Patent ID: 6435955
Filing Date: 2002-08-20
Classification: B24B,H01L

Abstract:
An abrasive machine, comprising:a holding unit for holding a work piece; and an abrasive plate having an abrasive face, which abrades a surface of the work piece by relatively moving said abrasive plate with respect to said holding unit, wherein said holding unit includes: an inner head having a first concave section, whose opening section is headed toward the abrasive face of said abrasive plate; an outer head having a second concave section, in which said inner head is provided and whose opening section is headed toward the abrasive face of said abrasive plate, a holding plate being provided in the first concave section and having a holding face, on which the work piece is held; an elastic holding member being fixed to said inner head and said holding plate, allowing said holding plate to move with respect to said inner head, and forming a first chamber for pressing the work piece in the first concave section with said holding plate; an outer enclosing member being provided to said outer head and enclosing said inner head; an inner enclosing member being provided between said outer enclosing member and said inner head and enclosing said inner head; a pressing member for pressing the abrasive face of said abrasive plate, said pressing member being formed into a ring shape enclosing said holding plate; an elastic ring member being fixed to said outer enclosing member and said inner enclosing member, holding and allowing said pressing member to move with respect to said outer head, and forming a second chamber in the second concave section; and a pressurizing unit introducing pressurized fluid into said first chamber and said second chamber so as to press the work piece onto the abrasive face of said abrasive plate with said holding plate and so as to press said pressing member onto the abrasive face of said abrasive plate.