Wafer pre aligner - A crucial part of the wafer transmitting system

1. Wafer pre aligners are a very vital component in the manufacturing of wafers. It positions the wafers precisely before they are actually transferred onto the exposure platform. The positioning precision highly affects the exposure accuracy of the wafer and efficiency of the work in the whole manufacturing system. These cs are used to accurately place the silicon wafers before photo-etching. As the precision requirement of machining is more than that of transportation of wafer, there is the need to position the wafers with wafer-pre aligner to balance the position error produced during the transportation. Due to the improvement of the manufacturing system of the wafer, it demands greater accuracy and speedy alignment of the wafer-pre aligner system. Kensington automation offers high-speed type, non-contact type, a built-in controller, compact design, and provides one-chuck system wafer pre-aligners that are ready to meet the various client demands for the exterior colors and materials. It supports various sizes of the wafers nearly up to 12 inches and it also corresponds to the chipping inspection.

2. The pre-aligners are classified into two different types namely mechanical and optical. In the mechanical type, it utilizes the mechanical structure to place the center of wafers, and its precision is too low to meet the high accuracy demands of today. On the other hand, the optical type is highly used in the pre-alignment of the wafers as it offers great position accuracy and satisfies the high precision requirements. As the optical type uses optical sensors as well as mechanical structure to meet the high accuracy position of a wafer that’s why it provides greater precision.