Patent ID: 8461025
Filing Date: 2013-06-11
Classification: H01L

Abstract:
1. A protective film forming method for forming a protective film of resin on the front side of a wafer to be laser-processed, comprising: a wafer holding step of holding said wafer on a spinner table in the condition where the front side of said wafer is oriented upward; a water layer forming step of forming a water layer covering the front side of said wafer held on said spinner table, wherein the water layer formed during the water layer forming step has a thickness of between about 1 mm and about 3 mm; a first liquid resin dropping step of dropping a liquid resin onto said water layer at the center of said wafer; and a first resin film forming step of rotating said spinner table to rotate said wafer held on said spinner table, thereby scattering said water layer and radially spreading said liquid resin dropped on said water layer to form a first resin film covering the front side of said wafer by a centrifugal force produced during rotation of said wafer.