Patent ID: 7129027

Claim:
A method of manufacturing a microlens array comprising the steps of: forming a positive resist layer on one principal surface of a translucent substrate; subjecting said positive resist layer to exposure process and development process to form a plurality of circular resist layers disposed near each other at a predetermined distance, in which the exposure process is performed by using an exposure pattern allowing to form an opening of a circular ring shape surrounding said plurality of resist layers and thereafter the development process is performed; giving each of said plurality of resist layers a convex lens shape by heating and reflow process; and transferring the convex lens shape of each of said plurality of resist layers to the principal surface of said translucent substrate by dry etching process to form a microlens array having circular convex lenses corresponding to said plurality of resist layers on the principal surface of said translucent substrate, wherein said opening is formed integrally in the shape of a chain of rings.