Patent ID: 7784170

Claim:
A pattern forming method comprising the steps of: forming a resist pattern for lift-off on a first film composed of one or more layers deposited on one surface side of a base; patterning said first film by dry etching said first film using said resist pattern for lift-off as a mask, thereby producing a desired pattern on the one surface side; depositing a second film composed of one or more layers onto the desired pattern on the one surface side of said base after said step of patterning with presence of said resist pattern for lift-off on said first film; removing said resist pattern for lift-off to remove a portion of said second film on said resist pattern for lift-off, thus leaving the one surface side having the second film deposited on the desired pattern; and etching the one surface side of said base not covered by the second film after said step of removing, said step of etching including dry-etching the one surface side of said base with a gas cluster ion beam.