| http://www.w3.org/ns/prov#value | - In this embodiment, the optical disk 200 is rotatively driven at a constant linear velocity (CLV) when recording data and when forming a visible image. [0054] An optical pickup 10 is a unit composed mainly of a laser diode, and an optical system, such as an object lens and a mirror, and a light receiving element for receiving return light. [0055] When recording (reproducing) data or forming a visi
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