JPS5622445A - Image forming unit - Google Patents

Image forming unit

Info

Publication number
JPS5622445A
JPS5622445A JP9778879A JP9778879A JPS5622445A JP S5622445 A JPS5622445 A JP S5622445A JP 9778879 A JP9778879 A JP 9778879A JP 9778879 A JP9778879 A JP 9778879A JP S5622445 A JPS5622445 A JP S5622445A
Authority
JP
Japan
Prior art keywords
light
exposure
adjustment
variable resistor
copying
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
JP9778879A
Other languages
Japanese (ja)
Inventor
Masahito Ishida
Katsuyoshi Maejima
Hisashi Sakamaki
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP9778879A priority Critical patent/JPS5622445A/en
Publication of JPS5622445A publication Critical patent/JPS5622445A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To make subtle density adjustment possible, by switching the electric power quantity for the lamp adjusted by a key to the adjustment quantity for standard light-exposure at a prescribed time after the end of copying and by inhibiting light quantity adjustment during light-exposure. CONSTITUTION:Variable resistor VR2 is provided for setting a light-exposure quantity and is arranged in the operation panel part of the copying machine as a light-exposure dial, and variable resistor VR3 is so operated that it becomes a proper value for the center value of variable resistor VR2 to perform fine adjustment of the light-exposure quantity, and further, variable resistor VR1 is operated to determine an adjustable voltage range by variable resistor VR2. Then, after the end of copying, the electric power quantity for lamp LA is switched to the adjustment quantity for standard light-exposure at a prescribed time, and further, light quantity adjustment is inhibited during light-exposure. Filter 3 to cut infrared rays is inserted to the light path of the optical system to prevent the bad influence upon the copied image dependent upon change of the spectral distribution characteristic of the light source for change of brightness of the light source.
JP9778879A 1979-07-31 1979-07-31 Image forming unit Pending JPS5622445A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9778879A JPS5622445A (en) 1979-07-31 1979-07-31 Image forming unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9778879A JPS5622445A (en) 1979-07-31 1979-07-31 Image forming unit

Publications (1)

Publication Number Publication Date
JPS5622445A true JPS5622445A (en) 1981-03-03

Family

ID=14201541

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9778879A Pending JPS5622445A (en) 1979-07-31 1979-07-31 Image forming unit

Country Status (1)

Country Link
JP (1) JPS5622445A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57188074A (en) * 1981-05-14 1982-11-18 Fuji Xerox Co Ltd Toner density adjusting device for copying machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5466137A (en) * 1977-11-07 1979-05-28 Fuji Xerox Co Ltd Method of controlling duplicator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5466137A (en) * 1977-11-07 1979-05-28 Fuji Xerox Co Ltd Method of controlling duplicator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57188074A (en) * 1981-05-14 1982-11-18 Fuji Xerox Co Ltd Toner density adjusting device for copying machine
JPH0373866B2 (en) * 1981-05-14 1991-11-25

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