Patent ID: 7736918

Claim:
A photoresist coating apparatus comprising: a photoresist supply line through which photoresist is supplied; a fluid control valve connected to the photoresist supply line to control the flow of the photoresist; a nozzle assembly connected to the photoresist supply line at a rear end of the fluid control valve, the nozzle assembly including a nozzle located above the center of a semiconductor wafer loaded in a photoresist coating unit to spray the photoresist; a camera located outside the photoresist coating unit to monitor the shape or spraying amount of the nozzle located at the tip of the nozzle assembly; said camera comprising a light source for emitting incident light to the nozzle of the nozzle assembly, a lens for receiving reflection light reflected by the nozzle of the nozzle assembly, and a camera controller for monitoring the nozzle of the nozzle assembly using the received reflection light to output an electric signal to the controller; and a controller for converting data monitored by the camera into an electric signal and processing the electric signal, wherein the electric signal processed by the controller is fed back into the fluid control valve to control the flow of the photoresist sprayed via the nozzle of the nozzle assembly.