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Wafer holding device

  • US 6,108,190 A
  • Filed: 11/30/1998
  • Issued: 08/22/2000
  • Est. Priority Date: 12/01/1997
  • Status: Expired due to Term
First Claim
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1. A wafer holding device, comprising a wafer holding stage of ceramics having at least one internal electrode and a top surface on which at least a wafer is to be mounted, a base block supporting said stage integrated thereto, and a braze material layer to join the stage and the base block between which the layer is interposed, wherein the base block is formed of a porous ceramics and a metal filled in pores of a bulk of the ceramics, a thermal expansion coefficient of the base block is within 3×

  • 10-6

    C. of a thermal expansion coefficient of the stage, and the braze material layer comprises an aluminum-based braze material.

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