WO2013180480A1

WO2013180480A1 - Information storage medium, information storage medium reproduction device, and information storage medium reproduction method

Info

Publication number: WO2013180480A1
Application number: PCT/KR2013/004747
Authority: WO
Inventors: 박상열; 타사카슈이치; 김재현; 안자이조지; 정갑균
Original assignee: 삼성전자 주식회사
Priority date: 2012-05-31
Filing date: 2013-05-30
Publication date: 2013-12-05

Abstract

Disclosed is an information storage medium. The information storage medium according to one embodiment of the present invention comprises one or more sequentially stacked disk layers. Each of said one or more disk layers includes a recording region for recording data and a layer identification region for identifying each disk layer. The length of the layer identification region formed in each of the one or more disk layers is different from each other in a track direction.

Description

Information storage medium, information storage medium reproducing apparatus and information storage medium reproducing method

The present invention relates to an information storage medium and a reproduction method thereof, and more particularly, to an information storage medium, an information storage medium reproducing apparatus, and an information storage medium for quickly and accurately reproducing data on an information storage medium in a recording medium having at least one disc layer. A medium playback method.

Generally, an optical information storage medium, for example, an optical disc, is widely used as an information storage medium of an optical pickup device for recording / reproducing information in a non-contact manner. Mainly, the information recording capacity is divided into compact discs, digital versatile discs and Blu-ray discs using blue laser light. The definition of high definition (HD) TVs from standard definition (SD) TVs to high definition (HD) TVs has been increasing, and the capacity of optical discs for video information is DVD-ROM, DVD-RAM, DVDR / RW, DVD + R / RW. It has a capacity of 4.7GB for single layer, 8.5GB for two layers, and BD-ROM / R / RE is developed for 25GB for single layer, 50GB for two layers, and BD-R for three layers. 100GB, 4 layers, 128GB, and BD-RE are available in 3 layers, 100GB capacity, and the 3D disk has a recording density of 33.3GB per layer and a 4GB disk with 32GB. It is realized.

On the other hand, the next-generation video contents are required to be developed for display devices and cameras corresponding to 4Kｘ2K, which have four times the resolution of HDTV, because the needs of video contents with high resolution and video display devices are increasing by responding to the large screen of the display apparatus. This is going on. These 4K images are also called Ultra High Definition (UHD) along with Super High Vision. In addition, video coding technologies such as MPEG2 and AVC / H264, which are used as Blu-ray discs, are also being developed as high efficiency video coding (HEVC) standards as next-generation technologies corresponding to UHD.

The amount of information of 4Kx2K video is four times that of Full HD. If the conventional video coding techniques such as MEPG2 and AVC / H264 are applied to 4K content, four times the recording capacity of Full HD is required.

Therefore, when HEVC, which is a next-generation video encoding technology, is applied, the compression efficiency is expected to be about twice that of AVC / H264, so that the amount of information can be compressed up to twice that of Full HD. In other words, the BD-ROM that records the current Full HD movie contents can record about 3 hours of video at 50GB, but it requires twice the capacity of 100GB when recording 4Kx2K video using HEVC. (See Fig. 1)

Since Blu-ray discs for recording already have capacities of 100 GB of BD-R / RE 3 layers and 128 GB of 4 BD-R layers, recording of HEVC-encoded video at 100 GB for about 3.2 hours and 128 GB for about 4.1 hours. However, since the BD-ROM exists only up to 50GB on the second floor, only about 1.6 hours of video can be recorded. In particular, most of the contents recorded on the ROM disc are movies, and movie recording time averages about 2 hours and nearly 3 hours. In the case of 3D compatible discs, the capacity is about 1.7 times that of 2D. There is a way to divide a movie title into two 50GB discs, but the user will have to change the disc, and because the content is relayed, it will hinder the immersion of the movie through the same high-quality video as in the theater. If possible, it is preferable to use one sheet. In order to record on one disc, a large capacity of the BD-ROM, that is, a ROM disc capacity of 100 GB or more is required. In this case, by constructing a BD-ROM with recording densities such as BD-R / RE 100GB and BD-R 128GB, since the optical structure of the existing playback apparatus hardly changes, the basic design of the apparatus can be configured in almost the same form. have.

The information storage medium reproducing apparatus has a learning function that obtains a good reproduction performance by learning servo control signals and recording states of each layer at startup, but it takes longer to drive a disc because the number of layers increases, which requires more driving time. You lose.

In the case of the existing Blu-ray Disc, since the layer information is included in the address information, the playback apparatus obtains the address information, so that it is possible to determine which layer is currently being reproduced. It was necessary to move the position of the collimator lens (CL) of the optical pickup so that the spherical aberration was the smallest in the layer. This requires time to drive the spectroscopic lens. In addition, it is necessary to perform tilt control so that the HF (High Frequency) signal amplitude is the largest. However, if it is determined that the target layer is not the target layer after the adjustment is completed, the controller moves to the remaining layer again and automatically adjusts the spherical aberration to be the minimum and the HF signal to the maximum. It takes time. That is, there was a problem that the floor information could not be instantly determined. Therefore, there is a need for a structure of an information storage medium and an information storage medium reproducing apparatus that can reproduce more quickly in an information storage medium having a multi-layer structure.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an information storage medium, an information storage medium reproducing apparatus, and an information storage medium for quickly and accurately reproducing data of an information storage medium in a recording medium having at least one disc layer. This is to provide a medium playback method.

An information storage medium according to an embodiment of the present invention for achieving the above object includes an at least one disk layer sequentially stacked in the information storage medium, each of the at least one disk layer is a data recording And a layer discrimination area for identifying each disc layer, wherein the lengths of the layer discrimination areas provided in each of the at least one disc layer are different from each other in the track direction.

In this case, the layer discrimination areas provided in each of the at least one disk layer may be formed on tracks having the same radius.

In addition, the layer discrimination area of each of the at least one disk layer may be configured as a continuous groove or a discontinuous groove.

In addition, the layer determination area of each of the at least one disk layer may be located in a protection zone.

In addition, the protection area may be located in the range of the inner circumference radius 22.2mm ~ 22.5mm of the information storage medium, or may be located in the range of the outer circumference radius 58.0mm ~ 58.5mm.

In addition, the layer determination area of each of the at least one disk layer may be located in a burst cutting area (BCA).

In this case, the BCA may be located in the range of 21.0 mm to 22.2 mm of the inner circumference of the recording medium.

Further, the layer discrimination area of each of the at least one disc layer may be a recording area or an unrecorded area.

In addition, when the layer determination region of each of the at least one disk layer is composed of discontinuous grooves, the length of the discontinuous grooves may be 2 mm or more, and the distance between the plurality of discontinuous grooves may be 1 mm or less.

In an information storage medium reproducing apparatus according to an embodiment of the present invention for achieving the above object, when an information storage medium including at least one disk layer provided with a layer discriminating area having a different length for each layer is mounted, Determining the length of the layer discriminating region to which the light is irradiated, based on an optical pickup unit for irradiating light to the discriminating region, a signal processing unit processing the reflected light reflected from the layer discriminating region, and a result of processing the reflected light; And a controller for determining the disk layer to which the light is irradiated according to the determined length of the layer determination region.

In this case, when the reproduction of the information storage medium is started, the optical pickup unit may first irradiate light to the layer discrimination area of the information storage medium.

The optical pickup unit may radiate light to a protection zone of the information storage medium.

The optical pickup unit may irradiate light to the burst cutting area (BCA).

The signal processor may process the reflected light reflected from the layer discriminating region of the information storage medium when at least one of a collimator lens control and an tilt control of the actuator is not performed. have.

In the information storage medium reproducing method, when an information storage medium including at least one disk layer having a different length layer discrimination area is provided for each layer, light is irradiated to the layer discrimination area to start focus control. Then, the reflected light reflected from the layer discrimination area is processed. The length of the layer discriminating region to which the light is irradiated is determined based on a result of the reflected light processing, and the disk layer to which the light is irradiating is determined according to the length of the determined layer discriminating region. Then, it is checked whether the determined disc layer is the target layer, and playback is started in the case of the target layer, but the layer is moved if it is not the target layer.

In this case, in the light irradiation step, when reproduction of the information storage medium is started, light may be first irradiated to the layer discrimination area of the information storage medium.

In the light irradiation step, light may be irradiated to a protection zone or burst cutting area (BCA) of the information storage medium.

In the signal processing step, the reflected light reflected from the layer determination region of the information storage medium in a state where at least one of tracking control, spectroscopic lens control, and tilt control of an actuator is not performed. Can be processed.

In addition, the layer discrimination areas provided in each of the at least one disc layer may be formed on tracks having the same radius as each other.

In addition, the signal processing step may process the reflected light reflected from the layer discrimination region of the information storage medium in a state where at least one of a collimator lens control and an actuator tilt control is not performed. Can be.

According to various embodiments of the present disclosure as described above, the present invention provides an information storage medium, an information storage medium reproducing apparatus, and an information storage medium reproducing apparatus for quickly and accurately reproducing data of an information storage medium in a recording medium having at least one disc layer. Provide a method.

1 is a table showing a storage capacity of an optical disc according to a resolution and a codec;

2 is a diagram showing recording time information of a Blu-ray Disc movie title;

3 is a block diagram showing a configuration of an information storage medium according to an embodiment of the present invention;

4 is a sectional view showing a configuration of an information area of each layer of the optical disc;

5 to 7 are cross-sectional views at the inner circumferential position of the information storage medium showing the layer discriminating area.

8 to 10 show an embodiment of each disc layer having layer determination regions of different lengths,

11 to 16 illustrate detection signal waveforms of a layer determination region according to various embodiments of the present disclosure;

17 is a block diagram showing an essential configuration of an information storage medium reproducing apparatus according to an embodiment of the present invention;

18 is a block diagram showing a detailed configuration of the information storage medium reproducing apparatus, and

19 is a flowchart illustrating a method of reproducing an information storage medium according to various embodiments of the present disclosure.

Hereinafter, various embodiments of the present disclosure will be described with reference to the accompanying drawings.

3 is a block diagram showing a configuration of an information storage medium 100 according to an embodiment of the present invention, FIG. 4 is a cross-sectional view showing the configuration of an information area of each layer of the optical disc, and FIGS. 4 to 6 are layers. It is sectional drawing in the inner peripheral position of the information storage medium 100 which shows the discrimination area.

The information storage medium 100 according to an embodiment of the present invention includes at least one

disk layer

110, 120, 130 sequentially stacked. The information storage medium 100 described herein may be a compact disc (CD: Compact Disc), a digital versatile disc (DVD: Digital Versatile Disc), a Blu-ray Disc (BD), or a Blu-ray ROM disc (BD-ROM). DISC) may be any one of various types of recording media. In addition, the present patent can be applied to various recording media using light not mentioned herein.

As described above, a disc having a capacity of 4.7 GB for a single layer and 8.5 GB for a second layer has been developed for a Blu-ray disc, and a 25 GB, 2 layer for a single layer for a playback-only Blu-ray disc (BD-ROM / R / RE). Discs with a capacity of 50 GB have been developed. By including at least one disk layer as described above, a large capacity of the recording medium is realized. In the present specification, for convenience of description, the description will be made based on a Blu-ray ROM disk. However, the inventive concept may be applied to other similar information storage media.

Each of the at least one

disk layer

110, 120, 130 is a

recording area

111, 121, 131 on which data is recorded and a

layer discriminating area

112, 122 for identifying each

disk layer

111, 121, 131. , 132). The

recording areas

111, 121, and 131 are physical areas for recording data on the disk layer surface, except for the layer discrimination area described later. Therefore, the conventional optical disc includes a data information area including address information.

In contrast, the

layer determination areas

112, 122, and 132 refer to physical areas on the information storage medium 100 for distinguishing each layer of the information storage medium 100 having a multilayer structure.

In an embodiment, the

layer determination areas

112, 122, and 132 may exist on a predetermined track of a Blu-ray ROM disk. For example, the layer discrimination area may be an area defined as a protection zone in the System Dectyption Blu-ray Disk Read-Only Format Basic Format Specification version 1.0 pre july 9th, 2004. Referring to FIG. 4, in the case of a Blu-ray ROM optical disc, a burn cutting area (BCA) 41 and a lead-in area 42 in which a media ID for copyright information is recorded in an inner zone, A lead-out area 43 exists in an outer zone, and a data zone 44 exists between the lead-in area 42 and the lead-out area 43. The Blu-ray ROM format standard defines a BCA area with a position of 21.0 mm to 22.2 mm in radius, and the PIC (Permanent Information Control Data) in which the disc management information is recorded is recorded in the lead-in area 42. The format standard defines the PIC region at a position of 22.5 to 23.2 mm (see Fig. 5).

5 shows a cross section of a multi-layered information storage medium 100 having four layers L0, L2, L3, and L4. Protection area 1 51 is located between the BCA and PIC area of the Blu-ray ROM disk as shown in FIG. The protected area 1 51 is an unrecorded area in which no data is recorded and corresponds to a reserved area.

When the layer discrimination region of the present invention is formed in the boundary region between the BCA and the PIC region, that is, the protection region 1 (51), the BCA has a radius of 21.0 mm to 22.2 mm and a PIC region of 22.5 to 23.2 mm. Therefore, the width of the layer discrimination region of the present invention can be configured within 0.3 mm, and the layer discrimination region can be formed without changing the capacity of the PIC region without being affected by the signal of the BCA. In the case of a multilayer layer structure, a layer discrimination area may be configured for each layer.

The protection region 3 is located between 58.0 mm and 58.5 mm in the outer circumference, but it is also possible to form a layer discrimination region in the protection region 3 61 as shown in FIG. That is, FIG. 6 shows sectional drawing when the layer discrimination area of the information storage medium 100 which has a four-layer disk layer is provided in the outer peripheral part. Since the outer periphery data area exists to a radius of 58 mm and the outer periphery side thus becomes a lead-out area, the layer discrimination area can be set in the range of 58.0 mm to 58.5 mm, which is the protection area 3 (61).

The Blu-ray ROM format standard defines a protection zone 2 in addition to the protection zone 1 and the protection zone 3 as described above. Therefore, although not shown in the above-described drawings, the protection region 2 may also be used as the layer discrimination region. As described above, the Blu-ray ROM format standard defines the protection area 1 as the range of the inner circumferential radius of the recording medium 22.2 mm to 22.5 mm, and the protection area 3 as the outer circumference radius 58.0 mm to 58.5 mm. In the embodiment of the present invention, since the layer discriminating area should have a sufficient width to stably enable optical focusing, the protection area 1 or the protection area 3 may be mainly used. However, the protection area 2 may be provided when a more precise optical focusing technology is provided. It may be used as a layer discrimination area.

However, in the present invention, since the layer discrimination region is not limited to the Blu-ray ROM format standard, when the recording medium is a type other than the Blu-ray ROM disk, the layer discrimination region may be located on the other type of information storage medium 100. Obviously, it can be located in an area corresponding to the protection areas 1 to 3 of the standard.

In another embodiment, a burst cutting area (BCA) according to the above-described Blu-ray ROM format standard may be used as the layer discrimination area. 7 illustrates such an embodiment.

7 is a sectional view of a recording medium having a four-layer disc layer according to an embodiment of the present invention having a layer discrimination area in a BCA area.

BCA is basically only in layer 0 (L0), but due to processing by a high-power laser, layers 1, 2, and 3 (L1, L2, L3) can also display the same area. The BCA is an area in which a BCA code for copy protection, including a media ID for copyright information, is recorded. When the BCA is used as the layer discrimination region, a pit for the layer discrimination region may be formed on all or part of the BCA. In this case, since the information storage medium reproducing apparatus does not need a separate operation for detecting the BCA signal after detecting the layer discrimination region pattern, the start time can be shortened. In other words, both signals can be detected simultaneously. In addition, since the BCA is an area of 21.0 mm to 22.2 mm in the inner circumference, a sufficient width for the layer discrimination area can be secured, thereby enabling accurate discrimination.

In the present invention, at least one disc layer may have layer discrimination areas of different lengths in the track direction. 8 to 10 are diagrams illustrating an embodiment of each disc layer having layer determination regions of different lengths.

As shown in Figs. 8 to 10, the information storage medium 100 according to the present invention includes at least one disc layer having layer discrimination areas of different lengths in the track direction, and the information storage medium reproducing apparatus includes the information storage medium ( The layer can be identified by identifying the length of each layer discrimination region of 100). That is, the information storage medium reproducing apparatus, which will be described later, determines the length of the layer discriminating region to which light is irradiated, and determines the disk layer to which the light is irradiated according to the determined length of the layer discriminating region. This method allows for fast and accurate floor discrimination, as described below. In particular, the floor discrimination process is performed in the step of performing servo control and no data decoding is performed, so that the floor discrimination can be performed quickly. The information storage medium reproducing apparatus accesses the recording area after performing layer discrimination. The operation of the information storage medium reproducing apparatus will be described later.

Fig. 8 shows the difference in track direction length of the layer discrimination area for each layer in the recording medium having a four-layer layer structure according to the present invention. As shown in FIG. 8, the track length of the L0 layer discrimination area is 0, the L1 layer discrimination area 80 is the track length is C1, and the track length of the L2 layer discrimination area 81 is C2, and the L3 layer discrimination area 82 is If the track length is C3, the relationship is C1 <C2 <C3. In this case, the shortest track length C1 may be formed to be 5 mm or more in order to distinguish it from damage caused by scratches or the like of the information storage medium 100.

FIG. 9 shows the difference in track direction lengths of the layer discrimination area for each layer in the recording medium when the layer discrimination area is formed in the BCA 90. FIG. As shown in FIG. 9, the track length of the L0 layer discrimination region is 0, the track length of the L1 layer discrimination region 91 is C1, and the track length of the L2 layer discrimination region 92 is C2, and the L3 layer discrimination region 93 is If the track length is C3, the relationship is C1 <C2 <C3. In this case, the shortest track length C1 may be formed to be 5 mm or more in order to distinguish it from damage caused by scratches or the like of the information storage medium 100.

Further, as described above, the layer discrimination region may be formed in some or all regions of the BCA 90. As shown in FIG. 9, the layer discrimination region may be set in a wider range than the BCA 90 in the outer circumferential radial direction. In the BCA, there is a gap area where the BCA code is not recorded, about 3 mm, but a layer discrimination area may be formed within the range where the gap area is gathered.

The above-described layer discriminating region may form a special pattern. The information storage medium reproducing apparatus judges the pattern of the layer discriminating area and discriminates the layer according to its length. In an embodiment, the above-described layer determination area may be formed as a pit. These grooves appear as sin waveforms in the HF signal waveform in the focus servo control situation. This makes it possible to identify the presence of a groove in the servo control phase. By binarizing this waveform, the section length can be obtained. The information storage medium reproducing apparatus performs layer discrimination by identifying the section length. This is described in more detail later.

Alternatively, the layer discrimination area may be left as an unrecorded portion instead of the recording pattern. In this case, an unrecorded section is detected as a layer discrimination area. Since Blu-ray ROM disks generally have a pit formed in the inner circumference thereof, it is possible to distinguish the recording area by not displaying a groove in the layer discrimination area.

In addition, the aforementioned groove may be formed discontinuously on the information storage medium 100. 10 shows an embodiment in this case.

10 is a diagram of an information storage medium 100 having a multi-layer disc layer structure in which layer discrimination regions are formed with discrete grooves. As shown in FIG. 10, the groove A1 may be formed at a predetermined interval A2. In the case of the discontinuous groove A1, a unique HF signal will be generated, thereby making it easier to identify the floor discrimination region. In an embodiment, the length of the discontinuous grooves may be 2 mm or more, and the distance between the plurality of discontinuous grooves may be 1 mm or less.

Since the distance A2 between the grooves A1 forms a block, the layer discrimination area may be configured based on the block. For example, in the L1 layer discrimination region, when the track length is 6 mm and the block length A2 is 1 mm, the five pieces are arranged in a row and the distance A2 of each block can be 0.2 mm. If the track length of the L2 layer discrimination area is 13 mm with blocks of the same length, 11 blocks can be arranged. If the track length of the L3 layer discrimination area is 19 mm, 16 blocks A1 with a track length of 1 mm can be configured. Can be.

Meanwhile, as illustrated in FIGS. 5 to 10, the layer discrimination areas provided in each of the at least one disc layer are formed on tracks having the same radius as each other. That is, the information storage medium reproducing apparatus starts layer discrimination from the same starting point on the track of the same radius on each disc layer. This structure allows for faster floor discrimination. That is, since the layer discrimination region exists at a certain position, the information storage medium reproducing apparatus starts reproduction at a predetermined position of the disc layer, and immediately enables layer discrimination.

Hereinafter, the detection signal waveform of the above-described layer determination region will be described.

11 to 16 illustrate detection signal waveforms of a layer determination area according to various embodiments of the present disclosure.

11 and 12 show HF signal waveforms when the information storage medium reproducing apparatus reproduces the layer discrimination area of the recording medium having the four-layer disc layer in the focus servo control state. 11 and 12, grooves are formed in the layer discrimination region. Since the track length of the L0 layer discrimination area is zero, the reproduction waveform shows the DC waveform as it is. However, in the L1 layer discrimination area, since a plurality of grooves are formed at a predetermined length, the sin waveform is detected as shown in FIG. 11. The region where no groove is formed becomes a simple DC waveform because no groove is present. The bin length T1 can be obtained by binarizing this waveform to the threshold Is1. Similarly, if the track length of the L2 layer discrimination region is binarized to obtain T2, and the track length of the L3 layer discrimination region is binarized to obtain T3, the relationship is T1 < T2 < T3. The layer discrimination becomes possible by the information storage medium reproducing apparatus identifying the section length of each layer. FIG. 12 shows the HF signal waveform after passing the HF signal through the low pass filter LPF, and binarization of the HF signal to the threshold Is2 makes it easier to determine each layer.

13 and 14 are HF signal waveforms when the information storage medium reproducing apparatus reproduces the layer discrimination region of the recording medium having the four-layer disc layer in the focus servo control state. In the embodiment of Figs. 13 and 14, the layer discrimination area is configured as unrecorded. 13 shows the HF signal waveform when the layer discriminating area of each layer of the four-layer disc is reproduced in the focus control state in the information storage medium reproducing apparatus. Since the L0 layer discrimination region is 0 and the grooves are formed in the region except the layer discrimination region, the entire signal has a sin waveform. Since the distance corresponding to the track length is unrecorded in the L1 layer discrimination region, the sin waveform is detected in the range in which the grooves are formed except the layer discrimination region, and the unrecorded portion in the layer discrimination region does not have any grooves. do. The bin length T1 can be obtained by binarizing this waveform to the threshold Is3. Similarly, if the track length of the L2 layer discrimination region is binarized to obtain T2, and the track length of the L3 layer discrimination region is binarized to obtain T3, the relationship is T1 < T2 < T3. The information storage medium reproducing apparatus performs layer discrimination by identifying the section length of each layer. Fig. 14 shows the HF signal waveform after passing the HF signal through the low pass filter LPF, and binarizing the HF signal with the threshold value Is4 makes it easier to determine each layer.

15 and 16 show HF signal waveforms when the information storage medium reproducing apparatus reproduces the layer discrimination area of the recording medium having the four-layer disc layer in the focus servo control state. 15 and 16, the layer discrimination region is formed on the BCA. When the layer discrimination region is formed on the BCA, the layer discrimination region can be configured as unrecorded.

Fig. 15 is an HF signal waveform when a layer discrimination area of each layer of a four-layer disc is reproduced in the focus servo control state by the information storage medium reproducing apparatus. Since the L0 layer discrimination region has a length of 0 and the region except the layer discrimination region is also unrecorded, no sin waveform or DC waveform is formed. Since the distance corresponding to the track length is unrecorded in the L1 layer discrimination region, the signal of the layer discrimination region becomes a DC waveform. On the other hand, since the BCA signal has a time width of about 10 m, the width of the BCA signal is negligible compared to the length of the layer discrimination area, so that detection is not a problem. The bin length T1 can be obtained by binarizing this waveform with the threshold Is5. Similarly, if T2 is obtained by binarizing the track length of the L2 layer discrimination region, and T3 is obtained by binarizing the track length of the L3 layer discrimination region, there is a relationship of T1 < T2 < T3. The information storage medium reproducing apparatus performs layer discrimination by identifying the section length of each layer. Similarly, FIG. 16 shows the HF signal waveform after passing the HF signal through the low pass filter LPF, and binarizing the threshold value Is6 makes it easier to determine each layer.

Hereinafter, the configuration and operation of the information storage medium reproducing apparatus 200 capable of reproducing the above-described information storage medium 100 will be described. However, the information storage medium reproducing apparatus 200, which will be described later, can also reproduce a conventional information storage medium having no layer discrimination area in addition to the information storage medium 100 described above. The compatibility problem of the information storage medium reproducing apparatus 200 will be described later.

17 is a block diagram showing an essential configuration of an information storage medium reproducing apparatus 200 according to an embodiment of the present invention.

Referring to FIG. 17, an information storage medium reproducing apparatus 200 according to an exemplary embodiment may include an optical pickup unit 205, a signal processor 250, and a controller 210.

The optical pickup unit 205 is configured to irradiate and reflect light onto a layer surface of an information storage medium and to sense reflected light. When the reproduction of the information storage medium starts, the information storage medium rotates in a non-contact state with the optical pickup unit 205, and the optical pickup unit 205 irradiates light onto the layer surface of the information storage medium. In particular, the optical pickup unit 205 irradiates light onto the layer discriminating region when the information storage medium including at least one disk layer provided with a layer discriminating region having a different length for each layer is mounted and rotated. When it is determined that the layer discrimination is completed and light is irradiated to the target layer, the optical pickup unit 205 irradiates light to the recording area of the same layer. However, if it is determined that it is not the target layer, the optical pickup unit 205 irradiates the light by changing the layer where the light is focused.

The signal processor 250 processes the reflected light reflected from the layer discrimination area. In detail, the signal processor 250 detects the intensity of the reflected light reflected from the layer determination region and generates and processes a corresponding electric signal. The signal processor 250 amplifies or equalizes the generated signal.

The controller 210 controls the overall operation of the information storage medium reproducing apparatus 200. The controller 210 determines the length of the layer determination region to which the light is irradiated based on a result of processing the reflected light in addition to driving of a motor, which will be described later. Specifically, as described above, the sin signal or the DC signal generated based on the reflected light to the layer discrimination region is binarized to calculate the length of the discrimination region. The operation may be substantially performed by the signal processor 250 under the control of the controller 210. The controller 210 determines the disk layer to which the light is irradiated according to the determined length of the layer determination region. When it is determined that the disc layer is the target layer, the optical pickup unit 205 sends a control signal to irradiate light to the recording area of the same layer. The control signal drives an actuator to be described later to adjust focusing, and to control a motor to adjust CL. However, if it is determined that the target layer is not the target layer, the optical pickup unit 205 is controlled to irradiate the light by changing the layer on which the light is focused.

Hereinafter, the reproduction operation will be described with reference to the detailed configuration of the information storage medium reproducing apparatus 200.

18 is a block diagram showing the detailed configuration of the information storage medium reproducing apparatus 200. As shown in FIG.

When the information storage medium 100 is mounted, the rotating shaft of the information storage medium reproducing apparatus 200 fixes and rotates the information storage medium 100. In addition, the controller 210 drives the laser driver 220, and the laser driver 220 supplies a current to a laser diode (not shown) to emit laser light. The emitted laser light passes through a beam splitter (not shown), passes through a polarizing beam splitter (not shown), passes through a retarder film, and changes polarization to enter the objective lens 280. The objective lens 280 focuses incident light on the surface of the information storage medium.

Initially, at the stage in which information storage medium reproduction starts, laser light may be irradiated to the layer discrimination area. In this case, the light reflected from the information storage medium passes through the retarder film again, is reflected through the polarization beam splitter, and enters the photo detector (not shown). The photo detector generates an electrical signal by detecting the intensity of the reflected light and provides the signal to the signal processor 250. The signal processor 250 performs necessary signal processing such as amplification or equalization on the received electric signal. The signal processor 250 generates a servo control signal, particularly a focusing error signal, and provides feedback to the controller 210. The controller 210 drives the actuator 270 and performs focusing control based on the signal. When the focusing control is performed, the controller 210 determines the length of the layer determination region to which light is irradiated based on the result of the reflected light processing in the same manner as described above. In other words, the sin signal or the DC signal generated on the basis of the reflected light to the layer discrimination region is binarized to calculate the length of the discrimination region. The operation may be substantially performed by the signal processor 250 under the control of the controller 210.

In this case, as described in the description of the information storage medium, the layer determination area may be a protection zone or a burst cutting area (BCA) of the multilayer information storage medium.

On the other hand, typically emitted laser light is reflected to the power detector 230 in a beam splitter (not shown). The power detector 230 converts the detected power into a voltage and provides the power to the controller 210, and the controller 210 generates a driving signal of the motor 240 based on the power detector 230. The motor 240 moves a collimator lens (CL) according to the driving signal. In addition, the above-described actuator 270 controls the tilt so that the amplitude of the HF signal is the maximum. However, the present invention initially performs layer discrimination without irradiating light to the layer discrimination region without performing spectroscopic lens control or tilt control. That is, since the layer discrimination area is formed with a groove or unrecorded, the length detection of the layer discrimination area is performed using only the signal read out from the reflected light in the state of focusing control only. Therefore, the detection time of the layer discrimination region proceeds very quickly.

On the other hand, the information storage medium reproducing apparatus 200 of the present invention irradiates a laser beam to a region of the conventional information storage medium corresponding to the layer discriminating region even when an information storage medium which does not include the layer discriminating region is mounted. However, the area of the conventional information storage medium may have the same length for each layer even if the groove is not formed as a reserve area or if it is configured as an unrecorded area. In this case, the floor cannot be determined only by the above-described process. In the information storage medium reproducing apparatus 200 of the present invention, when the layer discrimination is impossible in the above-described process, that is, when the length of the layer discrimination region is the same in the track direction or no groove is formed in the region, the multilayer information storage medium The structure of the information storage medium reproducing apparatus 200 described above is controlled to read address information from the recording area of the apparatus. For example, the controller 210 reads the disc information area by performing servo control, tilt control, spectroscopic lens control, and the like. Then, data is read out from the information area and decoded. Based on this information, the address of the recording area is found and playback is started. As described above, the apparatus for reproducing an information storage medium of the present invention can reproduce a conventional information storage medium other than the information storage medium according to the above-described embodiments of the present invention.

Hereinafter, a method of reproducing an information storage medium according to various embodiments of the present disclosure will be described.

Referring to FIG. 19, in the information storage medium reproducing method, when an information storage medium including at least one disc layer having different length layer discrimination areas is provided for each layer (S1910), light is irradiated onto the layer discrimination area. The focus control starts (S1920). Then, the reflected light reflected from the layer discrimination region is processed (S1930). The length of the layer discrimination region to which the light is irradiated is determined based on a result of the reflected light processing, and the disk layer to which the light is irradiated is determined according to the length of the determined layer discrimination region (S1940). Then, it is checked whether the determined disc layer is the target layer (S1950), and if it is the target layer, playback starts (S1970), but if it is not the target layer, the layer is moved (S1960).

Meanwhile, the above-described information storage medium reproducing method may be stored in the form of a program in a non-transitory information storage medium readable on a computer. Here, the non-transitory readable medium refers to a medium that can store data semi-permanently and can be read by an electronic device, not a medium that stores data for a short time such as a register or a cache. For example, it may be a CD, a DVD, a hard disk, a Blu-ray disk, a USB, a memory card, a ROM, or the like. In particular, the above-described information storage medium reproducing method may be provided embedded in a hardware IC chip in an embedded software form, and may be included in each component including the controller 210 of the above-described information storage medium reproducing apparatus 200.

While the above has been shown and described with respect to preferred embodiments of the invention, the invention is not limited to the specific embodiments described above, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

Claims

In the information storage medium,

At least one disk layer sequentially stacked;

Each of the at least one disc layer includes a recording area in which data is recorded and a layer discrimination area for identifying each disc layer,

And a length of the layer discrimination area provided in each of the at least one disk layer is different in a track direction.
The method of claim 1,

And the layer discrimination area provided in each of the at least one disk layer is formed on a track having the same radius as each other.
The method of claim 1,

And the layer discrimination area of each of the at least one disk layer is composed of continuous grooves or discontinuous grooves.
The method of claim 1,

And the layer discrimination area of each of the at least one disk layer is located in a protection zone.
The method of claim 4, wherein

The protection area is located in the range of the inner circumference radius 22.2mm ~ 22.5mm of the information storage medium, or the information storage medium, characterized in that located in the range of 58.0mm ~ 58.5mm outer circumference.
The method of claim 1,

And a layer discrimination area of each of the at least one disk layer is located in a burst cutting area (BCA).
The method of claim 7, wherein

The BCA is an information storage medium, characterized in that located in the range of 21.0mm ~ 22.2mm inner circumference of the recording medium.
The method of claim 1,

And the layer discriminating area of each of the at least one disk layer is a recording area or an unrecorded area.
The method of claim 3,

When the layer discrimination area of each of the at least one disk layer is composed of discrete grooves,

The length of the discontinuous groove is more than 2mm, the distance between the plurality of discontinuous grooves is formed in less than 1mm information storage medium.
An optical pickup unit for irradiating light to the layer discriminating area when an information storage medium including at least one disk layer provided with a layer discriminating area having a different length for each layer is mounted;

A signal processor which processes reflected light reflected from the layer discriminating area; And

And a controller configured to determine a length of the layer discriminating region to which the light is irradiated based on a result of the reflected light, and to determine a disk layer to which the light is irradiated according to the determined length of the layer discriminating region. Media playback device.
The method of claim 10,

The optical pickup unit,

And when the reproduction of the information storage medium starts, preferentially irradiating light to the layer discrimination area of the information storage medium.
The method of claim 10,

The optical pickup unit,

And irradiating light to a protection zone of the information storage medium.
The method of claim 10,

The optical pickup unit,

And irradiating light to the burst cutting area (BCA).
The method of claim 10,

And the layer discrimination areas provided in each of the at least one disc layer are formed on tracks having the same radius as each other.
The method of claim 10,

And the layer discrimination area of each of the at least one disc layer is composed of continuous grooves or discontinuous grooves.