| 摘要 |
PURPOSE: A controlling method of a wire tail of a wire bonder is provided to improve a quality and a productivity by effectively controlling the wire tail. CONSTITUTION: A wire bonder state is initialized in a start step(200). A tool of the wire bonder is aligned to the upper direction about die pads in an alignment step(201). A ball is connected to the die pad in a pad bonding step(202). A wire is withdrawn from the edge of the tool to form a loop in a looping step(203). The contact of the tool on the lead frame is detected by a contact sensor in a contact detecting step(204). The wire is connected to the lead frame in a stitching step(205). A value of 'T-S>D' is judged by a controlling part in a judgment step(206). The capital 'T' means a contact level detected by the tool on the upper part of the lead frame and the capital 'S' means a contact level when the lower part of the lead frame is well contacted on a heat block. The capital 'D' is a parameter. When the value of 'T-S>D' is false, the tool is quickly lifted in a high-speed lift control step(207). When the value of 'T-S>D' is true, the tool is slowly lifted in a low-speed lift control step(208). A wire tail is formed at the edge of the tool in a tail formation step(209). A ball is formed on the wire tail by a torch blade in a ball formation step(210). The completion of the wire bonding work is judged in another judgement step(211). |
