ZERO ANGLE PERIMETER LIGHTING FOR INSPECTING BALL GRID ARRAY SOLDER SPHERES
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2002-Mar-22
The implementation of Ball Grid Array (BGA) sphere leaves a dark "hole" (see Figure 3 and 4). IC packages presents a machine vision challenge dur- This lighting technique lends itself well to full array ing packaging and placement of the part. Taking an and singulated part inspection. accurate count of the balls is critical at both the solder sphere attach process and the automated pick and place stage. In an effort to provide reliable inspec- Fla. 1 Fiber-oDtic Liaht Bar tion of BGA packages, this ze;o-angle lighting tech- nique was developed.