines May. 1, 1990
4909600 Light chopper assembly Mar. 20, 1990
4873433 Electromagnetic radiation detecting device with hollow semicylindrical chopper Oct. 10, 1989
4848867 Rotary joint for polarization plane maintaining optical fibers Jul. 18, 1989
4814602 Photoelectric conversion processing apparatus Mar. 21, 1989
4731638 Timing pulse generator for an electrophotographic printing machine Mar. 15, 1988
4716289 Obturator disc for an optical transducer Dec. 29, 1987
4700482 Self-supporting graduation carrier Oct. 20, 1987
4684857 Optical excitation electromagnetic motor Aug. 4, 1987

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