Patent ID: 11961757
Assignee: SCREEN HOLDINGS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A substrate processing apparatus comprising:
a substrate holder; and
a tubular cup surrounding said substrate holder; wherein
said substrate holder including:
a holder holding a substrate in a horizontal attitude, and having a base member which has a first upper surface opposed in spaced apart relation to a back surface of the substrate and pins which protrude from said first upper surface and arranged in spaced apart relation along a peripheral edge of said substrate;
a ring member in a shape of a ring surrounding the peripheral edge of the substrate held by said holder of the substrate holder as seen in plan view, said ring member located between said holder of the substrate holder and said cup, said ring member having a second upper surface positioned below a front surface of said substrate an inner peripheral surface extending vertically down below from an inner peripheral edge of said second upper surface, and an outer peripheral surface extending vertically down below from an outer peripheral edge of said second upper surface and opposed in spaced apart relation to an inner peripheral surface of said cup; and
a rotation mechanism including a motor, said rotation mechanism rotating said holder of the substrate holder and said ring member about a rotation axis at rotation speeds different from each other and/or in rotational directions different from each other, said rotation axis being a vertical axis passing through the substrate held by said holder of the substrate holder,
wherein, the second upper surface of said ring member is located below said front surface of said substrate and above the first upper surface of said base member, and
said ring member and said cup are spaced apart from each other.