JPS55151664A - Ground density adjusting device of copying machine - Google Patents

Ground density adjusting device of copying machine

Info

Publication number
JPS55151664A
JPS55151664A JP5909379A JP5909379A JPS55151664A JP S55151664 A JPS55151664 A JP S55151664A JP 5909379 A JP5909379 A JP 5909379A JP 5909379 A JP5909379 A JP 5909379A JP S55151664 A JPS55151664 A JP S55151664A
Authority
JP
Japan
Prior art keywords
bias potential
density
time
developing device
adjusting device
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
JP5909379A
Other languages
Japanese (ja)
Inventor
Akira Hirose
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 JP5909379A priority Critical patent/JPS55151664A/en
Publication of JPS55151664A publication Critical patent/JPS55151664A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To eliminate ground stains by detecting the density of the original before it is subjected to exposure lighting and applying the bias potential corresponding to that density.
CONSTITUTION: An original 10 is detected of its density by a detector 14 while it is passing. the quantity of the transmitted or reflected light detected by the detector 14 is operated by a density detecting circuit 26 and is changed to an electric signal as a coefficient of transmission or reflection. This signal is stored for the necessary time from the time when it is detected until the time when bias potential is output to a developing device 22, by a density detection value memory device 27. The bias potential of the developing device 22 is set by a bias potential setter 28 and the required bias potential is applied to the developing device 22 at the specified time by a bias potential outputting device 29.
COPYRIGHT: (C)1980,JPO&Japio
JP5909379A 1979-05-16 1979-05-16 Ground density adjusting device of copying machine Pending JPS55151664A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5909379A JPS55151664A (en) 1979-05-16 1979-05-16 Ground density adjusting device of copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5909379A JPS55151664A (en) 1979-05-16 1979-05-16 Ground density adjusting device of copying machine

Publications (1)

Publication Number Publication Date
JPS55151664A true JPS55151664A (en) 1980-11-26

Family

ID=13103368

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5909379A Pending JPS55151664A (en) 1979-05-16 1979-05-16 Ground density adjusting device of copying machine

Country Status (1)

Country Link
JP (1) JPS55151664A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6177874A (en) * 1984-09-25 1986-04-21 Fuji Xerox Co Ltd Copying machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6177874A (en) * 1984-09-25 1986-04-21 Fuji Xerox Co Ltd Copying machine

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