JPS5487112A - Crt luminance control system - Google Patents

Crt luminance control system

Info

Publication number
JPS5487112A
JPS5487112A JP15512277A JP15512277A JPS5487112A JP S5487112 A JPS5487112 A JP S5487112A JP 15512277 A JP15512277 A JP 15512277A JP 15512277 A JP15512277 A JP 15512277A JP S5487112 A JPS5487112 A JP S5487112A
Authority
JP
Japan
Prior art keywords
voltage
luminance
correction
control system
luminance control
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
JP15512277A
Other languages
Japanese (ja)
Other versions
JPS5832381B2 (en
Inventor
Kenji Kono
Masao Akiyoshi
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP52155122A priority Critical patent/JPS5832381B2/en
Publication of JPS5487112A publication Critical patent/JPS5487112A/en
Publication of JPS5832381B2 publication Critical patent/JPS5832381B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Projection-Type Copiers In General (AREA)
  • Television Receiver Circuits (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

PURPOSE: To prevent the variation in the print darkness in an electronic photography unit, by stabilizing the luminance through the correction automatically for detecting the variation in the luminance of CRT.
CONSTITUTION: The output voltage from the photo detection element 2 detecting the luminance of CRT1 and the reference voltage are compared 5, the correction voltage gradually increasing or decreasing based on the result of comparison is produced 8, and the luminance correction 4 is made by adding the correction voltage to the luminance voltage. Further, the correction voltage is generated so that the output voltage from the photo detection element 2 and the reference voltage can almost be in agreement with each other.
COPYRIGHT: (C)1979,JPO&Japio
JP52155122A 1977-12-23 1977-12-23 CRT brightness control method Expired JPS5832381B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52155122A JPS5832381B2 (en) 1977-12-23 1977-12-23 CRT brightness control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52155122A JPS5832381B2 (en) 1977-12-23 1977-12-23 CRT brightness control method

Publications (2)

Publication Number Publication Date
JPS5487112A true JPS5487112A (en) 1979-07-11
JPS5832381B2 JPS5832381B2 (en) 1983-07-12

Family

ID=15599038

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52155122A Expired JPS5832381B2 (en) 1977-12-23 1977-12-23 CRT brightness control method

Country Status (1)

Country Link
JP (1) JPS5832381B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5831587U (en) * 1981-08-26 1983-03-01 横河電機株式会社 CRT display device
JPS6139688A (en) * 1984-07-30 1986-02-25 Tokyo Denshi Kogyo Kk Cathode-ray tube controller and information collection device therefor
JPS63125932A (en) * 1986-09-15 1988-05-30 ゼネラル・エレクトリック・カンパニイ Method and apparatus for equalizing video image and film image

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5831587U (en) * 1981-08-26 1983-03-01 横河電機株式会社 CRT display device
JPS6139688A (en) * 1984-07-30 1986-02-25 Tokyo Denshi Kogyo Kk Cathode-ray tube controller and information collection device therefor
JPH0313589B2 (en) * 1984-07-30 1991-02-22 Tokyo Electronic Ind Co
JPS63125932A (en) * 1986-09-15 1988-05-30 ゼネラル・エレクトリック・カンパニイ Method and apparatus for equalizing video image and film image

Also Published As

Publication number Publication date
JPS5832381B2 (en) 1983-07-12

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