JPS647031A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPS647031A JPS647031A JP16305287A JP16305287A JPS647031A JP S647031 A JPS647031 A JP S647031A JP 16305287 A JP16305287 A JP 16305287A JP 16305287 A JP16305287 A JP 16305287A JP S647031 A JPS647031 A JP S647031A
- Authority
- JP
- Japan
- Prior art keywords
- exposure
- voltage
- reference voltage
- control
- original
- 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
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Of Exposure In Printing And Copying (AREA)
Abstract
PURPOSE:To execute the proper control of exposure by moving a detection means to the corresponding position when an indication is executed by an indication means and executing the control of the exposure based on the detection signal from the detection means. CONSTITUTION:A density signal is outputted to an automatic exposure circuit 40 and a reference voltage generation circuit 43 generates a reference voltage according to the supplied density signal. The reference voltage and an output voltage from a feedback transformer 34 are compared in a differential amplifier 37 and the voltage in accordance with the difference between both voltages is supplied to a trigger pulse generation circuit 44. And it generates the trigger pulse synchronizing with the frequency of a power source 31 according to the inputted output voltage from the differential amplifier 37 so as to control the conduction angle of a thyristor 32 and the effective value of the voltage impressed on both ends of an exposure lamp 8 is controlled. Thus, the light quantity of the exposure lamp 8 is controlled according to the change of the density of the image in a specified area and an original 2, so that the proper exposure corresponding to the image in a part of the original 2, that means, in an automatic exposure area can be obtained.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16305287A JPS647031A (en) | 1987-06-30 | 1987-06-30 | Image forming device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16305287A JPS647031A (en) | 1987-06-30 | 1987-06-30 | Image forming device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS647031A true JPS647031A (en) | 1989-01-11 |
Family
ID=15766258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16305287A Pending JPS647031A (en) | 1987-06-30 | 1987-06-30 | Image forming device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS647031A (en) |
-
1987
- 1987-06-30 JP JP16305287A patent/JPS647031A/en active Pending
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