JPS6477035A - Automatic illuminance adjusting system - Google Patents

Automatic illuminance adjusting system

Info

Publication number
JPS6477035A
JPS6477035A JP23381587A JP23381587A JPS6477035A JP S6477035 A JPS6477035 A JP S6477035A JP 23381587 A JP23381587 A JP 23381587A JP 23381587 A JP23381587 A JP 23381587A JP S6477035 A JPS6477035 A JP S6477035A
Authority
JP
Japan
Prior art keywords
distance
constant
square
light source
output adjustment
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
JP23381587A
Other languages
Japanese (ja)
Inventor
Masahiro Ozawa
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP23381587A priority Critical patent/JPS6477035A/en
Publication of JPS6477035A publication Critical patent/JPS6477035A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To keep the illuminance of an object to be radiated at the time of initializing constant even if a distance between a light source and the object is changed by adjusting radiation flux according to ratio of the square of the distance between the object and the light source and the square of the distance between the object at the time of initializing and the light source. CONSTITUTION:If a distance constant 7 obtained by measuring in a distance measuring means 3 gets different from the value of an initial distance constant 10 because the object 1 moves, the value obtained by dividing the square of the distance constant 7 by the square of the initial distance constant 10 by an output adjustment constant calculation means 6 does not become '1'. Moreover, if the above-mentioned value is multiplied by an initial output adjustment constant 8, an output adjustment constant 11 becomes a value different from that at the time of initializing, so that a light emission means 2 changes the size of the radiation flux 12 according to the newly set output adjustment constant 11. Thus, the illuminance of the object can be kept constant even if the distance between the object and the light source is changed.
JP23381587A 1987-09-18 1987-09-18 Automatic illuminance adjusting system Pending JPS6477035A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23381587A JPS6477035A (en) 1987-09-18 1987-09-18 Automatic illuminance adjusting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23381587A JPS6477035A (en) 1987-09-18 1987-09-18 Automatic illuminance adjusting system

Publications (1)

Publication Number Publication Date
JPS6477035A true JPS6477035A (en) 1989-03-23

Family

ID=16961010

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23381587A Pending JPS6477035A (en) 1987-09-18 1987-09-18 Automatic illuminance adjusting system

Country Status (1)

Country Link
JP (1) JPS6477035A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2790561A1 (en) * 1999-03-04 2000-09-08 Ge Medical Syst Sa METHOD OF CONTROLLING EXPOSURE IN RADIOLOGICAL IMAGING SYSTEMS
WO2003048806A1 (en) * 2001-12-05 2003-06-12 Koninklijke Philips Electronics N.V. Method to measure the entrance dose of a radiology apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2790561A1 (en) * 1999-03-04 2000-09-08 Ge Medical Syst Sa METHOD OF CONTROLLING EXPOSURE IN RADIOLOGICAL IMAGING SYSTEMS
US7194065B1 (en) 1999-03-04 2007-03-20 Ge Medical Systems Sa Method and apparatus for control of exposure in radiological imaging systems
WO2003048806A1 (en) * 2001-12-05 2003-06-12 Koninklijke Philips Electronics N.V. Method to measure the entrance dose of a radiology apparatus

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