JPS5579474A - Concentration detecting method of developer - Google Patents

Concentration detecting method of developer

Info

Publication number
JPS5579474A
JPS5579474A JP15469878A JP15469878A JPS5579474A JP S5579474 A JPS5579474 A JP S5579474A JP 15469878 A JP15469878 A JP 15469878A JP 15469878 A JP15469878 A JP 15469878A JP S5579474 A JPS5579474 A JP S5579474A
Authority
JP
Japan
Prior art keywords
developer
electrodes
pair
toner
concentration
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
JP15469878A
Other languages
Japanese (ja)
Inventor
Masaharu Okubo
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 JP15469878A priority Critical patent/JPS5579474A/en
Publication of JPS5579474A publication Critical patent/JPS5579474A/en
Pending legal-status Critical Current

Links

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To detect the concentration of developer by applying AC voltage of more than a fixed frequency between a pair of electrodes sandwiching the developer and measuring the change in the electrostatic capacity between the electrodes. CONSTITUTION:Arrangement is so made that two-component type developer 2 passes between a pair of electrode plates 1. The electrodes 1 are connected to an AC power source 3 and are connected on their way with a protection resistance 4 and current measuring device 5. According to the measurement value of the current measuring device 5, the supplementing of the toner is controlled with a toner supplement contol unit. When AC of more than a fixed frequency is applied to a pair of said electrode plates, the current flowing between the electrodes is inversely proportional to capacitance and therefore the change in the toner concentration may be known.
JP15469878A 1978-12-13 1978-12-13 Concentration detecting method of developer Pending JPS5579474A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15469878A JPS5579474A (en) 1978-12-13 1978-12-13 Concentration detecting method of developer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15469878A JPS5579474A (en) 1978-12-13 1978-12-13 Concentration detecting method of developer

Publications (1)

Publication Number Publication Date
JPS5579474A true JPS5579474A (en) 1980-06-14

Family

ID=15589982

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15469878A Pending JPS5579474A (en) 1978-12-13 1978-12-13 Concentration detecting method of developer

Country Status (1)

Country Link
JP (1) JPS5579474A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58157343U (en) * 1982-04-13 1983-10-20 三洋電機株式会社 Developing device of electrophotographic copying machine
JPS5919974A (en) * 1982-07-26 1984-02-01 Matsushita Electric Ind Co Ltd Developing device
US5318431A (en) * 1984-07-13 1994-06-07 Xerox Corporation Process and apparatus for preparing toner particles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58157343U (en) * 1982-04-13 1983-10-20 三洋電機株式会社 Developing device of electrophotographic copying machine
JPS5919974A (en) * 1982-07-26 1984-02-01 Matsushita Electric Ind Co Ltd Developing device
US5318431A (en) * 1984-07-13 1994-06-07 Xerox Corporation Process and apparatus for preparing toner particles

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