JPS5522756A - Digital copying machine - Google Patents

Digital copying machine

Info

Publication number
JPS5522756A
JPS5522756A JP9603478A JP9603478A JPS5522756A JP S5522756 A JPS5522756 A JP S5522756A JP 9603478 A JP9603478 A JP 9603478A JP 9603478 A JP9603478 A JP 9603478A JP S5522756 A JPS5522756 A JP S5522756A
Authority
JP
Japan
Prior art keywords
density
correcting
densities
knobs
accordance
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
JP9603478A
Other languages
Japanese (ja)
Other versions
JPS6148304B2 (en
Inventor
Morizumi Kurose
Koichi Ejiri
Mamoru Maeda
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 JP9603478A priority Critical patent/JPS5522756A/en
Publication of JPS5522756A publication Critical patent/JPS5522756A/en
Publication of JPS6148304B2 publication Critical patent/JPS6148304B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Fax Reproducing Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Facsimiles In General (AREA)

Abstract

PURPOSE:To render image quality freely controllable, by correcting density of image data in accordance with the output signal of density correcting means provided according to each density level of an original. CONSTITUTION:Density correcting means 4 has density correcting knobs in accordance with 4 density levels 0 to 3, andeach knob slides along vertical lines m0 to m3 of matrix-shaped correcting panel 4M so as to change terminal voltages of variable resistors 60 to 63 linearily. When the knobs are in position A, voltages indicating densities 0 to 3 are delivered from resistors 60 to 63, undergo A/D conversion 70 to 73, and retained by latch circuits 80 to 83. When signals indicating original densities 3 to 0 enter decoder 90 in these state, density correcting circuit NC sends the signals of copy densities 3, 1, 1, 0, thus permitting density correction to be freely carried out in simple structure.
JP9603478A 1978-08-07 1978-08-07 Digital copying machine Granted JPS5522756A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9603478A JPS5522756A (en) 1978-08-07 1978-08-07 Digital copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9603478A JPS5522756A (en) 1978-08-07 1978-08-07 Digital copying machine

Publications (2)

Publication Number Publication Date
JPS5522756A true JPS5522756A (en) 1980-02-18
JPS6148304B2 JPS6148304B2 (en) 1986-10-23

Family

ID=14154148

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9603478A Granted JPS5522756A (en) 1978-08-07 1978-08-07 Digital copying machine

Country Status (1)

Country Link
JP (1) JPS5522756A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57500353A (en) * 1980-04-04 1982-02-25
JPS57131169A (en) * 1980-12-25 1982-08-13 Matsushita Giken Kk Gradation compensation device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4852440A (en) * 1971-11-02 1973-07-23
JPS493548A (en) * 1972-04-19 1974-01-12
JPS52108822A (en) * 1976-03-08 1977-09-12 Eastman Kodak Co Copying apparatus and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4852440A (en) * 1971-11-02 1973-07-23
JPS493548A (en) * 1972-04-19 1974-01-12
JPS52108822A (en) * 1976-03-08 1977-09-12 Eastman Kodak Co Copying apparatus and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57500353A (en) * 1980-04-04 1982-02-25
JPS57131169A (en) * 1980-12-25 1982-08-13 Matsushita Giken Kk Gradation compensation device
JPH0381346B2 (en) * 1980-12-25 1991-12-27 Matsushita Giken Kk

Also Published As

Publication number Publication date
JPS6148304B2 (en) 1986-10-23

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