US 6,747,922 B2 · Track-jump controlling apparatus and method

Abstract

A track-jump controlling apparatus that controls track-jump operations over disks complying with various DVD data formats includes a quad photodetector having quadrants B1 to B4, a DPDTE signal generator 13 for generating DPD tracking error signals, a push-pull signal generator 14 for generating push-pull signals, and a TZC signal generator 15 having a selector switch 15a for switching the path between the DPDTE signals and the push-pull signals and a comparator 15b for generating TZC signals. In order to prevent failure to obtain proper TZC signals in a seek operation with respect to a DVD-RW, etc. involving passage over an unrecorded area during reproduction, for example, the selector switch 15a is switched to the push-pull signal side to prevent track counting failure associated with the track-jump operation with respect to the DVD-RW.

Claims10

Dependent claims

A track-jump controlling apparatus for controlling a track-jump operation by moving a pickup in a radial direction of a disk, which is one of different types of disks, the apparatus comprising:

a first generating device for generating a differential phase detection (DPD) tracking error signal based on photodetection signals from said pickup;
a second generating device for generating a push-pull signal based on said photodetection signals from said pickup;
a signal selecting device for selecting one of said DPD tracking error signal and said push-pull signal based on information recorded on the disk in advance as a signal for use in said track-jump operation according to a state of said disk before a seek operation is performed;
a track-jump operation device for performing said track-jump operation from a current reproducing position to a seek target position over said disk, while counting track crossings using said signal selected by said signal selecting device.

1 more element

A track-jump controlling method of controlling a track-jump operation by moving a pickup in a radial direction of a disk, which is one of different types of disks, the method comprising the processes of:

a first generating process of generating a DPD tracking error signal based on photodetection signals from said pickup;
a second generating process of generating a push-pull signal based on said photodetection signals from said pickup;
a selecting process of selecting one of said DPD tracking error signal and said push-pull signal based on information recorded on the disk in advance as a signal for use in a seek operation, according to a state of said disk before said track-jump operation is performed;
and
a controlling process of controlling said track-jump operation such that said pickup moves from a current reproducing position to a seek target position over said disk, while counting track crossings using said selected signal.

2 more elements

Dependencies are inferred from the claim text.

Track-jump controlling apparatus and method

Life of this patent

Track-jump controlling apparatus and method

Life of this patent

Abstract

Claims10