TW202333145A - Optical disc and optical disc device wherein the optical disc is provided with a plurality of recording layer having a groove track and a land track, and a wobbling - Google Patents

Abstract

The present invention relates to an optical disc and an optical disc device for recording or playing back data of the optical disc. The optical disc is provided with a plurality of recording layers, and each recording layer is provided with: a groove track formed by grooves; a land track formed between two adjacent groove tracks; and a wobbling provided at either the groove track or the land tract of the recording layer, and displays the physical address information in the recording layer. The optical disc allows a recording layer in which wobbling is provided in the groove track and a recording layer in which wobbling is provided in the land track to coexist.

Description

Optical discs and optical disc devices

This disclosure relates to an optical disc and an optical disc device.

As a technology for increasing the recording density per unit volume of an optical disc, there is a groove (groove)-groove (groove) recording and playback technology that increases the recording density of a track. This technology has been used in DVD-RAM to record data that was originally only recorded in the previous grooves or lands to both grooves and lands, thereby increasing the recording density of the track.

However, in DVD-RAM, since the data recording area and the address area are provided in the track, areas for independently demodulating data must be provided in the data recording area and the address area, and the utilization efficiency of the format will be reduced. Poor, resulting in wasteful use of recording area. In response to this problem, the following technology has been disclosed: in the laser exposure step included in the step of making a stamper that becomes a master disk of an optical disc, the laser is deflected in the radial direction during pattern formation, thereby making the groove Track wobbling is used to record physical address information without wasting data recording area (see Patent Document 1). Prior technical literature patent documents

Patent Document 1: International Publication No. 2013/140756

The problem to be solved by the invention

However, in order to increase the capacity of optical discs, it is necessary to increase the number of layers after increasing the capacity of each layer. In order to achieve this goal, it is necessary to prepare a large number of stampers that become master discs of optical discs, and it is required to increase the production capacity of the stampers. In addition, in order to obtain the best recording signal characteristics while being suitable for the configuration of the equipment for producing optical discs, it is also required to mix groove tracks and groove tracks formed on the surface of the optical disc in a cutting method.

The purpose of this disclosure is to be able to mix groove track cutting methods and groove land track cutting methods in one optical disc. means to solve problems

One aspect of the present disclosure provides an optical disc, which is an optical disc having a plurality of recording layers. The optical disc is characterized in that each recording layer has: a groove track formed by a groove; and a groove land track formed on adjacent between the groove tracks; and the swing is provided on any one of the aforementioned groove track or the aforementioned groove track of the recording layer, and displays the address information in the recording layer, and the aforementioned optical disc allows the aforementioned swing to be provided on the aforementioned groove The recording layer of the track is mixed with the recording layer wobbled on the land track. Invention effect

According to the present disclosure, a groove track cutting method and a land track cutting method can be mixed in one optical disc. By this, for example, it is possible to suppress the increase in productivity of the mastering step and to simplify the step.

Form used to implement the invention

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings as appropriate. However, more detailed explanations than necessary may be omitted. For example, detailed descriptions of well-understood matters and repeated descriptions of substantially the same components may be omitted. This is to prevent the following description from becoming unnecessarily lengthy so that it can be easily understood by those with ordinary knowledge in the technical field to which the present invention belongs. In addition, the attached drawings and the following description are provided so that those with ordinary knowledge in the technical field to which the present invention belongs can fully understand the present disclosure, and are not intended to limit the subject matter described in the patent application.

(This Embodiment) <Configuration of Optical Disc> The structure of the optical disc 10 of this embodiment will be described with reference to FIGS. 1 to 9 . FIG. 1 is a plan view showing an example of the optical disc 10 according to this embodiment. FIG. 2 is a cross-sectional view showing an example of the optical disc 10 according to this embodiment. The conceptual cross-sectional view shown in FIG. 2 is equivalent to a diagram that conceptually represents the A-A cross-sectional view of the optical disc 10 shown in FIG. 1 . FIG. 3 is a diagram showing an example of the wobble 23 in the optical disc 10 of this embodiment.

As shown in FIG. 2 , the optical disc 10 has a first surface 11 and a second surface 12 which is a surface opposite to the first surface 11 . In addition, the optical disc 10 has a plurality of recording layers L on the first side 11 and the second side 12 respectively. For example, as shown in FIG. 2 , on the first surface 11 , a recording layer L0 , a recording layer L1 , a recording layer L2 , a recording layer L3 , and a cover layer 14 are sequentially stacked on a substrate 13 made of polycarbonate. Similarly, on the second surface 12 , the recording layer L0 , the recording layer L1 , the recording layer L2 , the recording layer L3 , and the cover layer 14 are sequentially stacked on the substrate 13 . In addition, the recording layer L0 can also be interpreted as the first recording layer, the recording layer L1 can also be interpreted as the second recording layer, the recording layer L2 can also be interpreted as the third recording layer, and the recording layer L3 can also be interpreted as the fourth recording layer.

The structure of the optical disc 10 is such that the track pitch is 0.18 μm, the groove depth is 25 nm~35 nm, and the thickness from the laser incident surface to the information surface is approximately 50.5 μm~106.5 μm. Next, an example of an optical disc 10 with a recording capacity of 125 GB per recording layer and a multi-layered double-sided optical disc 10 will be described. The main optical conditions of the recording and playback device of the optical disc 10 are to use a laser with a wavelength of 405 nm and an object lens with NA=0.91, and the writing speed is a linear speed of 15.6 m/s. In addition, this linear speed is only an example and is not limited to this condition.

In each recording layer L of the optical disc 10, a track 20 is formed in a spiral shape from the inner circumference to the outer circumference (or from the outer circumference to the inner circumference). As shown in FIG. 2 , the track 20 is formed by a groove track 21 and a land track 22 . The groove track 21 is formed by a groove having a convex shape when viewed from the laser incident side. The track 20 is a land track 22 . 22 is formed between adjacent groove tracks 21 and has a concave shape when viewed from the laser incident side. Data is recorded on either the groove track 21 or the land track 22 . That is, the optical disc 10 records data in the groove track 21 and the land track 22 of each recording layer L.

As shown in FIG. 1 , the optical disc 10 has a BCA (Burst Cutting Area) 30 and a recordable area (not shown) on the first side 11 and the second side 12 in order from the inner circumference. As mentioned above, in the recordable area, data is recorded in the groove track 21 and the land track 22 of each recording layer L. In addition, as shown in FIG. 3 , the optical disc 10 is provided with a wobble 23 on either the groove track 21 or the land track 22 of each recording layer L, thereby recording physical information indicating the position information in the recording layer L. Address information. In addition, the details of the manufacturing method of the optical disc 10 including the formation method of the wobble 23 will be described later (refer to FIGS. 4 , 5 , and 6 ).

Information for managing the optical disc 10 is recorded in the BCA 30 . In addition, the details of the information recorded in BCA30 will be described later (see Figure 7).

＜Method of manufacturing optical disc＞ Next, an example of a method of manufacturing the optical disc 10 will be described with reference to FIGS. 4 , 5 , and 6 . FIG. 4 is a diagram showing an example of the manufacturing steps of the master stamper according to this embodiment. FIG. 5 is a diagram showing an example of the manufacturing steps of the mother stamper according to this embodiment. FIG. 6 is a diagram showing an example of the manufacturing steps of the optical disc according to this embodiment.

The optical disc 10 records physical address information in either the groove track 21 or the land track 22 in a predetermined pattern through exposure. The aforementioned physical address information shows the position information in each recording layer L.

Next, the manufacturing steps of the main stamper 604 will be described with reference to FIG. 4 .

First, as shown in FIG. 4(a) , the resist 602 applied on the substrate 603 is irradiated while deflecting the exposure laser 601 in the radial direction. Next, as shown in FIG. 4( b ), the resist 602 is developed to form a wobble 23 on either the groove track 21 or the land track 22 (see FIG. 3 ). Hereinafter, the method of arranging the oscillation 23 on the groove track 21 to record the physical address information is called the groove cutting method, and the method of arranging the oscillation 23 on the groove track 22 to record the physical address information is called the groove cutting method. Way.

Since the physical address information assigned to each recording layer L on the first side 11 and the second side 12 is different, the groove track must be mapped according to the number of recording layers L on both sides of the first side 11 and the second side 12 21 or trench track 22 for cutting. The concave portion shown in FIG. 4(b) represents the cut groove rail 21 or the groove rail 22, and both ends of either the groove rail 21 or the groove rail 22 meander synchronously. On the other hand, the remaining convex portions have portions in which both ends snake asynchronously.

When all the steps of manufacturing the master disc by groove cutting are combined with the disc production line that forms the recording layers L1 to L3 by imprinting, as shown in Figure 4 (c), by nickel electroforming To form the master stamper 604 that becomes the master. In addition, the main stamp can also be interpreted as the parent stamp.

Next, the manufacturing steps of the mother stamper 705 will be described with reference to FIG. 5 .

First, as shown in FIG. 5(a) , the resist 702 applied on the substrate 703 is irradiated while deflecting the exposure laser 701 in the radial direction. Next, as shown in FIG. 5( b ), the resist 702 is developed to form a wobble 23 on either the groove rail 21 or the land rail 22 (see FIG. 3 ). Next, as shown in FIG. 5(c) , a master stamper 704 serving as a master is formed by nickel electroforming.

Next, as shown in FIG. 5(d) , in conjunction with the steps of forming the recording layers L1 to L3, the concavities and convexities of the master stamper 704 are inverted and copied to form the master stamper 705.

Next, a method of manufacturing the optical disc 10 will be described with reference to FIG. 6 .

First, as shown in FIG. 6(a) , the substrate 801 is formed by inverting and replicating the concavities and convexities of the master stamper 604 by injection molding. The substrate 801 is a polycarbonate substrate and corresponds to the recording layer L0.

Next, as shown in FIG. 6(b) , the concavities and convexities of the master stamper 705 for the recording layer L1 formed in FIG. 5(d) are reversely copied by injection molding to form a stamper for the recording layer L1. Substrate 802. Then, using the stamp substrate 802 for the recording layer L1, an intermediate layer 803 corresponding to the recording layer L1 is formed by imprinting.

Next, as shown in FIG. 6(c) , the concavities and convexities of the master stamper 705 for the recording layer L2 formed in FIG. 5(d) are reversely copied by injection molding to form a stamper for the recording layer L2. Substrate 804. Then, using the stamp substrate 804 for the recording layer L2, an intermediate layer 805 corresponding to the recording layer L2 is formed by imprinting.

Next, as shown in FIG. 6(d) , the concavities and convexities of the master stamper 705 for the recording layer L3 formed in FIG. 5(d) are reversely copied by injection molding to form a stamper for the recording layer L3. Substrate 806. Then, using the stamp substrate 806 for the recording layer L3, an intermediate layer 807 corresponding to the recording layer L3 is formed by imprinting.

Next, as shown in FIG. 6(e) , a covering layer 808 is formed on the front surface. In this way, the disc on the first surface 11 side is formed. Cover layer 808 corresponds to cover layer 14 shown in FIG. 2 .

The disc on the 2nd side and 12th side is also produced using the same manufacturing method as in (a) ~ (e) of Figure 6 above.

Next, BCA is recorded on the disc on the first side 11 side and the disc on the second side 12 side respectively. Next, the disc on the first surface 11 side and the disc on the second surface 12 side are bonded together to form the optical disc 10 .

In addition, as a method of manufacturing the substrate 801, injection molding can also be used to form the mother stamper 705. In addition, when forming the substrate 801, the same imprinting method as the method for forming the intermediate layers 803, 805, and 807 can also be used. In addition, when forming the intermediate layers 803, 805, and 807, the main stamper 604 may be used.

In this embodiment, the master recording methods can be mixed. For example, if the recording layer L0 is implemented by the groove cutting method and the recording layers L1 to L3 are implemented by the groove cutting method, then the stamp manufacturing step is not required. The copying steps in (d) of Figure 5 can be unified in the steps shown in Figure 4 . For example, as shown in this embodiment, when the optical disc 10 is a disc with four layers on both sides, a total of eight stampers are produced. If the mothering step of FIG. 5(d) can be omitted when producing eight stampers, the productivity of stamper production can be greatly improved. Therefore, for a multi-layer optical disc with more than four layers on both sides, realizing an optical disc 10 in which the groove cutting method and the groove cutting method can be mixed will have a great effect in terms of productivity.

＜BCA format＞ Figure 7 shows an example of information recorded in BCA30. NBCA Unit Type, AB side identification information, version number, recorded data length, manufacturer number, media type ID information 901, cutting method information 902, and other information are recorded in BCA30. BCA30 can also be recorded on both sides of side 11 (A side) and side 2 12 (B side), or it can be recorded on only one side of side 11, or it can be recorded on only one side of side 2 12 . For both sides of the disc, since the upper and lower optical pickups of the optical disc device 200 (see FIG. 9 ) are synchronized for recording and playback, in principle, the media type IDs are recorded on the first side 11 and the second side 12 Information 901 and cutting method information 902 must be consistent. Therefore, the information about the recording mode of the master disk can be assigned to the BCA 30 only on either side, or the information about the recording sequence can be assigned to the BCA 30 on both sides. The advantage of providing only single-sided BCA30 with information about the recording sequence is an improvement in productivity. Although BCA30 is recorded in advance during the production of the disc, when the information about the recording method of the master disc is only recorded on one side of the disc, it can reduce the recording sequence related to the amount of one side. Information work hours.

In addition, the optical disc device 200 can also identify the cutting method by reading the media type ID information 901 shown in FIG. 7 . Thereby, the cutting method can be identified without changing the content of BCA30. That is, the BCA 30 can be given information for identifying the cutting method without consuming the reserved area.

FIG. 8A is a diagram showing a first example of cutting method information in this embodiment. FIG. 8B is a diagram showing a second example of cutting method information in this embodiment.

The cutting method information may also be data consisting of a number of bits corresponding to the number of recording layers L. Each bit value indicates that the corresponding recording layer L is a groove cutting method or a groove cutting method. In this embodiment, the bit value indicating the groove cutting method is set to "0", and the bit value indicating the groove land cutting method is set to "1". However, the bit value indicating the groove cutting method can also be set to "1", and the bit value indicating the groove land cutting method can be set to "0".

For example, when the recording layer L is 4 layers (L0~L3), the wobble information is composed of 4 bits. Furthermore, for example, when the recording layer L0 is of the land cutting method and the recording layers L1, L2, and L3 are of the groove cutting method, as shown in FIG. 8A , the cutting method information 902 of the BCA 30 is recorded as a binary number. "1000(Bin)" ("8(Hex)" in hexadecimal format).

The BCA 30 on the first side 11 records the cutting method information for each recording layer L on the first side 11 , and the BCA 30 on the second side 12 records the cutting method information on each recording layer L on the second side 12 .

Alternatively, the BCA 30 on the first side 11 may also record cutting method information for each recording layer L on both the first side 11 and the second side 12 . The BCA 30 on the second side 12 may also record cutting method information for each recording layer L on both the first side 11 and the second side 12 . In this case, the cutting method information may also have a bit value corresponding to each recording layer L on the first side 11 and a bit value corresponding to each recording layer L on the second side 12 . For example, when the recording layer L on the first side 11 is four layers from L0 to L3, and the recording layer L on the second side 12 is four layers from L0 to L3, as shown in Figure 8B, the cutting method information can also be obtained by It is composed of 8 bits. The first half 4 bits correspond to the recording layers L0~L3 of the first side 11, and the second half 4 bits correspond to the recording layers L0~L3 of the second side 12. For example, in the first side 11, the recording layer L0 is in the land-cutting mode, and the recording layers L1, L2, and L3 are in the groove-cutting mode, and in the second side 12, the recording layers L0 and L2 are in the land-cutting mode. , when the recording layers L1 and L3 are of the groove cutting method, as shown in Figure 8B, in the cutting method information of BCA30, "10001010 (Bin)" is recorded in binary digits ("8A in hexadecimal digits" (Hex)"). By recording the stamping method of each layer in BCA30, the manufacturing method suitable for each layer can be selected.

In addition, the cutting method information can also be recorded in the reserved area of the BCA30 format (that is, an area that has not yet been specified for use according to the BCA30 format). In this way, the cutting method information can be recorded to the BCA30 without newly changing or expanding the format of the BCA30.

In order to obtain better characteristics during data recording and/or playback, the optical disc 10 sometimes uses different materials (such as resin materials) in at least one recording layer L from other recording layers L. In such a case, which method of groove cutting or land cutting is used to obtain better characteristics when reading the physical address information from the wobble 23 will differ for each recording layer L. According to this embodiment, since the cutting method information can be recorded in the BCA 30 as described above, any optimal method of the groove cutting method or the groove land cutting method can be used for each recording layer L.

In addition, the recording layer L0, the recording layer L1, the recording layer L2, and the recording layer L3 may all be formed of a common material (for example, a resin material).

In addition, at least the recording layer L0 and the recording layer L2 may also have common physical address information. Alternatively, at least the recording layer L1 and the recording layer L3 may have common physical address information.

In addition, the recording layer L0 and the recording layer L2 may also have common physical address information, and the recording layer L1 and the recording layer L3 may also have common physical address information.

In addition, the recording layers L0 to L3 may all have common physical address information.

In addition, the recording layers L0 to L3 on the first side 11 and the recording layers L0 to L3 on the second side 12 may also have common address information.

＜Configuration of optical disc device＞ The structure of the optical disc device 200 of this embodiment will be described with reference to FIG. 9 . FIG. 9 is a block diagram showing a structural example of the optical disc device 200 of this embodiment.

The optical disc device records and plays data on the optical disc 10 . As shown in Figure 5, the optical disc device 200 includes an optical head 201, a spindle motor 202, a servo controller 203, a playback PLL (Phase Locked Loop) circuit 204, a data demodulation circuit 205, an error correction decoding circuit 206, and a thunder Emitter drive circuit 207, data modulation circuit 208, error correction coding circuit 209, wobble detection circuit 210, wobble PLL circuit 211, channel PLL circuit 212, address demodulation circuit 213, timing interpolation circuit 214, system controller 215 , I/F (Interface, interface) circuit 216, BCA playback circuit 218, and ROM (Read Only Memory) 219.

The spindle motor 202 rotates the optical disc 10 .

The optical head 201 irradiates the optical disc 10 with a light beam to record data onto the optical disc 10 . In addition, the optical head 201 irradiates the optical disc 10 with a light beam to play back the data recorded on the optical disc 10 .

The servo controller 203 controls the optical head 201 and the spindle motor 202 to focus and scan the light beam irradiated from the optical head 201 onto the optical disc 10 on a track provided on the optical disc 10, and to access the target track. Mobile controls. The servo controller 203 can also use the optical head 201 to scan the optical disc 10 at a fixed linear speed to control the position of the optical head 201 and the rotational speed of the spindle motor 202 .

The I/F circuit 216 receives data recorded on the optical disc 10 (hereinafter referred to as recorded data) from the host 217 . In addition, the I/F circuit 216 sends data played back from the optical disc 10 (hereinafter referred to as playback data) to the host 217 .

The error correction encoding circuit 209 adds a parity code for error correction to the recorded data received from the I/F circuit 216 .

The wobble detection circuit 210 identifies whether the recording layer to be played back in the optical disc 10 is a groove cutting method or a groove cutting method based on the cutting method information recorded in the BCA 30 . The wobble detection circuit 210 extracts a wobble signal based on the time period of the wobble 23 in the groove track 21 or the groove track 22 based on the recognition result. The optical disc 10 rotates relative to the optical head 201 . Therefore, the radial position of the track 20 facing the optical head 201 changes periodically in response to the spatial period of the swing 23 of the track 20 and the linear velocity of the track 20 of the optical disc 10 . The swing detection circuit 210 detects this periodic change as a waveform and outputs it as a swing signal. When the optical disc 10 rotates at a fixed linear speed, the inner circumference of the track 20 has a higher frequency of the wobble signal.

The wobble PLL circuit 211 generates a pulse signal corresponding to the frequency of the wobble signal and generates a wobble clock that further multiplies the frequency of the pulse signal by a predetermined factor. The frequency of the wobble clock, ie the number of pulses per unit time, is proportional to the spatial period of the wobble 23 of the track 20 . In addition, the number of pulses of the wobble clock corresponding to one piece of physical address information is fixed regardless of the radial position.

The address demodulation circuit 213 demodulates the physical address information from the wobble signal and the wobble clock.

The channel PLL circuit 212 is phase-synchronized with the wobble clock and generates a recording clock.

The timing interpolation circuit 214 determines the location where the recording data is recorded or the location where the playback signal is played based on the physical address information. The playback signal is a signal obtained by playing back the data (marks) recorded in the recording layer L.

The data modulation circuit 208 is synchronized with the recording clock generated by the channel PLL circuit 212. The recording data containing the parity code from the error correction encoding circuit 209 is processed according to a predetermined position in response to the specific position of the timing interpolation circuit 214. Modulation is performed based on the modulation principle, thereby converting the recorded data into a recording pattern recorded on the optical disc 10 .

In order to accurately form marks on the optical disc 10, the laser driving circuit 207 converts the recording pattern into light pulses and drives the laser of the optical head 201.

The playback PLL circuit 204 extracts a synchronization clock from the playback signal for demodulating the playback signal from the optical disc 10 .

The data demodulation circuit 205 demodulates the playback data from the playback signal in response to the position specified by the timing interpolation circuit 214 . Specifically, the data demodulation circuit 205 selects the closest expected value waveform from the signal amplitude comparison between the broadcast signal and the expected value waveform, and selects the original data that becomes the expected value waveform as the demodulation result.

The error correction decoding circuit 206 corrects and restores errors in the demodulated broadcast data.

The ROM 219 is composed of, for example, a flash memory. The ROM 219 memory system controller 215 is used to control the overall program of the optical disc device 200 .

The BCA playback circuit 218 plays the playback signal of the BCA30 to play the information recorded in the BCA30. Among the information recorded in BCA30, as mentioned above, at least the cutting method information is included.

The system controller 215 reads and executes the program stored in the ROM 219 to control various blocks and also controls communication with the host 217 .

The system controller 215 transmits the cutting mode information contained in the information recorded in the BCA 30 received from the BCA playback circuit 218 to the swing detection circuit 210 . Thereby, as described above, the wobble detection circuit 210 can identify whether the recording layer L of the playback target in the optical disc 10 is a groove cutting method or a groove cutting method based on the cutting method information.

The system controller 215 controls each part of the optical disc device 200 to record data according to the recording clock generated by the channel PLL circuit 212 and the recording position specified by the timing interpolation circuit 214 .

The data modulation circuit 208, the laser driving circuit 207, and the optical head 201 record data based on the recording clock and recording position.

According to the above configuration, the optical disc device 200 can play the cutting method information recorded in the BCA 30 to identify whether each recording layer L is a groove cutting method or a groove cutting method.

(Summary of this disclosure) The content of this disclosure can be expressed as follows.

＜Note 1＞ The optical disc 10 of the present disclosure has a plurality of recording layers L. Each recording layer L is provided with: a groove track 21 formed by a groove; a land track 22 formed between adjacent groove tracks 21; and a wobble 23 provided on the groove track 21 of the recording layer L. Or any one of the groove track 22, and displays the physical address information in the recording layer L. The optical disc 10 can also allow the recording layer L with the wobble 23 provided on the groove track 21 and the recording layer L with the wobble 23 provided on the land track 22 to coexist. In this way, an optical disc 10 can be realized, including: a recording layer L with a wobble 23 provided on the groove track 21 and a recording layer L with a wobble 23 provided on the land track 22 . For example, it is possible to provide an optical disc 10 in which the wobble 23 is provided on an optimal track of the groove track 21 or the land track 22 for each recording layer L.

＜Note 2＞ The optical disc 10 described in appendix 1 is provided with a BCA (Burst Cutting Area) 30 in which cutting method information is recorded. The cutting method information is displayed on the groove track 21 or the swing 23 in each recording layer L. Which one of the trench track 22. Thereby, the optical disc device 200 can identify which of the groove track 21 or the land track 22 the wobble 23 is located in each recording layer L from the wobble information recorded in the BCA 30 of the optical disc 10 .

＜Note 3＞ The optical disc 10 described in Appendix 2 includes a first surface 11 and a second surface 12 opposite to the first surface 11 . The first surface 11 and the second surface 12 each have a plurality of recording layers L. The BCA 30 records wobble information in each recording layer L on the first side 11 and wobble information in each recording layer L on the second side 12 . Thereby, the optical disc device 200 can identify which one of the groove track 21 or the land track 22 the wobble 23 is provided in each recording layer L of the first side 11 from the wobble information recorded in the BCA 30 of the optical disc 10, and In each recording layer L of the second surface 12, the wobble 23 is provided on either the groove track 21 or the land track 22.

＜Note 4＞ In the optical disc 10 described in Appendix 3, the BCA 30 on the first side 11 records the wobble information in each recording layer L of the first side 11, and the BCA 30 on the second side 12 records the wobble in each recording layer L of the second side 12. information. Thereby, the optical disc device 200 can identify which of the groove track 21 or the land track 22 the wobble 23 is arranged in each recording layer L of the first side 11 from the wobble information recorded in the BCA 30 of the first side 11 , and it is possible to identify which one of the groove track 21 or the land track 22 the wobble 23 is provided in each recording layer L of the second side 12 from the wobble information recorded in the BCA 30 of the second side 12 .

＜Note 5＞ In the optical disc 10 described in Appendix 3, the BCA 30 on one of the first side 11 or the second side 12 records wobble information in each recording layer L of the first side 11 and each recording layer L of the second side 12. Swing information in . Thereby, the optical disc device 200 can identify from the wobble information recorded in the BCA 30 on one of the first side 11 or the second side 12 that the wobble 23 in each recording layer L of the first side 11 is disposed on the groove track 21 Or which one of the land tracks 22 is provided, and which one of the groove track 21 or the land track 22 is the wobble 23 provided in each recording layer L on the second surface 12 .

＜Note 6＞ In the optical disc 10 described in any one of Supplementary Notes 1 to 5, among the plurality of recording layers L, at least one recording layer L is made of a material (for example, a resin material) that is different from the other recording layers L. Therefore, even if the reading characteristics of the wobble 23 are different for each recording layer L due to different materials, it is still possible to select a more suitable track among the groove track 21 or the land track 22 for each recording layer L. Set on swing 23.

＜Note 7＞ In the optical disc 10 described in any one of Supplementary Notes 1 to 5, the plurality of recording layers L may all be formed of a common material.

＜Note 8＞ In the optical disc 10 described in any one of appendices 1 to 7, the plurality of recording layers L are a first recording layer (L0), a second recording layer (L1), a third recording layer (L2), and a fourth recording layer. The recording layers (L3) are stacked in order, and at least the first recording layer and the third recording layer have common physical address information. Alternatively, at least the second recording layer and the fourth recording layer have the same physical address information. Thereby, the types of stampers used for arranging the swing 23 for displaying the physical address information on the recording layer L can be reduced.

＜Note 9＞ In the optical disc 10 described in any one of appendices 1 to 7, the plurality of recording layers L are a first recording layer (L0), a second recording layer (L1), a third recording layer (L2), and a fourth recording layer. The recording layers (L3) are stacked in order. The first recording layer and the third recording layer have the same physical address information, and the second recording layer and the fourth recording layer have the same physical address information. Thereby, the types of stampers used for arranging the swing 23 for displaying the physical address information on the recording layer L can be reduced.

＜Appendix 10＞ In the optical disc 10 described in any one of appendices 1 to 7, the plurality of recording layers L all have common physical address information. Thereby, the types of stampers used for arranging the swing 23 for displaying the physical address information on the recording layer L can be reduced.

＜Note 11＞ The optical disc 10 described in any one of appendices 1 to 7 includes a first surface 11 and a second surface 12 opposite to the first surface 11 . The first surface 11 and the second surface 12 each have a plurality of recording layers L. The plurality of recording layers L on the first side 11 and the plurality of recording layers L on the second side 12 have common physical address information. Thereby, the types of stampers used for arranging the swing 23 for displaying the physical address information on the recording layer L can be reduced.

＜Appendix 12＞ The optical disc device 200 that records or plays the optical disc 10 described in Appendix 2 is provided with a circuit (such as a BCA playback circuit 218 or a system controller 215). The aforementioned circuit identifies the wobble 23 in each recording layer L based on the wobble information recorded in the BCA 30 Which one is installed on the groove rail 21 or the groove platform rail 22? Thereby, the optical disc device 200 can identify which of the groove track 21 or the land track 22 the wobble 23 is located in each recording layer L from the wobble information recorded in the BCA 30 of the optical disc 10 .

The embodiments have been described above with reference to the attached drawings, but the present disclosure is not limited to these examples. Anyone with ordinary knowledge in the technical field to which the present invention belongs will obviously be able to conceive of various modifications, corrections, substitutions, additions, deletions, and equivalents within the scope described in the patent application, and be aware of such examples. It also belongs to the technical scope of this disclosure. Moreover, each component in the above-described embodiment may be combined arbitrarily within the scope that does not deviate from the gist of the invention. industrial availability

The present disclosure can be applied to optical discs that optically record data, and optical disc devices that record and play data on optical discs.

10: CD 11:Side 1 12:Side 2 13:Substrate 14: Covering layer 20: Orbit 21:Grooved track 22:Trench track 23:Swing 30:BCA 200: CD device 201: Optical head 202:Spindle motor 203:Servo controller 204:Play PLL circuit 205: Data demodulation circuit 206: Error correction decoding circuit 207:Laser drive circuit 208: Data modulation circuit 209: Error correction coding circuit 210: Swing detection circuit 211: Swing PLL circuit 212: Channel PLL circuit 213:Address demodulation circuit 214: Timing interpolation circuit 215:System Controller 216:I/F circuit 217:Host 218:BCA playback circuit 219:ROM 601: Exposure laser 602:Resist 603:Substrate 604: Main die 701: Exposure laser 702:Resist 703:Substrate 704: Main die 705:Female stamper 801:Substrate 802,804,806: Stamp substrate 803,805,807: Middle layer 808: Covering layer 901:Media type ID information 902: Cutting method information A-A: line L,L0,L1,L2,L3: recording layer

FIG. 1 is a plan view showing an example of an optical disc according to this embodiment. FIG. 2 is a conceptual cross-sectional view showing an example of the optical disc according to this embodiment. FIG. 3 is a diagram showing an example of wobble in the optical disc according to this embodiment. FIG. 4 is a diagram showing an example of the manufacturing steps of the master stamper according to this embodiment. FIG. 5 is a diagram showing an example of steps for manufacturing the mother stamper according to this embodiment. FIG. 6 is a diagram showing an example of the manufacturing steps of the optical disc according to this embodiment. FIG. 7 is a diagram showing an example of the BCA format according to this embodiment. FIG. 8A is a diagram showing a first example of cutting method information in this embodiment. FIG. 8B is a diagram showing a second example of cutting method information in this embodiment. FIG. 9 is a block diagram showing a structural example of the optical disc device according to this embodiment.

11:Side 1

12:Side 2

13:Substrate

14: Covering layer

20: Orbit

21:Grooved track

22:Trench track

L,L0,L1,L2,L3: recording layer

Claims (12)

An optical disc is an optical disc with multiple recording layers. The characteristics of the aforementioned optical disc are: Each recording layer has: Grooved track, formed by grooves; Trench rails formed between adjacent groove rails; and Swing, disposed on either the aforementioned groove track or the aforementioned groove track of the recording layer, and display the physical address information in the recording layer, The optical disc allows the recording layer wobbled on the groove track and the recording layer wobbled on the land track to coexist. For example, the optical disc of claim 1 further has a BCA (Burst Cutting Area) that records cutting mode information. The cutting mode information is displayed in each of the recording layers, and the swing is set on the groove track or the groove. Which one of the Taiwan tracks. Such as the optical disc of claim 2, which further has a first side and a second side opposite to the aforementioned first side, The aforementioned first side and the aforementioned second side each have a plurality of recording layers, The BCA records the cutting method information in each recording layer of the first side and the cutting method information in each recording layer of the second side. Such as the optical disc of claim 3, wherein the BCA of the first side records the cutting method information in each recording layer of the first side, The BCA on the second side records the cutting method information in each recording layer on the second side. The optical disc of claim 3, wherein the BCA of the first side or the second side records the cutting method information in each recording layer of the first side, and the cutting method information in each recording layer of the second side. method information. The optical disc of any one of claims 1 to 5, wherein among the plurality of recording layers, the material of at least one recording layer is different from that of other recording layers. The optical disc of any one of claims 1 to 5, wherein the plurality of recording layers are all formed of a common material. The optical disc according to any one of claims 1 to 5, wherein the plurality of recording layers are stacked in the order of a first recording layer, a second recording layer, a third recording layer, and a fourth recording layer, At least the aforementioned first recording layer and the aforementioned third recording layer have the aforementioned physical address information in common, Alternatively, at least the second recording layer and the fourth recording layer have the same physical address information. The optical disc according to any one of claims 1 to 5, wherein the plurality of recording layers are stacked in the order of a first recording layer, a second recording layer, a third recording layer, and a fourth recording layer, The aforementioned first recording layer and the aforementioned third recording layer have the same aforementioned physical address information, Furthermore, the second recording layer and the fourth recording layer have the same physical address information. An optical disc as claimed in any one of claims 1 to 5, wherein the plurality of recording layers all have the same physical address information. As claimed in any one of claims 1 to 5, the optical disc further has a first side and a second side opposite to the aforementioned first side, The aforementioned first side and the aforementioned second side each have a plurality of recording layers, The plurality of recording layers on the first side and the plurality of recording layers on the second side have the same physical address information. An optical disc device is an optical disc device that records or plays data on an optical disc such as claim 2, The optical disc device includes a circuit that identifies which of the groove track or the land track the wobble is provided in each recording layer based on the cutting method information recorded in the BCA.

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