Patent ID: 6996038
Filing Date: 2006-02-07
Classification: G11B

Abstract:
1. An optical disc apparatus comprising: an optical pickup having a light source for emitting a light beam to an optical disc and a photo-detector for receiving a reflected beam reflected by the optical disc so as to read data recorded on the optical disc, the photo-detector further having a plurality of partitioned photo-detecting areas; a signal processor for generating a readout signal corresponding to the data recorded on the optical disc, a focusing error signal corresponding to discrepancy between a focal point of the light beam and a data recording face of the optical disc, and a tracking error signal corresponding to discrepancy between the focal point of the light beam and a track on the recording face of the optical disc with using the signals outputted from the photo-detector; a servo controller for adjusting the focal point of the light beam corresponding to the focusing error signal and the tracking error signal; a level adjuster for adjusting levels of photo-detecting signals outputted from the photo-detecting areas of the photo-detector, having a plurality of amplifiers and a plurality of A/D converters connected to the amplifiers for amplifying the photo-detecting signals outputted from respective photo-detecting areas of the photo-detector, so that the signals directly outputted from the level adjuster are digital signals outputted from the A/D converters; and a gain adjuster for adjusting gains of the amplifiers with using signals directly outputted from the level adjuster so as to adjust the levels of the photo-detecting signals substantially even.