JPS57111566A - Detecting circuit for toner density - Google Patents

Detecting circuit for toner density

Info

Publication number
JPS57111566A
JPS57111566A JP18530780A JP18530780A JPS57111566A JP S57111566 A JPS57111566 A JP S57111566A JP 18530780 A JP18530780 A JP 18530780A JP 18530780 A JP18530780 A JP 18530780A JP S57111566 A JPS57111566 A JP S57111566A
Authority
JP
Japan
Prior art keywords
voltage
variation
toner density
vector
detecting circuit
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
JP18530780A
Other languages
Japanese (ja)
Other versions
JPS6367653B2 (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 JP18530780A priority Critical patent/JPS57111566A/en
Publication of JPS57111566A publication Critical patent/JPS57111566A/en
Publication of JPS6367653B2 publication Critical patent/JPS6367653B2/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
    • G03G15/0853—Detection or control means for the developer concentration the concentration being measured by magnetic means

Landscapes

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

Abstract

PURPOSE:To control toner density with high sensitivity and high precision without the influence of environmental variation, by detecting a phase difference between a power voltage and a voltage based upon variation in reactance and by supplying toner in the amount which corresponds to the difference. CONSTITUTION:When voltage of an AC power source 1, a detection coil 2, and resistances 3, 4 and 5 are V0, VL, V3, V4 and V5 and a deviation voltage between intermediate points P and Q is VD, VD=V4+V5=VL+V3, and VD=V3- V5; when V4=V5, VD=V3-1/2V0. Further, the voltages VL and V3 are 90 deg. out of phase, and the vector of the voltage V3 moves at a point Q on a circumference having a diameter equivalent to the voltage V0. The vector of the VD, on the other hand, is expressed by PQ. When the conductance of a detection coil varies, the Q changes into a Q' and a control voltage proportional to variation theta in phase difference, thereby supplying toner in accordance with the voltage.
JP18530780A 1980-12-29 1980-12-29 Detecting circuit for toner density Granted JPS57111566A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18530780A JPS57111566A (en) 1980-12-29 1980-12-29 Detecting circuit for toner density

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18530780A JPS57111566A (en) 1980-12-29 1980-12-29 Detecting circuit for toner density

Publications (2)

Publication Number Publication Date
JPS57111566A true JPS57111566A (en) 1982-07-12
JPS6367653B2 JPS6367653B2 (en) 1988-12-27

Family

ID=16168560

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18530780A Granted JPS57111566A (en) 1980-12-29 1980-12-29 Detecting circuit for toner density

Country Status (1)

Country Link
JP (1) JPS57111566A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5985949A (en) * 1982-08-27 1984-05-18 エンドレス・ウント・ハウザ−・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング・ウント・コンパニ− Method and device for measuring fouling of capacity type dewpoint sensor
WO1984002202A1 (en) * 1982-11-29 1984-06-07 Hitachi Metals Ltd Apparatus for controlling toner concentration in developer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5099552A (en) * 1973-12-29 1975-08-07

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5099552A (en) * 1973-12-29 1975-08-07

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5985949A (en) * 1982-08-27 1984-05-18 エンドレス・ウント・ハウザ−・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング・ウント・コンパニ− Method and device for measuring fouling of capacity type dewpoint sensor
JPH0260141B2 (en) * 1982-08-27 1990-12-14 Endress Hauser Gmbh Co
WO1984002202A1 (en) * 1982-11-29 1984-06-07 Hitachi Metals Ltd Apparatus for controlling toner concentration in developer
US4592645A (en) * 1982-11-29 1986-06-03 Hitachi Metals, Ltd. Apparatus for controlling concentration of toner in developer

Also Published As

Publication number Publication date
JPS6367653B2 (en) 1988-12-27

Similar Documents

Publication Publication Date Title
GB1381307A (en) Method for the measurement of direct currents with floating input and direct time indication
JPS57111566A (en) Detecting circuit for toner density
SE0000641L (en) Method and a device for charging a battery
JPS55106478A (en) Electrostatic latent image developing unit
GB936045A (en) Improvements in or relating to apparatus for measuring or responsive to the conductivity of a material
JPS5688142A (en) Image density control device
JPS5649699A (en) Controlling device for engine generator
JPS5368290A (en) Insulation resistance measuring apparatus of ground system
JPS568563A (en) Measuring device for reactance change
JPS5579474A (en) Concentration detecting method of developer
JPS5624551A (en) Device for measuring corrosion speed of metal
JPS557786A (en) Surface potential stabilizing method of photoreceptor
JPS57165748A (en) Detection circuit of quantity of toner
JPS5796372A (en) Magnetic brush developing device
JPS5735765A (en) Electric field intensity measuring device
JPS5290942A (en) Electrostatic printing
JPS5766445A (en) Controlling method for extent of charging of electrophotographic copying machine
JPS54148293A (en) Detecting laid position of submarine cable
JPS54105756A (en) Reactive power compensator for varying load
SU739445A1 (en) Device for measuring coercive force of ferromagnetic materials in flow
JPS5588185A (en) Counter with read device
JPS6440867A (en) Transfer material separating device for image forming device
JPS5540974A (en) Signal detection circuit
JPS5720766A (en) Method for detection of toner density
JPS5522175A (en) Sensor circuit