JPS57165748A - Detection circuit of quantity of toner - Google Patents

Detection circuit of quantity of toner

Info

Publication number
JPS57165748A
JPS57165748A JP5131981A JP5131981A JPS57165748A JP S57165748 A JPS57165748 A JP S57165748A JP 5131981 A JP5131981 A JP 5131981A JP 5131981 A JP5131981 A JP 5131981A JP S57165748 A JPS57165748 A JP S57165748A
Authority
JP
Japan
Prior art keywords
change
phase difference
phase
toner
voltage
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
JP5131981A
Other languages
Japanese (ja)
Other versions
JPH027422B2 (en
Inventor
Hiroshi Yamada
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
Toray Industries Inc
Original Assignee
Fujitsu Ltd
Toray Industries 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 Fujitsu Ltd, Toray Industries Inc filed Critical Fujitsu Ltd
Priority to JP5131981A priority Critical patent/JPS57165748A/en
Publication of JPS57165748A publication Critical patent/JPS57165748A/en
Publication of JPH027422B2 publication Critical patent/JPH027422B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To improve the precision of detection by detecting a phase difference between a voltage and a supply voltage based on the change in reactance when the change in reactance corresponding to the quantity of toner is detected. CONSTITUTION:A bridge circuit is formed of a capacitance C of a detection electrode changing in accordance with the quantity of toner and of resistors 3, 4 and 5. By forming a detection circuit in this way, the phase of a deviation voltage VD at intermediate points P and Q is also changed in accordance with the change in the capacitance C. Then, a reference value of the capacitance C is set so that the phase of the deviation voltage VD at the intermediate points P and Q is delayed by alpha from the phase of a voltage VO of an AC supply source 1. The phase difference at this time being taken as a reference, a change in phase difference from the reference phase difference alpha is detected. Since the change in reactance is converted into the change in phase difference in this way, the precision of detection can be improved.
JP5131981A 1981-04-06 1981-04-06 Detection circuit of quantity of toner Granted JPS57165748A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5131981A JPS57165748A (en) 1981-04-06 1981-04-06 Detection circuit of quantity of toner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5131981A JPS57165748A (en) 1981-04-06 1981-04-06 Detection circuit of quantity of toner

Publications (2)

Publication Number Publication Date
JPS57165748A true JPS57165748A (en) 1982-10-12
JPH027422B2 JPH027422B2 (en) 1990-02-19

Family

ID=12883590

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5131981A Granted JPS57165748A (en) 1981-04-06 1981-04-06 Detection circuit of quantity of toner

Country Status (1)

Country Link
JP (1) JPS57165748A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007034519A1 (en) * 2005-09-26 2007-03-29 Giottoindustrial Networking S.A. Method and apparatus for measuring capacity variations of a condenser

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03121312U (en) * 1990-03-12 1991-12-12

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5511254A (en) * 1978-07-11 1980-01-26 Ricoh Co Ltd Toner concentration detector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5511254A (en) * 1978-07-11 1980-01-26 Ricoh Co Ltd Toner concentration detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007034519A1 (en) * 2005-09-26 2007-03-29 Giottoindustrial Networking S.A. Method and apparatus for measuring capacity variations of a condenser

Also Published As

Publication number Publication date
JPH027422B2 (en) 1990-02-19

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