KR100657239B1 - Optical recording medium, apparatus and method for driving the same - Google Patents

Abstract

An optical recording medium, a driving apparatus thereof, and a method thereof are disclosed. The present invention utilizes a header unit in which the wobble structure and physical pit of the land and groove are arranged together to address the recording basic unit (sector or frame) stably and accurately in a situation where the track pitch is reduced for large capacity. By reading and / or reproducing the addressing information of, it is possible to provide a structure that reduces overhead, generates servo control signals, and facilitates manufacturing.

Description

Optical recording medium, apparatus and method for driving same

1A to 1D are examples of the header structure of a conventional optical disc.

2A to 2C are examples of the track structure of a general optical disc.

3A-3C are examples of the header structure at a position that is converted from an existing land track to a groove track or from a groove track to a land track.

4A and 4B are examples of contents of an existing header part.

FIG. 5 is a diagram illustrating a header portion signal and a slice level shown in FIG. 4B.

6 is a table summarizing signals according to the existing track wobble signal and PID structure.

7 is an example of a header structure according to the present invention.

FIG. 8 is a view showing the header structure shown in FIG. 7 in the transition area of lands and grooves.

9 is another example of a header structure according to the present invention.

10 is another example of a header structure according to the present invention.

11A and 11B are examples of the contents of the header portion according to the present invention.

12 is a block diagram of an optical disk driving apparatus according to an embodiment of the present invention.

FIG. 13 is a waveform diagram of a header part signal provided to the second channel Ch2 when having the header structure shown in FIG. 7.

FIG. 14 is a waveform diagram of a header part signal provided to the second channel Ch2 when having the header structure shown in FIG. 8.

15 is a table summarizing the track wobble signal and the signal according to the PID structure according to the present invention.

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to the field of optical recording media, in particular placing the header used for addressing at the boundary of an out-of-phase wobbled groove track with the wobbled land track, An optical recording medium comprising a pit and a mirror portion, and a driving apparatus and method thereof.

Currently, the development trend of optical discs requires high-capacity recording and high-speed playback in order to record and / or reproduce high definition (HD) -class video. Accordingly, there is a need for a multimedia technology capable of recording and / or playing back a lot of information on a recording medium such as rewritable or read only HD-DVD (Digital Versatile Disc).

In order to meet the needs of high-capacity recording and high-speed playback, various methods have been proposed. As an example, there may be a method of increasing the disk area or increasing the number of revolutions, but this is not practical due to the increase in the size of the disk and the player or the increase in production cost. Therefore, a method of increasing the recording density per unit area is effective and preferable.

)에 비례하고, 대물 렌즈의 개구수(NA:numerical aperture)에 반비례하므로, 단위 면적당 기록 밀도를 높이기 위해서는 레이저 파장을 줄이던지 고 개구수를 갖는 대물렌즈를 사용하여 트랙 피치(track pitch)를 줄여야 한다. The size of the recording laser spot is determined by the laser wavelength (

), And inversely proportional to the numerical aperture (NA) of the objective lens, in order to increase the recording density per unit area, it is necessary to reduce the laser wavelength or reduce the track pitch by using an objective lens having a numerical aperture. do.

In such an optical disk, particularly in the case of a recordable disk, the recording area is constantly divided into basic recording units (e.g., sectors or frames) in order to record in a predetermined unit. As such a basic recording unit, it is most important that the optical pick-up unit (hereinafter, referred to as "pickup") move to the position accurately and quickly without writing an error in order to read or write a physically divided area.

The area provided for this purpose is called a header field in an optical disc, and in the case of 2.6 GB (Giga Bytes) or 4.7 GB Random Access Memory (DVD-RAM), 128 bytes per sector are defined as a header part. The information is allocated and pre-pitted at the time of manufacturing the substrate. Information to be input includes VFO (Variable Frequency Oscillator) area for PLL (Phase Locked Loop), PID (Physical Identifier) area with sector number, IED (ID Error Detection) area for storing ID error detection information, modulation It consists of a PA (postamble) area for matching (modulation). Such a header is properly arranged at the head of the sector, and the pickup is addressed to a desired position, and then the sector number, sector type, land track and groove track can be recognized, and even servo control can be performed. Can be.

Representative examples of the arrangement of the existing header portion are as shown in FIG. 1, and G and L represent grooves and lands, respectively. In FIG. 1A, the tracks are located at the centers of land tracks and groove tracks, and respective headers are assigned to each track. This structure has the disadvantage that crosstalk occurs in adjacent tracks as the track pitch becomes narrow in the case of high density recording.

1B is a structure in which a header is located at the boundary between a land track and a groove track, and can be used together as a pair of tracks (land track and groove track) as one header. In particular, the header width can be wider than that shown in FIG. 1A, which is advantageous in terms of signal. However, they are biased to one side and therefore vulnerable to tracking offsets (called offsets or margins).

1C is a structure in which headers are disposed at the center of the groove track and the land track so that a plurality of headers do not overlap the adjacent track, and there is no crosstalk. However, since it cannot compensate in terms of servo control, a separate servo control compensation method is required.

FIG. 1D is a structure used in a DVD-RAM, and the structure shown in FIG. 1C is capable of compensating for the disadvantages of FIGS. 1A, 1B, and 1C by shifting by 1/2 the track pitch. However, since half of the header is staggered by one track pitch, it is most difficult in terms of manufacturing than other arrangements. For this reason, especially in the case of 4.7 GB DVD-RAM, the signal characteristics (or jitter) of the headers 1 and 2 and the signal characteristics (or jitter) of the headers 3 and 4 may not be the same. The contents of the header portion will be described with reference to FIG. 4.

20GB)의 대용량의 데이터를 저장하기 위해 트랙 피치를 줄이는 것 뿐만 아니라 기록 영역이 아닌 영역(오버헤드:overhead)들을 최소화함으로써 기록 가능한 영역(사용자 데이터 영역)을 증가시켜야 한다. DVD-RAM에서 차지하는 헤더부의 크기는 1 물리적 섹터를 기준으로 약 5%에 해당된다. 그러므로 고밀도 기록을 위해서 이와 같은 오버헤드 크기를 줄이기 위해서는 도 1b 및 도 1d 에 도시된 바와 같이 헤더부가 줄어드는 배치 즉, 인접 트랙의 경계에 헤더부가 위치하는 구조로 갈 필요가 있으나 단순히 도 1b에 도시된 바와 같은 배치로는 상술한 바와 같이 트랙 옵셋 등 서보 제어를 보상해주어야 한다.Therefore, HD class (15

In order to store a large amount of data (20 GB), the recordable area (user data area) should be increased by minimizing the track pitch as well as minimizing the non-record area (overheads). The size of the header portion of the DVD-RAM is about 5% based on one physical sector. Therefore, in order to reduce such overhead size for high density recording, it is necessary to go to the arrangement in which the header portion is reduced as shown in FIGS. 1B and 1D, that is, the structure in which the header portion is located at the boundary of the adjacent track, but simply shown in FIG. 1B. As described above, the servo control such as the track offset should be compensated as described above.

FIG. 2 is a diagram showing examples of the structure of a general track, FIG. 2A is a concentric circular track structure, FIG. 2B is a double spiral track structure, and FIG. 2C is a single spiral used in a DVD-RAM. single spiral) track structure. 1 shows a groove track, 2 shows a land track, and 3 shows a header portion allocated for each basic recording unit (here, sector).

In particular, in the single spiral track structure as shown in FIG. 2C, detection is made from the arrangement of the header portion at the point 4 at which the groove track and the land track are transitioned, i. The land signal and the groove track can be distinguished using the signal.

As such, when the single spiral track structure shown in FIG. 2C and the header structure shown in FIGS. 1B, 1C, and 1D have the header structure, the header structure at the point where the groove track and the land track are connected is shown in FIGS. 3b, shown in FIG. 3c. At the point where the groove track and the land track are connected, a header signal should be used to indicate whether the sector to which the header belongs is a land track or a groove track.

Therefore, in the header structure shown in FIG. 1A, the prepit information in the header may indicate whether the sector to which the header belongs is a land track or a groove track at the point where the groove track and the land track are connected.

In the header structure shown in FIG. 1B, at the point where the groove track and the land track are connected as shown in FIG. 3A, whether the sector to which the header belongs is a groove track or a land track may be informed from the prepit information in the header. (For example, two split signals I1 and I2 of the photodetector).

In the header structure shown in FIG. 1C, at the point where the groove track and the land track are connected as shown in FIG. 3B, whether the sector to which the header belongs is a groove track or a land track may be informed from the prepit information in the header. It can also be informed using the detected time difference.

In the header structure shown in Fig. 1D, the header is formed over the land track and the groove track, and since the front and rear headers are staggered by one track pitch, the header signal and the prepit information in the header accordingly are grooved as shown in Fig. 3C. At the point where the track and the land track are connected, it may be indicated whether the sector to which the header belongs is a land track or a groove track.

However, since the header shown in FIG. 1B spans the land track and the groove track, the header can be used in common, but information indicating whether the sector to which the header belongs is a land track or a groove track is provided in another header structure (FIG. 1C). And the same length of header as in FIG.

4A and 4B show examples of the contents of the existing header portion. That is, in the method of controlling the servo by CAV (Constant Angular Velocity), the header part indicates the address of each sector by the track number and the sector number as shown in FIG. 4A. However, in the method of controlling servo by ZCLV (Zone Constant Linear Velocity) used in DVD-RAM, the header part gives addressing information only by sector number instead of track number because the sector number per track is different as shown in FIG. 4B. Such information is contained in the PID region of FIG. 4B.

When the headers 1 and 2 (Header 1 field and Header 2 field) and the headers 3 and 4 (Header 3 field and Header 4 field) are staggered by one track pitch from each other (FIG. 1D), as shown in FIG. The VFO1 length is 36 bytes, which is longer than 8 bytes, which is the length of VFO2 of header 2 and header 4. If the headers are not staggered, the length of VFO1 of header 1 and header 3 can be 8 bytes equal to the length of VFO2 of header 3 and header 4, and the same signal characteristics can be obtained from multiple headers. There is a possibility to reduce the number.

When the headers are arranged in such a manner as described above, the signal (the PID signal in the first channel Ch1) and the slice level in the header portion according to the header change are shown in FIG. 5 as an example. In other words, VFO1 (shown as 3) of header 3 is generated because fluctuation of a certain time occurs at the slice level for slicing even at the point (A) at which header 1,2 and header 3,4 are connected. It is set to 36 bytes which is the same size as VFO1 (shown as 1) of 1. Therefore, the drive apparatus also detects only the next 8 bytes except for the first 28 bytes of each VFO1 of the header 1 and header 3.

FIG. 6 has the header arrangement shown in FIG. 1D and the header structure shown in FIG. 4B, and when the groove track and the land track each have the same wobble pattern of the same predetermined frequency and phase, from the arrangement of the existing wobble track and PID A table listing generated signals.

That is, due to the diffracted light from the land or groove, the first channel Ch1 corresponding to the result of the addition of the two output signals I1 and I2 of the photodetector, which is usually composed of two divided photodiodes, is used in both the groove track and the land track. The wobble signal is not output, and the wobble signal is output to the second channel Ch2 corresponding to the difference between the two output signals of the photo detector. Accordingly, the wobble signal is generated in the groove track and the land track only by the second channel Ch2 representing the signal difference between the left and right on the basis of the line formed in parallel with the track.

In addition, the PID is moved by 1/2 of the track pitch at the center of the land track or groove track to correspond to the first, second, third, and fourth PID (Header1 field, Header2 field, Header3 field, Header4 field in FIG. 4B). Is prepitted in the physical address area, so the signals I1 and I2 output from the two-segment photodetector divided in parallel with the track are generated as shown in FIG.

In this way, only the reference wobble signal is generated from the second channel Ch2, and it is possible to know whether the track currently being picked up is a land track or a groove track using only the PID signal, and from the land track to the groove track or the groove track. It can be used as information indicating that the track is switched to land track (hereinafter referred to as land / groove switching information).

In this respect, it is preferable that the track structure also generates a signal for knowing the position information of the land track and the groove track, so that the structure can be addressed more reliably. In addition, in order to address stably and accurately recording basic units (sectors or frames) in a situation in which the track pitch is reduced for high capacity, a header is disposed at the boundary between land and groove, while reducing the overhead and making the structure easy to manufacture. desirable.

Accordingly, an object of the present invention is to provide an optical recording medium in which a header is arranged at a boundary between land and groove, and a pit and a mirror part are formed at the front or the rear of the header part so that the land / groove switching information can be known even in the track structure. .

Another object of the present invention relates to land / groove switching information and servo using a header part signal and a track wobble signal detected from an optical recording medium having a pit and a mirror part formed at the front or the rear of the header part disposed at the boundary between the land and the groove. The present invention provides a driving device for generating control information.

It is still another object of the present invention to provide land / groove switching information and servo using a header portion signal and a track wobble signal detected from an optical recording medium having a pit and a mirror portion formed at the front or the rear of the header portion disposed at the boundary between the land and the groove. A driving method for generating related control information and the like is provided.

In order to achieve the above object, the optical recording medium of the present invention is characterized in that a header area indicating address information of a basic recording unit is composed of a physical identification area and a physical pit area.

In order to achieve the above another object, in the driving apparatus of the present invention, a header area representing address information is composed of a physical identification area and a physical pit area, and the header area is out-of-wound with the wobbled land track. An apparatus for driving an optical recording medium disposed at a boundary of a wobbled groove track of a phase, comprising: detecting means for detecting physical identification information and physical pit information, which are address information, from a optical recording medium tracked by a pickup and a physical identification And control means for discriminating the information and the physical pit information to generate land / groove switching information, servo-related control information, and the like to control the addressing of the pickup.

In order to achieve the above another object, in the driving method according to the present invention, a header area representing address information is composed of a physical identification area and a physical pit area, and the header area is wobbled grooves out of phase with the wobbled land track. A method of driving an optical recording medium disposed at a track boundary, the method comprising: detecting physical identification information and physical pit information, which are address information, from an optical recording medium tracked by a pickup; And controlling the addressing of the pickup by generating land / groove switching information and servo related control information according to the discriminating step and the discriminating result.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the optical recording medium and its driving apparatus and method according to the present invention.

7 and 8 illustrate an embodiment of a header structure according to the present invention, and FIG. 7 shows a part of a track running around a header between a groove sector and a groove sector, or a land sector and a land sector. FIG. 8 shows a header structure at a point (4 in FIG. 2C) where a land track and a groove track are alternately transitioned from a land track to a groove track or from a groove track to a land track in a single spiral track structure. The present invention is applicable to both the track structure of FIGS. 2A to 2C, in particular to a single spiral structure in which a land track and a groove track are alternately connected.

As a characteristic of the header structure shown in Fig. 7, the header is arranged at the boundary between the groove track and the land track, and each area constituting the header is arranged so as not to overlap each other in the adjacent header, and the track pitch has a land width or groove width. In this case, two track pitches are disposed, and the servo pit is alternately placed before or after the headers. A wobble pit 12 connected to the rear of the header 10 spanning the groove sector and the land sector is disposed, and a mirror field 11 is disposed in front of the header 10, and the groove sector and the land sector are disposed. A wobble pit 21 may be disposed in front of the header 20 that spans and a mirror portion 22 may be configured behind the header 20. In addition, according to the present invention, as shown in Figs. 11A and 11B, the elements constituting the header are composed of only the VFO area storing the synchronization pattern and the identification information (ID) area storing the sector number, thereby reducing the overhead. .

As shown in Fig. 8, the servo pits 31 and 42 are alternately arranged before or after the headers at two track pitches, even at the point where the land track and the groove track or the groove track and the land track are connected.

9 shows another example of the header structure according to the present invention, wherein the header is disposed at the boundary between the groove track and the land track, and if the land width or groove width is one track pitch, the two track pitches are disposed and the two track pitches are crossed. In other words, one header 50 has a predetermined number of PIDs arranged in the order of a VFO area and an ID area, and the other header 60 has a predetermined number of PIDs arranged in the order of an ID area and a VFO area. Before and after this header 50, the mirror part 51 and the servo pit 52 are arrange | positioned, respectively, The servo pit 61 and the mirror part 62 are arrange | positioned before and after the header 60, respectively. . This arrangement makes the crosstalk even stronger.

FIG. 10 is an example of another header structure of the present invention wherein the header is disposed at the boundary of the groove track and the land track and the servo pit is not physically wobbly as shown in FIG. 7 or FIG. Pits 72 and 81 may be disposed. In the figure, the mirror part 71 and the pit 72 are arrange | positioned before and behind the header 70, respectively, and the pit 81 and the mirror part 82 are arrange | positioned before and behind the header 80, respectively.

As another embodiment of the present invention, the servo pit (wobble pit) may be disposed only in front of the header in sector units, and the servo pit (wobble pit) may be disposed only in the sector unit behind the header.

By doing so, even when the track pitch is further reduced, crosstalk does not occur even when the ID information area that is a random pattern and the VFO area that is a single pattern overlap, and the pit width can be increased to increase the reliability of the header signal.

만큼 이위상(out-of-phase)으로 형성되고, 랜드 트랙의 워블 패턴이 동위상(in-phase)으로 형성되어 있다. 또한, 같은 그루브 트랙이라 하더라도 반경 방향으로 번갈아가며, 워블의 위상이 반대로 되어 있고, 같은 랜드 트랙이라 하더라도 반경 방향으로 번갈아가며 워블의 위상이 반대로 되어 있다. 즉, 그루브 트랙과 바로 다음 그루브 트랙 그리고 랜드 트랙과 바로 다음 랜드 트랙의 워블 위상이

만큼 차이가 있다. 이때는 광 검출기의 2 출력 신호의 가산한 결과에 해당하는 제1 채널(Ch1)로는 그루브 워블 신호가 출력되고, 광 검출기의 2 출력 신호의 감산한 결과에 해당하는 제2 채널(Ch2)로는 랜드 워블 신호가 출력된다.Further, the track wobble pattern of the present invention is a wobble pattern of a groove track.

As much as it is out-of-phase, the wobble pattern of the land track is formed in-phase. Further, even in the same groove track, the phases of the wobble are alternated in the radial direction, and even in the same land track, the phases of the wobble are reversed in the radial direction. That is, the wobble phase of the groove track, the next groove track and the land track and the next land track

As long as there is a difference. In this case, the groove wobble signal is output to the first channel Ch1 corresponding to the result of the addition of the two output signals of the photodetector, and the land wobble to the second channel Ch2 corresponding to the result of the subtraction of the two output signal of the photodetector. The signal is output.

만큼 이위상으로 형성되고 그루브 트랙의 워블 패턴은 동위상으로 형성되고, 그루브 트랙과 바로 다음 그루브 트랙 그리고 랜드 트랙과 바로 다음 랜드 트랙의 워블 위상이

만큼 차이가 있다. 이때는 광 검출기의 2 출력 신호의 가산한 결과에 해당하는 제1 채널(Ch1)로는 랜드 워블 신호가 출력되고, 광 검출기의 2 출력 신호의 감산한 결과에 해당하는 제2 채널(Ch2)로 는 그루브 워블 신호가 출력된다.Or, the wobble pattern of the land track

Is formed in two phases and the wobble pattern of the groove track is formed in phase, and the wobble phase of the groove track and the next groove track and the land track and the next land track is

As long as there is a difference. In this case, a land wobble signal is output to the first channel Ch1 corresponding to the result of the addition of the two output signals of the photodetector, and a groove is output to the second channel Ch2 corresponding to the result of the subtraction of the two output signals of the photodetector. The wobble signal is output.

When the track wobble pattern is formed as described above, since the wobble signal is generated in both the first channel Ch1 and the second channel Ch2, the position information of the land track and the groove track using the first channel wobble signal and the second channel wobble signal. Can always be monitored to compensate for the addressing error rate due to a reduction in the number of headers.

In addition, when the header is arranged at the boundary between the land and the groove track, the beam is much easier to control when mastering than when the header is arranged as shown in FIG. 1D. That is, in the case of using 2 beams, since the half of the header part is staggered by one track pitch in FIG. 1D, there is a manufacturing problem because tracking control is required not only when forming the groove but also when forming the pit of the header.

In the present invention, even when mastering with one beam, the beam can be easily controlled.

Considering the functionality of the header according to the present invention, the servo pit and the mirror are arranged in the space before and after the header portion composed of the VFO and ID as shown in Figs. 11A or 11B, so that not only tracking offset correction but also light source (laser diode) It can be used as a reference signal for power correction or to indicate whether the sector following the header is a land sector or a groove sector, and converts a land track to a groove track or a groove track to a land track at the connection point between the groove track and the land track. It can also inform the header signal to change the tracking polarity.

FIG. 11A is an example of the contents of the header portion 19 shown in FIG. 7, and FIG. 11B is an example of the contents of the header portion 20 shown in FIG. 7. In FIG. 11A, a mirror portion (3 bytes) is formed in front of a header portion (here, Header1 field, Header2 field, Header3 field) composed of a synchronization pattern (VFO: 15 bytes) and an ID, and a servo pit is formed behind the header portion. It is. In Fig. 11B, the servo pit is formed in front of the header part, and the mirror part is formed behind the header part.

The servo pit may be configured in a pit pattern as shown in FIGS. 11A and 11B as well as a single pit. In addition, even if the above-described pit pattern is arranged in the center of the track (FIG. 10), it is possible to inform the belonging information of the sector or the information to which the land / groove track is switched. In addition, since the wobble signal output to the first channel and the second channel can be used to determine whether the track is a land or a groove, the present invention has an improved addressing structure.

Fig. 12 is a block diagram of an optical disk drive device according to the present invention, which includes a recording medium 102, a pickup section 104, an optical detector 118, first and second differential amplifiers 120 and 122, and a header data detector 124. And a user data detector 126, a low pass filter (LPF) 128, first and second wobble signal detectors 130 and 132, a header read and land / groove discriminator 134, and a servo controller 136.

The flow of the laser beam of the pick-up part 104 is emitted from the semiconductor laser 106 with a linear deflection beam having a deflection surface of an electric field parallel to the ground. Thus, a beam that is largely spread on an ellipse is converted into parallel light by a collimator (also called a coupling lens) 108.

In this way, the beam-shaped linearly polarized laser light having a polarization plane parallel to the ground is composed of an optical isolator composed of a beam splitter 110 and a quarter wave plate 112, and an objective lens 114. After passing through, it becomes circularly polarized light. Since the circularly polarized light is reflected by the disk as it is, it passes through the quarter wave plate 112 again, becomes linearly polarized light having a polarization plane in a direction perpendicular to the ground, and is reflected by the beam splitter 110 to collect a condenser lens (aka, detection). Also referred to as lens: 116). Here, the beam incident on the disk 102 may be a polarized beam or a beam that is not polarized.

The photo detector 118 divides the optical signal emitted through the condenser lens 116 to divide the two output signals I1 and I2 into the first and second differential amplifiers 120 and 122 and the header read and land / groove discriminator ( 134). Here, the photodetector may be configured not only as a two-segment photodiode but also as a detection sensor for dividing and detecting an optical signal.

The first differential amplifier 120 provides the result of the sum of the two output signals of the photo detector 118 to the header data detector 124 and the user data detector 126 through the first channel Ch1, and the second differential amplifier. Reference numeral 122 provides the result of subtracting the two output signals of the photo detector 118 to the second wobble signal detector 132 and the header read and land / groove discriminator 134 through the second channel Ch2.

The header data detector 124 detects the header data from the first channel Ch1 signal and provides it to the header read and land / groove discriminator 134.

The user data detector 126 detects user data from the first channel Ch1 signal and provides it to a reproduction signal processor (not shown), and the LPF 128 passes through the user data detector 126 to the first channel. Passes only the low band of the (Ch1) signal to provide to the first wobble signal detector (130). The first wobble signal detector 130 provides a wobble signal of a predetermined frequency detected in the first channel Ch1 to the header read and land / groove discriminator 134.

The second wobble signal detector 132 provides the header read and land / groove discriminator 134 with a wobble signal of a predetermined frequency detected in the second channel Ch2 provided from the second differential amplifier 122.

13 (a) to 13 (d) show a second channel Ch2 when the header structure proposed by the present invention is provided between the land sector and the groove sector or between the groove sector and the land sector as shown in FIG. The waveform of the header portion provided to the header readout and land / groove discriminator 134 is shown. 13A and 13B show a header and a servo in a groove sector and a land sector, respectively, when a mirror portion is provided in front of the header 10 and a servo pit is disposed behind the header 10. The pit waveform is shown.

13C and 13D show the header and servo in the groove sector and the land sector, respectively, when the servo pit is provided in front of the header 20 and the mirror part is arranged behind the header 20. The pit waveform is shown.

14 (a) to (d) shows a header read and land through the second channel Ch2 when the header structure proposed in the present invention has a header structure at the point where the land track and the groove track are connected as shown in FIG. The waveform of the header portion provided to the / groove discriminator 134 is shown. 14 (a) and 14 (b) show a header and a servo in a groove track and a land track, respectively, when a mirror portion is provided in front of the header 30 and a servo pit is arranged behind the header 30. Pit waveforms are shown. 14C and 14D show the header and servo pit waveforms when the servo pit is provided in front of the header 40 and the mirror portion is arranged behind the header 40. .

The header read and land / groove discriminator 134 provides the header data detected by the header data detector 124, the two split signals I1, I2 provided from the photo detector 118, and the second differential amplifier 122. The second channel (Ch2) signal can be read to recognize whether it is a land sector or a groove sector, and the land / groove switching information can be provided to the servo controller 136, and the first wobble signal for more reliable addressing. The wobble signal of the first channel Ch1 provided from the detector 130 and the wobble signal of the second channel Ch2 provided from the second wobble signal detector 132 are discriminated to determine land / groove switching information and the like. Provided at 136.

Thus, land / groove determination and recognition of lands and grooves in the header reader 134 are obtained from the photodetector 118 as well as the wobble signals of the first and second channels Ch1 and Ch2, the second channel Ch2 signals. It is also possible to distinguish between the I1 and I2 signals of the provided header, and a table in which signals according to the header structure and track wobble pattern according to the present invention are arranged is shown in FIG. 15.

As can be seen from FIG. 15, even if the sector number is the same, the track wobble signal can be used to determine whether it is a land or groove sector, and information can be obtained even when the physical track number is even or odd. That is, in one embodiment of the present invention (Fig. 7), if the current pickup tracks the groove track, the groove wobble signal is output to the first channel Ch1, and if the land track is tracked, the second channel Ch2 is detected. ), A land wobble signal is output. In addition, since the phases of the wobble patterns of the grooves and the land tracks are opposite to each other across one track, it is possible to determine whether the numbers of the grooves and the land tracks are the odd or the ordinal numbers to ensure the addressing. In addition, if the groove sector and the groove sector are connected, the I2 signal is prevalent, and the land sector and the land sector are connected, the I1 signal is dominant, and the land / groove switching area may be reversed to provide information for changing the tracking polarity.

The servo controller 136 uses the addressing information read from the header read and land / groove discriminator 134 to generate a servo control signal so that the pickup can move more stably to the desired physical area. The generated control signal is used to generate a reference signal for laser diode power correction using, for example, a pit and / or mirror read from the header read and land / groove discriminator 134, and a tracking offset correction using the read pit. And a track wobble signal, a pit position in the header, and / or a header signal to generate a land / groove switching control signal.

According to the present invention, the header is disposed at the boundary between the land and the groove track together with the track wobble structure, and the overhead and the servo pit and the mirror are arranged before or after the header area including the VFO area and the ID area. Therefore, the reliability of the system is improved by completely eliminating crosstalk.

The present invention is also advantageous in terms of manufacturing since the position of the beam forming the groove and the position of the beam forming the header are shifted in only one direction by 1/2 track pitch during header manufacture.

In addition, the present invention can correct the tracking offset using the pit or mirror, tilt and de-track correction can also be used with the pit signal, using the land wobble signal, groove wobble signal, the pit position of the header and the header signal Sector recognition in land and groove, and land / groove switching information can be provided all. In particular, the recognition of the land and the groove can be distinguished only by the header signals I1 and I2. When the wobble signals of the first channel and the second channel are used together, the land and groove sectors can be known even if the sector numbers are the same, and the physical track numbers can also be found to be odd or even.

Claims (23)

A header area indicating address information for a basic recording unit is composed of a physical identification area for identifying the basic recording unit and a physical pit area for servo control, And the synchronization pattern and the identification information of the recording basic unit are stored in the physical identification area, and the synchronization pattern and the identification information are arranged in the same order for each header area. delete The optical recording medium according to claim 1, wherein the header area is disposed at the boundary between the land and the groove, and the track width or the groove width is formed over one track pitch. 4. The optical recording medium as claimed in claim 3, wherein the physical pit area is alternately disposed in front of or behind the physical identification area alternately across the two track pitches in the radial direction. An optical recording medium according to claim 4, wherein a mirror portion is further disposed behind or in front of said physical identification area alternately across said two track pitches in a radial direction. The optical recording medium according to claim 5, wherein an optical power correction reference signal is obtained using the physical pit area and / or the mirror portion. 4. The apparatus of claim 3, wherein the physical identification area stores a synchronization pattern and identification information for the recording basic unit, alternates between the two track pitches, and once the synchronization pattern is placed first and then the identification information is stored. And an order in which the identification information is arranged first, and then the synchronization pattern is arranged next. The optical recording medium of claim 1, wherein the physical identification area is disposed at a boundary between land and groove, and the physical pit area is located at the center of the track. The optical recording medium of claim 1, wherein the physical pit area is disposed in front of the physical identification area. The optical recording medium of claim 1, wherein the physical pit area is disposed behind the physical identification area. The optical recording medium of claim 1, wherein the physical pit area is in a wobble pit pattern. 12. The apparatus of claim 11, wherein the information of the physical identification region and / or the wobble fit pattern indicate whether belonging to land or groove and / or whether land track to groove track or groove track to land track is converted. And obtaining land / groove switching information. The method of claim 12, wherein the wobble of the groove track is

Formed in out-of-phase so as to have a phase difference of?, The wobble of the land track is formed in-phase, and a track in which the wobble phases of the groove track and the land track are respectively in a radial direction; Filter

And the groove / land track number is an odd or ordinal number according to the wobble signal of the groove track and the wobble signal of the land track. 13. The wobble of claim 12, wherein the wobble of the land track is

It is formed in two phases so as to have a phase difference of. The wobble of the groove track is formed in phase, and the wobble phases of the land track and the groove track are each filtered in a radial direction.

And a groove / land track number is an odd or ordinal number according to the wobble signal of the groove track and the wobble signal of the land track. 12. The optical recording medium according to claim 11, wherein a control signal related to servo control is obtained by using the wobble pit pattern signal. An apparatus for driving an optical recording medium in which a header area representing address information is composed of a physical identification area and a physical pit area, wherein the header area is disposed at a boundary between a wobbled groove track and a phase above the wobbled land track: Detection means for detecting physical identification information and physical pit information, which are address information, from the optical recording medium on which pickup is tracking; And And control means for determining the physical identification information and the physical pit information to generate land / groove switching information, servo-related control information, and the like to control the addressing of the pickup. The method of claim 16, wherein the detecting means, An optical detector for dividing the optical signal reflected from the optical recording medium and outputting the divided signal; First and second calculators for providing a second channel signal corresponding to a difference between the first channel signal corresponding to the sum of the multi-divided signals and the multi-divided signal; A header data detector for detecting data of a header area from the first channel signal; And And first and second wobble signal detectors for detecting first and second wobble signals from the first and second channel signals. 18. The wobble of claim 17, wherein the wobble of the groove track is

The wobble of the land tracks is formed in phase, and the wobble phases of the groove tracks and the land tracks are radially filtered every other track.

Wherein the first wobble signal detector detects a groove wobble signal in a first channel, and the second wobble signal detector detects a land wobble signal in a second channel. 18. The wobble of claim 17, wherein the wobble of the land track is

It is formed so as to have a phase difference, the wobble of the groove track is formed in phase, and the wobble phase of the land track and the groove track are each filtered in a radial direction.

Wherein the first wobble signal detector detects a land wobble signal in a first channel, and the second wobble signal detector detects a groove wobble signal in a second channel. The method of claim 17, wherein the control means, A header read and a land / read that reads the header data and provides land and groove membership information and land / groove switching information from an output signal of the photodetector, a second channel signal and / or the first and second wobble signals Groove discriminator; And And a servo controller for generating servo related control information from the discriminating result of the discriminator and controlling the servo to move the pickup for addressing. 21. The apparatus of claim 20, wherein the header read and land / groove discriminator further determines whether the number of grooves / land tracks is an odd or ordinal number according to the first and second wobble signals. 18. The apparatus of claim 17, wherein a mirror unit is further disposed in the header area, and the control unit generates an optical power correction reference signal using the physical pit and / or the mirror unit, and uses the physical pit to control a servo control signal, And generating a tracking offset correction signal or a control signal for tilt and detrack correction, and generating a land / groove switching control signal using a track wobble signal, a physical pit position, and a header signal. A method for driving an optical recording medium in which a header area representing address information is composed of a physical identification area and a physical pit area, wherein the header area is disposed at a boundary between a wobbled groove track and a phase above the wobbled land track: (a) detecting physical identification information and physical pit information, which are address information, from the optical recording medium on which pickup is tracking; (b) determining the physical identification information and the physical fit information; And and (c) generating land / groove switching information and servo-related control information according to the determination result to control addressing of the pickup.

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