MOLDING DIE, INJECTION MOLDING MACHINE, AND METHOD OF MANUFACTURING OBJECTIVE OPTICAL ELEMENT

WIPO Patent Application WO/2011/122106

A1

Disclosed are a molding die, an injection molding machine, and a method of manufacturing an objective optical element, which reduce coma aberration due to lens axis displacement and provide high workability and high production efficiency. Specifically disclosed is an injection molding die for manufacturing an objective optical element for an optical pickup device having an NA value of 0.70—0.95, said molding die comprising a first die plate, a first core, a second die plate, and a second core, wherein the first die plate has a first core support hole and the second die plate has a second core support hole, wherein the second die plate is stacked on top of the first die plate in the direction of gravitational force, wherein the first core has a first optical transfer surface for forming a first optical surface of the objective optical element and holds the objective optical element when the die is opened, wherein the second core has a second optical transfer surface for forming a second optical surface of the objective optical element and does not hold the objective optical element when the die is opened, and wherein the absolute value of the radius of curvature of the first optical transfer surface is smaller than the absolute value of the radius of curvature of the second optical transfer surface.

SHIMIZU TSUTOMU (JP)
SUZUKI YOUSUKE (JP)

PCT/JP2011/052486

October 06, 2011

February 07, 2011

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KONICA MINOLTA OPTO INC (JP)
SHIMIZU TSUTOMU (JP)
SUZUKI YOUSUKE (JP)

B29C45/37; G02B3/00; G02B3/02; G11B7/1374; G11B7/22; B29L11/00

JP2008234724A	2008-10-02
JP2009181645A	2009-08-13

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