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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
4866687 Optical disc access method and optical disk storage using coarse and fine actuators Sep. 12, 1989
4864118 Optical scanning unit with tracking error detection Sep. 5, 1989
4855981 Method and device for reading out optically recorded data and compensating for a drastic change in the position of a line to be read Aug. 8, 1989
4811061 Polychromatic mutual alignment device for an aiming apparatus Mar. 7, 1989
4807211 Apparatus for inscribing and/or reading a record carrier Feb. 21, 1989
4805163 Tracking control unit in information reproducing apparatus Feb. 14, 1989
4803677 Rotary recording medium having a guide track and recording and reproducing apparatus therefor Feb. 7, 1989
4787075 Optical information recording medium and apparatus for recording/reproducing information using the same Nov. 22, 1988
4783590 Error signal producing device having improved linearity Nov. 8, 1988
4782474 Tracking servo system for controllably projecting an optical beam on an optical disk Nov. 1, 1988
4776579 Automatic guidance device for deformable sheet material Oct. 11, 1988
4773053 Optical system for guiding the read beam in a magneto-optical storage Sep. 20, 1988
4773055 Videodisc focusing and tracking servo Sep. 20, 1988
4764669 Photoelectric apparatus for tracing a scanning head along a pattern track with selectable sampling Aug. 16, 1988
RE32709 Tracking system for video disc player Jul. 5, 1988
4754129 Grating adjustment apparatus of 3-beam type optical pick-up Jun. 28, 1988
4744070 Optical disk and method of tracking the same May. 10, 1988
4740940 Optical information read apparatus Apr. 26, 1988
4734572 Dual light source locating and tracking system Mar. 29, 1988
4730295 Apparatus for reading and/or recording a trackwise arranged optical information structure Mar. 8, 1988
4724533 Optical head Feb. 9, 1988
4720629 Pattern tracer with electronic kerf control with adjustably delayed sampling pulse Jan. 19, 1988
4718052 Head assembly for optical disc Jan. 5, 1988
4705958 Apparatus for reading an arbitrarily oriented image Nov. 10, 1987
4703820 Vehicle guidance means Nov. 3, 1987
4703467 Video disc read back scanner Oct. 27, 1987
4703240 System for guiding a driverless vehicle Oct. 27, 1987
4701050 Semiconductor exposure apparatus and alignment method therefor Oct. 20, 1987
4700336 Optical recording and playback apparatus using plural light spots Oct. 13, 1987
4698795 Tracking servo device Oct. 6, 1987
4695991 Reading information stored in multiple frame format Sep. 22, 1987
4694639 Robotic lawn mower Sep. 22, 1987
4694153 Linear array optical edge sensor Sep. 15, 1987
4694443 Optical system for tracking an information recording medium Sep. 15, 1987
4692913 Method and apparatus for reading a data record carrier Sep. 8, 1987
4686662 Subaperture coarse tracking optical system for optical data storage devices Aug. 11, 1987
4674076 Optical memory system having improved positioning and focusing control circuitry Jun. 16, 1987
4672190 Line following system and process with matrix generating Jun. 9, 1987
4672557 Automatic accurate alignment system Jun. 9, 1987
4668089 Exposure apparatus and method of aligning exposure mask with workpiece May. 26, 1987
4667316 Information recording-reproducing apparatus May. 19, 1987
4663749 Apparatus for reproducing information from an optically readable record carrier May. 5, 1987
4661944 Optical recording/playback apparatus having a focusing control system with reduced spot-offset sensitivity Apr. 28, 1987
4659918 Pattern tracer with dual scan slowdown circuit Apr. 21, 1987
4658127 Pattern tracer with kerf dependent control for improved cornering Apr. 14, 1987
4658389 Track follower system for correcting tangent errors in an optical record scanning system Apr. 14, 1987
4652738 Edge detecting device in optical measuring instrument Mar. 24, 1987
4652765 Edge detecting device in optical measuring instrument Mar. 24, 1987
4650316 Method for detecting image information Mar. 17, 1987
4647760 Pattern tracer with electronic kerf, calibration and line width compensation Mar. 3, 1987

1 2 3 4 5 6

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