Patent ID: 7259380

Claim:
A scanning mechanism of an ion implanter, comprising: a first subchain and a second subchain, for driving the wafer holder ( 23 ) to scan and adjusting the rotational angle of the wafer holder ( 23 ); wherein the first subchain is of PR type, comprising a first prismatic pair ( 21 ) and a first revolute pair ( 22 ); the first prismatic pair ( 21 ) comprising a first fixing link ( 29 ) and a first moving link ( 30 ); one end of the first moving link ( 30 ) being connected to the wafer holder via the first revolute pair ( 22 ); the first fixing link ( 29 ) is connected rigidly to a wall ( 28 ) of the chamber of the ion implanter, the first moving link ( 30 ) capable of moving repeatedly along its axis relative to the first fixing link ( 29 ), thus bringing the wafer holder to move; the second subchain is of PRP type, comprising a second prismatic pair ( 24 ), a second revolute pair ( 25 ), a third revolute pair ( 26 ) and a third moving link ( 31 ); the second prismatic pair ( 24 ) comprising a second fixing link ( 33 ) and a second moving link ( 32 ); the second moving link ( 32 ) being connected to one end of the third moving link ( 31 ) via the second revolute pair ( 25 ), the other end of the third moving link ( 31 ) being connected to the wafer holder via the third revolute pair ( 23 ); the second fixing link ( 33 ) is connected rigidly to the chamber wall ( 28 ) of the ion implanter, the second moving link ( 32 ) capable of moving repeatedly along its axis relative to the second fixing link ( 33 ), thus bringing the wafer holder to move; the first revolute pair ( 22 ) and the third revolute pair ( 26 ) are connected to the wafer holder at different positions of the wafer holder; when the implant angle is adjusted, the first moving link ( 30 ) and the second moving link ( 32 ) have different translation amounts in the same direction or opposite directions; and when scan is performed, the first moving link ( 30 ) and the second moving link ( 32 ) move repeatedly in the same direction at the same speed.