| http://www.w3.org/ns/prov#value | - Such a problem has an inclination that it is actualized particularly in the case where the size of the optical pickup optical system is reduced when the lens group interval of the expander lens is reduced, the magnification of the expander lens is increased, or the numerical aperture of the coupling lens is increased. [0012] Further, for a personal computer use, or in order to mount in the optical
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