JPS54155709A - Corrector for quantity of light for photoelectric conversion - Google Patents

Corrector for quantity of light for photoelectric conversion

Info

Publication number
JPS54155709A
JPS54155709A JP6379078A JP6379078A JPS54155709A JP S54155709 A JPS54155709 A JP S54155709A JP 6379078 A JP6379078 A JP 6379078A JP 6379078 A JP6379078 A JP 6379078A JP S54155709 A JPS54155709 A JP S54155709A
Authority
JP
Japan
Prior art keywords
light
photoelectric conversion
original
peak value
power voltage
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.)
Granted
Application number
JP6379078A
Other languages
Japanese (ja)
Other versions
JPS6253984B2 (en
Inventor
Saburo Sasaki
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.)
Tohoku Ricoh Co Ltd
Ricoh Co Ltd
Original Assignee
Tohoku Ricoh Co Ltd
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 Tohoku Ricoh Co Ltd, Ricoh Co Ltd filed Critical Tohoku Ricoh Co Ltd
Priority to JP6379078A priority Critical patent/JPS54155709A/en
Publication of JPS54155709A publication Critical patent/JPS54155709A/en
Publication of JPS6253984B2 publication Critical patent/JPS6253984B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Preparing Plates And Mask In Photomechanical Process (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE: To make it possible to obtain the constant quality of photoengraving by keeping a photoelectric conversion peak value invariably constant by enabling a photo-current control circuit to attain the individual or interlocking control of the power voltage of a light source.
CONSTITUTION: The beams of light from light sources 4 and 4' are reflected by original 1 and led to photoelectric converting element 7, which generates an electric signal proportional to the light and shade of the picture element of original 1. For the purpose, element 7 is used whose photoelectric conversion rate depends upon the power voltage, and photo-current control circuit 15 is provided which compares the photoelectric conversion peak value where the reflection factor of the original is the highest to the reference voltage; this circuit 15 performs the individual or interlocking control of the power voltage of element 7 and power voltages of light sources 4 and 4', thereby keeping the photoelectric conversion peak value invariably constant. Consequently, the variation of the quantity of light from original 1 is suppressed to obtain the constant quality of photoengraving.
COPYRIGHT: (C)1979,JPO&Japio
JP6379078A 1978-05-30 1978-05-30 Corrector for quantity of light for photoelectric conversion Granted JPS54155709A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6379078A JPS54155709A (en) 1978-05-30 1978-05-30 Corrector for quantity of light for photoelectric conversion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6379078A JPS54155709A (en) 1978-05-30 1978-05-30 Corrector for quantity of light for photoelectric conversion

Publications (2)

Publication Number Publication Date
JPS54155709A true JPS54155709A (en) 1979-12-08
JPS6253984B2 JPS6253984B2 (en) 1987-11-12

Family

ID=13239517

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6379078A Granted JPS54155709A (en) 1978-05-30 1978-05-30 Corrector for quantity of light for photoelectric conversion

Country Status (1)

Country Link
JP (1) JPS54155709A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56147276A (en) * 1980-04-15 1981-11-16 Ricoh Co Ltd Manual subscanning type reader
JPS571956A (en) * 1980-06-04 1982-01-07 Fuji Photo Film Co Ltd Setting device for gain in reading radiation picture information

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4847213U (en) * 1971-10-05 1973-06-21

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4847213U (en) * 1971-10-05 1973-06-21

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56147276A (en) * 1980-04-15 1981-11-16 Ricoh Co Ltd Manual subscanning type reader
JPS571956A (en) * 1980-06-04 1982-01-07 Fuji Photo Film Co Ltd Setting device for gain in reading radiation picture information

Also Published As

Publication number Publication date
JPS6253984B2 (en) 1987-11-12

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