JPS64582A - Picture density controller - Google Patents

Picture density controller

Info

Publication number
JPS64582A
JPS64582A JP63058966A JP5896688A JPS64582A JP S64582 A JPS64582 A JP S64582A JP 63058966 A JP63058966 A JP 63058966A JP 5896688 A JP5896688 A JP 5896688A JP S64582 A JPS64582 A JP S64582A
Authority
JP
Japan
Prior art keywords
value
ground part
density
photosensitive body
output 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
JP63058966A
Other languages
Japanese (ja)
Other versions
JPH01582A (en
JP2751185B2 (en
Inventor
Koji Matsushita
Keigo Tange
Shizuo Yuge
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP63058966A priority Critical patent/JP2751185B2/en
Publication of JPH01582A publication Critical patent/JPH01582A/en
Publication of JPS64582A publication Critical patent/JPS64582A/en
Application granted granted Critical
Publication of JP2751185B2 publication Critical patent/JP2751185B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To detect an exact picture density without being affected by the contamination of a sensor, the ground fogging of the surface of a photosensitive body, a change in the reflectivity thereof, etc., by providing a means for forming a non-developing part where a toner is not stuck onto the photosensitive body. CONSTITUTION:The non-developing part where the toner is not stuck is formed on the surface of the photosensitive body 31. The output voltage B in a white ground part and the output voltage in a black ground part C are respectively corrected by the value of the ratio between the non-development reference value A' which is the initial value of said part and the non-development output value A which is said value but is changed with lapse of time by the contamination of the density sensor and the change in the surface condition of the photosensitive body 31. The output voltage C of the black ground part is further corrected by the control value of the white ground part. The density in the black ground part and the density in the white ground part are thereby simultaneously corrected. The exact control of the picture density is thus enabled without being affected by the ground fogging of the white ground part.
JP63058966A 1987-03-12 1988-03-11 Image density control device Expired - Lifetime JP2751185B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63058966A JP2751185B2 (en) 1987-03-12 1988-03-11 Image density control device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP5747687 1987-03-12
JP62-57476 1987-03-12
JP63058966A JP2751185B2 (en) 1987-03-12 1988-03-11 Image density control device

Publications (3)

Publication Number Publication Date
JPH01582A JPH01582A (en) 1989-01-05
JPS64582A true JPS64582A (en) 1989-01-05
JP2751185B2 JP2751185B2 (en) 1998-05-18

Family

ID=26398535

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63058966A Expired - Lifetime JP2751185B2 (en) 1987-03-12 1988-03-11 Image density control device

Country Status (1)

Country Link
JP (1) JP2751185B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3420345A1 (en) 1983-05-31 1984-12-06 Nippondenso Co., Ltd., Kariya, Aichi FUEL INJECTION PUMP
JPH0392874A (en) * 1989-09-05 1991-04-18 Minolta Camera Co Ltd Image forming device
JP2006225080A (en) * 2005-02-16 2006-08-31 Toshiba Elevator Co Ltd Control device for door of elevator
JP2011158605A (en) * 2010-01-29 2011-08-18 Canon Inc Image forming apparatus and control method of the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5981665A (en) * 1982-07-12 1984-05-11 Ricoh Co Ltd Picture density adjusting method of copying machine
JPS6049363A (en) * 1983-08-29 1985-03-18 Fuji Xerox Co Ltd Development density detector
JPS6199162U (en) * 1984-12-03 1986-06-25

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5981665A (en) * 1982-07-12 1984-05-11 Ricoh Co Ltd Picture density adjusting method of copying machine
JPS6049363A (en) * 1983-08-29 1985-03-18 Fuji Xerox Co Ltd Development density detector
JPS6199162U (en) * 1984-12-03 1986-06-25

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3420345A1 (en) 1983-05-31 1984-12-06 Nippondenso Co., Ltd., Kariya, Aichi FUEL INJECTION PUMP
JPH0392874A (en) * 1989-09-05 1991-04-18 Minolta Camera Co Ltd Image forming device
JP2006225080A (en) * 2005-02-16 2006-08-31 Toshiba Elevator Co Ltd Control device for door of elevator
JP2011158605A (en) * 2010-01-29 2011-08-18 Canon Inc Image forming apparatus and control method of the same

Also Published As

Publication number Publication date
JP2751185B2 (en) 1998-05-18

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