JPS5694371A - Exposure control device - Google Patents
Exposure control deviceInfo
- 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
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.
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)
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)
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 |
-
1979
- 1979-12-27 JP JP17240879A patent/JPS5694371A/en active Pending
Patent Citations (2)
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)
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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