Patent ID: 8411255
Filing Date: 2013-04-02
Classification: G03B

Abstract:
1. A method of forming a pattern with dots or holes arranged in a two-dimensional period by illuminating, with illumination light, a mask having a light-shielding portion pattern on a translucent substrate, and performing projection and exposure of an object to be exposed through a projection optical system, the illumination light being an effective light source of multipole illumination, and the method comprising the steps of: performing a first exposure process with the mask placed at a first position relative to the object to be exposed; performing a second exposure process with the mask placed at a second position different from the first position relative to the object to be exposed, wherein the mask has line patterns having lines with a line width performing a third exposure process, after the second exposure process, with the mask placed at a third position further displaced from the second position by 2P/3 [m] in the direction, to thereby form a dot pattern in a two-dimensional period having a pitch of P/3 [m].