| 摘要 |
PURPOSE:To enable mounting of a collimator with high safety by providing a positioning pin to a detector, providing a positioning hole on the collimator side and fitting the pin into said hole. CONSTITUTION:Plural pieces of fixing pins 1 are disposed to the peripheral edges of a detector and one pin 5 for positioning is disposed to the peripheral edge. If a collimator is placed near the mounting surface of the detector in such a way that the head parts 1A of the pins 1 enter hole parts 4A, springs 7 are shrunk by the own weight of the collimator and the bevel body 5B of the pin 5 is sunk under the mounting surface at the peripheral edge of the detector. When the collimator is slid in a direction X, the top end of the pawl part 4C contacts the curved surface 1c of the boss part 1C and is pressed by the slope at the top end of the pawl part 4C. When the collimator is slid further, the part 4C enters the space between the head part 1A and the boss part 1C thereby depressing the part 1C. Clattering in a vertical direction is obviated by a spring 3 in this stage. The top surface of the bevel body 5B of the pin 5 mates with the position of a positioning hole 8 provided on the flange side of the collimator and the body 5B is inserted into the hole 8 by the recovering force of the spring 7. The position of the collimator with respect to the detector is thus determined.
|
