OPTICAL ELEMENT, OPTICAL PICKUP AND OPTICAL DISK DEVICE

摘要

PROBLEM TO BE SOLVED: To make a diffraction element present excellent characteristics.

SOLUTION: The diffraction element 20 is easily designed so that outside partial mass Q exceeds an adjustment unit of a delivery amount of a cover material MC in a delivery device 62 to prevent quality deterioration in manufacturing since capacity in the outside part ARo is increased and the outside partial mass Q is increased by providing a liquid pool part 20Cr in the outside part ARo on the top surface 20Ca of a base layer 20C.

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