Patent ID: 7449285
Filing Date: 2008-11-11
Classification: G03F

Abstract:
1. A method for forming a pattern using a photomask in which, on a transparent substrate having light transmitting properties with respect to exposure light, a mask pattern having a semi-light shielding portion and a phase shifter, and a light-transmitting portion where the mask pattern is not located are provided, characterized by comprising the steps of: forming a resist film on a substrate; irradiating the resist film with the exposure light through the photomask; and developing the resist film which has been irradiated with the exposure light to form a resist pattern, wherein in the photomask, the semi-light shielding portion has a transmittance which allows the exposure light to be partially transmitted, and transmits the exposure light in the same phase as that of the light-transmitting portion, the phase shifter transmits the exposure light in a phase opposite to that of the light-transmitting portion, the mask pattern is provided so as to surround the light-transmitting portion, the phase shifter is formed in a ring-shape around the light-transmitting portion, and the outline of the ring-shaped phase shifter is similar to the outline of the light-transmitting portion.