OPTICAL ELEMENT, RESIN MOLDING METAL DIE AND METHOD FOR MANUFACTURING OPTICAL ELEMENT

摘要

PROBLEM TO BE SOLVED: To obtain a resin molding metal die by which core deviation of two optical functional surfaces can be suppressed and thickness between two optical functional surfaces can be formed with sufficient accuracy and further to obtain an optical element for an optical pickup device in which core deviation of the two optical functional surfaces can be suppressed and thickness between two optical functional surfaces is accurate and which has stable performance even at high NA value.

SOLUTION: The optical element is provided with an optical functional section and a flange section 1f. The optical functional section is provided with a first optical functional surface 1b and a second optical functional surface 1a facing each other and the first optical functional surface has a curvature smaller than that of the second optical functional surface. The surface of the flange section at a second optical functional surface side is provided with a surface which is to be a mounting reference surface at the time of being mounted on a mirror frame and level difference of at least two stages which becomes lower as it goes away from an optical axis.

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