Patent ID: 6458208
Filing Date: 2002-10-01
Classification: B01D,B05D,G03F,H01L,Y10S

Abstract:
A film forming apparatus comprising;a spin chuck that holds and rotates a rectangular substrate about a rotation center portion; a cup having an upper opening that allows the rectangular substrate to pass therethrough, the cup surrounding the rectangular substrate held by the spin chuck; a lid attachable to and detachable from the cup to close and open the upper opening thereof; a first circular/tubular nozzle having a single discharge port for supplying a resist solution to a first portion corresponding to the rotation center portion of the rectangular substrate held by the spin chuck; a plurality of second circular/tubular nozzles that supply the resist solution to a plurality of second portions of the rectangular substrate to which supply of the resist solution by centrifugal force is difficult, and supplement a shortage of the resist solution supplied by the first circular/tubular nozzle, each of said second nozzles having a single discharge port for supplying the resist solution to one of the plurality of second portions, and distances between the rotation center portion and each of the second portions being greater than a half of a shorter side of the rectangular substrate; a rectangular nozzle holder that holds the first nozzle and the second nozzles such that distances between the first nozzle and each of the second nozzles are greater than half of the shorter side of the rectangular substrate and the plurality of second nozzles are respectively situated near corners of the rectangular nozzle holder; a mechanism that positions the nozzle holder with respect to the spin chuck to position the first nozzle above the first portion of the rectangular substrate held by the spin chuck, and also to position the second nozzles respectively above the second portions of the rectangular substrate; a controller that controls an amount of the resist solution supplied from the first nozzle to the first portion and an amount of the resist solution supplied from the second nozzles to each of the second portions, attaches the lid to the cup, and rotates the rectangular substrate with the spin chuck; a resist solution tank; a supply tube provided between the resist solution tank and the first and second nozzles; a bellows pump provided in the supply tube and controlled by the controller for supplying the resist solution to the first and second nozzles; and an air operation valve provided in the supply tube and controlled by, the controller for passing or stopping the resist solution in the supply tube, wherein the resist solutions supplied by the first nozzle are diffused by centrifugal force, and the resist solutions are supplied to each of the second portions of the rectangular substrate, thereby combining the resist solution supplied by the first nozzle and the resist solution supplied by each of the second nozzles.