Patent ID: 11906299
Assignee: EBARA CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC G  C | IPC C  G

Claim 3:
4. A film thickness measuring method for substrate using a plating apparatus, wherein the plating apparatus includes:
a plating tank configured to store a plating solution and internally including an anode;
a substrate holder disposed above the anode and configured to hold a substrate as a cathode;
a rotation mechanism configured such that the rotation mechanism rotates the substrate holder when performing a plating process on the substrate;
a plurality of contact members disposed in the substrate holder and arranged in a circumferential direction of the substrate holder, the plurality of contact members being configured to contact an outer peripheral edge of a lower surface of the substrate to supply electricity to the substrate in the plating process; and
a coil configured to generate a current by an electromagnetic induction due to a magnetic field caused by a current flowing into a contact member of the plurality of contact members, the plurality of contact members being configured to rotate together with the substrate holder in the plating process, wherein
the film thickness measuring method comprises:
detecting the current generated in the coil in the plating process; and
measuring a film thickness of the substrate based on the detected current.