Lackenbach Siegel LLP
Apparatus for detecting the flatness of wafer and the method thereof
An apparatus for detecting the flatness of a top surface of a wafer includes a plurality of detector elements, a metal sink and a plurality of injection pipes. Each detector element comprises: a metal tube body, jet pipes, a light receiver and a light emitter. The method comprises: injecting ultra-pure water into the detector elements by injection pipes; emitting parallel beams along an upward-oblique direction, a preset Angle θ being formed between the beams and the vertical direction. The radiated beams above the water surface are incident on a receiver. The intensity of the beams received by the light receiver is used to calculate the height of the detecting point of the surface of the silicon wafer to determine the flatness condition of the wafer surface. The flatness of the photo-resist covered on the wafer surface can also be accurately measured by this method.
Shanghai Huali Microelectronics Corporation
B B G B G
B24B B24B G01B B24B G01B
inventional inventional inventional inventional inventional
WenLiang Jun LiJun HsuSheng
Li Zhu Chen Chang