JPS5589872A - Toner concentration control device - Google Patents

Toner concentration control device

Info

Publication number
JPS5589872A
JPS5589872A JP16170478A JP16170478A JPS5589872A JP S5589872 A JPS5589872 A JP S5589872A JP 16170478 A JP16170478 A JP 16170478A JP 16170478 A JP16170478 A JP 16170478A JP S5589872 A JPS5589872 A JP S5589872A
Authority
JP
Japan
Prior art keywords
concentration
toner
output
amplifier
power source
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
JP16170478A
Other languages
Japanese (ja)
Other versions
JPS6224791B2 (en
Inventor
Tadahiro Eda
Susumu Tatsumi
Tsutomu Imai
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 JP16170478A priority Critical patent/JPS5589872A/en
Priority to US06/103,825 priority patent/US4279498A/en
Priority to DE2952672A priority patent/DE2952672C2/en
Publication of JPS5589872A publication Critical patent/JPS5589872A/en
Publication of JPS6224791B2 publication Critical patent/JPS6224791B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control Or Security For Electrophotography (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To control independently of the image forming conditions, by measuring the concentration on the photoreceptor to issue a concentration signal, and performing toner replenishment by judging from this concentration signal and the specified image forming conditions. CONSTITUTION:A development bias power source 4 is formed by plural power supplies E2-E4 and a selector switch S1 thereof. An amplifier A1 creates an output e1 corresponding to the quantity of light received by a photo diode D2, and this output becomes a concentration signal depending on the concentration on a photoreceptor 1. A development bias voltage Vd from the development bias power source 4 is divided down by voltage dividers R4, R5, and added to the concentration signal e1 in an addition circuit consisting of an amplifier A2 and resistances R6-R8. The output e2 of this addition circuit is compared with the reference voltage Vref made in the power source E5 and resistance R9 in an amplifier A3, and the toner concentration is set below a certain concentration, then the necessity of the toner replenishment is judged. The output E3 of this judgment is sent to the driving part of the toner replenishing mechanism in a developing device 3, so that the toner is sent into the developer.
JP16170478A 1978-12-28 1978-12-28 Toner concentration control device Granted JPS5589872A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP16170478A JPS5589872A (en) 1978-12-28 1978-12-28 Toner concentration control device
US06/103,825 US4279498A (en) 1978-12-28 1979-12-14 Electrostatographic copying apparatus with automatic toner density control
DE2952672A DE2952672C2 (en) 1978-12-28 1979-12-28 Electrophotographic copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16170478A JPS5589872A (en) 1978-12-28 1978-12-28 Toner concentration control device

Publications (2)

Publication Number Publication Date
JPS5589872A true JPS5589872A (en) 1980-07-07
JPS6224791B2 JPS6224791B2 (en) 1987-05-29

Family

ID=15740280

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16170478A Granted JPS5589872A (en) 1978-12-28 1978-12-28 Toner concentration control device

Country Status (1)

Country Link
JP (1) JPS5589872A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0588492A (en) * 1991-02-12 1993-04-09 Fuji Xerox Co Ltd Copying machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107922673B (en) * 2015-08-10 2020-06-05 巴斯夫欧洲公司 Phosphorus-containing 3-phenyl-benzofuran-2-one derivatives as stabilizers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0588492A (en) * 1991-02-12 1993-04-09 Fuji Xerox Co Ltd Copying machine

Also Published As

Publication number Publication date
JPS6224791B2 (en) 1987-05-29

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