Patent ID: 8293434

Claim:
A method for forming convex patterns in which a substrate coated with a positive photosensitive material is irradiated with exposure light through a photomask to expose the photosensitive material, thereby forming a plurality of types of convex patterns of different heights on the substrate, the method comprising the following steps to be executed while conveying the substrate coated with a positive photosensitive material under the photomask in one direction at a constant velocity: repeatedly exposing outer regions of first light shielding portions on convex patterns forming portions that are sequentially shielded from light by a plurality of first shielding patterns arranged in the conveying direction of the substrate among the plurality of first shielding patterns formed on the photomask corresponding to a plurality of types of convex pattern forming portions for the plurality of types of convex patterns on the substrate by a predetermined number of times; exposing an outer region of a second light shielding portion on a predetermined convex pattern that has a predetermined area and is shielded from light by a second shielding pattern formed on the photomask corresponding to a substantial center of a predetermined convex pattern forming portion among the plurality of types of convex pattern forming portions to a predetermined depth, and exposing a convex pattern forming portion other than the predetermined convex pattern forming portion that is irradiated with exposure light through an opening pattern formed on the photomask corresponding to the convex pattern forming portion other than the predetermined convex pattern forming portion to a predetermined depth; and developing the photosensitive material on the substrate.