Substrate treating apparatus and substrate treatment method for discharging treatment solution from nozzle to substrate
An upper treatment solution nozzle discharges a treatment solution at a treatment position above a substrate. A reference image and a test image are cut out from an image captured after the upper treatment solution nozzle receives an instruction to start discharging the treatment solution. The test image is an image including an area of a surface of a substrate, in which a liquid flow of the treatment solution from the upper treatment solution nozzle is to be formed. The reference image is an image of an area of the surface of the substrate except for the area in which the liquid flow of the treatment solution from the upper treatment solution nozzle is to be formed. Through the comparison between the reference image and the test image, a discharge of the treatment solution from the upper treatment solution nozzle is determined.
1. A substrate treatment method for discharging a treatment solution to a substrate, said method comprising the steps of:
(a) holding a to-be-newly-treated substrate on a substrate holder;
(b) moving, after the to-be-newly-treated substrate is held on said substrate holder, a nozzle that discharges a treatment solution from a standby position outside a cup surrounding said substrate holder toward a treatment position above the substrate held on said substrate holder;
(c) imaging, after said nozzle receives an instruction to start discharging the treatment solution, an imaging area including an area in which a liquid flow is to be formed when said nozzle discharges the treatment solution at said treatment position;
(d) cutting out, from an image acquired in said step (c), a test image and a first reference image, said test image being an image including the area of the surface of the substrate held on the substrate holder in which said liquid flow is to be formed, said first reference image being an image of the surface of the substrate except for said area; and
(e) comparing said first reference image and said test image to determine a discharge of the treatment solution from said nozzle.
2. The substrate treatment method according to claim 1 , wherein
said step (c) images said imaging area a plurality of times after said nozzle receives an instruction to start discharging the treatment solution to acquire a plurality of images,
said step (d) cuts out said first reference image and said test image from each of said plurality of images, and
said step (e) compares said first reference image and said test image cut out in said step (d) for each of said plurality of images.
3. The substrate treatment method according to claim 1 , wherein
said step (d) further cuts out, from the image acquired in said step (c), a second reference image of an area of the surface of the substrate held on said substrate holder except for the area in which said liquid flow is to be formed, said second reference image differing from said first reference image, and
said step (e) compares said first reference image and said second reference image to determine the validity of the determination of a discharge of the treatment solution.