JPS647031A - Image forming device - Google Patents

Image forming device

Info

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
Application number
JP16305287A
Other languages
Japanese (ja)
Inventor
Yasuhiro Iwata
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP16305287A priority Critical patent/JPS647031A/en
Publication of JPS647031A publication Critical patent/JPS647031A/en
Pending legal-status Critical Current

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.
JP16305287A 1987-06-30 1987-06-30 Image forming device Pending JPS647031A (en)

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)

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