Patent ID: 6960540

Claim:
A method of forming a solution film on an in-process substrate by using a dropping section for dropping liquid and the in-process substrate just under said dropping section, maintaining the liquid dropped from said dropping section on said in-process substrate, and relatively moving said in-process substrate or said dropping section, wherein relative movement between said in-process substrate and said dropping section comprises rotating said in-process substrate and relatively moving said dropping section from an inner periphery of said in-process substrate toward an outer periphery of said in-process substrate for spirally dropping said liquid on said in-process substrate so that the move pitch of the dropping unit in the radial direction occurring in every revolution of the in-process substrate is fixed; a rotational frequency w for said substrate is decreased so that the liquid dropped from said dropping section on said in-process substrate stays at a dropped position in accordance with relative movement of said dropping section from the inner periphery of said in-process substrate toward the outer periphery; and a feed rate v for said liquid from said dropping section is increased in accordance with relative movement of said dropping section from the inner periphery of said in-process substrate towards the outer periphery.