Optical disk apparatus using tilt and aberration correction control system
OwnerShinichi Konishi, Takeshi Nakajimainventors
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Abstract
A tilt control apparatus includes an orthogonal shift detector (9) which detects an orthogonal shift by comparing a pair of a plurality of tap coefficients (C1, . . . , C7) of a FIR filter and generates an orthogonal shift signal, and an actuator varies the inclination of the optical axis of the light beam to correct the orthogonal shift, and a tilt controller (10) controls the drive of the actuator in accordance with the orhogonal shift signal to minimize the orthogonal shift. In the information recording operation, the orthogonal shift obtained based on a recording track is previously stored in a temporary storage portion and the stored orthogonal shift is used to conduct the tilt control.
Claims14
A tilt control apparatus for controlling to minimize an error of an orthogonal shift in an orthogonal relationship between an optical disk surface and an optical axis of a light beam irradiated from an optical pickup onto the optical disk in combination with an adaptive equalizer adaptively renewing a plurality of tap coefficients of a FIR filter in an optical disk apparatus, the tilt control apparatus comprising:
- an orthogonal shift detector for detecting the orthogonal shift of the light beam using the tap coefficients of the adaptive equalizer and generating an orthogonal shift signal in accordance with the detected orthogonal shift;
- an inclination drive unit for varying the inclination of the optical axis of the light beam to correct the orthogonal shift;
- and
- a drive control unit for controlling the inclination drive of the inclination drive unit in accordance with the orthogonal shift signal to minimize the orthogonal shift of the light beam.
An aberration control apparatus for controlling to minimize an aberration contained in a spot of a light beam irradiated from an optical pickup onto the optical disk in combination with an adaptive equalizer adaptively renewing a plurality of tap coefficients of a FIR filter in an optical disk apparatus, the aberration correction control apparatus comprising:
- an aberration detector for detecting the aberration of the light beam spot using the tap coefficients of the adaptive equalizer and generating an aberration detection signal in accordance with the detected aberration;
- an aberration correcting unit for correcting the aberration of the light beam spot;
- and
- a correction control unit for controlling the aberration correction of the aberration correcting unit in accordance with the aberration detection signal to minimize the aberration of the light beam spot.
An optical disk apparatus for recording and reproducing information to and from an optical disk, comprising:
- an optical pickup irradiating a light beam onto an optical disk surface for recording and reproducing the information to generate an analogue reproduction signal therefrom;
- an A/D converter for converting the analogue reproduction signal into a digital form;
- an adaptive equalizer receiving the digital reproduction signal from the A/D converter and adaptively renewing a plurality of tap coefficients of a FIR filter;
- and
- an aberration control apparatus for controlling to minimize an aberration contained in a spot of a light beam irradiated from the optical pickup onto the optical disk,
- wherein the aberration control apparatus comprises:
- an aberration detector for detecting the aberration of the light beam spot using the tap coefficients of the adaptive equalizer and generating an aberration detection signal in accordance with the detected aberration;
- an aberration correcting unit for correcting the aberration of the light beam spot;
- and
- a correction control unit for controlling the aberration correction of the aberration correcting unit in accordance with the aberration detection signal to minimize the aberration of the light beam spot.
Dependencies are inferred from the claim text.