Automatic blackening degree adjustment system

Radiant energy – With charged particle beam deflection or focussing – With target means

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Details

250322, 250439P, 250355, H05G 132

Patent

active

043330126

ABSTRACT:
An automatic blackening degree adjustment system which includes the steps of making a fluorescent plate luminous by a residual dose of X-rays that have penetrated the person to be photographed and an X-ray film, converting the amount of luminescense into electric output, converting the relative feed speed of an X-ray film with respect to an X-ray beam into electric output and computing an electric output obtained from the conversion of amount of luminescense and the relative feed speed and feeding back a value obtained to a filament control circuit to thereby control the filament current of the X-ray machine whereby the tube voltage of the X-ray tube is kept constant so that the exposure is adjusted to an optimum amount with the X-ray wave length kept constant and resulting in X-ray photograph taken which have sufficient and uniform contrast in any part thereof.

REFERENCES:
patent: 2401289 (1946-05-01), Morgan et al.
patent: 2913582 (1959-11-01), Collins et al.
patent: 4063099 (1977-12-01), Grassme

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