Mold releasing method and apparatus for diffraction optical...

Details Mold releasing method and apparatus for diffraction optical... Mold releasing method and apparatus for diffraction optical...

2005-06-21

2005-06-21

Vargot, Mathieu D. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

C264S334000, C425S4360RM, C425S808000

Reexamination Certificate

active

06908575

ABSTRACT:
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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patent: 3-79314 (1991-04-01), None
M.W. Farn, et al., “Diffractive Doublet Corrected On-Axis at Two Wavelengths,”Proceedings of the SPIE: International Lens Design Conference, vol. 1354, Jun. 11-14, 1990, pp. 24-29.
C. Londofño, et al., “The Design of Achromatized Hybrid Diffractive Lens Systems,”Proceedings of the SPIE: International Lens Design Conference, vol. 1354, Jun. 11-14, 1990, pp. 30-37.

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