Patent ID: 7508918

Claim:
A collimator for adjusting an X-ray beam, comprising: an up-and-down adjustment mechanism; a left-and-right adjustment mechanism; a supporting member with upper and lower wall surfaces, upper and lower sliding stops, left and right wall surfaces, and left and right sliding stops; and an adjusting plate connected with the supporting member, wherein: the up-and-down adjustment mechanism comprises upper and lower first rotating nuts, upper and lower moving leading screws each threadedly connected with a respective one of the first rotating nuts, and first upper and lower limiting gland covers, wherein each of the moving leading screws is connected with a respective one of the upper and lower sliding stops to drive the upper and lower sliding stops, respectively, to vertically move, and the first upper and lower limiting gland covers are each fixed to a respective one of the upper and lower wall surfaces and confine the respective first rotating nuts to rotate within the respective first limiting gland covers; and the left-and-right adjustment mechanism comprises left and right second rotating nuts, and left and right horizontally moving leading screws each connected with a respective one of the second rotating nuts, wherein each of the horizontally moving leading screws is connected with a respective one of the left and right sliding stops to drive the left and right sliding stops, respectively, to horizontally move.