OPTICAL PICKUP AND INFORMATION DEVICE

摘要

An optical pickup (100) is provided with (i) a light source for outputting laser beams; (ii) an optical system (108 or the like) for guiding the outputted laser beams to one of a plurality of recording layers; (iii-1) a first light receiving element (114 or the like) for receiving returning beams reflected by the recording layers; (iii-2) a second light receiving element (114 or the like) for receiving stray light; (iv) a pin hole (117) having a prescribed opening section which selectively transmits a part of one returning beam reflected by one recording layer, among the returning beams, so as to be received by the first light receiving element; (v) an operating means (314c or the like) for operating RF signals based on the one received returning beam; (vi) an operation control means (314) for controlling the operating means to operate the RF signals based on operation coefficients, by calculating the operation coefficients based on a difference between one signal component which corresponds to the one returning beam and other signal component which corresponds to the stray light.