KR100878526B1 - Multi-layered Information Storage Media - Google Patents

Abstract

Disclosed is a multi-layered information storage medium having two or more information storage layers and improving the arrangement structure of the lead-in area and lead-out area of each information storage layer.

The disclosed multi-layered information storage medium is a multi-layered information storage medium having two or more information storage layers having a lead-in area, a user data area, and a lead-out area, wherein the lead-in area and lead-out of each information storage layer are provided. The areas are characterized in that they are arranged in different positions with respect to the radial direction.

In this way, the lead-in area and the lead-out area of each information storage layer are disposed at different positions with respect to the radial direction, so that even if scratches, fingerprints, or dust occur on the surface of the disc, the lead-in area or lead provided in each information storage layer is provided. At least one lead-in area or lead-out area of the out area is reproduced.

Description

Information storage medium having plural information storage layer

Fig. 1A shows a sector address structure of a conventional DVD-ROM two-layer optical disc.

FIG. 1B is a view showing a layout structure of lead-in and lead-out areas in the case of an OTP (Opposite Track Path) in a conventional DVD-ROM two-layer optical disc.

FIG. 1C is a view showing a layout structure of lead-in and lead-out areas in the case of an OTP (Opposite Track Path) in a conventional DVD-ROM 4-layer optical disc.

FIG. 2 is a diagram showing the arrangement of lead-in and lead-out areas in the case of a parallel track path (PTP) in a conventional DVD-ROM 4-layer optical disc.

3A to 3D are views illustrating various examples of arrangement of lead-in and lead-out areas in the case of an OTP (Opposite Track Path) in a two-layer information storage medium according to the present invention.

4A to 4D illustrate various examples of arrangement structures of lead-in and lead-out areas in the case of a parallel track path (PTP) in a two-layer information storage medium according to the present invention.

FIG. 5A illustrates an example of an arrangement structure of lead-in and lead-out areas in the case of an OTP (opposite track path) in a two-layer information storage medium according to the present invention.

5B is a diagram illustrating an example of an arrangement structure of lead-in and lead-out areas in the case of a parallel track path (PTP) in an information storage medium having two layers according to the present invention.

6 is a diagram showing the structure of a recording / reproducing area of each information storage layer in a multi-layered information storage medium according to the present invention.

7A is a diagram showing waveforms obtained from wobble due to frequency modulation employed in a multi-layered information storage medium according to the present invention.

7B is a diagram showing waveforms obtained from wobble due to phase modulation employed in a multi-layered information storage medium according to the present invention.

7C is a diagram showing waveforms obtained from wobble due to amplitude modulation employed in a multi-layered information storage medium according to the present invention.

7D is a diagram showing waveforms obtained from wobble by MAM modulation employed in a multi-layered information storage medium according to the present invention.

7E illustrates a QPSK scheme employed in a multi-layered information storage medium according to the present invention.

7F and 7G show waveforms obtained from various wobble modulation schemes employed in a multi-layered information storage medium according to the present invention.

<Explanation of symbols for main parts of the drawings>

L1 ... first information storage layer, L2 ... second information storage layer

L3 ... second information storage layer, L4 ... fourth information storage layer                 

1i, 2i, 3i, 4i ... lead-in area, 1o, 2o, 3o, 4o ... lead-out area Rin ... inner Rout ... outer

The present invention relates to a multi-layered information storage medium, and more particularly to a multi-layered information storage medium having two or more information storage layers and improving the arrangement of the lead-in and lead-out areas of each information storage layer. will be.

In general, an information storage medium is widely used as an information recording medium of an optical pickup apparatus that records / reproduces information in a non-contact manner. An optical disk, which is a type of information storage medium, is a compact disk (CD) or a digital disk according to an information recording capacity. It is divided into a digital versatile disk (DVD). In addition, optical discs capable of recording, erasing and reproducing include 650MB CD-R, CD-RW, 4.7GB DVD + RW, and the like. Furthermore, HD-DVDs with a recording capacity of 20GB or more are being developed.

As described above, optical discs are increasingly developed in a direction of increasing recording capacity. As a method of increasing the recording capacity, there is typically a method of shortening the wavelength of the recording light source and increasing the numerical aperture of the objective lens. In addition, there is a method of constituting a plurality of recording layers. A DVD-ROM having a plurality of recording layers is disclosed in US Pat. No. 5,881,032.

The sector address structure of a disc having a two-layer recording layer disclosed herein is shown in Fig. 1A. The disc is provided with a first recording layer L1 and a second recording layer L2, and each recording layer is provided with lead-in areas 1a and 2a and lead-outs 1b and 2b. In the first recording layer L1, the sector address X increases in the direction from the disk inner rim to the outer circumference Rout, and in the second recording layer L2, the disk inner circumference Rin at the disk outer circumference Rout. The sector address X 'is increased as it goes.

On the other hand, a multilayer optical disc having two or more recording layers is divided into an OTP (Opposite Track Path) and a PTP (Parallel Track Path) according to the direction of reproducing the information recorded on the disc. As shown in FIG. 1B, the OTP is reproduced from the inner circumference Rin of the first recording layer L1 to the outer circumference Rout, and then the inner circumference (Rout) of the second recording layer L2 is performed. Regeneration is performed in the Rin) direction. In other words, the OTP refers to a type in which the track spiral direction is alternately formed in the opposite direction for each recording layer. 1C shows a multilayer optical disc having first to fourth recording layers L1, L2, L3, and L4 in the case of OTP. In the first to fourth recording layers L1, L2, L3, and L4, first to fourth lead-in areas 1a, 2a, and 3a are alternately disposed between the inner and outer peripheral areas of the disc. (4a) and first to fourth lead-out areas 1b, 2b, 3b, and 4b are provided. In the reproduction direction of the four-layer optical disc, the inner circumference Rin of the first recording layer L1 to the outer circumference Rout, and then the outer circumference Rout of the second recording layer L2 to the inner circumference Rin, It is reproduced from the inner circumference Rin of the three recording layers L3 to the outer circumference Rout and from the outer circumference Rout of the fourth recording layer L4 to the inner circumference Rin.

FIG. 2 shows a two-layer optical disc of the PTP type, in which information is reproduced from the inner circumference Rin of the first recording layer L1 to the outer circumference Rout, and then the inner circumference of the second recording layer L2. Information is played back. In other words, it refers to a type in which the track spoiling direction is formed to be the same for each recording layer. Here, the first lead-in area 1a is provided on the inner circumferential side of the first recording layer L1, and the first lead-out area 1b is provided on the outer circumferential side, and the second lead is formed on the inner circumferential side of the second recording layer L2. The lead-in area 2a is provided with the second lead-out area 2b on the outer circumference side.

In the lead-in areas 1a (2a) 3a (4a) and lead-out areas (1b) (2b) (3b) and (4b), information about a disc is recorded. Several conditions are recorded together. Therefore, the user data can be normally recorded or reproduced only by reproducing the information recorded in these lead-in and lead-out areas.

By the way, in the arrangement structure of the lead-in area and the lead-out area of the conventional DVD-ROM, the lead-in area and lead-out area of each layer are the same in the radial direction of the disc and the lead-in area and the lead-out area of the different layer. Is placed on. As described above, when the lead-in area and the lead-out area of each layer are disposed at the same position with respect to the radial direction of the disc, dust or a user may be placed on the incident surface I of the disc corresponding to the lead-in area and the lead-out area. If contamination is caused by fingerprints or the like, it is highly likely that all the information recorded in the lead-in area or lead-out area of each layer cannot be reproduced. If the laser beam does not pass through the entrance surface due to contamination of the entrance surface corresponding to the lead-in area or the lead-out area, the lead-in area and the lead-out area of each layer are disposed at the same position with respect to the radial direction of the disc. This is because the lead-in area and the lead-out area of the other layer cannot be reached.                         

Therefore, in the case of a multi-layered optical disc as in the conventional DVD-ROM, if data recorded in the lead-in area or lead-out area of the first recording layer cannot be reproduced, it is recorded in the lead-in area or lead-out area of the other recording layer. Data can not be played back, and the defect rate of the disk is inevitably high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in a multi-layer optical disc having two or more information recording layers, the lead-in area and lead-out area of each layer are arranged at different positions with respect to the radial direction of the disc. It is an object of the present invention to provide a multi-layered optical disk that is configured to improve the responsiveness to contamination of the disk surface.

A multi-layered information storage medium according to the present invention is a multi-layered information storage medium having at least two information storage layers having a lead-in area, a user data area, and a lead-out area, in order to achieve the above object, each information storage medium. The lead-in area and the lead-out area of the layer are characterized in that they are disposed at different positions with respect to the radial direction.

At least one of the lead-in area and the lead-out area is provided with a play-only area in which play-only data is recorded in a pit shape.

At least one of the lead-in area and the lead-out area is provided with a read-only area in which read-only data is recorded in a groove wobble.

Hereinafter, a multi-layered information storage medium according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.                     

The multi-layered information storage medium according to the present invention has two or more information storage layers with reference to FIGS. 3A to 3D, each lead-in area 1i (2i) and user data area (1u) (2u). And lead-out regions 1o and 2o, wherein lead-in regions li 2i and lead-out regions 1o and 2o of each information storage layer are disposed at different positions with respect to the disc radial direction. It is characterized by.

3A to 3D illustrate various examples of an OTP (opposite track path) in two information storage media having a first information storage layer L1 and a second information storage layer L2.

3A illustrates a first lead-in area 1i at an inner circumference (Rin) side of the first information storage layer L1 and a first lead-out area 1o at an outer circumference (Rout) side of the first information storage layer L1. And a second lead-in area 2i disposed radially outward from the first lead-out 1o on the outer periphery Rout side of the second information storage layer L2, and including a second information storage layer (i). An example is provided with a second lead-out area 2o disposed radially outward from the first lead-in area 1i on the inner circumference Rin side of L2.

Alternatively, as shown in FIG. 3B, the region 1i which is the first lead on the inner circumference Rin side of the first information storage layer L1 and the first lead on the outer circumference Rout side of the first information storage layer L1 A second lead-in area 2i having an out area 1o and disposed outwardly in the radial direction from the first lead-out area 1o on the outer circumference Rout side of the second information storage layer L2. The second lead-out area 2o may be disposed on the inner circumference Rin of the second information storage layer L2 inward from the first lead-in 1i in the radial direction.

In another structure, as shown in FIG. 3C, the first lead-in area 1i is positioned on the inner circumference Rin side of the first information storage layer L1 and the outer circumference Rout of the first information storage layer L1 is shown. A second lead-in area having a first lead-out area 1o and disposed inward in the radial direction than the first lead-out area 1o on the outer circumference Rout of the second information storage layer L2 ( 2o) may include a second lead-out area 2o disposed radially outward from the first lead-in 1i on the inner circumference Rin of the second information storage layer L2.

In another structure, as shown in FIG. 3D, the first lead-in area 1i is positioned on the inner circumference Rin side of the first information storage layer L1, and the outer circumference Rout of the first information storage layer L1 is provided. A second lead-in area having a first lead-out area 1o and disposed outwardly in the radial direction than the first lead-out area 1o on the outer circumference Rout side of the second information storage layer L2 ( 2i) may include a second lead-out area 2o disposed inward from the first lead-in 1i in the radial direction on the inner circumference Rin of the second information storage layer L2.

4A to 4D illustrate various examples of reproducing along a PTP (Parallel Track Path) in an information storage medium having two layers having a first information storage layer L1 and a second information storage layer L2. will be.

4A illustrates a first lead-in area 1i on the inner rim side of the first information storage layer L1 and a first lead-out area 1o on the outer circumference Rout side of the first information storage layer L1. And a second lead-in area 2i disposed radially outwardly from the first lead-in area 1i on the inner circumference Rin side of the second information storage layer L2, the second information storage layer. The example which has the 2nd lead-out area | region 2o arrange | positioned outward with respect to the radial direction rather than the said 1st lead-out 1o on the outer periphery Rout side of L2 is shown.

Alternatively, as shown in FIG. 4B, the region 1i which is the first lead on the inner circumference Rin side of the first information storage layer L1 and the first lead on the outer circumference Rout side of the first information storage layer L1 A second lead-in area 2i having an out area 1o and disposed inward to the inner circumference Rin of the second information storage layer L2 in the radial direction from the first lead-in area 1i. The second lead-out area 2o may be disposed on the outer circumference Rout side of the second information storage layer L2 inwardly in the radial direction than the first lead-out 1o.

In another structure, as shown in FIG. 4C, the first lead-in area 1i is positioned on the inner circumference Rin side of the first information storage layer L1, and the outer circumference Rout side of the first information storage layer L1 is shown. A second lead-in area having a first lead-out area 1o and disposed outwardly in the radial direction from the first lead-in area 1i toward the inner circumference Rin of the second information storage layer L2 ( 2i) may include a second lead-out area 2o disposed inward from the first lead-out 1o in the radial direction on the outer circumference Rout side of the second information storage layer L2.

In another structure, as shown in FIG. 4D, the first lead-in area 1i is positioned on the inner circumference Rin side of the first information storage layer L1 and the outer circumference Rout side of the first information storage layer L1 is shown. A second lead-in area having a first lead-out area 1o and disposed inward with respect to the inner direction Rin of the second information storage layer L2 in the radial direction than the first lead-in area 1i ( 2i) may include a second lead-out area 2o disposed radially outward from the first lead-out 1o on the outer periphery Rout of the second information storage layer L2.

The above-described various examples are all made in that the positions of the first lead-in area and the first lead-out area and the positions of the second lead-in area and the second lead-out area are arranged at different positions with respect to the radial direction of the disc. Is common.

Meanwhile, the features of the present invention can be equally applied to an information storage medium having three or more information storage layers.

An example of a four layer information storage medium conforming to OTP is shown in FIG. 5A.

This four-layer information storage medium includes first to fourth information storage layers L1, L2, L3, and L4, and lead-in areas 1i, 2i, 3i, and 4i for each information storage layer. ), User data areas 1u (2u) 3u (4u) and lead-out areas 1o (2o) 3o (4o). Specifically, the first lead-in area 1i is disposed on the inner circumference Rin side of the first information storage layer L1, and the first lead-out 1o is disposed on the outer circumference side, and the second information storage layer L2 is disposed. The second lead-in 2i is radially outward from the first lead-out area 1o in the outer circumference of the first lead-out area 1o and the radius of the first lead-in area li is in the inner circumference of the second information storage layer L2. The second lead-out area 2o is disposed outward with respect to the direction. In addition, an area 3i which is a third lead outward in the radial direction from the second lead-out area 2o on the inner circumferential side of the third information storage layer L3 is located on the outer circumference of the third information storage layer L3. The third lead-out area 3o is disposed outward from the second lead-in area 2i in the radial direction, and the radius of the third lead-out area 3o is located at the outer circumference of the fourth information storage layer L4. The region 4i which is fourth lead outward with respect to the direction is located on the inner circumference of the fourth information storage layer L4, and the fourth lead-out region 4o which is outward with respect to the radial direction than the third lead-out region 3o. This can be arranged.

As another structure, referring to FIG. 5B, the four-layer information storage medium in the case of PTP includes first to fourth information storage layers L1, L2, L3, and L4, and includes first information. The first lead-in area 1i is disposed on the inner circumference Rin side of the storage layer L1, and the first lead-out area 1o is disposed on the outer circumference Rout side, and the inner circumferential side of the second information storage layer L2 is disposed above. The second lead-in area 2i is radially outward from the first lead-in area 1i in the radial direction than the first lead-out area 1o on the outer circumference of the second information storage layer L2. The second lead-out area 2o is disposed outward. In addition, the third lead-in area 3o is located on the inner circumferential side of the third information storage layer L3 in the radial direction outward from the second lead-in area 2i on the outer circumference side of the third information storage layer L3. The third lead-out area 3o is disposed outward from the second lead-out area 2o in the radial direction, and the radius of the third lead-in area 3i is greater than the third lead-in area 3i on the inner circumference of the fourth information storage layer L4. The fourth lead-out area 4o outward in the direction is radially outward from the third lead-out area 3o on the outer circumference of the fourth information storage layer L4. Is placed.

In the above example, the first to fourth lead-in areas 1i, 2i, 3i, and 4i are sequentially disposed outward with respect to the radial direction on the inner circumference of the disc, and the first to fourth lead-out areas 1o ( 2o) 3o and 4o are arranged outward with respect to the radial direction sequentially on the outer peripheral side of the disc.

In addition, the radius of each of the first to fourth lead-in regions 1i (2i) 3i and 4i and the first to fourth lead-out regions 1o, 2o, 3o, and 4o for each layer is different. The multi-layered information storage medium according to the present invention can be implemented in various ways arranged at different positions with respect to the direction. In addition, the information storage medium according to the present invention can be applied to both discs capable of recording and / or reproduction.

Meanwhile, as shown in FIG. 6, the multi-layered information storage medium according to the present invention includes a lead-in area, a user data area, and a lead-out area for each information storage layer, and includes at least one of the lead-in area and the lead-out area. The area may be provided with a read only area and a rewritable area.

In the read only area, for example, data may be recorded in a pit form or a groove wobble form.

The second groove wobble, wherein the lead-in area, the user data area, and the lead-out area have a groove wobble shape and is distinguished from the first groove wobble of the user data area in at least one of the lead-in area and the lead-out area. This formed area may be provided.

7A shows an example of a modulation method of the groove wobble signal according to the present invention. This modulation method stores data by changing the frequency of the wobble 105 (105 ') by frequency modulation. For example, data is recorded as a combination of bits "0" and "1", and the frequency of the wobble when the bit takes a logic "0" and the frequency of the wobble when the bit takes a logic "1". Data is recorded by doing differently, where the "0" bit and the "1" bit are recognized as the frequency at the "0" bit is greater than the frequency at the "1" bit.

As another example, there is a phase modulation scheme as illustrated in FIG. 7B. This is to record the data by changing the phase of the wobble 108, 108 ′. For example, data is recorded by changing the phase of the wobble when the bit takes the logic value "0" and the phase of the wobble when the bit takes the logic value "1". For example, data can be recorded by making a phase difference of 180 degrees out of phase of a wobble representing a "0" bit and a phase of a wobble representing a "1" bit.

In addition, as shown in FIG. 7C, there is an amplitude modulation scheme. For example, data is recorded by varying the amplitude of the wobble when the bit takes the logic value "0" and the amplitude of the wobble when the bit takes the logic value "1".

In addition, as shown in FIG. 7D, a method of recording data by a Modified Amplitude Modulation (MAM) method including a combination of a wobble unit 135 and / or a non-wobble unit 137 having a predetermined frequency in a predetermined period is provided. It is available. Here, the wobble unit 135 is configured of a single frequency, the non-wobble unit 137 is a portion where the wobble is not formed. Thus, for example, data may be recorded by varying the length of the wobble part 135 or the non-wobble part 137.

In addition, as shown in FIG. 7E, a method of recording by a QPSK (Qudarature Phase Shift Keying) method that modulates the phase of each wobble signal 140 by 90 ° may be used. Here, reference numeral 145 denotes a recording mark which is user data. In this manner, when recording the playback-only data by wobble, the user data and the playback-only data are stored together along the groove and / or the land track, thereby improving the use efficiency of the recording area of the disc.

Alternatively, as shown in FIG. 7F, a minimum shift keying (MSK) method of changing only a frequency of a portion of a continuous wobble or a sawtooth wobble having a sawtooth-shaped wobble 150 as shown in FIG. 7G. ) Can be adopted. The toothed wobble 150 has a "0" bit or a "1" bit depending on the shape of the portion 150a having a relatively high inclination and the portion 150b having a relatively low inclination.

The first groove wobble and the second groove wobble may be formed using the above-described modulation method of the groove wobble. For example, the first groove wobble and the second groove wobble are each a QPSK method, a frequency modulation method, an amplitude modulation method, a combination of a single frequency wobble of a predetermined period and a non-wobble part of a predetermined period, a phase modulation method, and an MSK method. And the first groove wobble and the second groove wobble can be formed by employing at least one of a sawtooth modulation method. In addition, the first groove wobble and the second groove wobble may employ different modulation schemes, respectively, and some of them may employ the same modulation scheme. Alternatively, the first groove wobble and the second groove wobble may have the same modulation scheme. For example, the first groove wobble and the second groove wobble may adopt a frequency modulation scheme in the same manner, but may be configured such that the frequency of the second groove wobble becomes relatively high frequency relative to the frequency of the first groove wobble.

As described above, in the multi-layered information storage medium according to the present invention, in the multi-layered information storage medium having two or more information storage layers, the lead-in area and the lead-out area of each layer are disposed at different positions with respect to the radial direction. As a result, at least one lead-in area or lead-out area of the lead-in area or the lead-out area included in each information storage layer is reproduced even if scratches, fingerprints, dusts, or the like appear on the disk surface. As a result, it is possible to reduce the defective rate of the information storage medium and to improve the recording / reproducing performance of data for the multi-layered information storage medium.

Claims (7)

In a multi-layered information storage medium having at least two information storage layers having a lead-in area, a user data area and a lead-out area, The lead-in area or lead-out area in the inner circumference of each information storage layer is disposed at different positions with respect to the radial direction of the information storage medium, and the lead-in area or lead-out area in the outer circumference of each information storage layer is the information storage medium. Multi-layered information storage medium, characterized in that arranged in different positions with respect to the radial direction of. The method of claim 1, And at least one of the lead-in area and the lead-out area is provided with a play-only area in which play-only data is recorded in a pit shape. The method of claim 1, And at least one of the lead-in area and the lead-out area is provided with a play-only area in which play-only data is recorded by groove wobble. The method of claim 1, The lead-in area, the user data area, and the lead-out area are formed in the shape of a groove wobble, and at least one of the lead-in area and the lead-out area has a second groove wobble different from the first groove wobble of the user data area. Multi-layered information storage medium, characterized in that the formed area. The method of claim 4, wherein  The first groove wobble and the second groove wobble each have a QPSK method, a frequency modulation method, an amplitude modulation method, a combination of a single frequency wobble of a predetermined period and a non-wobble portion of a predetermined period, a phase modulation method, an MSK method, and a sawtooth modulation. A multi-layered information storage medium, characterized in that it employs at least one of the methods. The method according to any one of claims 1 to 5, And information reproducing from an inner circumference to an outer circumference with respect to a radial direction in the information storage layer of each layer. The method according to any one of claims 1 to 5, And information reproducing from the inner circumference to the outer circumference and the outer circumference to the inner circumference with respect to the radial direction alternately for each information storage layer of each layer.

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