Patent ID: 7231705

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; depositing a second film composed of one or more layers 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; and etching the one surface side of said base after said step of removing, said step of etching including dry-etching the one surface side of said base using etching particles which do not substantially form clusters, with a main incident angle of said etching particles to the one surface side of said base being set in a range of 60° to 90° relative to a normal direction of the one surface of said base, wherein said dry etching in said step of etching is performed while rotating said base about an axis substantially parallel with the normal direction.