Patent ID: 9620394
Date: 2017-04-11
CPC Classifications: B05C,G03F,H01L

Claim:
1. A liquid treatment apparatus comprising: a substrate holding part having a circular shape and holding a substrate horizontally; a cup structure arranged around the substrate holding part; a rotating mechanism that rotates the substrate holding part to rotate the substrate held by the substrate holding part about a vertical axis; a treatment liquid nozzle that supplies a treatment liquid to a front surface of the substrate held by the substrate holding part; a cleaning liquid discharging arrangement that discharges a cleaning liquid for cleaning the cup structure and for cleaning a back surface of the substrate held by the substrate holding part, the cleaning liquid discharging arrangement having at least one nozzle; a cleaning member including an annular part formed in an annular shape extending along a circumferential direction of the cup structure and an opening positioned inside the annular part with respect to the radial direction of the cup structure; a support member connected to the cleaning member via a bearing such that the cleaning member is supported by the support member for free rotation relative to the support member about the vertical axis; an elevation mechanism that moves the support member up and down to move the cleaning member supported by the support member between a first position and a second position higher than the first position; and an engagement mechanism that engages the substrate holding part with the cleaning member at the second position so as to transmit rotational torque to the cleaning member such that the cleaning member rotates conjointly with the substrate holding part driven by the rotating mechanism, wherein the cleaning member positioned at the first position allows the cleaning liquid for cleaning the back surface of the substrate held by the substrate holding part discharged from the cleaning liquid discharging arrangement to reach the back surface of the substrate through the opening of the cleaning member, and the cleaning member positioned at the second position allows the cleaning liquid for cleaning the cup structure discharged from the cleaning liquid discharging arrangement to collide with the annular part of the cleaning member and to be guided to an inner surface of the cup structure.