Patent ID: 8888563

Claim:
A polishing apparatus, comprising: a polishing head for holding a work; a polishing plate having a polishing face, on which a polishing pad is adhered; and a driving mechanism for relatively moving the polishing head with respect to the polishing plate, wherein the polishing head includes: a holding plate having a ring-shaped side wall and a supporting plate surrounded by the ring-shaped side wall; an elastic sheet member being fixed to an edge of the holding plate, the elastic sheet member having a lower face, which is capable of pressing the work onto the polishing pad of the polishing plate; a ring-shaped template being fixed to an outer edge part of the lower face of the elastic sheet member, the ring-shaped template surrounding the work so as to hold the work and prevent the work from jumping outside while polishing the work; a pressure chamber, to which a fluid at a prescribed pressure is supplied so as to press the elastic sheet member, being formed between a lower face of the holding plate and an upper face of the elastic sheet member; a seal ring, which is composed of rubber and which has a V-shaped section, having a main body part, which is fitted on the supporting plate, the seal ring sidelingly contacting the elastic sheet member so as to divide the pressure chamber into an inner chamber and an outer chamber; and a fluid supply section for individually supplying the fluid to the inner and outer chambers, which are divided by the seal ring.