摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pickup in which excellent tracking signals and signals for verify can be obtained even if an access range of an objective lens is expanded, and an optical recording and reproducing apparatus. <P>SOLUTION: An optical pickup 4 comprises a light source 6, a first diffraction element 8a, an objective lens 5, a lens actuator 20, a wavelength plate 9, a second diffraction element 8b and a photodetector 12. The first diffraction element 8a diffracts light which is polarized in a specific direction. The objective lens 5 converges a recording beam and a reproducing beam generated by the diffraction onto the same track of an optical recording medium 2. The lens actuator 20 shifts the objective lens 5 such that an upper limit of a shift amount from an initial position in a tracking direction is equal to or more than 0.3 mm and equal to or less than 0.6 mm. In two diffraction areas in which light polarized in a direction orthogonal to the specific direction is diffracted, the second diffraction element 8b separates the recording beam reflected by the optical recording medium 2 into a transmitted light beam and a diffracted light beam. The photodetector 12 includes a plurality of photodetection elements for detecting the transmitted light beam, the diffracted light beam and the reproducing beam reflected by the optical recording medium, respectively. <P>COPYRIGHT: (C)2013,JPO&INPIT |