JPS559548A - Device having light source for exposure - Google Patents

Device having light source for exposure

Info

Publication number
JPS559548A
JPS559548A JP8227778A JP8227778A JPS559548A JP S559548 A JPS559548 A JP S559548A JP 8227778 A JP8227778 A JP 8227778A JP 8227778 A JP8227778 A JP 8227778A JP S559548 A JPS559548 A JP S559548A
Authority
JP
Japan
Prior art keywords
lighting
time
control
light quantity
accordance
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
JP8227778A
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 JP8227778A priority Critical patent/JPS559548A/en
Priority to GB7922040A priority patent/GB2024438B/en
Priority to US06/053,088 priority patent/US4320964A/en
Priority to DE2954647A priority patent/DE2954647C2/en
Priority to DE19792926360 priority patent/DE2926360A1/en
Publication of JPS559548A publication Critical patent/JPS559548A/en
Priority to GB08137972A priority patent/GB2108688B/en
Priority to GB08137971A priority patent/GB2108687B/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To prevent uneven exposure in lighting, by providing means for controlling the light quantity of a light source for exposure to control the start time of lighting of the source in accordance with the control quantity. CONSTITUTION:Variable resistors VR1 to VR3 for controlling the light quantity, and a delay circuit comprising capacity C1, resistors R8 to R10, and variable resistor VR4 are provided in order to control start time of lighting of the light source in accordance with the control quantity of the light quantity control means. On switching on a power source, a voltage higher than that defined by variable resistors VR1 to VR3 is produced from an output terminal, and then the voltage set with variable resistor VR2 is produced, resulting in improving rising of the lamp, and lighting of the lamp at the predetermined light quantity after a constant time. Temporary application of the higher rating voltage at the start of lighting shortens the rising time, and controlling variable resistor VR4 in accordance with the application time can cut down compensation time.
JP8227778A 1978-06-30 1978-07-06 Device having light source for exposure Pending JPS559548A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP8227778A JPS559548A (en) 1978-07-06 1978-07-06 Device having light source for exposure
GB7922040A GB2024438B (en) 1978-06-30 1979-06-25 Electrophotographic copier
US06/053,088 US4320964A (en) 1978-06-30 1979-06-28 Image formation apparatus
DE2954647A DE2954647C2 (en) 1978-06-30 1979-06-29 Electrophotographic copier with lamp control circuit
DE19792926360 DE2926360A1 (en) 1978-06-30 1979-06-29 IMAGE GENERATION DEVICE
GB08137972A GB2108688B (en) 1978-06-30 1981-12-16 Electrophotographic copier
GB08137971A GB2108687B (en) 1978-06-30 1981-12-16 Electrophotographic copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8227778A JPS559548A (en) 1978-07-06 1978-07-06 Device having light source for exposure

Publications (1)

Publication Number Publication Date
JPS559548A true JPS559548A (en) 1980-01-23

Family

ID=13769994

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8227778A Pending JPS559548A (en) 1978-06-30 1978-07-06 Device having light source for exposure

Country Status (1)

Country Link
JP (1) JPS559548A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56149054A (en) * 1980-04-19 1981-11-18 Ricoh Co Ltd Device for controlling charging and exposure in copying machine
JPS60136728A (en) * 1983-12-26 1985-07-20 Toshiba Corp Image forming device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56149054A (en) * 1980-04-19 1981-11-18 Ricoh Co Ltd Device for controlling charging and exposure in copying machine
JPS60136728A (en) * 1983-12-26 1985-07-20 Toshiba Corp Image forming device

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