| http://www.w3.org/ns/prov#value | - For example, as shown in FIG. 1, the optical head is composed of optical elements, such as a semiconductor laser 1, a collimator lens 2, polarization beam splitters (PBSs) 3, 6 and 7, an objective lens 4, a condenser lens 5, a servo sensor 8, an RF sensor 9 and the like, which elements are mounted in a head block.
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