JPS56168399A - X-ray photographic equipment - Google Patents

X-ray photographic equipment

Info

Publication number
JPS56168399A
JPS56168399A JP7360980A JP7360980A JPS56168399A JP S56168399 A JPS56168399 A JP S56168399A JP 7360980 A JP7360980 A JP 7360980A JP 7360980 A JP7360980 A JP 7360980A JP S56168399 A JPS56168399 A JP S56168399A
Authority
JP
Japan
Prior art keywords
light
photodetectors
output
average value
circuit
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
JP7360980A
Other languages
Japanese (ja)
Inventor
Tatsuo Hashizume
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.)
Shimadzu Corp
Original Assignee
Shimadzu 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 Shimadzu Corp filed Critical Shimadzu Corp
Priority to JP7360980A priority Critical patent/JPS56168399A/en
Publication of JPS56168399A publication Critical patent/JPS56168399A/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

Abstract

PURPOSE:To ensure a proper exposure time even when there are abnormally light and dark places by arranging a number of photoelectric detectors which detects the brightness of a phosphor screen and driving a photo-timer depending upon the average value of these output. CONSTITUTION:An X-ray irradiated from an X-ray tube 3 passes through a subject 4, exposes a film 6, and is converted into light by an image tube 7 behind it. A part of the output of the image tube 7 is taken out by a mirror 8 and detected by a number of photodetectors which scatter. The photocurrent of these photodetectors enters a compare circuit 18 and is compared with the voltage from a voltage setting device 25 with a width which is assumed in a normal photographic condition. When there is an abnormally light (dark) place, switches 29 and 30 are opened. As a result, the average value of the outputs from the photodetectors which detect normal light is output from an average value circuit 34 and these outputs are integrated by an integration circuit 36. When this integration value exceeds a specified value, a high voltage generator 2 is stopped.
JP7360980A 1980-05-30 1980-05-30 X-ray photographic equipment Pending JPS56168399A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7360980A JPS56168399A (en) 1980-05-30 1980-05-30 X-ray photographic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7360980A JPS56168399A (en) 1980-05-30 1980-05-30 X-ray photographic equipment

Publications (1)

Publication Number Publication Date
JPS56168399A true JPS56168399A (en) 1981-12-24

Family

ID=13523239

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7360980A Pending JPS56168399A (en) 1980-05-30 1980-05-30 X-ray photographic equipment

Country Status (1)

Country Link
JP (1) JPS56168399A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57202100A (en) * 1981-06-04 1982-12-10 Hitachi Medical Corp X-ray automatic exposure detecting unit
JPS58160946A (en) * 1982-03-19 1983-09-24 Hitachi Medical Corp Automatic x-ray exposing device
FR2577374A1 (en) * 1985-02-08 1986-08-14 Thomson Cgr Method of automatic adjustment of exposure in a radiology installation and radiology installation implementing such a method
EP0435528A2 (en) * 1989-12-26 1991-07-03 General Electric Company X-ray system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57202100A (en) * 1981-06-04 1982-12-10 Hitachi Medical Corp X-ray automatic exposure detecting unit
JPH023279B2 (en) * 1981-06-04 1990-01-23 Hitachi Medical Corp
JPS58160946A (en) * 1982-03-19 1983-09-24 Hitachi Medical Corp Automatic x-ray exposing device
FR2577374A1 (en) * 1985-02-08 1986-08-14 Thomson Cgr Method of automatic adjustment of exposure in a radiology installation and radiology installation implementing such a method
EP0435528A2 (en) * 1989-12-26 1991-07-03 General Electric Company X-ray system

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