JPS5478128A - Information retrieval apparatus - Google Patents

Information retrieval apparatus

Info

Publication number
JPS5478128A
JPS5478128A JP1960375A JP1960375A JPS5478128A JP S5478128 A JPS5478128 A JP S5478128A JP 1960375 A JP1960375 A JP 1960375A JP 1960375 A JP1960375 A JP 1960375A JP S5478128 A JPS5478128 A JP S5478128A
Authority
JP
Japan
Prior art keywords
circuit
film
output
recording medium
marks
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1960375A
Other languages
Japanese (ja)
Inventor
Mutsukimi Inoue
Shunzo Inoue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP1960375A priority Critical patent/JPS5478128A/en
Publication of JPS5478128A publication Critical patent/JPS5478128A/en
Pending legal-status Critical Current

Links

Landscapes

  • Projection-Type Copiers In General (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Abstract

PURPOSE: To enable marks to be read stably by detecting the marks on a recording medium with two photo detectors, taking the difference of the output signals thereof and drawing out either of the positive component and negative component of the signal of the difference according to the transfer direction of the recording medium.
CONSTITUTION: The marks having been provided on a recording medium such as film, etc. are read with two photo detectors 1, 2 and the differential voltage of both signals is obtained with a differential amplifier 11 by way of detection circuits 10, 10 respectively. A changeover cicuit 21' selectively applies the output of the amplifier 11 to a clipper circuit 23 through an inverter 22' or directly depending upon the positive or negative of the comparator 16. The output signals of the circuit 23 are counted as mark signals in a addition-subtraction counter circuit 15. A keyboard 17 generates the signal corresponding to the frame number to be retrieved of the film having been set with keys. The difference between this number and the output signal of the circuit 15 is detected with the comparator and the feed direction of the film is discriminated. The output thereof is applied to the circuit 21' to be used for selection and is let to revolve a motor 20 by way of a D-A converting part 18 and forward-backward changeover part 19, whereby a film feed roller 4 is revolved in the specified directon.
COPYRIGHT: (C)1979,JPO&Japio
JP1960375A 1975-02-17 1975-02-17 Information retrieval apparatus Pending JPS5478128A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1960375A JPS5478128A (en) 1975-02-17 1975-02-17 Information retrieval apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1960375A JPS5478128A (en) 1975-02-17 1975-02-17 Information retrieval apparatus

Publications (1)

Publication Number Publication Date
JPS5478128A true JPS5478128A (en) 1979-06-22

Family

ID=12003771

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1960375A Pending JPS5478128A (en) 1975-02-17 1975-02-17 Information retrieval apparatus

Country Status (1)

Country Link
JP (1) JPS5478128A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4947175A (en) * 1972-09-26 1974-05-07

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4947175A (en) * 1972-09-26 1974-05-07

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