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Class Information
Number: 250/570
Name: Radiant energy > Photocells; circuits and apparatus > Optical or pre-photocell system > Including coded record > Digital information > Tape, drum, or disc types
Description: Subject matter wherein the record is in the shape of a narrow strip of flexible material a cylinder, or a flat circular form.

Patents under this class:
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Patent Number Title Of Patent Date Issued
7417235 Particle detector for secondary ions and direct and or indirect secondary electrons Aug. 26, 2008
6946634 Optical pickup device Sep. 20, 2005
5682039 Media position sensing system having a plurality of apertures in the media edge margin Oct. 28, 1997
5352900 Ribbon tracking technique with low-ribbon detection Oct. 4, 1994
5294805 Method and apparatus for analyzing tracking error in magnetic tapes Mar. 15, 1994
5272352 Retrieval system Dec. 21, 1993
5245199 Mark detecting apparatus using active threshold comparison Sep. 14, 1993
5243196 Film image registration system with image filing and illumination control Sep. 7, 1993
5229620 System for integrated tape hole detection by detecting an edge of the tape and/or a pattern on the tape Jul. 20, 1993
5212388 Method for detecting tracking error in magnetic tapes with using an X-Y stage calibration means May. 18, 1993
5178063 Method and apparatus for automatic numbering of forms on a rotary printing press Jan. 12, 1993
5137347 Information retrieval apparatus Aug. 11, 1992
5130555 Tape crease inspecting method and apparatus having a stripe shaped pattern reflection plate Jul. 14, 1992
5086231 Microfilm retrieval system for retrieving a designated image frame Feb. 4, 1992
5015056 Photointerruptor for use in light-transmission type rotary encoder May. 14, 1991
4971414 Optical information record/read apparatus Nov. 20, 1990
4953933 Optical encoder reading device Sep. 4, 1990
4947050 Sensor bracket for magnetic tape cartridge drive Aug. 7, 1990
4939591 Contact-type image sensor Jul. 3, 1990
4906854 Processing method and apparatus for exposed and developed film with position sensing Mar. 6, 1990
4897540 Apparatus for detecting the presence or absence of overlap at tape joints Jan. 30, 1990
4870291 Splice inspection method and apparatus using light inclined at a prescribed angle Sep. 26, 1989
4864149 Method of detecting frame edge Sep. 5, 1989
4864122 Joint inspection apparatus for determining the size of a gap Sep. 5, 1989
4855987 Optical device comprising a holder accommodating an optical system which compensates for thermal expansion/contraction Aug. 8, 1989
4814589 Information transfer and use, particularly with respect to objects such as gambling chips Mar. 21, 1989
4743774 Method and apparatus for optical detection of information May. 10, 1988
4705958 Apparatus for reading an arbitrarily oriented image Nov. 10, 1987
4695991 Reading information stored in multiple frame format Sep. 22, 1987
4691112 Apparatus for the detection of optical marks on a film support moved relative to the apparatus Sep. 1, 1987
4687321 Mark detection apparatus for a micro-roll film Aug. 18, 1987
4687943 Optical motion picture film inspection system Aug. 18, 1987
4673815 Method of automatically detecting the locations of the frame lines of a reversal film and apparatus for carrying out the method Jun. 16, 1987
4665318 Recording medium mark detector May. 12, 1987
4652124 Film inspection system Mar. 24, 1987
4652125 Film inspection system Mar. 24, 1987
4612446 Web terminal detecting device Sep. 16, 1986
4611907 Method of judging film frame position Sep. 16, 1986
4607950 Mark detection apparatus for a micro-roll film Aug. 26, 1986
4570075 Optical end-of-tape detection device Feb. 11, 1986
4514641 Apparatus for retrieving information Apr. 30, 1985
4475179 Optical disc write/read methods and apparatus with improved focus and tracking control Oct. 2, 1984
4460977 Optical memory playback apparatus Jul. 17, 1984
4457008 Automatic retrieval apparatus Jun. 26, 1984
4453823 Method of stopping a film Jun. 12, 1984
4401394 Universal end of ribbon sensing system Aug. 30, 1983
4342996 Two disc encoder system for monitoring height of liquid in storage tank Aug. 3, 1982
4297585 System for the detection of splicing defects in film Oct. 27, 1981
4296332 Sprocket hole sensing detector for moving translucent paper sheets Oct. 20, 1981
4240066 Cylindrical encoder for use with fiber optics Dec. 16, 1980

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