KR100209678B1 - Optical disk - Google Patents

Abstract

The present invention relates to a rewritable optical disc, and more particularly, to a wobbling signal and a bone control that divide a predetermined area of both sides of a mountain and valley track of an optical disc having a signal track composed of hills and valleys into a plurality of sections and have mountainside control information for each section. By alternately recording the wobbling signal having the information, since the control information of the corresponding track is divided into the wobbling signal having the same phase, the amplitude is not large so that the wobbling signal does not act as a noise during disc playback. The playback performance is improved, and since data can be recorded simultaneously on the mountain and valley tracks, the recording density is increased and the disk capacity is increased.

Description

Optical disc

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rewritable optical disc. In particular, the interface between the hill and the valley of a disc having a signal track composed of a peak and a groove is divided into a plurality of sections for each predetermined area, and the mountain control information is alternately for each section. Or it relates to an optical disk for recording the bone control information in a wobbling shape.

In a conventional reproducing optical disc, information is recorded along a track of an information recording medium surface, and the recorded information is reproduced by constant rotation of the disc and tracking of the light beam.

On the other hand, in the case of a rewritable optical disc, since the first disc has no information, disc control and recording are impossible.

Therefore, for this purpose, disc tracks are made by mountains and valleys, and information is recorded along the tracks, and control information for random access and rotation control is separately recorded on the disc, so that even on a blank disc in which no information signal is recorded. Enable tracking control.

At this time, a hard format and a soft format have been proposed as a method for recording the control information on a disc.

In the dual hard format, as shown in FIG. 1, information indicating the physical position of the disc is recorded in advance in the corresponding position of the disc.

That is, the header area shown in FIG. 1 is a hard-formatted area, which is preformatted at each sector start position.

In this case, since the actual data cannot be recorded in the header area, there is a disadvantage in that the recording area for recording data is reduced, and there is a problem in that it is not compatible with a reproduction-only disc that does not use such a format.

On the other hand, the soft format method is a method of recording control information in a wobbling shape along a track as in FIG. 2 or FIG.

Here, the wobbling is a modulated clock that modulates a constant clock and supplies information to the disk, that is, information about the corresponding position, and information about the disk rotation speed, to the power of the laser diode. It means to be recorded on the interface of the track to be recorded, for example, on the interface of the hill and the valley.

As such a wobbling method, the control information is wobbled so as to have the same phase on both boundary surfaces of the track as shown in FIG.

Looking at Figure 2, it can be seen that the wobble signal is in-phase, i.e., in phase, for the track of the peak L, and out-phased for the track of the valley G. It can be seen.

For example, looking at L2, the a and b wobble signals each have information about L2, and the position control information of L2 is detected from the difference between the a and b signals.

At this time, the phases of the two wobble signals must be corrected, for example, to be in-phased to detect the control information of L2 using the difference between the two signals.

That is, since the in-phase wobble signal recorded at each boundary of the track centered on the track of the mountain has control information of the corresponding mountain, data can be recorded only on the track of the mountain.

When the phases of both wobbling signals are aligned on the mountain side, the phases of both wobbling signals cannot be matched on the valley G side, so that there is no control information on the valley side. Since it is not available, it will eventually be impossible to record data.

As described above, in the wobble method of FIG. 2, since data can be recorded only on a mountain or valley track having a wobble signal whose phases coincide with each other, there is a problem that the recording capacity of the data decreases and the disk capacity decreases.

FIG. 3 is for solving the problem of FIG. 2 and is a method of recording a wobble signal only at one interface between a hill and a valley.

Here, the wobble signal does not need to be in-phased because it has absolute position information of the corresponding hill and the valley together.

Therefore, since both the control information for the hill and the valley can be known, data can be recorded on the track of the hill and the valley.

For example, the position control information of L1 may be known using the difference between the two signals c and d, and the position control information of G1 may be known using the difference between the two signals e and f.

At this time, since the amplitude of the A1 is not large because FIG. 2 records the control information on the peak in both wobble signals, the amplitude of the peak is increased because the peak A1 has both the peak and the valley control information.

In other words, the relationship of A1A2 is established.

Therefore, in the case of FIG. 3, since the amplitude A2 of the wobbling signal is increased, the wobble signal is more likely to act as noise during data reproduction.

The present invention is to solve the above problems, an object of the present invention is to divide the predetermined area into a plurality of sections and by recording the mountain side control information or the bone control information in each wobbling shape alternately, An optical disc is provided for recording all data on a track of a goal.

A feature of an optical disc according to the present invention for achieving the above object is that a certain area of the boundary surface of both sides of the peak and valley track of the optical disc having a signal track consisting of peaks and valleys is divided into a plurality of sections, and mountain control information for each section. The wobbling signal having a and the wobble signal having the bone control information are alternately recorded.

1 is a diagram showing a hard format structure for planting control information in a conventional optical disk.

2 shows a soft format structure for planting control information in a wobbling shape on both sides of a track of a conventional optical disc.

3 shows a soft format structure for planting control information in a wobbling shape on one side of a track of a conventional optical disc.

4 is a view showing a soft format structure for planting control information in a wobbling shape on an optical disk according to the present invention.

5 is a detailed view of FIG.

6 shows an example of mastering an optical disc according to the invention.

* Explanation of symbols for main parts of the drawings

AM: Signal to start of control information area

PA: Signal to end of control information area

IA: Physical location information IDE: Error detection code of physical location information

L: Mountain track G: Goal track

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a view showing the arrangement of a wobble signal recorded on each interface of an optical disk having tracks of hills and valleys according to the present invention, and shows the address (AM) and the end of the control information area, which signals the start of the control information area. The signal is divided into a plurality of sections between PAs (postambles), and in each phase, the wobble signals on both sides of the mountain track are recorded in phase or the wobble signals on both sides of the valley track are recorded in phase.

Therefore, the up and down wobble signals of the portions hatched in FIG. 4 are in phase.

That is, the control information of the track of the mountain and the track of the goal is skipped by one section, and the phase is recorded in a wobbling shape.

Therefore, the mountain's control information is divided and recorded in the wobble signal whose phases coincide at both boundary surfaces of the mountain track, and the valley's control information is separately recorded in the wobble signal whose phases are coincident at the boundary surfaces on both sides of the mountain track.

Therefore, the control information of the corresponding mountain or the corresponding valley can be read using the difference between two wobble signals having the same phase.

In addition, data can be recorded only in the track of the hill and the track of the valley where the phase of the wobble signal coincides.

For example, in FIG. 4, when the track of the mountain L1 is viewed, in the region g and i, since the wobbling signal is in phase with L1, data can be recorded in this region, but in the region h, the wobbling signal is compared to L1. Data can not be recorded because it is out-phased.

That is, the control information of L1 is separately recorded in the up and down wobbling signals of the g and i regions, and the control information of the different valleys having the L1 is recorded in the up and down wobbling signals of the h region.

In addition, when viewing the track of the goal G1, the j area and the l area cannot record data because the wobbling signal is out-phased with respect to G1, and in the k area, since the wobbling signal is in phase with G1, the data cannot be recorded. Can be recorded.

Similarly, control information of G1 is separately recorded in the up and down wobbling signals of the k region, and control information of different mountains with G1 interposed therebetween is recorded in the up and down wobbling signals of the j and l regions.

In other words, between the AM and the PA in the in-phase, control information consisting of ID and IDE is repeatedly recorded alternately between the hill and the valley as shown in FIG.

This positional information is important information necessary for control, and is repeatedly recorded several times.

Here, ID is usually 4 bytes as physical location information, and IDE is usually 2 bytes as error detection code of physical location information.

At this time, AM can use '11101000' as 8-bit information and PA can also use '10001110' as 8-bit, and both AM and PA are in phase.

The recorded control information is biphase modulated with '0' to '10' and '1' to prevent the same 0 and 1 from being repeated many times.

This prevents the data signal from going to the low frequency band.

In addition, since the control information of the corresponding track is divided into the wobbling signals in the in-phase, data can be recorded in both the hill and the valley without the amplitude being large, thereby increasing the disk capacity.

In order to master the optical disk in this manner, two beams are separately used as shown in FIG.

At this time, the first beam is periodically alternated by a signal obtained by modulating only the upper wobbling signal, and the second beam is periodically altered by a signal modulated only by the lower wobbling signal.

Therefore, the wobbling signal can be recorded on both sides of the mountain and valley tracks with a small amplitude, and both the mountain and valley tracks can be used as the data recording area.

Similarly, when the control information is reproduced, two beams are used to read mountain side information and valley side information separately, and the corresponding position information can be read from each information and used for random access and disc rotation control.

That is, only two wobbling signals of the in-phase region are read using two beams to read the position information of the corresponding hill or valley.

As described above, according to the optical disk according to the present invention, the phases of the wobbling signals of the AM indicating the start of the control information area and the PA part indicating the end coincide, and the AM and the PA are divided into a plurality of sections and each section Each time, the wobbling signal whose phase is matched to the track of the mountain and the wobbling signal whose phase is matched to the track of the valley are alternately recorded, so that the control information of the corresponding track is separately recorded in the wobbling signal having the same phase. The amplitude of the wobbling signal becomes small, and the small amplitude wobbling signal does not act as noise during disc reproduction, thereby improving data reproduction performance.

In addition, since both mountain and valley tracks can be used as the data recording area, the recording density is increased and the disk capacity is increased.

Claims (9)

In an optical disc having a signal track consisting of hills and valleys, a wobbling signal having valley control information and a wobbling signal having valley control information for each section is divided into a plurality of sections by dividing a predetermined area on both sides of the hill and valley tracks. Optical discs are recorded alternately. The optical disc of claim 1, wherein the predetermined area is an area between a signal AM for notifying the start of the control information area and a signal PM for notifying the end. The optical disc according to claim 1, wherein the wobble signal comprises a signal AM for notifying the start of the control information area, absolute position information of each sector, and a signal PM for notifying the end of the control information area. 4. The optical disc of claim 3, wherein the positional information is repeatedly recorded so that the peaks and valleys of the wobble signal alternate with each other. The optical disc according to claim 1, wherein the wobbling signal is in phase with both the signal AM for notifying the start of the control information area and the signal PM for notifying the end. The optical disc according to claim 1, wherein the wobbling signal having the mountain side control information is in phase with each other at the boundary surfaces of the mountain tracks. The optical disk according to claim 1, wherein the wobbling signal having the bone control information is coincident with the phases of both boundary surfaces of the track of the bone. The method of claim 1, wherein two beams are used to periodically alternate the wobbling signal to the optical disk by a signal that modulates only the lower wobbling signal and the other beam by a signal that modulates only the upper wobbling signal. An optical disc characterized by recording. The optical disc according to claim 1, wherein when reading control information recorded in the wobbling shape, two beams are used to read mountain information and valley information, and the corresponding position information is read from each information.