JPS54103359A - Toner density controller - Google Patents

Toner density controller

Info

Publication number
JPS54103359A
JPS54103359A JP1081478A JP1081478A JPS54103359A JP S54103359 A JPS54103359 A JP S54103359A JP 1081478 A JP1081478 A JP 1081478A JP 1081478 A JP1081478 A JP 1081478A JP S54103359 A JPS54103359 A JP S54103359A
Authority
JP
Japan
Prior art keywords
toner
forming region
toner density
photodetector
lamp
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
JP1081478A
Other languages
Japanese (ja)
Inventor
Toyoki Tanaka
Toshio Yamagishi
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP1081478A priority Critical patent/JPS54103359A/en
Publication of JPS54103359A publication Critical patent/JPS54103359A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To automatically control so as to stabilize toner density in a fixed range, by optically detecting the toner image forming region and the not forming region of the ineffective image area of an photoreceptor and by controlling toner feed. CONSTITUTION:Toner image forming region 16 due to whole exposure and not forming region 19 are formed on ineffective image area 15a of photosensitive drum 4. Toner density if automatically controlled to be stable in a constant range by detecting regions 16 and 19 with lamp 17 and photodetector 18, and lamp 20 and photodetector 21, and by feeding toner from a toner feeder to a developing device when the toner density drops and the difference between the detected signal values of photodetectors 18 and 21 becomes lower than a predetermined value.
JP1081478A 1978-01-31 1978-01-31 Toner density controller Pending JPS54103359A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1081478A JPS54103359A (en) 1978-01-31 1978-01-31 Toner density controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1081478A JPS54103359A (en) 1978-01-31 1978-01-31 Toner density controller

Publications (1)

Publication Number Publication Date
JPS54103359A true JPS54103359A (en) 1979-08-14

Family

ID=11760807

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1081478A Pending JPS54103359A (en) 1978-01-31 1978-01-31 Toner density controller

Country Status (1)

Country Link
JP (1) JPS54103359A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57173865A (en) * 1981-04-21 1982-10-26 Fuji Xerox Co Ltd Picture density controller of electronic copier
JPS59128657U (en) * 1983-02-03 1984-08-29 株式会社東芝 developing device
US4866481A (en) * 1986-08-26 1989-09-12 Minolta Camera Kabushiki Kaisha Image forming apparatus having a plurality of developers and a detection and control arrangement for detecting the density of a formed image and a controller for controlling the density of the image

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57173865A (en) * 1981-04-21 1982-10-26 Fuji Xerox Co Ltd Picture density controller of electronic copier
JPH0241752B2 (en) * 1981-04-21 1990-09-19
JPS59128657U (en) * 1983-02-03 1984-08-29 株式会社東芝 developing device
US4866481A (en) * 1986-08-26 1989-09-12 Minolta Camera Kabushiki Kaisha Image forming apparatus having a plurality of developers and a detection and control arrangement for detecting the density of a formed image and a controller for controlling the density of the image

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