Drive for a scattered ray grid
The invention relates to a drive for a scattered ray grid (8) in which the scattered ray grid is moved starting with a high, progressively decreasing speed. When producing X-ray photographs, the scattered ray grid preferably attenuates the scattered rays by virtue of its shaft-like structure. In ord...
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Format: | Patent |
Sprache: | eng ; ger |
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Zusammenfassung: | The invention relates to a drive for a scattered ray grid (8) in which the scattered ray grid is moved starting with a high, progressively decreasing speed. When producing X-ray photographs, the scattered ray grid preferably attenuates the scattered rays by virtue of its shaft-like structure. In order to blur the structure of the scattered ray grid on the film, the scattered ray grid is moved at a variable speed during the taking of the photograph. For this purpose the invention provides for the free end of a lever (4) which can be rotated about a fulcrum (5) to be displaceable along a guide track (3) which can be rotated about a second centre of rotation (2) at an approximately constant speed and is coupled to the scattered ray grid. In addition, the distance between the fulcrum (5) and the centre of rotation (2) of the guide tack (3) can be smaller than the length of the lever (4) between its fulcrum (5) and its engagement point on the guide track. A drive according to the invention for a scattered ray grid is suitable in particular for medical and technical X-ray examination equipment. |
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