| http://www.w3.org/ns/prov#value | - In other words, while, in a case of using a simple push-pull method as described above, there is a problem in which an offset is generated in a tracking-error signal due to an imbalance in the distribution of light on a surface of the optical receiving section when an optical axis of an object lens 2 shifts (a shift) or tilts (a tilt) from an optical axis of a fixed optical system.
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