Patent ID: 6990226
Filing Date: 2006-01-24
Classification: H01L

Abstract:
1. A method for recognizing patterns, the method comprising: a lead frame orientation detecting step of setting a first lead eye box and a first lead eye point on a gate of a lead frame through an observation hole of a clamp with a camera and setting a second lead eye box and a second lead eye point on a support bar of the lead frame located on an outer circumference of the clamp, before clamping the lead frame seated on a heater block with the clamp, and determining whether or not the lead frame is seated in an exact first position; a lead frame indexing step of setting the first lead eye box and the first lead eye point on the gate and setting the second lead eye box and the second lead eye point on the support bar with the camera, after clamping the lead frame, and determining whether or not the lead frame is seated in the exact first position; a Video Lead Locate step of capturing positions of leads of the lead frame and memorizing the positions; and a die orientation detecting step of setting die eye boxes and die eye points on two specific areas of bond pads adjacent edges of a die and determining whether or not the die is mounted in an exact second position.