OPTICAL PICKUP DEVICE, OPTICAL DISK DEVICE, AND LIGHT DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To receive return light of a two-beam optical system by a common light reception part and to perform proper luminous flux division for light reception.

SOLUTION: A common light reception part receives a luminous flux reflected on an optical disk of a luminous flux from a plurality of light sources by a semiconductor laser diode. In this case, an optical system guides the luminous flux emitted from each of the plurality of light sources and reflected on the optical disk to a luminous flux division plane of the light reception part in a state spot diameters are substantially the same. When θ⊥ as a far-field pattern perpendicular to an active layer is angles that are mutually different on the luminous flux division plane, a division line for dividing the luminous flux in a direction corresponding to the radial direction of the optical disk on the luminous flux division plane is formed in an area within the range of the angle of each θ⊥ of the luminous flux from the plurality of light sources.

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