Importance

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Abstract

First order diffraction lights reflected on a first signal face for reproducing an optical disc and further deflected by a spatial divide element converge to spots 21a to 21d on photo acceptance cells 9A to 9D of a photodetector 9, while diffraction lights reflected on the first signal face and further diffracted by other orders of diffraction except plus first-order and diffraction lights reflected on a second signal face become crosstalk lights. Therefore, an optical pickup device is adapted so that minus (-) first-order diffraction lights 23a to 23d from the first signal face and the spots 21a to 21d of the first order diffraction light from the second signal face are not radiated on the photo acceptance cells 9A to 9D.

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First Claim