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Class Information
Number: 250/202
Name: Radiant energy > Photocells; circuits and apparatus > Photocell controls its own optical systems > Following a pattern (e.g., line or edge)
Description: Subject matter having means for illuminating the photocell in accordance with the relative position of the photocell and a pattern, and having means for causing the photocell to follow the edge of the pattern under control of said illumination, or for causing the optical path between pattern and photocell to change, under the control of said illumination, so that the photocell follows the edge of the pattern image.










Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
4215694 Laser therapy apparatus Aug. 5, 1980
4211921 Sensor for use in controlling operation of mobile farming machine Jul. 8, 1980
4207462 Line-trace read-out method and device for the servo-control of machine tools Jun. 10, 1980
4198657 Optical disk reader with means for correcting errors due to eccentricity and time axis variations Apr. 15, 1980
4198164 Proximity sensor and method and apparatus for continuously measuring rail gauge Apr. 15, 1980
4197453 Optical pattern tracer Apr. 8, 1980
4193087 System for automatically digitizing engineering drawings Mar. 11, 1980
4169227 System for detecting the tracking error in optical readers and recorders Sep. 25, 1979
4164659 Method of monitoring the phase state of material in processes involving crystallization from melt and apparatus for performing same Aug. 14, 1979
4160199 Line or pattern following system Jul. 3, 1979
4160158 Optical tracer back-up circuit Jul. 3, 1979
4158768 Bi-axial scanning device for following the outline of a template Jun. 19, 1979
4152587 Reader for graph curve lines and like May. 1, 1979
4151451 Graphic input controlled automatic positioning system Apr. 24, 1979
4147930 Object location detector Apr. 3, 1979
4143264 Highway line detector Mar. 6, 1979
4142098 Optical readout for reflective video discs Feb. 27, 1979
4135206 Objective mount for video disc player Jan. 16, 1979
4135083 Optical scanning device Jan. 16, 1979
4133404 Automatic lawn mower Jan. 9, 1979
4128481 Curve following device Dec. 5, 1978
4128297 Variable lead optical tracing machine with scanning and vari-focal lens Dec. 5, 1978
4121096 System for automatic control of object by contrast program Oct. 17, 1978
4121097 Photoelectrically controlled line follower apparatus Oct. 17, 1978
4117324 Curve follower device Sep. 26, 1978
4114034 Optical cursor tracking correction system Sep. 12, 1978
4100405 Photo-electric scanner for line following devices Jul. 11, 1978
4090794 Optical cigarette end inspection device May. 23, 1978
4088890 Optical position detector May. 9, 1978
4084087 Analog apparatus for determining the attitude errors of a three-axis stabilized satellite Apr. 11, 1978
4081671 Photoelectric line follower Mar. 28, 1978
4077488 Guidance assist system for agricultural machines Mar. 7, 1978
4072301 Tracing head and drive Feb. 7, 1978
4067044 Information recording and retrieval apparatus Jan. 3, 1978
4063287 Tracking mirror device for a video disc player Dec. 13, 1977
4059841 Optical read-out system including asymetrical beam intensity and four detector cells Nov. 22, 1977
4059787 Method for the automatic location of particular zones of a surface and an installation for the application of said method Nov. 22, 1977
4053734 Curve reading method and apparatus Oct. 11, 1977
4049961 Automatic guidance system for moving objects Sep. 20, 1977
4049962 Line edge follower Sep. 20, 1977
4044378 Optical system for reflective mode video playback apparatus Aug. 23, 1977
4037252 Apparatus for reading a disc-shaped record carrier with plural scanning spots for stable radial tracking Jul. 19, 1977
4034403 Apparatus for positional control of a reading head in a device for reproducing optically coded video disk recordings Jul. 5, 1977
4025025 Apparatus for scanning a marked web May. 24, 1977
4020339 System for determining the deviation of an object from a sight line Apr. 26, 1977
4019173 System for recognition of shape patterns Apr. 19, 1977
4013884 Optical device for a surface vehicle guidance system using a light-contrast programme Mar. 22, 1977
4003445 Code circuitry for a vehicle guidance mechanism Jan. 18, 1977
4002900 Phototracing system Jan. 11, 1977
4000417 Scanning microscope system with automatic cell find and autofocus Dec. 28, 1976

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