Patent ID: 9649655
Date: 2017-05-16
CPC Classifications: B05B,B05C

Claim:
1. A coating apparatus comprising: a slit nozzle including an elongated main body fixed to a fixing member, a storage tank having a first wall and a second wall facing with each other and configured to store a coating liquid within the main body, and a slit-shaped ejecting port configured to eject the coating liquid fed from the storage tank through a slit-shaped flow path to an upper surface of a substrate, at least a part of each of the first wall and the second wall being formed of a transparent member and at least two reference portions being formed on a surface of the second wall; a moving mechanism including a substrate holding unit formed with a suction port configured to hold the substrate in a horizontal direction and a driving unit including a first motor configured to move the substrate holding unit in a horizontal direction with respect to the slit nozzle; an elevating mechanism extending in a vertical direction and including a second motor configured to move the slit nozzle fixed to the fixing member in the vertical direction; a first light source fixed to the fixing member to be positioned at a side of the first wall of the storage tank, and configured to irradiate light toward an inside of the storage tank through the transparent member of the first wall; a second light source fixed to the fixing member to be positioned at a side of the second wall of the storage tank, and configured to irradiate light toward the surface of the second wall where the at least two reference portions are formed; a camera fixed to the fixing member to be positioned at the side of the second wall of the storage tank and configured to capture either one of an image of the inside of the storage tank through the transparent member of the second wall or an image of the surface of the second wall where the reference portions are formed; and a controller configured to control an overall operation of the coating apparatus including the slit nozzle, the moving mechanism, the elevating mechanism, the first light source, the second light source, and the camera, wherein the controller is configured to: