초록 ▼

A wedge device for a press for controllably exerting high amounts of force in a clamping operation during a semiconductor packaging process and for facilitating a linear force output in relation to its input. The wedge device is powered by a servo motor which is coupled to a planetary screw by a set

A wedge device for a press for controllably exerting high amounts of force in a clamping operation during a semiconductor packaging process and for facilitating a linear force output in relation to its input. The wedge device is powered by a servo motor which is coupled to a planetary screw by a set of pulleys and a timing belt. The screw is mated with a nut which is prevented from rotating so that the rotation of the screw causes the nut to move in a linear direction. Metal extensions join the nut to a bottom wedge such that the wedge moves together with the nut. Slidably disposed on top of the bottom wedge is a block bearing firmly attached to a complementary wedge. The complementary wedge is free to move in a vertical direction but not in a horizontal direction. As the bottom wedge moves in a horizontal direction, the complementary wedge moves in a vertical direction. The complementary wedge is placed underneath a press to provide the clamping force necessary for a semiconductor packaging operation.

대표청구항 ▼

[ We claim:] [1.] A method of facilitating a contamination-reduced semiconductor packaging operation on a semiconductor device comprising:providing a semiconductor moulding equipment having a top and bottom moulds in between top and bottom platens;placing the semiconductor device on the bottom mould

[ We claim:] [1.] A method of facilitating a contamination-reduced semiconductor packaging operation on a semiconductor device comprising:providing a semiconductor moulding equipment having a top and bottom moulds in between top and bottom platens;placing the semiconductor device on the bottom mould;exerting a clamping force onto said bottom platen using a wedge device, said wedge device comprising,a servo motor;a linear-conversion mechanism mechanically coupled to said servo motor for converting a rotational movement to a linear movement;a bottom wedge firmly attached to said linear-conversion mechanisms, said wedge having a top, a bottom, a wide end and a narrow end;a base located below said bottom wedge;a first friction-reducing mechanism disposed between said bottom wedge and said base,a block bearing slidably disposed on the top of said bottom wedge;a second friction-reducing mechanism disposed between said block bearing and bottom wedge;a complementary wedge firmly attached to said block bearing, said complementary wedge being disposed under said bottom platen;a guide mechanism for guiding said complementary wedge;performing a semiconductor encapsulation operation;whereby a horizontal movement of said bottom wedge causes said complementary wedge and said bottom platen to move in a substantially vertical direction to clamp said bottom mould and said top mould, wherein a clamping force between said bottom mould and top mould is substantially linearly proportional to a step displacement of said servo motor, said wedge device facilitating a reduction in contamination.