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JPS5619038A - Control system of copy density in copying machine having variable power function - Google Patents

Control system of copy density in copying machine having variable power function

Info

Publication number
JPS5619038A
JPS5619038A JP9412979A JP9412979A JPS5619038A JP S5619038 A JPS5619038 A JP S5619038A JP 9412979 A JP9412979 A JP 9412979A JP 9412979 A JP9412979 A JP 9412979A JP S5619038 A JPS5619038 A JP S5619038A
Authority
JP
Japan
Prior art keywords
mode
variable power
exposure
lamp
phase angle
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
JP9412979A
Other languages
Japanese (ja)
Inventor
Kiyohiko Kobayashi
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 JP9412979A priority Critical patent/JPS5619038A/en
Publication of JPS5619038A publication Critical patent/JPS5619038A/en
Pending legal-status Critical Current

Links

Landscapes

  • Variable Magnification In Projection-Type Copying Machines (AREA)
  • Control Of Exposure In Printing And Copying (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE: To make possible copying of correct density corresponding to variable power modes with easy operation by controlling the quantity of light emission of an exposure lamp for irradiating the original according to the copying mode by way of a firing phase angle control circuit.
CONSTITUTION: According to the connection of a copying mode assigning switch SW to contacts (a), (b), unmagnification of scale-down mode is set and only the transistors Q1 and Q2 or Q2 of a firing phase angle control circuit PC is conducted. At the unmagnification mode, a capacitor C is rapidly charged. Thereby, the firing phase angle of the firing signal of a lamp L for original exposure is controlled via a UJT and a pulse transformer PT and the original is irradiated at the exposure of the lamp L corresponding to the variable power mode. Hence, the need for such an operation as adjusting exposure via a switch etc. is eliminated.
COPYRIGHT: (C)1981,JPO&Japio
JP9412979A 1979-07-24 1979-07-24 Control system of copy density in copying machine having variable power function Pending JPS5619038A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9412979A JPS5619038A (en) 1979-07-24 1979-07-24 Control system of copy density in copying machine having variable power function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9412979A JPS5619038A (en) 1979-07-24 1979-07-24 Control system of copy density in copying machine having variable power function

Publications (1)

Publication Number Publication Date
JPS5619038A true JPS5619038A (en) 1981-02-23

Family

ID=14101792

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9412979A Pending JPS5619038A (en) 1979-07-24 1979-07-24 Control system of copy density in copying machine having variable power function

Country Status (1)

Country Link
JP (1) JPS5619038A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5844435A (en) * 1981-09-11 1983-03-15 Fuji Xerox Co Ltd Microfilm copying machine
JPS59202454A (en) * 1983-05-04 1984-11-16 Toshiba Corp Exposure controller
JPS6017438A (en) * 1983-07-11 1985-01-29 Toshiba Corp Exposure control device
JPS60112032A (en) * 1983-11-22 1985-06-18 Matsushita Electric Ind Co Ltd Electrophotographic copying machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5844435A (en) * 1981-09-11 1983-03-15 Fuji Xerox Co Ltd Microfilm copying machine
JPS59202454A (en) * 1983-05-04 1984-11-16 Toshiba Corp Exposure controller
JPH0555855B2 (en) * 1983-05-04 1993-08-18 Tokyo Shibaura Electric Co
JPS6017438A (en) * 1983-07-11 1985-01-29 Toshiba Corp Exposure control device
JPS60112032A (en) * 1983-11-22 1985-06-18 Matsushita Electric Ind Co Ltd Electrophotographic copying machine

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