Patent ID: 6908575
Filing Date: 2005-06-21
Classification: B29C,B29D,B29L,Y10S

Abstract:
1. A mold releasing method for a diffraction optical element, of releasing from a mold a diffraction optical element formed by using the mold and having a convex lens function, which diffraction optical element has a grating vertex on its central side, said method comprising the steps of: pressing a central portion of the diffraction optical element toward the mold with a predetermined force; and releasing the diffraction optical element from the mold by applying a force of an elector device to a periphery of the diffraction optical element so that a mold release progresses from the periphery toward the central portion of the diffraction optical element, wherein, in said releasing step, when the force of the ejector device becomes equal to or larger than a specified value, the predetermined force applied to the central portion of the diffraction optical element is gradually reduced.