JPS5574532A - Lighting circuit of exposure lamp of copying machine - Google Patents
Lighting circuit of exposure lamp of copying machineInfo
- 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
Links
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62164342U (en) * | 1986-04-08 | 1987-10-19 |
-
1978
- 1978-11-29 JP JP14740078A patent/JPS5574532A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62164342U (en) * | 1986-04-08 | 1987-10-19 |
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