Patent Number: 056087772
Section: claims

1. An absorption assembly for slit radiography apparatus including an X-ray source, a slit diaphragm and an X-ray detector wherein said absorption assembly is disposed between said X-ray source and said X-ray detector, which comprises: a plurality of piezoelectric tongues each having a fixed end and a free end including an absorption element;  stop means for limiting individually deflection of each of said piezoelectric tongues, said stop means being comprised of a first stop strip and a second stop strip disposed behind said first stop strip, a distance between said second stop strip and a rest position of said piezoelectric tongues being greater than a distance between said first stop strip and a rest position of said piezoelectric tongues. 2. The absorption assembly as defined in claim 1 wherein said stop strips are parallelly-disposed rib members. 3. The absorption assembly as defined in claim 1 wherein said stop strips are edges of stop elements in stepped configuration. 4. The absorption assembly as defined in claim 1 wherein stop means are positioned on either side of said plurality of piezoelectric tongues. 5. The absorption assembly as defined in claim 1 wherein stop means are asymmetrically positioned on either side of said plurality of piezoelectric tongues.