JPS5748162A - Mark density measuring circuit - Google Patents

Mark density measuring circuit

Info

Publication number
JPS5748162A
JPS5748162A JP12272980A JP12272980A JPS5748162A JP S5748162 A JPS5748162 A JP S5748162A JP 12272980 A JP12272980 A JP 12272980A JP 12272980 A JP12272980 A JP 12272980A JP S5748162 A JPS5748162 A JP S5748162A
Authority
JP
Japan
Prior art keywords
output
differential amplifier
density
amplifier
mark
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
JP12272980A
Other languages
Japanese (ja)
Inventor
Haruo Igawa
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP12272980A priority Critical patent/JPS5748162A/en
Publication of JPS5748162A publication Critical patent/JPS5748162A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10851—Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)

Abstract

PURPOSE:To measure the density of a mark recorded on a medium, by providing a differential amplifier for outputting a difference between an output of an integral network and an output of a photodetector, and a comparison circuit for comparing an output of the differential amplifier with the reference. CONSTITUTION:A density detection mark 2 printed at a specific position of a form 1 is irradiated by a light beam from a light emission source 3. Its refracted ray is detected by a photodetecting amplifier 4, also is implified, and is outputted. Its output voltage is applied to an integral network 7, is smoothed and is supplied to one input terminal of a differential amplifier 8. On the other hand, output voltage of the photodetecting amplifier 4 is supplied to the other input terminal of the differential amplifier 8. The differential amplifier 8 outputs a difference between an output of the integration network and an output of the photodetecting amplifier 4. Its output is compared with constant voltage of a constant voltage circuit 5 by a comparing circuit 6, and as a result, the density of a mark is measured exactly without being influenced by a material quality of the form, or mechanical variations of a detection mechanism, by constituting so as to detect density of a density detection mark 2 which exceeds a reference value out of them.
JP12272980A 1980-09-04 1980-09-04 Mark density measuring circuit Pending JPS5748162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12272980A JPS5748162A (en) 1980-09-04 1980-09-04 Mark density measuring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12272980A JPS5748162A (en) 1980-09-04 1980-09-04 Mark density measuring circuit

Publications (1)

Publication Number Publication Date
JPS5748162A true JPS5748162A (en) 1982-03-19

Family

ID=14843132

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12272980A Pending JPS5748162A (en) 1980-09-04 1980-09-04 Mark density measuring circuit

Country Status (1)

Country Link
JP (1) JPS5748162A (en)

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