JPS5714864A - Detection system for toner concentration - Google Patents

Detection system for toner concentration

Info

Publication number
JPS5714864A
JPS5714864A JP8865580A JP8865580A JPS5714864A JP S5714864 A JPS5714864 A JP S5714864A JP 8865580 A JP8865580 A JP 8865580A JP 8865580 A JP8865580 A JP 8865580A JP S5714864 A JPS5714864 A JP S5714864A
Authority
JP
Japan
Prior art keywords
paper
toner
density
optical density
output
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
JP8865580A
Other languages
Japanese (ja)
Inventor
Hideaki Sano
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP8865580A priority Critical patent/JPS5714864A/en
Publication of JPS5714864A publication Critical patent/JPS5714864A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
    • G03G15/0849—Detection or control means for the developer concentration
    • G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00025—Machine control, e.g. regulating different parts of the machine
    • G03G2215/00029—Image density detection
    • G03G2215/00067—Image density detection on recording medium

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To maintain relative toner conc. with respect to the concn. of paper constant and eliminate detection errors for the vertical movement of the paper by correcting the errors in the detection output of the optical density of a toner mark by the output of the optical density of the paper. CONSTITUTION:Detecting heads 21, 22 for density are provided in a position where the toner mark MK on paper 3 does not pass and where it passes, and these detect the optical density of the paper and the optical density of the mark MK, respectively. The outputs thereof are negated of common components of both by a differential amplifier 4, and are compared with set values in a detecting circuit 6, according to which a toner is replenished. Thereby, only the toner conc. is contained in the output because the common components are negated by the amplifier 4 despite the occurrence of a change in the density of the paper itself and the vertical movement of the paper owing to its transfer, whereby the relative toner concn. with respect to the density of the paper is made constant. The output changes owing to the vertical movement of the paper are roughly equal with both heads, and the errors thereof are eliminated.
JP8865580A 1980-06-30 1980-06-30 Detection system for toner concentration Pending JPS5714864A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8865580A JPS5714864A (en) 1980-06-30 1980-06-30 Detection system for toner concentration

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8865580A JPS5714864A (en) 1980-06-30 1980-06-30 Detection system for toner concentration

Publications (1)

Publication Number Publication Date
JPS5714864A true JPS5714864A (en) 1982-01-26

Family

ID=13948831

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8865580A Pending JPS5714864A (en) 1980-06-30 1980-06-30 Detection system for toner concentration

Country Status (1)

Country Link
JP (1) JPS5714864A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0949543A3 (en) * 1998-04-10 2000-07-26 Nec Corporation Method and arrangement for adjusting density in electrophotographic printing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0949543A3 (en) * 1998-04-10 2000-07-26 Nec Corporation Method and arrangement for adjusting density in electrophotographic printing

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