| 摘要 |
The object of this invention is to provide a mold releasing method for a diffraction optical element, which enables stable mass production of a diffraction optical element free from deformation or damage due to mold release. In order to achieve this object, 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, includes the steps of pressing a central portion of the diffraction optical element toward the mold, and pushing a periphery of the diffraction optical element in a direction to separate from the mold, so that mold release progresses from the periphery toward the central portion of the diffraction optical element. The method also includes the step of adjusting the balance with a plurality of hydraulic cylinders without pressing the central portion, so that mold release progresses toward the center.
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