JPS5720766A - Method for detection of toner density - Google Patents

Method for detection of toner density

Info

Publication number
JPS5720766A
JPS5720766A JP9599580A JP9599580A JPS5720766A JP S5720766 A JPS5720766 A JP S5720766A JP 9599580 A JP9599580 A JP 9599580A JP 9599580 A JP9599580 A JP 9599580A JP S5720766 A JPS5720766 A JP S5720766A
Authority
JP
Japan
Prior art keywords
detection part
circuit
density
voltage
charge
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.)
Granted
Application number
JP9599580A
Other languages
Japanese (ja)
Other versions
JPS6336506B2 (en
Inventor
Teruyuki Onuma
Nobuo Mochizuki
Toshiyasu Kawabata
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP9599580A priority Critical patent/JPS5720766A/en
Publication of JPS5720766A publication Critical patent/JPS5720766A/en
Publication of JPS6336506B2 publication Critical patent/JPS6336506B2/ja
Granted 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
    • G03G15/0851—Detection or control means for the developer concentration the concentration being measured by electrical means
    • 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
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
    • G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch

Landscapes

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

Abstract

PURPOSE:To detect toner density always stably and accurately by adhering a developer consisting of two components to a detection part charged to a prescribed voltage and measuring the quantity of inductive electric charge at the time. CONSTITUTION:When the mixing ratio of magnetic carriers in a developer consisting of two conponents is increased, the quantity of electric charge per weight g/m is also increased. A detection part 4 charged to a prescribed voltage is provided on a photosensitive drum 2 to stick toner to the detection part 4 when passing through a developing roller 5. When a switch 28 is changed over to a contact (b), the charge with the reverse polarity to that of the detection part 4 is induced to the magnetic component in the developer. The quantity of inductive charge is measured by a voltage measuring circuit 9 and compared with the value the proper toner density from a reference signal generating circuit 12 through an opration circuit 11; when the density is low, a replenishing singnsl is outputted from a circuit 13. Thus, the density is detected accurately without influences such as particle size and the change of voltage.
JP9599580A 1980-07-14 1980-07-14 Method for detection of toner density Granted JPS5720766A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9599580A JPS5720766A (en) 1980-07-14 1980-07-14 Method for detection of toner density

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9599580A JPS5720766A (en) 1980-07-14 1980-07-14 Method for detection of toner density

Publications (2)

Publication Number Publication Date
JPS5720766A true JPS5720766A (en) 1982-02-03
JPS6336506B2 JPS6336506B2 (en) 1988-07-20

Family

ID=14152689

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9599580A Granted JPS5720766A (en) 1980-07-14 1980-07-14 Method for detection of toner density

Country Status (1)

Country Link
JP (1) JPS5720766A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284307A2 (en) * 1987-03-20 1988-09-28 Xerox Corporation Copier control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284307A2 (en) * 1987-03-20 1988-09-28 Xerox Corporation Copier control system

Also Published As

Publication number Publication date
JPS6336506B2 (en) 1988-07-20

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