Liquid processing method and storage medium

1. A liquid processing method comprising:

accommodating a substrate horizontally in each of a first processing region and a second processing region, arranged in a left-right direction, for performing therein a process on the substrate by a processing solution from a nozzle;

rotating a rotary body, positioned at a rear side of an arrangement of the first and the second processing regions, about a vertical axis;

keeping a plurality of processing nozzles provided on the rotary body in a standby state at an outside of the first processing region and the second processing region such that the plurality of processing nozzles rotate with the rotary body;

supplying different kinds of processing solutions to the substrate from the plurality of processing nozzles;

holding a processing nozzle selected from the plurality of processing nozzles by a nozzle holder capable of being moved back and forth such that a nozzle transfer device, provided on the rotary body and having the nozzle holder, rotates with the rotary body and the plurality of processing nozzles;

transferring the nozzle holder into selected one of the first and the second processing regions by the nozzle transfer device;

rotating the rotary body by a rotation driving unit so as to allow a front of the nozzle holder in a forward/backward direction thereof to face the selected one of the first and the second processing regions,

wherein at least one hole is formed at a side periphery of the nozzle holder, at least one protruding member is provided in the at least one hole, an inner space formed within the nozzle holder is connected with an air supply source, and the inner space is surrounded by the at least one protruding member and a bottom member of the nozzle holder, and

an upwardly opened recess is provided at each of the plurality of processing nozzles, and at least one groove is formed at an inner side surface of the recess;

inserting the nozzle holder into the recess; and

engaging the at least one protruding member protruded from the nozzle holder in the at least one groove depending on an internal pressure of the inner space that is caused by a gas supplied from the air supply source.

2. The liquid processing method of claim 1 , wherein each of the first processing region and the second processing regions is provided in a cup having a top opening, and

the liquid processing method further comprises:

moving the nozzle holder holding the processing nozzle to an outer periphery of the top opening of the cup until the substrate is transferred into the cup;

stopping the nozzle holder at the outer periphery of the top opening of the cup; and

moving the nozzle holder to above the substrate after the substrate is transferred into the cup.

3. The liquid processing method of claim 2 , wherein the plurality of processing nozzles are arranged in a direction orthogonal to the forward/backward direction of the nozzle holder, and

the liquid processing method further comprises:

moving the nozzle holder in an arrangement direction of the plurality of processing nozzles;

holding a processing nozzle by the nozzle holder;

rotating the rotary body so as to allow a front of the nozzle holder in the forward/backward direction thereof to face the first processing region or the second processing region; and

moving the nozzle holder holding the processing nozzle into the first processing region or the second processing region.

4. The liquid processing method of claim 1 , wherein the plurality of processing nozzles are arranged in a direction orthogonal to the forward/backward direction of the nozzle holder, and

the liquid processing method further comprises:

moving the nozzle holder in an arrangement direction of the plurality of processing nozzles;

holding a processing nozzle by the nozzle holder;

rotating the rotary body so as to allow a front of the nozzle holder in the forward/backward direction thereof to face the first processing region or the second processing region; and

moving the nozzle holder holding the processing nozzle into the first processing region or the second processing region.

5. A non-transitory computer-readable storage medium having stored thereon computer-executable instructions that, in response to execution, cause a liquid processing apparatus to perform a liquid processing method as claimed in claim 1 .