Patent ID: 8726828

Claim:
A coating apparatus having a coater chuck comprising: a driving shaft via a servo motor; a servo motor being movable up and down; and a coater chuck connected to the driving shaft by the servo motor, and on which a glass substrate being coated with a photoresist through a slit nozzle, being placed, wherein the coater chuck is formed by using one selected from a stone being granite, a material which is not easy to be thermally deformed and having a low thermal conductivity, a material having the hardness equal to or higher than glass, a non-magnetic material without electric conductivity, and a material having a corrosion resistance against acid, alkali and other organic compounds, wherein the coater chuck is more than 15mm in thickness to prevent sinking downwardly of the side portions of the coater chuck in performing a photoresist coating process and has a surface roughness in the range of ±30μm, wherein the servo motor has a capacity of 740 W larger than 400 W.