Patent ID: 8633441
Filing Date: 2014-01-21
Classification: H01L

Abstract:
1. A method of inspecting an alignment of a die relative to a substrate onto which it is placed during a die bonding process, the method comprising the steps of: positioning the die such that a first side of the die which has a circuit pattern formed on it is facing away from an infrared light source, a portion of the first side of the die being covered by the circuit pattern; projecting infrared light from the infrared light source onto a second side of the die opposite to the first side such that the infrared light passes through a body of the die; from the second side of the die, detecting and capturing one or more images of the infrared light reflected from the circuit pattern and from predetermined patterns on the substrate; and thereafter determining an alignment of the die relative to the substrate by comparing the one or more captured images of the infrared light reflected from the circuit pattern with the one or more captured images of the infrared light reflected from the predetermined patterns on the substrate on which the die is placed, and calculating an offset between the die and the substrate.