Optical disc and information reading method thereof

Abstract

The invention discloses an optical disc and an information reading method thereof, the optical disc comprises a guide layer, the guide layer comprises a shore track, the shore track comprises a first recording point and a second recording point which are different in length, and the first recording point and the second recording point are used for representing address information of the shore track so as to improve the storage density of the optical disc.

Description

Technical Field

[0001] The present application relates to the field of storage technology, and in particular to an optical disc and an information reading method thereof. Background Art

[0002] At present, a pre-pressed wobble groove is generally used on the guide layer of an optical disc to achieve the purpose of servo guidance, and the data recording position is located by modulating address information on the wobble groove.

[0003] In order to further improve the recording density, the idea of ​​using both the groove track and the land track to record information was proposed. However, since the guide layer of a blank recordable disc without data is physically together with the recording layer and only one laser beam is used, and the land track shares two adjacent groove tracks, the groove track is on a spiral involute, and the basic unit physical length of the swing is fixed, so the swing of the groove tracks at different radii cannot be aligned. If the land track is used directly for guidance, it will not only affect the tracking servo, but also fail to decode the address information on the land track. Summary of the invention

[0004] The present application provides an optical disc and an information reading method thereof, which can improve the storage density of the optical disc.

[0005] In a first aspect, the present application provides an optical disc, comprising a guide layer, the guide layer comprising a land track, the land track comprising a first recording point and a second recording point of different lengths, the first recording point and the second recording point being used to represent address information of the land track.

[0006] In a single-guide-layer optical disc structure, a pre-pressed wobble groove is generally used to achieve the purpose of servo guidance, and the data recording position is located by modulating the address information on the wobble groove. In order to further improve the recording density of the optical disc, the present application sets a first recording point and a second recording point of different lengths on the land track of the optical disc, so that when the laser is irradiated to the land track, the address information of the land track can be determined according to the first recording point and the second recording point, and the direct guidance of the land track is realized, thereby further compressing the track distance of the guide layer and improving the storage density of the optical disc. In addition, since the structure of the optical disc is a single-guide layer, the guide layer and the recording layer are physically separated. Therefore, recording information on the guide layer by using recording points will not interfere with the reading of information on the recording layer.

[0007] In a possible implementation, the length of the first recording point is two-thirds of the length of the second recording point.

[0008] In this implementation, the first recording point on the land track is set to two-thirds of the length of the second recording point, so that when the laser irradiates the first recording point and the second recording point, different signal frequencies are output respectively, thereby decoding the corresponding address information on the land track based on the change in frequency.

[0009] In a possible implementation, the first recording point is a pit or a protrusion.

[0010] In a possible implementation, the second recording point is a pit or a protrusion.

[0011] In a possible implementation, the land track further includes a third recording point, the length of the third recording point is different from the lengths of the first recording point and the second recording point, and the first recording point, the second recording point and the third recording point are used to represent address information of the land track.

[0012] In this implementation, a third recording point different from the first recording point and the second recording point can also be used on the land track to record the address information of the land track, so as to encode and decode the address information based on the frequency changes of the optical signals fed back from multiple recording points.

[0013] In a second aspect, the present application provides a method for reading information from an optical disc, wherein the optical disc comprises a guide layer, the guide layer comprises a land track, the land track comprises a first recording point and a second recording point of different lengths, the first recording point and the second recording point are used to represent address information of the land track, and the method comprises:

[0014] Acquire a first light signal reflected by the laser at the first recording point and a second light signal reflected at the second recording point;

[0015] converting the first optical signal and the second optical signal into a first electrical signal and a second electrical signal respectively;

[0016] Address information of the land track is determined according to the first electrical signal and the second electrical signal.

[0017] In the present application, the present application sets a first recording point and a second recording point of different lengths on the land track of the optical disc, so that when the laser is irradiated to the land track, the address information of the land track can be determined according to the first recording point and the second recording point, thereby realizing direct guidance of the land track. When the laser is irradiated to the land track, the first light signal and the second light signal respectively reflected by the first recording point and the second recording point can be obtained, and then the address information on the land track is decoded based on the first electrical signal and the second electrical signal respectively converted from the first optical signal and the second optical signal, and the address information on the optical disc is read.

[0018] In a possible implementation, determining the address information of the land track according to the first electrical signal and the second electrical signal includes:

[0019] Determine the values ​​of the information bits corresponding to the first electrical signal and the second electrical signal according to the frequency changes corresponding to the first electrical signal and the second electrical signal respectively;

[0020] The address information of the landing track is decoded according to the value of the information bit.

[0021] In this implementation, after the laser is irradiated onto the shore track, the values ​​of the information bits corresponding to at least one first recording point and at least one second recording point can be determined based on the frequency changes of the first electrical signal and the second electrical signal corresponding to the feedback first optical signal and the second optical signal, respectively, to further decode the address information on the shore track.

[0022] In a possible implementation, the length of the first recording point is two-thirds of the length of the second recording point.

[0023] In a possible implementation, the first recording point is a pit or a protrusion.

[0024] In a possible implementation, the second recording point is a pit or a protrusion.

[0025] In a possible implementation, the land track further includes a third recording point, the length of the third recording point is different from the lengths of the first recording point and the second recording point, the first recording point, the second recording point, and the third recording point are used to represent address information of the land track, and the method further includes:

[0026] Acquiring a third optical signal reflected by the laser at a third recording point;

[0027] converting the third optical signal into a third electrical signal;

[0028] Address information of the land track is determined according to the first electrical signal, the second electrical signal and the third electrical signal.

[0029] In a third aspect, the present application provides an information reading device for an optical disc, wherein the optical disc comprises a guide layer, the guide layer comprises a land track, the land track comprises a first recording point and a second recording point of different lengths, the first recording point and the second recording point are used to represent address information of the land track, and the device comprises:

[0030] A signal acquisition module, used to acquire a first light signal reflected by the laser at the first recording point and a second light signal reflected by the laser at the second recording point;

[0031] A signal conversion module, used to convert the first optical signal and the second optical signal into a first electrical signal and a second electrical signal respectively;

[0032] The information determination module is used to determine the address information of the land track according to the first electrical signal and the second electrical signal.

[0033] In a possible implementation, the information determination module is used to:

[0034] Determine the values ​​of the information bits corresponding to the first electrical signal and the second electrical signal according to the frequency changes corresponding to the first electrical signal and the second electrical signal respectively;

[0035] The address information of the landing track is decoded according to the value of the information bit.

[0036] In a possible implementation, the length of the first recording point is two-thirds of the length of the second recording point.

[0037] In a possible implementation, the first recording point is a pit or a protrusion.

[0038] In a possible implementation, the second recording point is a pit or a protrusion.

[0039] In a possible implementation, the land track further includes a third recording point, the length of the third recording point is different from the lengths of the first recording point and the second recording point, the first recording point, the second recording point, and the third recording point are used to represent address information of the land track, and the information determination module is further used to:

[0040] Acquiring a third optical signal reflected by the laser at a third recording point;

[0041] converting the third optical signal into a third electrical signal;

[0042] Address information of the land track is determined according to the first electrical signal, the second electrical signal and the third electrical signal.

[0043] In a fourth aspect, the present application provides a computer program product, which, when executed by a computer, implements the method in the above-mentioned second aspect or any possible implementation manner of the second aspect.

[0044] In a fifth aspect, the present application provides a chip system, which includes a controller for implementing the method in the second aspect or any possible implementation of the second aspect. In one possible design, the chip system also includes a memory for storing program instructions and / or data. The chip system can be composed of a chip, or can include a chip and other discrete devices.

[0045] In a sixth aspect, the present application provides an optical disc system, which includes at least one optical disc according to the first aspect or any possible implementation of the first aspect.

[0046] The solutions of the second to sixth aspects mentioned above are used to implement or cooperate with the method in the first aspect or any possible implementation method thereof, and therefore can achieve the same or corresponding beneficial effects as the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1a A schematic diagram of the structure of an optical disc system provided in an embodiment of the present application;

[0048] Figure 1b A schematic diagram of the structure of an optical disc;

[0049] Figure 1c is another structural schematic diagram of an optical disc;

[0050] Figure 2a A schematic diagram of the structure of a guide layer of an optical disc provided in an embodiment of the present application;

[0051] Figure 2b A partially enlarged structural schematic diagram of a guide layer of an optical disc provided in an embodiment of the present application;

[0052] Figure 3 A schematic diagram of a first recording point and a second recording point provided in an embodiment of the present application;

[0053] Figure 4 A schematic diagram of a third unit provided in an embodiment of the present application;

[0054] Figure 5 A schematic diagram of a flow chart of a method for reading information from an optical disc provided in an embodiment of the present application;

[0055] Figure 6 A schematic diagram of the structure of an optical disc information reading device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application. It is known to those skilled in the art that with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0057] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or modules is not necessarily limited to those steps or modules that are clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products or devices.

[0058] The term "and / or" in this application can be a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0059] It should also be noted that, in some alternative implementations, the functions / acts noted may occur out of the order of the drawings. For example, two figures shown in succession may in fact occur substantially simultaneously or may sometimes be performed in the reverse order, depending on the functions / acts involved.

[0060] In the embodiments of the present application, unless otherwise specified, the meaning of "at least one" refers to one or more, and the meaning of "plurality" refers to two or more. It is understood that in the present application, "when", "if" and "if" all refer to the device making corresponding processing under certain objective circumstances, and do not limit the time, nor do they require that there must be a judgment action when the device is implemented, nor do they mean that there are other limitations. In addition, the special word "exemplary" means "used as an example, embodiment or illustrative". Any embodiment described as "exemplary" is not necessarily interpreted as being superior or better than other embodiments.

[0061] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0062] First of all, in order to better understand the solution of the embodiment of the present application, the application scenario of the embodiment of the present application is described below.

[0063] See also Figure 1a , Figure 1aA schematic diagram of the structure of an optical disc system provided in an embodiment of the present application. In the optical disc system 100, when the optical disc drive 120 receives a read or write command specifying a logical address from the host 110, it converts the logical address into a physical address, and reads or writes user data at a corresponding position on the optical disc 130 by irradiating a laser on the optical disc 130 loaded into the device, and transmits the user data to the host 110.

[0064] The host 110 may be, for example, a personal computer (PC), a computer workstation, a server, a smart phone, a tablet computer, a smart camera, a smart car or other types of cellular phones, a media consumption device, a wearable device, a set-top box, a game console, etc.

[0065] The optical disc drive 120 includes a controller and a communication interface. The controller can be regarded as a dedicated chip, and the controller includes a processor and a hardware module. The processor is mainly used for coordination and scheduling, and works in conjunction with the hardware module.

[0066] The processor is a general-purpose central processing unit (CPU), and may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices (PLD), transistor logic devices, hardware components or any combination thereof. The above-mentioned PLD is a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL) or any combination thereof.

[0067] The hardware module is a dedicated circuit, which is the general term for all circuits in the optical disk drive. It is mainly used to emit laser and decode address information.

[0068] Optionally, the optical disk drive 120 may further include a memory.

[0069] The memory may be a random access memory (RAM), a dynamic random access memory (DRAM), a storage class memory (SCM), a static random access memory (SRAM), etc. It may also be a read only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (EPROM), etc.

[0070] In addition, the memory may also be a dual inline memory module or a dual inline memory module (DIMM), that is, a module composed of DRAM, or a solid state disk (SSD).

[0071] In practical applications, multiple memories and memories of different types can be configured in the optical disk drive. This embodiment does not limit the number and type of memories. In addition, the memory can be configured to have a power-saving function. The power-saving function means that when the system loses power and then powers on again, the data stored in the memory will not be lost. A memory with a power-saving function is called a non-volatile memory. In some embodiments, the memory is used to store program codes for executing the solution of the present application, and the processor executes the program codes stored in the memory.

[0072] Optionally, the memory exists independently and is connected to the processor via a communication bus.

[0073] Optionally, the memory and the processor are integrated together.

[0074] The communication interface uses any transceiver-like device for communicating with the host 110. The communication interface includes a peripheral component interconnect express (PCIe) bus, a serial advanced technology attachment (SATA) interface, a serial attached small computer system interface (SAS), an M.2 and other wired communication interfaces. Optionally, the communication interface also includes a wireless communication interface. Among them, the wireless communication interface is, for example, an Ethernet interface. The Ethernet interface is an optical interface, an electrical interface or a combination thereof. The wireless communication interface is a wireless local area network (WLAN) interface, a cellular network communication interface or a combination thereof, etc.

[0075] In a specific implementation, as an embodiment, the processor includes one or more CPUs.

[0076] In a specific implementation, as an embodiment, the optical disk drive 120 includes multiple processors. Each of these processors is a single-core processor (single-CPU) or a multi-core processor (multi-CPU). The processor here refers to one or more devices, circuits, and / or processing cores for processing data (such as computer program instructions).

[0077] The optical disc drive 120 generates laser spots on the recording layer and the guide layer of the optical disc 130 respectively by using an objective lens. A spiral continuous groove is formed on the guide layer to achieve tracking control of the laser spot.

[0078] The optical disk drive 120 uses the same objective lens. In one example, the optical disk drive 120 focuses the blue laser beam on the desired recording layer and the red laser beam on the guide layer, uses the red laser to perform servo guidance on the guide layer, and uses the blue laser to record / read data on the recording layer.

[0079] The structure of the optical disc 130 can be seen in Figure 1b , Figure 1b Figure 1 is a schematic diagram of the structure of a CD. Figure 1b As shown, the optical disc 130 includes a guide layer 131 having a structure of a groove track and a land track and N recording layers 132 (N≥1, N is a natural number). The groove portion is called a groove, and the track formed by the groove is called a groove track. The area between adjacent grooves is called a land, and the track formed by the land is called a land track.

[0080] The guide layer 131 is used to control the movement of the objective lens in the radial direction. The recording layer 132 is used to store data. The optical disc drive 120 uses the objective lens to generate laser spots L1 and L2 on the recording layer 132 and the guide layer 131, respectively. In order to perform tracking control of the laser spots L1 and L2, a spiral continuous groove is formed on the guide layer 131.

[0081] Examples of the optical disc 130 include recordable optical discs including DVD (Digital Video Disc)-R, DVD+R, DVD-RW, DVD+RW, DVD-RAM, BD-R, BD-RE, and the like.

[0082] It should be noted that the optical disc 130 involved in the embodiment of the present application includes one guide layer.

[0083] See also Figure 1c , Figure 1c Another structural diagram of an optical disc. In the optical disc 130, a physical address is recorded on the track of the recording layer 132 by a wobble modulation method. Even if the guide groove (groove) forming the recording track is meandering, the physical address is recorded by frequency modulation or phase modulation of the meandering (wobble). When recording data on the optical disc 130, the optical disc drive 120 demodulates the wobble to obtain a physical address (sector number), generates an ID (Identification Data) containing the physical address as a logical address of the recording data frame, and records the ID together with user data, etc., in the recording layer 132 of the optical disc 130.

[0084] It is understandable that as the optical disc rotates, the laser irradiates the groove track, and the reflected light signal is converted into an electrical signal and presents periodic changes. Since the swing of the laser on the groove track does not change completely regularly, the reflection intensity of the laser on the groove track will change, and the frequency of the corresponding reflected light signal will also change. Among them, most of the frequency changes are uniform, but there are also some high-frequency swings. The corresponding address information can be decoded according to the high-frequency information. For example, taking the 56 reflected waveforms as a group, taking the cosine wave as an example, these 56 cosine waves are encoded as 1 bit, and the corresponding information bit represents 0 or 1. The optical disc drive can detect the presence of a few high-frequency cosine waves on the 56 standard cosine waves through the detection circuit. These high-frequency waveforms are denser than normal waveforms and have a higher swing frequency. According to the number of these cosine waves in the 56 and the number of times they appear, it is identified whether the information bit corresponding to these 56 cosine waves represents 0 or 1, so as to encode the 56 cosine waves into different address information.

[0085] In the embodiment of the present application, in order to further increase the recording capacity, the idea of ​​using both the groove track and the land track to record information is proposed. However, in the optical disc structure with a single guide layer, currently only the groove track is used for guidance, and the land track is not directly used for guidance, for the following reasons:

[0086] 1. The land track shares two adjacent slot tracks, and the slot track is on the spiral involute. The physical length of the basic unit of the swing is fixed. Therefore, the swing of the slot tracks with different radii cannot be aligned, causing the DC component of the push-pull signal to be non-zero, thus affecting the tracking servo.

[0087] 2. Since the land track shares two adjacent groove tracks and the wobbles are not aligned, the address information on the land track cannot be correctly decoded and decoded.

[0088] In order to solve the above problems, an embodiment of the present application provides an optical disc, which includes a guide layer, the guide layer includes a land track, the land track includes a first recording point and a second recording point of different lengths, and the first recording point and the second recording point are used to represent the address information of the land track.

[0089] In addition, based on the improvement of the structure of the optical disc, the embodiment of the present application also provides a method for reading information from the optical disc, which can be applied to Figure 1a In the optical disc drive shown, the method can be specifically executed by a controller. The method includes: obtaining a first optical signal reflected by a laser at a first recording point and a second optical signal reflected by a laser at a second recording point; converting the first optical signal and the second optical signal into a first electrical signal and a second electrical signal respectively; and determining the address information of the land track according to the first electrical signal and the second electrical signal.

[0090] In a single-guide-layer optical disc structure, a pre-pressed wobble groove is generally used to achieve the purpose of servo guidance, and the data recording position is located by modulating the address information on the wobble groove. In order to further improve the recording density of the optical disc, the present application sets a first recording point and a second recording point of different lengths on the land track of the optical disc, so that when the laser is irradiated to the land track, the address information of the land track can be determined according to the first recording point and the second recording point, and the direct guidance of the land track is realized, thereby further compressing the track distance of the guide layer and improving the storage density of the optical disc. In addition, since the structure of the optical disc is a single-guide layer, the guide layer and the recording layer are physically separated. Therefore, recording information on the guide layer by using recording points will not interfere with the reading of information on the recording layer.

[0091] In addition, in the optical disc structure with multiple guide layers and multiple recording layers, there is a method of changing the waveform modulation method (such as the double-sided swing method) to achieve the purpose of guiding the groove track and the land track at the same time. However, if the number of layers of the optical disc is too large, the yield rate is low and the process is complicated. Compared with the traditional multi-guide layer and multi-recording layer structure, the optical disc reading method provided in the present application is mainly applied to the optical disc structure with a single guide layer and multiple recording layers, that is, the guide layer and the recording layer are physically separated. Therefore, information can be recorded on the land track of the guide layer using recording points without interfering with the recording layer.

[0092] For ease of understanding, the optical disc and information reading method thereof provided by the embodiment of the present application are specifically described below in conjunction with the accompanying drawings and application scenarios. A person skilled in the art will appreciate that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiment of the present application are also applicable to similar technical problems.

[0093] First, the structure of the optical disk will be described.

[0094] See also Figure 2a and Figure 2b , Figure 2a A schematic diagram of the structure of the guide layer of the optical disc provided in the embodiment of the present application, Figure 2b This is a partially enlarged structural diagram of the guide layer of the optical disc provided in the embodiment of the present application. Figure 2a and 2b As shown, the optical disc includes a guide layer, the guide layer includes a land track, the land track includes a first recording point 201 and a second recording point 202 of different lengths, and the first recording point 201 and the second recording point 202 are used to represent the address information of the land track.

[0095] In this embodiment, it is assumed that the length of the first recording point is greater than the length of the second recording point. Optionally, in a possible implementation, the length of the first recording point is two-thirds of the length of the second recording point.

[0096] In this implementation, the length of the first recording point is set to two-thirds of the length of the second recording point. Correspondingly, the frequency of the first electrical signal reflected and converted by the laser spot when it moves to the first recording point is 1.5 times the frequency of the second electrical signal corresponding to the second recording point. By contrast, a high-frequency waveform and a low-frequency waveform are formed, thereby encoding and decoding the address information based on the frequency change.

[0097] The land track stores information in the form of recording points. Optionally, the first recording point and the second recording point on the land track may be made by, for example, laser.

[0098] See also Figure 3 , Figure 3A schematic diagram of the first recording point and the second recording point provided in the embodiment of the present application. In this embodiment, the length of a single first recording point is two-thirds of the length of a single second recording point. The combination of 4 first recording points and a blank is set as the first unit, and the combination of 6 second recording points and a blank is set as the second unit. The total length of the first unit is the same as the total length of the second unit, and the signal frequency corresponding to the first recording point is 1.5 times the signal frequency corresponding to the second recording point.

[0099] The combination of the first unit and the second unit in this embodiment is set to match the swing frequency on the groove track so as to perform decoding based on a frequency range. In actual application, the specific number and length of the recording points in the first unit and the second unit can be set according to actual needs to achieve the purpose of matching the swing frequency on the groove track, and are not limited here.

[0100] It is understandable that, during the process of laser irradiation on the land track, if the reflected signal oscillates at a frequency, information cannot be recorded. In this embodiment, by setting recording points of different lengths, the frequency of the signal fed back changes when the optical disc rotates at the same speed. In addition, in actual application, while ensuring that the lengths of the first recording point and the second recording point are different, the size relationship between the lengths of the first recording point and the second recording point can be set according to actual needs. This is only an example and is not limited here.

[0101] Since the recording point is mainly used for marking, that is, decoding the address information by irradiating the laser onto the recording point and reflecting and converting the frequency of the electrical signal, the first recording point and the second recording point can both be pits or protrusions.

[0102] Based on the above optical disc structure, in one example, a specific rule for modulating the optical disc based on the first unit and the second unit is:

[0103] Replace the three first units with the third unit, where the third unit is composed of the second unit, the first unit and the second unit. The composition of the third unit can be found in Figure 4 , Figure 4 This is a schematic diagram of the third unit provided in the embodiment of the present application. It should be understood that the third unit can also be other combinations of the first unit and the second unit, and the positional relationship between the first unit and the second unit is not limited and is specifically set according to actual needs.

[0104] When the master disc is produced, different combinations can be generated by replacing the third unit with the 56 first units. It is assumed that the combination of Data_0 and Data_1 corresponds to information bits 0 and 1, respectively.

[0105] 1) Data_1 unit: contains 1 third unit and 9 first units, 1 third unit, and 41 first units;

[0106] 2) Data_0 unit: includes 1 third unit and the following 11 first units, 1 third unit, and 39 first units.

[0107] On this basis, a master disc is produced according to different combinations, and a corresponding optical disc is produced based on the produced master disc. At this time, the recording points on the optical disc can encode the required guide information according to the above combination.

[0108] The above example is only one optional implementation method. In actual application, recording points of other lengths may be set on the optical disc. Optionally, the land track may further include a third recording point. The length of the third recording point is different from the lengths of the first recording point and the second recording point. The first recording point, the second recording point and the third recording point are used to represent the address information of the land track.

[0109] The length of the third recording dot may be between the first recording dot and the second recording dot, or may be greater than the first recording dot and the second recording dot, so as to encode and decode the address information through the changes of three frequencies.

[0110] It can be understood that, since the spacing between the land tracks maintains the normal track distance, and due to the difference in signal detection methods, the adjacent groove tracks will not cause signal interference to the land track.

[0111] Based on the improvement of the structure of the optical disc, please refer to Figure 5 , Figure 5 A schematic flow chart of a method for reading information from an optical disc provided in an embodiment of the present application. The information reading method may be performed as follows: Figure 1a The optical disc drive device shown in the figure executes, specifically, the controller in the optical disc drive device executes. Figure 5 As shown, the controller executes the following steps 501 to 503.

[0112] Step 501: A controller obtains a first optical signal reflected by a laser at a first recording point and a second optical signal reflected by a laser at a second recording point.

[0113] In this embodiment, the laser irradiates the land track of the optical disc. As the optical disc rotates, the laser spot moves on the land track. When the spot passes through the first recording point and the second recording point, the controller detects the first light signal and the second light signal respectively reflected by the first recording point and the second recording point through the photoelectric detection device. The photoelectric detection device is, for example, a PDIC (photodetector integrated circuit) detection chip.

[0114] In one example, the optical disc drive device may use a differential push-pull (DPP) detection method to perform tracking servo and detect a wobble signal on a groove track, and use a differential phase detection (DPD) signal detection method to perform tracking servo on a land track.

[0115] Step 502, the controller converts the first optical signal and the second optical signal into a first electrical signal and a second electrical signal respectively;

[0116] Step 503: The controller determines address information of the land track according to the first electrical signal and the second electrical signal respectively.

[0117] In this embodiment, the controller decodes the address information of the corresponding position on the land track irradiated by the laser according to the waveform information corresponding to the first electrical signal and the second electrical signal.

[0118] In a possible implementation, the controller determines the address information of the land track according to the first electrical signal and the second electrical signal, including:

[0119] The controller determines the values ​​of the information bits corresponding to the first electrical signal and the second electrical signal according to the frequency changes corresponding to the first electrical signal and the second electrical signal respectively;

[0120] The controller decodes the address information of the land track according to the value of the information bit.

[0121] In this implementation, the controller determines the frequency change information corresponding to the waveforms corresponding to the first electrical signal and the second electrical signal respectively, and determines the values ​​of the information bits corresponding to the several waveforms according to the positions and times of high frequency occurrence in the several waveforms, so as to decode the address information of the shore track.

[0122] The laser generates a signal (waveform) when passing through each recording point. In an example, this embodiment uses 56 basic waveforms as an information bit, and uses the combined 56 waveforms as an information bit to decode the address information. That is, 56 first units represent a bit, and a single first recording point or a second recording point only serves as a pattern or a basic waveform. Based on the changes in the 56 waveforms, the positions and times of the first unit and the second unit appearing in the 56 consecutive waveforms are detected to determine whether the value of the information bit corresponding to the 56 waveforms represents 0 or 1. Taking the address information as 24 bits as an example, the specific position of the current laser irradiation on the optical disc is determined by the composition of the 24 consecutive information bits.

[0123] It should be noted that, in actual application, the combination of recording points representing information bits 0 and 1 can be set according to actual needs, and is not limited here. In addition, in this embodiment, 56 waveform changes are used to represent the value of an information bit, and 24 bits are used as an address information, which can also be flexibly set according to actual needs, and are also not limited here.

[0124] The above example is only one optional implementation method. In actual application, recording points of other lengths may be set on the optical disc. Optionally, the land track may further include a third recording point. The length of the third recording point is different from the lengths of the first recording point and the second recording point. The first recording point, the second recording point, and the third recording point are used to represent the address information of the land track. The method further includes:

[0125] The controller acquires a third light signal reflected by the laser at a third recording point;

[0126] The controller converts the third optical signal into a third electrical signal;

[0127] The controller determines address information of the land track according to the first electrical signal, the second electrical signal and the third electrical signal.

[0128] In this implementation, the controller can decode the corresponding address information based on the frequency change of the waveform corresponding to the first recording point, the second recording point and the third recording point. Assuming that the lengths of the first recording point, the second recording point and the third recording point become shorter in sequence, the frequencies of the waveforms corresponding to the first recording point, the second recording point and the third recording point respectively decrease in sequence, then the controller can determine the values ​​of the information bits represented by several waveforms (taking 56 waveforms as one information bit as an example) according to the changes in the three waveforms, and decode the corresponding address information based on the combination of several information bits (taking 24 bits representing one address information as an example).

[0129] The groove track adopts a swinging guidance method, and the land track adopts a recording point guidance method. In the actual implementation process, the controller can select a corresponding decoding method to extract information according to the current position of the laser irradiation (specifically, the groove track or the land track).

[0130] It is worth noting that, based on the characteristics that a single-guide-layer multi-recording-layer optical disc uses two laser beams of different colors and the guide layer is read-only, the embodiment of the present application proposes an information reading method for an optical disc, which realizes the function of simultaneous groove-land guidance by using a wobble groove technology on the groove track and an information recording point method on the land track. In addition, the embodiment of the present application can realize signal detection by completely using existing hardware photoelectric detection devices, which saves costs and is easy to implement.

[0131] exist Figures 1a to 5On the basis of the corresponding embodiments, in order to better implement the above solutions of the embodiments of the present application, the following also provides related devices for implementing the above solutions. Figure 6 , Figure 6 A schematic diagram of the structure of an optical disc information reading device provided in an embodiment of the present application.

[0132] The optical disc information reading device 6000 may be located at Figure 1a In the optical disc drive shown, it can be understood that the optical disc information reading device 6000 is composed of a dedicated circuit. The optical disc includes a guide layer, the guide layer includes a land track, the land track includes a first recording point and a second recording point of different lengths, the first recording point and the second recording point are used to represent the address information of the land track, and the optical disc information reading device 6000 includes:

[0133] A signal acquisition module 6001 is used to acquire a first optical signal reflected by the laser at a first recording point and a second optical signal reflected by the laser at a second recording point;

[0134] A signal conversion module 6002, configured to convert the first optical signal and the second optical signal into a first electrical signal and a second electrical signal respectively;

[0135] The information determination module 6003 is used to determine the address information of the land track according to the first electrical signal and the second electrical signal.

[0136] In a possible implementation, the information determination module 6003 is used to:

[0137] Determine the values ​​of the information bits corresponding to the first electrical signal and the second electrical signal according to the frequency changes corresponding to the first electrical signal and the second electrical signal respectively;

[0138] The address information of the landing track is decoded according to the value of the information bit.

[0139] In a possible implementation, the length of the first recording point is two-thirds of the length of the second recording point.

[0140] In a possible implementation, the first recording point is a pit or a protrusion.

[0141] In a possible implementation, the second recording point is a pit or a protrusion.

[0142] In a possible implementation, the land track further includes a third recording point, the length of the third recording point is different from the lengths of the first recording point and the second recording point, the first recording point, the second recording point, and the third recording point are used to represent address information of the land track, and the information determination module 6003 is further used to:

[0143] Acquiring a third optical signal reflected by the laser at a third recording point;

[0144] converting the third optical signal into a third electrical signal;

[0145] Address information of the land track is determined according to the first electrical signal, the second electrical signal and the third electrical signal.

[0146] In this embodiment, the operations performed by each unit in the optical disc information reading device 6000 are the same as those described above. Figure 5 The method described in the illustrated embodiment is similar and can be used to implement the functions of the computing device in the above method embodiment, and can also achieve the beneficial effects possessed by the above method embodiment, which will not be described in detail here.

[0147] The embodiment of the present application also provides a computer program product. When the computer program product is run on a computer, the computer is enabled to execute any of the aforementioned method embodiments.

[0148] It is understood that the devices and methods described in the present application can also be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0149] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0150] The naming or numbering of the steps in this application does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The named or numbered process steps can change the execution order according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved. The division of the units in this application is a logical division. There may be other division methods when implemented in actual applications. For example, multiple units can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, and the indirect coupling or communication connection between units can be electrical or other similar forms, which are not limited in this application. In addition, the unit or subunit described as a separate component may or may not be physically separated, may or may not be a physical unit, or may be distributed in multiple circuit units, and some or all of the units can be selected according to actual needs to achieve the purpose of the present application solution.

[0151] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The various digital numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic.

[0152] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical disc, characterized in that: The optical disc comprises a guide layer, the guide layer comprises a land track, the land track comprises a first recording point and a second recording point of different lengths, the first recording point and the second recording point are used to represent the address information of the land track.

2. The optical disc according to claim 1, characterized in that The length of the first recording point is two thirds of the length of the second recording point.

3. The optical disc according to claim 1 or 2, characterized in that: The first recording point is a pit or a protrusion.

4. The optical disc according to any one of claims 1 to 3, characterized in that The second recording point is a pit or a protrusion.

5. The optical disc according to any one of claims 1 to 4, characterized in that: The shore track also includes a third recording point, the length of the third recording point is different from the lengths of the first recording point and the second recording point, and the first recording point, the second recording point and the third recording point are used to represent the address information of the shore track.

6. A method for reading information from an optical disc, characterized in that: The optical disc comprises a guide layer, the guide layer comprises a land track, the land track comprises a first recording point and a second recording point of different lengths, the first recording point and the second recording point are used to represent address information of the land track, and the method comprises: Acquire a first optical signal reflected by the laser at the first recording point and a second optical signal reflected by the laser at the second recording point; Convert the first optical signal and the second optical signal into a first electrical signal and a second electrical signal respectively; Address information of the land track is determined according to the first electrical signal and the second electrical signal.

7. The method according to claim 6, characterized in that Determining address information of the land track according to the first electrical signal and the second electrical signal includes: Determine values ​​of information bits corresponding to the first electrical signal and the second electrical signal according to frequency changes corresponding to the first electrical signal and the second electrical signal respectively; The address information of the land track is decoded according to the value of the information bit.

8. The method according to claim 6 or 7, characterized in that: The length of the first recording point is two thirds of the length of the second recording point.

9. The method according to any one of claims 6 to 8, characterized in that The first recording point is a pit or a protrusion.

10. The method according to any one of claims 6 to 9, characterized in that The second recording point is a pit or a protrusion.

11. The method according to any one of claims 6 to 10, characterized in that The land track further includes a third recording point, the length of the third recording point is different from the lengths of the first recording point and the second recording point, the first recording point, the second recording point and the third recording point are used to represent address information of the land track, and the method further includes: Acquiring a third optical signal reflected by the laser at the third recording point; converting the third optical signal into a third electrical signal; Address information of the land track is determined according to the first electrical signal, the second electrical signal, and the third electrical signal.

12. An optical disc information reading device, characterized in that: The optical disc comprises a guide layer, the guide layer comprises a land track, the land track comprises a first recording point and a second recording point of different lengths, the first recording point and the second recording point are used to represent address information of the land track, and the device comprises: A signal acquisition module, used to acquire a first optical signal reflected by the laser at the first recording point and a second optical signal reflected by the laser at the second recording point; a signal conversion module, used to convert the first optical signal and the second optical signal into a first electrical signal and a second electrical signal respectively; An information determination module is used to determine the address information of the land track according to the first electrical signal and the second electrical signal.

13. The device according to claim 12, characterized in that The information determination module is used for: Determine values ​​of information bits corresponding to the first electrical signal and the second electrical signal according to frequency changes corresponding to the first electrical signal and the second electrical signal respectively; The address information of the land track is decoded according to the value of the information bit.

14. The device according to claim 12 or 13, characterized in that The length of the first recording point is two thirds of the length of the second recording point.

15. The device according to any one of claims 12 to 14, characterized in that The first recording point is a pit or a protrusion.

16. The device according to any one of claims 12 to 15, characterized in that The second recording point is a pit or a protrusion.

17. The device according to any one of claims 12 to 16, characterized in that The land track further includes a third recording point, the length of the third recording point is different from the lengths of the first recording point and the second recording point, the first recording point, the second recording point and the third recording point are used to represent address information of the land track, and the information determination module is further used to: Acquiring a third optical signal reflected by the laser at the third recording point; converting the third optical signal into a third electrical signal; Address information of the land track is determined according to the first electrical signal, the second electrical signal, and the third electrical signal.

18. A computer program product, characterized in that When the computer program product is executed by a computer, the method according to any one of claims 6 to 11 is implemented.

19. An optical disc system, characterized in that: The optical disc system comprises at least one optical disc as claimed in any one of claims 1 to 5.

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