Konica-minolta Holdings, Inc.

Kouhei Ohta

Mitsuru Mimori

An optical element comprises: a diffractive structure having a plurality of diffracting ring-shaped zones arranged around an optical axis on at least one optical surface; and an optical path difference giving structure arranged on an optical surface of at least one of the plurality of diffracting ring-shaped zones, for giving a prescribed optical path difference to a prescribed light beam passing through the diffracting ring-shaped zone, wherein the optical surface of the diffractive structure is a structure having a diffracting function for setting L-th (L&#x2260;0) order diffracted light of the light beam having the first wavelength &#x3bb;to a maximum diffraction efficiency and for setting M-th (M&#x2260;0) order diffracted light of the light beam having the second wavelength &#x3bb;to a maximum diffraction efficiency in case of an assumption of no existence of the optical path difference giving structure.

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Hachioji, Japan

Kouhei Ohta