Mitsumi Electric Company Ltd.

Hirokazu Furuse

Keiichi Sato

Masayoshi Sugawara

Atsushi Kirii

Atsushi Kikuchi

Tadashi Adachi

An optical pickup comprising: a diffraction grating, a beam splitter and laser beam guiding optical components that change direction of laser beams, which are placed on a light path constituted by a semiconductor laser that emits dual wavelength laser beams and an information recording surface of an optical disk, wherein a wavelength plate is provided on a light path between said diffraction grating and said semiconductor laser so that a laser beam irradiated on the recording surface of said optical disk becomes an elliptically polarized (including circularly polarized) beam or a beam having a polarizing plane that produces an angle of 30&#x2013;60 degrees relative to a radius direction.

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Yamagata, Japan

Hirokazu Furuse