Konica Minolta Opto, Inc.

Youichi Ogawa

Kazunari Tada

Nobuo Mushiake

Kazuyuki Nishi

Tadafumi Sakata

Provided is a method for manufacturing optical elements, the method including the following processes: a process to determine the wave-front aberration for a lens fabricated using a reference die, and then choose the integer multiple of a predetermined constant that is closest to the difference between a lens design value and the wave-front aberration for the lens fabricated using the reference die; and a process to determine the amount of aberration correction that cancels out the aforementioned integer multiple aberration, change the lens design so that either the low-order spherical aberration or the low-order astigmatism therefor becomes equal to the aberration correction, and fabricate a correction die from either a first or a second die, with the shape of the molding surface thereof changed on the basis of the changed design value. Then the die design value is decided upon, yielding a final die.

Method of manufacturing optical elements

An objective lens causes birefringence, which causes wave aberration in outgoing light from the objective lens. A coated objective lens has a dielectric multilayer film that can reduce astigmatism component of the wave aberration to 5 m&#x3bb; rms or smaller when 10 m&#x3bb; rms or larger astigmatism component of wave aberration is generated.

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Sakai, Japan

Youichi Ogawa