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    • 3. 发明申请
    • ELECTROSTATIC CHUCK DEVICE
    • US20210006182A1
    • 2021-01-07
    • US16954989
    • 2019-11-11
    • SUMITOMO OSAKA CEMENT CO., LTD.
    • Shinichi MAETA
    • H02N13/00H01L21/683
    • According to an electrostatic chuck device of the present invention, a cross-sectional shape of a base body in a thickness direction is a convex curved surface or a concave curved surface that gradually curves from a center of one main surface toward an outer periphery of the one main surface, an annular projection portion is provided on a peripheral portion on the one main surface of the base body so as to go around the peripheral portion, a plurality of convex projection portions are provided in a region surrounded by the annular projection portion, a difference between a height of a top surface of the convex projection portion positioned at a center of the one main surface and a height of an upper surface of the annular projection portion is 1 μm or higher and 30 μm or lower, the convex projection portion has the top surface in contact with the plate-shaped sample, a side surface, and an R surface continuously connecting the top surface and the side surface, and a ratio of a diameter of the top surface to a diameter of a bottom surface is 0.75 or higher, and an angle formed by the top surface and the side surface of the convex projection portion is 90° or higher and 160° or lower.