METHOD AND DEVICE FOR DETECTING TRACKING ERROR SIGNAL, OPTICAL PICKUP, TRACKING CONTROLLER AND OPTICAL RECORDING /REPRODUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To eliminate the effect of a total reflection component generating on a face where an optical disk recording medium having a rugged face and a solid immersion lens (SIL) are facing each other, in detecting a tracking error signal by means of a near field optical system using the SIL.;SOLUTION: The detecting segments A-D of a quadripartite photodetector 31 for detecting servo error signals are designed to be unirradiated with the ring-shaped total reflection component. Its method, for example, is varying the magnification of a condensing lens in the prestage of a photodetector in an optical pickup, or providing a diaphragm in the prestage of the photodetector 31 to repel the total reflection component. Otherwise, a light transmitting protective layer having a refractive index larger than the effective numerical aperture of an objective lens with SIL is installed on the surface of the optical disk recording medium so that the detecting segments of the photodetector is unirradiated by eliminating the total reflection component generating on the opposing face of the optical disk recording medium and SIL.;COPYRIGHT: (C)2002,JPO