Patent ID: 9233455
Filing Date: 2016-01-12
CPC Classification: B25B,H01L,Y10T

Claim Text:
1. A chucking method of a base portion having a plurality of protruding portions that support a semiconductor substrate that chucks a semiconductor substrate to suction holes provided in the protruding portions, the method comprising: providing a suction hole in at least one portion of the plurality of protruding portions; producing a vacuum at differing timings in the suction holes, the vacuum being produced in each suction hole independently of the other suction holes; and chucking the semiconductor substrate to the suction holes; wherein a surface of an interior side of a peripheral portion on a main surface side of the semiconductor substrate is chucked, the peripheral portion being left thickly around an outer perimeter and the main surface having a stepped form from the peripheral portion.