JPS55156932A - Exposure control system - Google Patents

Exposure control system

Info

Publication number
JPS55156932A
JPS55156932A JP6463479A JP6463479A JPS55156932A JP S55156932 A JPS55156932 A JP S55156932A JP 6463479 A JP6463479 A JP 6463479A JP 6463479 A JP6463479 A JP 6463479A JP S55156932 A JPS55156932 A JP S55156932A
Authority
JP
Japan
Prior art keywords
lamp
mucpu
illuminance
radiated
electric current
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
JP6463479A
Other languages
Japanese (ja)
Inventor
Fumio Asano
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP6463479A priority Critical patent/JPS55156932A/en
Publication of JPS55156932A publication Critical patent/JPS55156932A/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 maintain the illuinance of the radiated part constant by controlling the electric current an exposure lamp by the information relating to scanning such as scanning position or optical path length. CONSTITUTION:The quantity of light from an exposure lamp 11 is detected in a photo detecting part 15 and the output thereof is subjected to A/D conversion 21 and is stored in a RAM by a muCPU. Thence, the muCPU compares the content of the RAM with the assigned quantity of light and applies the instruction signal corresponding to the result of comparison to a control circuit 16. The control circuit 16 with the said instruction signal as a reference value controls the electric current of an exposure lamp 11. When a rotary mirror begins to rotate, the muCPU takes in the rotating position data from a rotating position detecting part 14 and operates the quantity of light of the lamp 11 of that time by the relations of the rotating angle of the mirror 12, the distance from the lamp 11 up to the radiated part 13, the electric current of the lamp 11 and the illuminance of the radiated part 13 so that the illuminance of the radiated part 13 becomes desired thereof, the illuminance of the radiated part 13 may be maintained constant.
JP6463479A 1979-05-25 1979-05-25 Exposure control system Pending JPS55156932A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6463479A JPS55156932A (en) 1979-05-25 1979-05-25 Exposure control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6463479A JPS55156932A (en) 1979-05-25 1979-05-25 Exposure control system

Publications (1)

Publication Number Publication Date
JPS55156932A true JPS55156932A (en) 1980-12-06

Family

ID=13263888

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6463479A Pending JPS55156932A (en) 1979-05-25 1979-05-25 Exposure control system

Country Status (1)

Country Link
JP (1) JPS55156932A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5182630A (en) * 1975-01-16 1976-07-20 Minolta Camera Kk
JPS53126924A (en) * 1977-04-11 1978-11-06 Ricoh Co Ltd Control method for original document illumination of slit exposure copier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5182630A (en) * 1975-01-16 1976-07-20 Minolta Camera Kk
JPS53126924A (en) * 1977-04-11 1978-11-06 Ricoh Co Ltd Control method for original document illumination of slit exposure copier

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