JPS5694371A - Exposure control device - Google Patents

Exposure control device

Info

Publication number
JPS5694371A
JPS5694371A JP17240879A JP17240879A JPS5694371A JP S5694371 A JPS5694371 A JP S5694371A JP 17240879 A JP17240879 A JP 17240879A JP 17240879 A JP17240879 A JP 17240879A JP S5694371 A JPS5694371 A JP S5694371A
Authority
JP
Japan
Prior art keywords
lamp
aperture
illuminance
light
signal
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
JP17240879A
Other languages
Japanese (ja)
Inventor
Masahiro Tomosada
Haruhisa Honda
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 JP17240879A priority Critical patent/JPS5694371A/en
Publication of JPS5694371A publication Critical patent/JPS5694371A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Or Security For Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Of Exposure In Printing And Copying (AREA)

Abstract

PURPOSE:To compensate the illuminance on a photoreceptor by detecting the decrease of the quantity of light of a lighting lamp for an original down to the outside of a control range by lamp voltage or a photodetector and changing the lens aperture of an optical system for the degraded part. CONSTITUTION:When a detected value V1 becomes smaller than the preset light lower limit value V2 and an illuminance drop signal is generated during controlling operation by an exposure control circuit, the output of an amplifier Q2 rises to H. If at this time a lamp L is lighting and yet the decreasing signal is generated continuously for more than the timing time of a timer T2, it is regarded that the lamp or circuit has deteriorated, and a transistor Tr1 which is controlled to produce output by the deterioration detection is turned ON to wider an aperture 7 and restore and correct the quantity of light. The aperture is controlled by changing, for example, aperture area, with a step motor. More specifically, the deteriorated signal LL is converted into predetermined pulses, and said pulses are counted to change a plate 7 as specified. With this constitution the illuminance on a photoreceptor is compensated.
JP17240879A 1979-12-27 1979-12-27 Exposure control device Pending JPS5694371A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17240879A JPS5694371A (en) 1979-12-27 1979-12-27 Exposure control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17240879A JPS5694371A (en) 1979-12-27 1979-12-27 Exposure control device

Publications (1)

Publication Number Publication Date
JPS5694371A true JPS5694371A (en) 1981-07-30

Family

ID=15941395

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17240879A Pending JPS5694371A (en) 1979-12-27 1979-12-27 Exposure control device

Country Status (1)

Country Link
JP (1) JPS5694371A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5951353U (en) * 1982-09-28 1984-04-04 コニカ株式会社 recording device
JPS59149338A (en) * 1983-02-15 1984-08-27 Konishiroku Photo Ind Co Ltd Detector for abnormality of exposure lamp in electrophotographic copying device
JPS60250363A (en) * 1984-05-25 1985-12-11 Casio Comput Co Ltd Image forming device
JPS62106478A (en) * 1985-11-05 1987-05-16 Konishiroku Photo Ind Co Ltd Exposure controller
JPH02259634A (en) * 1988-12-05 1990-10-22 Eastman Kodak Co Apparatus for exposing photographic material
JPH02259635A (en) * 1988-12-05 1990-10-22 Eastman Kodak Co Light source apparatus with fixed color temperature and irradiation intensity
JPH02262635A (en) * 1988-12-05 1990-10-25 Eastman Kodak Co Variable brightness light emitter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5214422A (en) * 1975-07-24 1977-02-03 Fuji Xerox Co Ltd Automatic control method of exposure for the electrophotographic copying machine
JPS52128133A (en) * 1976-04-21 1977-10-27 Ricoh Co Ltd Detection of abnormal phenomenon of copier sequence

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5214422A (en) * 1975-07-24 1977-02-03 Fuji Xerox Co Ltd Automatic control method of exposure for the electrophotographic copying machine
JPS52128133A (en) * 1976-04-21 1977-10-27 Ricoh Co Ltd Detection of abnormal phenomenon of copier sequence

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5951353U (en) * 1982-09-28 1984-04-04 コニカ株式会社 recording device
JPS59149338A (en) * 1983-02-15 1984-08-27 Konishiroku Photo Ind Co Ltd Detector for abnormality of exposure lamp in electrophotographic copying device
JPS60250363A (en) * 1984-05-25 1985-12-11 Casio Comput Co Ltd Image forming device
JPS62106478A (en) * 1985-11-05 1987-05-16 Konishiroku Photo Ind Co Ltd Exposure controller
JPH02259634A (en) * 1988-12-05 1990-10-22 Eastman Kodak Co Apparatus for exposing photographic material
JPH02259635A (en) * 1988-12-05 1990-10-22 Eastman Kodak Co Light source apparatus with fixed color temperature and irradiation intensity
JPH02262635A (en) * 1988-12-05 1990-10-25 Eastman Kodak Co Variable brightness light emitter

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