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Class Information
Number: 250/232
Name: Radiant energy > Photocells; circuits and apparatus > Optical or pre-photocell system > Light valve (e.g., iris diaphragm) > Light chopper type
Description: Subject matter having means for intermittently interrupting the optical path between the light source and photocell in a repetitious cyclic sequence.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7326918 |
Optical position sensor architecture for servo systems |
Feb. 5, 2008 |
| 7102832 |
Method and apparatus for modulating infrared radiation |
Sep. 5, 2006 |
| 6172358 |
Multifunction input module |
Jan. 9, 2001 |
| 6152443 |
Optical device for detecting the printing media in printers |
Nov. 28, 2000 |
| 6114690 |
Light-controlled safety switch for a punch press |
Sep. 5, 2000 |
| 5805056 |
Vehicle security system |
Sep. 8, 1998 |
| 5705811 |
System and apparatus for calibrating an image detector |
Jan. 6, 1998 |
| 5291261 |
Optical object detection system incorporating fiber optic coupling |
Mar. 1, 1994 |
| 5165078 |
Multi-channel, multi-wavelength detection system |
Nov. 17, 1992 |
| 4710619 |
Apparatus for generating a signal providing information regarding a radiating source, especially an infrared source |
Dec. 1, 1987 |
| 4706046 |
Resonator made of nonpiezoelectric material with high quality coefficient |
Nov. 10, 1987 |
| 4413179 |
Mechanical vibrator for light beam chopper |
Nov. 1, 1983 |
| 4301345 |
Key switch actuation by torsion spring |
Nov. 17, 1981 |
| 4202602 |
Multi-angular radiant energy modulator |
May. 13, 1980 |
| 4185274 |
High-speed electrooptical A/D converter |
Jan. 22, 1980 |
| 4045140 |
Means for near real time C-W laser source characterization |
Aug. 30, 1977 |
| 4028544 |
Radiant energy detection system |
Jun. 7, 1977 |
| 3993901 |
Radiation detecting system |
Nov. 23, 1976 |
| 3988683 |
Method and apparatus for generating a switching signal using odd and even harmonics and comparison of rectified harmonics to ratio potential |
Oct. 26, 1976 |
| 3985448 |
Angle or length measuring device |
Oct. 12, 1976 |
| 3956628 |
Light sensitive detection system |
May. 11, 1976 |
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