Patent ID: 7824843

Claim:
A pattern forming method, comprising the steps of: forming a mask layer having a dense hole pattern with a plurality of holes positioned densely, on a film as an object of processing, by a first positive photo-resist; solidifying said mask layer of said first positive photo-resist; forming a second positive photo-resist on said mask layer of said first positive photo-resist to fill each of said plurality of holes of said dense hole pattern; projecting and exposing an image of dark points to said second positive photo-resist at some of positions corresponding to said holes of said dense hole pattern using a half-tone phase shift mask having a virtual lattice matching each of said holes of said dense hole pattern; developing said exposed second positive photo-resist to leave a pattern of dots formed at portions of said image of dark points of said second positive photo-resist in any of said plurality of holes of the pattern of said mask layer; and patterning said film as the object of processing, using said mask layer and said pattern of dots formed on said second positive photo-resist as a mask.