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JPS55127574A - Drift compensating method of toner density detector in electrophotographic copier - Google Patents

Drift compensating method of toner density detector in electrophotographic copier

Info

Publication number
JPS55127574A
JPS55127574A JP3423479A JP3423479A JPS55127574A JP S55127574 A JPS55127574 A JP S55127574A JP 3423479 A JP3423479 A JP 3423479A JP 3423479 A JP3423479 A JP 3423479A JP S55127574 A JPS55127574 A JP S55127574A
Authority
JP
Japan
Prior art keywords
detector
drift
amplifier
detection
toner density
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
JP3423479A
Other languages
Japanese (ja)
Other versions
JPH0231386B2 (en
Inventor
Masaaki Tanaka
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.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox 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 Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP3423479A priority Critical patent/JPS55127574A/en
Publication of JPS55127574A publication Critical patent/JPS55127574A/en
Publication of JPH0231386B2 publication Critical patent/JPH0231386B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control Or Security For Electrophotography (AREA)
  • Developing For Electrophotography (AREA)

Abstract

PURPOSE: To perform detection of always accurate toner images by specifying the forming method of detection signal.
CONSTITUTION: A drift compensating circuit 13 constituted by a differential amplifier 33 and holding circuit 34 is connected to the amplifier 12 disposed to the stage next to a toner density detector 10. Then, when an analog switch 31 is turned ON in the state that the light emitting element 10a of the detector 10 is turned OFF for a fixed time after the operation start of the copying machine body, the drift potential generated in the detector 10 and amplifier 12 is charged and stored in a capacitor 32 and this storage value is fed back to one input side of the differential amplifier 33 through the holding circuit 34, and when the light emitting element 10a goes ON and the detector 10 detects the toner image density, the drift portion contained in the detection signal is cancelled. Hence, the detection of the always accurate toner image density is accomplished and the control accuracy and reliability in the various control circuit 22 improve.
COPYRIGHT: (C)1980,JPO&Japio
JP3423479A 1979-03-26 1979-03-26 Drift compensating method of toner density detector in electrophotographic copier Granted JPS55127574A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3423479A JPS55127574A (en) 1979-03-26 1979-03-26 Drift compensating method of toner density detector in electrophotographic copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3423479A JPS55127574A (en) 1979-03-26 1979-03-26 Drift compensating method of toner density detector in electrophotographic copier

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP63122029A Division JPH01118157A (en) 1988-05-20 1988-05-20 Image density detecting device for an electronic copying machine

Publications (2)

Publication Number Publication Date
JPS55127574A true JPS55127574A (en) 1980-10-02
JPH0231386B2 JPH0231386B2 (en) 1990-07-12

Family

ID=12408454

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3423479A Granted JPS55127574A (en) 1979-03-26 1979-03-26 Drift compensating method of toner density detector in electrophotographic copier

Country Status (1)

Country Link
JP (1) JPS55127574A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5764168A (en) * 1980-10-06 1982-04-19 Ricoh Co Ltd Non-contact type electrometer
JPS5876832A (en) * 1981-11-02 1983-05-10 Konishiroku Photo Ind Co Ltd Metallic image forming material
JPS5879737U (en) * 1981-11-24 1983-05-30 日本電気株式会社 Print density control device
JPS60212781A (en) * 1984-04-06 1985-10-25 Konishiroku Photo Ind Co Ltd Electrostatic copying and recording device
JPS60260067A (en) * 1984-06-06 1985-12-23 Canon Inc Controlling method of electrophotography

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4851677A (en) * 1971-10-29 1973-07-20
JPS5118182U (en) * 1974-07-29 1976-02-09
JPS5393030A (en) * 1977-01-27 1978-08-15 Ricoh Co Ltd Copying process control method of electrophotographic copying machine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5118182B2 (en) * 1971-08-06 1976-06-08

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4851677A (en) * 1971-10-29 1973-07-20
JPS5118182U (en) * 1974-07-29 1976-02-09
JPS5393030A (en) * 1977-01-27 1978-08-15 Ricoh Co Ltd Copying process control method of electrophotographic copying machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5764168A (en) * 1980-10-06 1982-04-19 Ricoh Co Ltd Non-contact type electrometer
JPS5876832A (en) * 1981-11-02 1983-05-10 Konishiroku Photo Ind Co Ltd Metallic image forming material
JPS5879737U (en) * 1981-11-24 1983-05-30 日本電気株式会社 Print density control device
JPS60212781A (en) * 1984-04-06 1985-10-25 Konishiroku Photo Ind Co Ltd Electrostatic copying and recording device
JPS60260067A (en) * 1984-06-06 1985-12-23 Canon Inc Controlling method of electrophotography

Also Published As

Publication number Publication date
JPH0231386B2 (en) 1990-07-12

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