Servo control apparatus, servo control method and information reproducing apparatus
AssigneePioneer Corporation
InventorKanji Ishihara
Life of this patent
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Abstract
A servo control apparatus for carrying out a servo control when information is reproduced from an information record medium having an embossed area where information cannot be recorded, such as DVD-RW, is provided. The servo control apparatus detects a position of a light spot formed by the light beam except the embossed area on the information record medium, and shifts the light spot beyond the embossed area to a predetermined target position to be radiated with the light beam, which is positioned in another side of the embossed area on the information record medium, on the basis of the detected position.
Claims14
A servo control apparatus for carrying out a servo control when information is reproduced by using a light beam on an information record medium having a signal change area in which a detection signal obtained from the information record medium on the basis of reflection light of the light beam indicates a different characteristics compared with that of the detection signal obtained during the reproduction of the information, comprising:
- a detecting device for detecting a position of a light spot formed by the light beam except the signal change area on the information record medium;
- and
- a shifting device for shifting the light spot beyond the signal change area to a predetermined target position to be radiated with the light beam, which is positioned in another side of the signal change area on the information record medium, on the basis of the detected position.
A servo control apparatus for carrying out a servo control when information is reproduced by using a light beam on an information record medium having a signal change area in which a detection signal obtained from the information record medium on the basis of reflection light of the light beam indicates a different characteristics compared with that of the detection signal obtained during the reproduction of the information, comprising:
- a detecting device for detecting an end of the signal change area;
- and
- a shifting device for shifting a radiating position of the light beam beyond the signal change area to a predetermined target position to be radiated with the light beam, which is positioned in opposite side of the signal change area to a side where the end is detected on the information record medium, on the basis of the detected end.
A servo control method of carrying out a servo control when information is reproduced by using a light beam on an information record medium having a signal change area in which a detection signal obtained from the information record medium on the basis of reflection light of the light beam indicates a different characteristics compared with that of the detection signal obtained during the reproduction of the information, comprising the processes of:
- detecting a position of a light spot formed by the light beam except the signal change area on the information record medium;
- and
- shifting the light spot beyond the signal change area to a predetermined target position to be radiated with the light beam, which is positioned in another side of the signal change area on the information record medium, on the basis of the detected position.
A servo control method of carrying out a servo control when information is reproduced by using a light beam on an information record medium having a signal change area in which a detection signal obtained from the information record medium on the basis of reflection light of the light beam indicates a different characteristics compared with that of the detection signal obtained during the reproduction of the information, comprising the processes of:
- detecting an end of the signal change area;
- and
- shifting a radiating position of the light beam beyond the signal change area to a predetermined target position to be radiated with the light beam, which is positioned in opposite side of the signal change area to a side where the end is detected on the information record medium, on the basis of the detected end.
Dependencies are inferred from the claim text.