摘要 |
An optical information storage unit records information on and/or reproduces information from both a land and a groove of an optical recording medium which have approximately the same width. The optical information storage unit is provided with a first optical system, including a first light source and a first phase compensation means, detecting light from the land of the optical recording medium, and a second optical system, including a second light source and a second phase compensation means, detecting light from the groove of the optical recording medium. The first and second phase compensation means have mutually different phase compensation quantities.
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