JPS5574532A - Lighting circuit of exposure lamp of copying machine - Google Patents

Lighting circuit of exposure lamp of copying machine

Info

Publication number
JPS5574532A
JPS5574532A JP14740078A JP14740078A JPS5574532A JP S5574532 A JPS5574532 A JP S5574532A JP 14740078 A JP14740078 A JP 14740078A JP 14740078 A JP14740078 A JP 14740078A JP S5574532 A JPS5574532 A JP S5574532A
Authority
JP
Japan
Prior art keywords
lamp
exposure lamp
switch
copying machine
preheated
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
JP14740078A
Other languages
Japanese (ja)
Inventor
Goro Mori
Toshiyuki Ogawa
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 JP14740078A priority Critical patent/JPS5574532A/en
Publication of JPS5574532A publication Critical patent/JPS5574532A/en
Pending legal-status Critical Current

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Landscapes

  • Light Sources And Details Of Projection-Printing Devices (AREA)

Abstract

PURPOSE:To reduce power consumption and surely perform preheating of an exposure lamp by connecting a current supply circuit for part of the copying mechine constituting parts in parallel with an exposure lamp current-supply switch. CONSTITUTION:The portion AR being part of the copying machine constituting parts is held connected in parallel with a switch SW such as thyristor for lighting the exposure lamp HL of the copying machine. When the switch SW is OFF, the lamp HL and the portion AR are series-connected to an AC power source, by which small current is flowed and the lamp HL is preheated. When the switch SW goes ON, the portion AR is nearly shorted and the large current from the power source AC is applied to the preheated lamp HL, thus the lamp HL lights up normally. This connection eliminates the need for performing preheating of the exposure lamp for the purpose of letting it light up normally by way of a resistance or the like, prevents wasteful consumption of power and enables the exposure lamp to be preheated with less power consumption.
JP14740078A 1978-11-29 1978-11-29 Lighting circuit of exposure lamp of copying machine Pending JPS5574532A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14740078A JPS5574532A (en) 1978-11-29 1978-11-29 Lighting circuit of exposure lamp of copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14740078A JPS5574532A (en) 1978-11-29 1978-11-29 Lighting circuit of exposure lamp of copying machine

Publications (1)

Publication Number Publication Date
JPS5574532A true JPS5574532A (en) 1980-06-05

Family

ID=15429421

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14740078A Pending JPS5574532A (en) 1978-11-29 1978-11-29 Lighting circuit of exposure lamp of copying machine

Country Status (1)

Country Link
JP (1) JPS5574532A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62164342U (en) * 1986-04-08 1987-10-19

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62164342U (en) * 1986-04-08 1987-10-19

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