Optical Disk Drive and Method for Performing Layer Jumps

Abstract

The invention provides a method for performing a layer jump of a disk. First, a tracking error generation method is determined according to a layer type of a target layer when the layer jump is performed. A tracking error signal is then generated according to the tracking error generation method.

1 . A method for performing a layer jump of a disk, comprising:
 determining a tracking error generation method according to a layer type of a target layer when the layer jump is performed;   generating a tracking error signal according to the tracking error generation method.   
     
     
         2 . The method as claimed in  claim 1 , further comprising moving a laserbeam along a track of the target layer according to the tracking error signal. 
     
     
         3 . The method as claimed in  claim 1 , wherein determining of the tracking error generation method comprises:
 when the target layer is a BD-ROM layer, determining the tracking error generation method to be a differential phase detection (DPD) method; and   when the target layer is a BD-RE layer or a BD-R layer, determining the tracking error generation method to be a differential push-pull (DPP) method.   
     
     
         4 . The method as claimed in  claim 1 , wherein the method further comprises:
 focusing a laserbeam on the target layer of the disk before the tracking error generation method is determined.   
     
     
         5 . The method as claimed in  claim 1 , wherein the method further comprises:
 focusing a laserbeam on the target layer of the disk after the tracking error generation method is determined.   
     
     
         6 . The method as claimed in  claim 1 , wherein the method further comprises:
 focusing a laserbeam on the target layer of the disk when the tracking error generation method is determined.   
     
     
         7 . The method as claimed in  claim 1 , wherein the method further comprises:
 determines a plurality of compensator parameters according to the tracking error generation method.   
     
     
         8 . The method as claimed in  claim 1 , wherein the step of moving the laserbeam along the track further comprises:
 adjusting a gain and a phase of the tracking error signal according to the tracking error generation method;   generating a tracking control output signal according to the adjusted tracking error signal; and   controlling a pickup head emitting the laser beam according to the tracking control output signal.   
     
     
         9 . The method as claimed in  claim 1 , wherein the disk is a BD Intra-Hybrid disk. 
     
     
         10 . An optical disk drive, performing a layer jump, comprising:
 a first tracking error generator, generating a first tracking error signal according to a differential phase detection (DPD) method;   a second tracking error generator, generating a second tracking error signal according to a differential push-pull (DPP) method;   a decision module, determining a tracking error generation method according to a layer type of a target layer of a disk when the layer jump is performed; and   a multiplexer, selecting a tracking error signal from the first tracking error signal and the second tracking error signal according to the tracking error generation method.   
     
     
         11 . The optical disk drive as claimed in  claim 10 , wherein the optical disk drive comprises:
 a tracking error compensator, generating a tracking control output signal according to the tracking error signal for controlling a laserbeam along a track of the target layer.   
     
     
         12 . The optical disk drive as claimed in  claim 10 , wherein the decision module determines the tracking error generation method to be a differential phase detection (DPD) method when the target layer is a BD-ROM layer, and determines the tracking error generation method to be a differential push-pull (DPP) method when the target layer is a BD-RE layer or a BD-R layer. 
     
     
         13 . The optical disk drive as claimed in  claim 10 , wherein the optical disk drive further comprises:
 a focusing error generator, generating a focusing error signal; and   a focusing error compensator, focusing the laserbeam on the target layer of the disk according to the focusing error signal before the tracking error generation method is determined.   
     
     
         14 . The optical disk drive as claimed in  claim 10 , wherein the optical disk drive further comprises:
 a focusing error generator, generating a focusing error signal; and   a focusing error compensator, focusing the laserbeam on the target layer of the disk according to the focusing error signal after the tracking error generation method is determined.   
     
     
         15 . The optical disk drive as claimed in  claim 11 , wherein the decision module determines a plurality of compensator parameters according to the tracking error generation method, and the tracking error compensator generates the tracking control output signal according to the adjusted tracking error signal. 
     
     
         16 . The optical disk drive as claimed in  claim 10 , wherein the disk is a BD
 Intra-Hybrid disk.   
     
     
         17 . A method for performing a layer jump of a disk, wherein the disk comprises only a BDROM layer and a BD-RE/R layer, the method comprising:
 switching a tracking error generation method between a differential phase detection (DPD) method and a differential push-pull (DPP) method when the layer jump is performed; and   generating a tracking error signal according to the tracking error generation method.   
     
     
         18 . The method as claimed in  claim 17 , wherein the method further comprises:
 focusing a laserbeam on the target layer of the disk before the tracking error generation method is switched.   
     
     
         19 . The method as claimed in  claim 17 , wherein the method further comprises:
 focusing a laserbeam on the target layer of the disk after the tracking error generation method is switched.   
     
     
         20 . The method as claimed in  claim 17 , wherein the method further comprises:
 focusing a laserbeam on the target layer of the disk when the tracking error generation method is determined.   
     
     
         21 . The method as claimed in  claim 17 , wherein the tracking error generation method is switched to the differential phase detection (DPD) method when the target layer is the BD-ROM layer, and the tracking error generation method is switched to be the differential push-pull (DPP) method when the target layer is the BD-RE/R layer. 
     
     
         22 . The method as claimed in  claim 17 , wherein the step of moving the laserbeam along the track further comprises:
 generating a tracking control output signal according to the adjusted tracking error signal; and   controlling a pickup head emitting the laser beam according to the tracking control output signal.   
     
     
         23 . An optical disk drive, performing a layer jump on a disk, wherein the disk comprises only a BDROM layer and a BD-RE/R layer, and the optical disk drive comprises:
 a first tracking error generator, generating a first tracking error signal according to a differential phase detection (DPD) method;   a second tracking error generator, generating a second tracking error signal according to a differential push-pull (DPP) method;   a switch module, switching a tracking error generation method between the DPD method and the DPP method when the layer jump is performed; and   a multiplexer, selecting a tracking error signal from the first tracking error signal and the second tracking error signal according to the tracking error generation method.   
     
     
         24 . The optical disk drive as claimed in  claim 23 , wherein the switch module switches the tracking error generation method to the differential phase detection (DPD) method when the target layer is the BD-ROM layer, and switches the tracking error generation method to the differential push-pull (DPP) method when the target layer is the BD-RE/R layer. 
     
     
         25 . The optical disk drive as claimed in  claim 23 , wherein the optical disk drive further comprises:
 a focusing error generator, generating a focusing error signal; and   a focusing error compensator, focusing the laserbeam on the target layer of the disk according to the focusing error signal before the tracking error generation method is switched.   
     
     
         26 . The optical disk drive as claimed in  claim 23 , wherein the optical disk drive further comprises:
 a focusing error generator, generating a focusing error signal; and   a focusing error compensator, focusing the laserbeam on the target layer of the disk according to the focusing error signal after the tracking error generation method is switched.   
     
     
         27 . The optical disk drive as claimed in  claim 23 , wherein the optical disk drive comprises:
 a tracking error compensator, generating a tracking control output signal according to the tracking error signal for controlling the laserbeam to move along a track of the target layer.   
     
     
         28 . The optical disk drive as claimed in  claim 27 , wherein the switch module determines a plurality of compensator parameters according to the switched tracking error generation method, and generates the tracking control output signal according to the adjusted tracking error signal.