JPS6450072A - Automatic density adjusting device of image forming device - Google Patents

Automatic density adjusting device of image forming device

Info

Publication number
JPS6450072A
JPS6450072A JP62207607A JP20760787A JPS6450072A JP S6450072 A JPS6450072 A JP S6450072A JP 62207607 A JP62207607 A JP 62207607A JP 20760787 A JP20760787 A JP 20760787A JP S6450072 A JPS6450072 A JP S6450072A
Authority
JP
Japan
Prior art keywords
density
original
effective detection
detection area
area
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
JP62207607A
Other languages
Japanese (ja)
Other versions
JP2677357B2 (en
Inventor
Minoru Aoki
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 JP62207607A priority Critical patent/JP2677357B2/en
Publication of JPS6450072A publication Critical patent/JPS6450072A/en
Application granted granted Critical
Publication of JP2677357B2 publication Critical patent/JP2677357B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Holders For Sensitive Materials And Originals (AREA)
  • Developing For Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To make a proper automatic density adjustment without any prescanning by varying the size of an effective detection area according to a specified trimming area. CONSTITUTION:A lamp 4, a carriage 7, an optical fiber 20, a photodetecting element 29, and a peak holding circuit 27 constitute a density detecting means, which detects density information on the effective detection area of an original O optically when the original O is lighted and scanned, and converts it into an electric signal. A control means CPU 28 processes the density information generated by this density detecting means and controls a developing bias, etc., to adjust and control the image density of a recording image. Then the size of the effective detection area is varied according to the specified trimming area. Thus, when the original is lighted and scanned, the density information in the trimming area is detected and the density of the recording image is adjusted according to the result, so the accuracy of the automatic density adjustment is improved without any prescanning.
JP62207607A 1987-08-21 1987-08-21 Automatic density adjusting device in image forming apparatus Expired - Fee Related JP2677357B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62207607A JP2677357B2 (en) 1987-08-21 1987-08-21 Automatic density adjusting device in image forming apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62207607A JP2677357B2 (en) 1987-08-21 1987-08-21 Automatic density adjusting device in image forming apparatus

Publications (2)

Publication Number Publication Date
JPS6450072A true JPS6450072A (en) 1989-02-27
JP2677357B2 JP2677357B2 (en) 1997-11-17

Family

ID=16542580

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62207607A Expired - Fee Related JP2677357B2 (en) 1987-08-21 1987-08-21 Automatic density adjusting device in image forming apparatus

Country Status (1)

Country Link
JP (1) JP2677357B2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6295554A (en) * 1985-10-22 1987-05-02 Canon Inc Image forming device
JPS62113177A (en) * 1985-11-13 1987-05-25 Ricoh Co Ltd Original density detector in image forming device
JPS638759A (en) * 1986-06-30 1988-01-14 Mita Ind Co Ltd Image density controller

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6295554A (en) * 1985-10-22 1987-05-02 Canon Inc Image forming device
JPS62113177A (en) * 1985-11-13 1987-05-25 Ricoh Co Ltd Original density detector in image forming device
JPS638759A (en) * 1986-06-30 1988-01-14 Mita Ind Co Ltd Image density controller

Also Published As

Publication number Publication date
JP2677357B2 (en) 1997-11-17

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees