The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 18, 1978
Filed:
Jan. 03, 1977
Tokyo Shibaura Electric Co., Ltd., Kawasaki, JP;
Abstract
An X-ray image intensifier photofluorography apparatus for correcting the output image brightness while photographing an optical image of a subject in an optical camera through a lens system by amplified light into which X-rays are converted after passing from an X-ray source through the subject to an X-ray image intensifier, wherein filter means whose X-ray permeability is represented by an axially asymmetric form relative to the central horizontal axis between the X-ray source and X-ray image intensifier to correct the distribution of the intensity of X-rays emitted from the X-ray source. The X-ray permeability of the filter means is adjusted by changing a length of X-ray path or the thickness of the filter means through which X-rays are transmitted. The thickness of the filter means is determined in consideration of the distribution of the intensity of X-rays emitted from the X-ray source and the distribution of brightness of each of light images from the X-ray image intensifier and from an optical lens system. Adjustment of the distribution of the X-ray intensity by the filter means enables the light image to be photographed with a suitable brightness corresponding to the X-ray permeability of the subject on a film received in the optical camera.