JPS5753745A - Automatic exposure controller - Google Patents

Automatic exposure controller

Info

Publication number
JPS5753745A
JPS5753745A JP12946380A JP12946380A JPS5753745A JP S5753745 A JPS5753745 A JP S5753745A JP 12946380 A JP12946380 A JP 12946380A JP 12946380 A JP12946380 A JP 12946380A JP S5753745 A JPS5753745 A JP S5753745A
Authority
JP
Japan
Prior art keywords
density
amplifier
light
multiplier phototube
integrator
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
JP12946380A
Other languages
Japanese (ja)
Inventor
Kenji Takechi
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
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP12946380A priority Critical patent/JPS5753745A/en
Publication of JPS5753745A publication Critical patent/JPS5753745A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/26—Measuring, controlling or protecting
    • H05G1/30—Controlling
    • H05G1/38—Exposure time
    • H05G1/42—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube
    • H05G1/44—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube in which the switching instant is determined by measuring the amount of radiation directly

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exposure Control For Cameras (AREA)
  • Radiography Using Non-Light Waves (AREA)

Abstract

PURPOSE:To control exposure time when density on an X-ray film has a proper level, by optically converting X rays, incident to a light-electron multiplier phototube after pentrating an object, by the multiplier phototube during photographic operation and by converting a light output into an electric signal. CONSTITUTION:Between an amplifier 7 and an integrator 8, an II (light-electron multiplier phototube) lighting field switching corrector 14 which exercises bias control over an II controller 4 according to the output of the amplifier 7 is provided. Then, X rays after being transmitted through an object 2 enters an II3, which performs optical conversion. An optical image is inputted to a photomultiplier 6 via a prism 5 to be converted into an electric signal, which is amplified by the amplifier and then the corrector 14 corrects the signal level, thereby integrating the resulting signal by the integrator 8. Its integral value is compared with the reference voltage of a density setter by a comparator 10, which when the both are equal, stops X-ray exposure. Consequently, X-ray film density is controlled depending upon reference density 9.
JP12946380A 1980-09-18 1980-09-18 Automatic exposure controller Pending JPS5753745A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12946380A JPS5753745A (en) 1980-09-18 1980-09-18 Automatic exposure controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12946380A JPS5753745A (en) 1980-09-18 1980-09-18 Automatic exposure controller

Publications (1)

Publication Number Publication Date
JPS5753745A true JPS5753745A (en) 1982-03-30

Family

ID=15010111

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12946380A Pending JPS5753745A (en) 1980-09-18 1980-09-18 Automatic exposure controller

Country Status (1)

Country Link
JP (1) JPS5753745A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5418831A (en) * 1992-07-17 1995-05-23 U.S. Philips Corporation X-ray examination apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5418831A (en) * 1992-07-17 1995-05-23 U.S. Philips Corporation X-ray examination apparatus

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