Optical disc apparatus
OwnerHiroyuki Tsuchinaga, Toshimitsu Kakuinventors
Life of this patent
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Abstract
An optical disc apparatus prevents erroneous compensation of tilt and minimizes distortion of waveform of the optical and electrical transmitter channel as a whole. For this purpose, a group delay compensator that assures flat frequency characteristic of the gain and can adjust frequency characteristic of group delay is provided to the electrical transmitter of the optical disc apparatus including tilt controller and settings of tilt and group delay are optimized, in the adjustment, to provide minimum jitter of the reproduced signal or minimum code error of data obtained from the reproduced signal.
Claims9
An optical disc apparatus, comprising:
- means for rotating an optical disc,
- means for outputting a reproduced signal by irradiating an optical disc having information track in which information is recorded with an optical spot,
- group delay compensating means for compensating group delay for the reproduced signal, and
- means for adjusting a relative angle in the information track direction between the optical disc and optical axis of the optical beam.
An optical disc apparatus, comprising
- means for rotating an optical disc,
- means for outputting a reproduced signal by irradiating the optical disc having information track to which information is recorded with an optical spot, and
- group delay compensating means for compensating group delay for the reproduced signal.
An optical disc apparatus, comprising:
- a spindle motor for rotating an optical disc,
- an optical head for outputting a reproduced signal by irradiating an optical disc having information track to which information is recorded with an optical spot,
- a group delay compensator for compensating group delay for the reproduced signal, and
- a tangential tilt controller for adjusting a tilt of said spindle motor by changing a relative angle in the information track direction between the optical disc and optical axis of optical beam.
An optical disc apparatus, comprising:
- a spindle motor for rotating an optical disc,
- an optical head for outputting a reproduced signal by irradiating an optical disc having information track to which information is recorded with an optical spot,
- a group delay compensator for executing group delay compensation to the reproduced signal, and
- a tangential tilt controller for adjusting a tilt of an optical head in the direction of information track of the optical disc.
Dependencies are inferred from the claim text.