Data reading and writing system and method

Abstract

The present application discloses a data reading and writing system and method, which relates to the field of optical storage technology. The method can improve the reading and writing speed of optical storage without increasing the rotation speed of the optical storage medium. The system includes an optical deflector and a read-write optical head. The optical deflector is used to deflect a first optical signal at multiple angles in sequence to obtain multiple second optical signals. The read-write optical head is used to receive the multiple second optical signals and focus the multiple second optical signals on the optical storage medium respectively to realize the reading and writing of multiple data points.

Description

Technical Field

[0001] The present application relates to the field of optical storage technology, and in particular to a data reading and writing system and method. Background Art

[0002] With the development of information technology, the amount of computing and storage of various information has increased exponentially. Optical storage is widely used as an important means of information storage.

[0003] Traditional optical storage technology usually achieves data reading and writing on optical storage media by fixing the optical head used to emit optical signals and using a high-speed rotating motor to drive the optical storage medium (such as a CD) to rotate at high speed. In order to increase the speed of reading and writing data, the traditional approach is usually to increase the rotation speed of the optical storage medium. However, increasing the rotation speed of the optical storage medium will increase the jitter noise of the optical storage medium, which in turn increases the difficulty of optical path servo.

[0004] Based on this, how to improve the reading and writing speed of optical storage without increasing the rotation speed of the optical storage medium is an urgent technical issue. Summary of the invention

[0005] The present application provides a data reading and writing system and method, which can improve the reading and writing speed of optical storage without increasing the rotation speed of the optical storage medium.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] In a first aspect, the present application provides a data reading and writing system, the system comprising: an optical deflector, used to deflect a first optical signal at multiple angles in sequence to obtain multiple second optical signals; a read-write optical head, used to receive the multiple second optical signals and focus the multiple second optical signals on an optical storage medium respectively to realize reading and writing of multiple data points.

[0008] The data reading and writing system provided by the present application can sequentially deflect the first optical signal used for reading and writing data through an optical deflector, thereby realizing reading and writing a row of data points on an optical storage medium. By reading and writing data on a moving optical storage medium through the data reading and writing system provided by the present application, it is realized that by controlling a single beam of optical signal, multiple data tracks in a data band can be simultaneously read and written on the optical storage medium without increasing the rotation speed of the optical storage medium, and the effect of parallel reading and writing data is realized through a single beam of optical signal, thereby improving the efficiency of reading and writing data by the data reading and writing system.

[0009] In a possible design, the system further includes: a mobile platform for placing the optical storage medium and for controlling the optical storage medium to rotate or translate on a plane perpendicular to the axial direction of the read / write optical head. The optical deflector is specifically used to deflect the first optical signal by multiple angles in each preset period of multiple preset periods in turn to obtain multiple second optical signals. The read / write optical head is also used to receive the multiple second optical signals in each preset period and focus the multiple second optical signals on the optical storage medium respectively to realize reading and writing of multiple data tracks. The multiple data tracks include the multiple data points mentioned above, and the multiple data tracks correspond to the multiple data points one by one.

[0010] Through this possible design, the data reading and writing system provided by the present application realizes reading and writing data on a moving optical storage medium, thereby realizing the simultaneous reading and writing of multiple data tracks in a data band on the optical storage medium by controlling a single beam of light signal without increasing the rotation speed of the optical storage medium, achieving the effect of parallel reading and writing of data through a single beam of light signal, thereby improving the efficiency of reading and writing data by the data reading and writing system.

[0011] In another possible design, the optical deflector includes at least one of the following devices: a polygonal mirror, a galvanometer, an acousto-optic deflector or an electro-optic deflector.

[0012] Through this possible design, the data reading and writing system provided by this application can meet different design requirements.

[0013] In another possible design, the plurality of data tracks include at least one servo track, and the plurality of servo points on the servo track are discretely distributed, wherein the servo points are used to adjust the focal position of the optical head when the data read / write system reads data.

[0014] In another possible design, the distance between any two adjacent servo points among the plurality of servo points is greater than or equal to a preset distance.

[0015] Through these two possible designs, servo can be performed when the data reading and writing system reads data, thereby improving the accuracy of the data reading and writing system when reading data.

[0016] In another possible design, the optical storage medium includes multiple storage layers, and the servo points in the multiple storage layers are discretely distributed in the axial direction of the read / write optical head. The servo points are used to adjust the focal position of the read / write optical head when the data read / write system reads data.

[0017] When the optical storage medium includes multiple storage layers, when the data read-write system reads the servo point on the storage layer far away from the read-write optical head, this possible design can reduce the attenuation of the optical signal reading the servo point, thereby ensuring the accurate servo of the servo point to the data read-write system, thereby improving the accuracy of the data read-write system when reading data.

[0018] In another possible design, the above-mentioned multiple data tracks can form a data band. The above-mentioned system also includes: a radial moving stage, which is used to move the optical deflector and the read-write optical head in the data reading and writing system by a preset distance in a plane perpendicular to the axial direction of the read-write optical head after the first data band is read and written on the first storage layer among the multiple storage layers of the above-mentioned optical storage medium, so as to realize the reading and writing of the second data band in the first storage layer. The first storage layer includes multiple data bands.

[0019] Through this possible design method, full disk reading and writing of optical storage media can be achieved.

[0020] In another possible design, the above system further includes: a signal processing module, for receiving a third optical signal when the data reading and writing system reads data; and, when the third optical signal is a servo optical signal, generating a servo control signal based on the third optical signal for adjusting the focal position of the reading and writing optical head in the data reading and writing system when focusing the optical signal; and, when the third optical signal is a data optical signal, determining the data to be read based on the third optical signal. The third optical signal is an optical signal returned by the optical storage medium after any one of the plurality of second optical signals acts on any data point on the optical storage medium. If any one of the data points is a servo point, the third optical signal is a servo optical signal; if any one of the data points is used to store data, the third optical signal is a data optical signal.

[0021] In another possible design, the system further includes: a light source assembly for obtaining the first light signal.

[0022] In a second aspect, the present application provides a data reading and writing method, which is applied to a data reading and writing system. The method includes: deflecting a first optical signal at multiple angles in sequence to obtain multiple second optical signals. The multiple second optical signals are focused on an optical storage medium to achieve reading and writing of multiple data points.

[0023] In a possible design, the method further includes: controlling the optical storage medium to rotate or translate on a plane perpendicular to the axial direction of the read / write optical head in the data read / write system. The above-mentioned "deflecting the first optical signal at multiple angles in sequence to obtain multiple second optical signals" specifically includes: deflecting the first optical signal at multiple angles in sequence in each of multiple preset periods to obtain multiple second optical signals. The method further includes: focusing the multiple second optical signals on the optical storage medium in each preset period to realize reading and writing of multiple data tracks. The multiple data tracks include multiple data points, and the multiple data tracks correspond to the multiple data points one by one.

[0024] In another possible design, the above-mentioned “deflecting the first optical signal at multiple angles in sequence to obtain multiple second optical signals” specifically includes: the optical deflector in the above-mentioned data reading and writing system deflects the first optical signal at multiple angles in sequence to obtain multiple second optical signals. The optical deflector includes at least one of the following devices: a multi-faceted mirror, a galvanometer, an acousto-optic deflector, or an electro-optic deflector.

[0025] In another possible design, the plurality of data tracks include at least one servo track, and the plurality of servo points on the servo track are discretely distributed, wherein the servo points are used to adjust the focal position of the read / write optical head when the data read / write system reads data.

[0026] In another possible design, the distance between any two adjacent servo points among the plurality of servo points is greater than or equal to a preset distance.

[0027] In another possible design, the optical storage medium includes a plurality of storage layers, and the servo points in the plurality of storage layers are discretely distributed in the axial direction of the optical head in the data reading and writing system. The servo points are used by the data reading and writing system to adjust the focal position of the optical head when focusing the optical signal when reading data.

[0028] In another possible design, the above-mentioned multiple data tracks form a data band. The above-mentioned method further includes: after performing a read and write operation on a first data band on a first storage layer among multiple storage layers of the optical storage medium, moving the optical deflector and the read and write optical head in the above-mentioned data read and write system by a preset distance in a plane perpendicular to the axial direction of the read and write optical head to realize reading and writing of a second data band in the first storage layer. The first storage layer includes multiple data bands.

[0029] In another possible design, the method further includes: when the third optical signal is a servo optical signal, generating a servo control signal for adjusting the focal position of the read / write optical head in the data read / write system when focusing the optical signal based on the third optical signal; and when the third optical signal is a data optical signal, determining the data to be read based on the third optical signal. The third optical signal is an optical signal returned by the optical storage medium after any one of the plurality of second optical signals acts on any data point on the optical storage medium. If the any data point is a servo point, the third optical signal is a servo optical signal; if the any data point is used to store data, the third optical signal is a data optical signal.

[0030] In another possible design, before the above-mentioned “deflecting the first optical signal in sequence at multiple angles to obtain multiple second optical signals”, the above-mentioned method also includes: generating the first optical signal.

[0031] Regarding the explanation of the data reading and writing method provided in the second aspect and the description of the beneficial effects, reference can be made to the explanation of the data reading and writing system provided in the first aspect and any possible design thereof and the description thereof will not be repeated here.

[0032] In a third aspect, the present application provides a data read and write control device. The data read and write control device includes a processor and a memory. The processor is used to call and run a computer program stored in the memory from the memory to control the data read and write system to execute the data read and write method in the second aspect and any possible design thereof.

[0033] In a fourth aspect, the present application provides a computer program product, which, when running on a data reading and writing control device, can control a data reading and writing system to execute the data reading and writing method in the second aspect and any possible design thereof.

[0034] In a fifth aspect, the present application provides a computer-readable storage medium, such as a non-transient computer-readable storage medium, on which a computer program (or instruction) is stored, and when the computer program (or instruction) is run on a data reading and writing control device, the data reading and writing system can be controlled to execute the data reading and writing method provided in the second aspect above.

[0035] It can be understood that any of the data read and write control devices, computer program products or computer storage media provided above can be applied to the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods and will not be repeated here.

[0036] In this application, the name of the data reading and writing system or the data reading and writing control device does not limit the device or functional module itself. In actual implementation, these devices or functional modules may appear with other names. As long as the functions of each device or functional module are similar to those of this application, they fall within the scope of the claims of this application and their equivalent technologies.

[0037] These and other aspects of the present application will become more apparent from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of a deflected light signal of an acousto-optic deflector in the prior art;

[0039] Figure 2 A schematic diagram of a focusing error in a data reading system provided in an embodiment of the present application;

[0040] Figure 3 A schematic diagram of a tracking error in a data reading system provided in an embodiment of the present application;

[0041] Figure 4 A schematic diagram of a data reading and writing system provided in an embodiment of the present application Figure 1 ;

[0042] Figure 5 A schematic diagram of the structure of a light source assembly provided in an embodiment of the present application;

[0043] Figure 6 A schematic diagram of a data reading and writing system provided in an embodiment of the present application Figure 2 ;

[0044] Figure 7 A schematic diagram of the optical deflector provided in an embodiment of the present application deflecting three optical pulse signals in a first optical signal received within a preset period to different angles in sequence;

[0045] Figure 8 A schematic diagram of data points written on an optical storage medium by a read / write optical head provided in an embodiment of the present application;

[0046] Fig. 9 A schematic diagram of a data reading and writing system provided in an embodiment of the present application Figure 3 ;

[0047] Fig.10 A schematic diagram of a data reading and writing system provided in an embodiment of the present application that controls a radial moving stage to move a preset distance to achieve writing of different data bands;

[0048] Fig.11 A schematic diagram of discrete distribution of servo points on a circular servo track overlapping in the axial direction provided by an embodiment of the present application;

[0049] Fig.12 A schematic diagram of a case in which servo tracks in data bands overlapping in an axial direction on each storage layer in a plurality of storage layers provided by an embodiment of the present application do not overlap in the axial direction;

[0050] Fig.13 A schematic diagram of the distribution of servo points on a circular servo track overlapping in the axial direction provided by an embodiment of the present application;

[0051] Fig.14 A schematic diagram of a data reading and writing system provided in an embodiment of the present application Figure 4 ;

[0052] Fig.15 A schematic diagram of an embodiment of the present application providing a method of moving a reflector by a third moving platform to adjust the position of the focus of an optical signal focused by a read / write optical head in a radial direction;

[0053] Fig.16 A schematic diagram of an embodiment of the present application for determining an adjustment direction of a servo control signal when adjusting a focal position of a light signal focused by a read / write optical head according to the size and shape of a light spot;

[0054] Fig.17 A schematic diagram of another method for determining the adjustment direction of a servo control signal when adjusting the focal position of a light signal focused by a read / write optical head according to the size and shape of a light spot provided in an embodiment of the present application;

[0055] Fig.18 A schematic diagram of a data band including multiple data blocks provided in an embodiment of the present application;

[0056] Fig.19 A flowchart of a data reading and writing method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0057] In order to more clearly understand the embodiments of the present application, some terms or technologies involved in the embodiments of the present application are explained below:

[0058] 1) Light deflector

[0059] Optical deflectors are devices that deflect the propagation direction of optical signals by using optical deflection technology. Optical deflectors are widely used in various equipment such as laser scanning precision measurement equipment, laser processing equipment, and laser pattern generation devices. Commonly used optical deflection technologies include mechanical deflection technology and non-mechanical deflection technology.

[0060] Among them, mechanical deflection technology usually uses optical devices such as multi-faceted rotating mirrors or galvanometers to achieve the deflection of the propagation direction of the optical signal. Non-mechanical deflection technology includes using the acousto-optic effect or electro-optic effect to change the refractive index of the transparent medium to achieve the deflection of the propagation direction of the optical signal.

[0061] Taking the optical deflector as an example, which uses the acousto-optic effect to deflect the propagation direction of the optical signal, the working principle of the optical deflector is briefly explained: the propagation of sound waves in a transparent medium (such as a crystal) can change the refractive index of the transparent medium, thereby forming a phase-type diffraction grating on the transparent medium. When the optical signal passes through the diffraction grating, the propagation direction of the optical signal is deflected.

[0062] The angle range of the light signal that the acousto-optic deflector can deflect is proportional to the frequency change of the sound wave propagating in the transparent medium. Specifically, the angle range △θ of the light signal deflected by the acousto-optic deflector can be calculated by the following formula (1):

[0063]

[0064] Wherein, λ is the wavelength of the deflected light signal, f1 may be the starting frequency of the sound wave propagating in the transparent medium, f2 may be the ending frequency of the sound wave propagating in the transparent medium, and v is the speed of the sound wave propagating in the transparent medium.

[0065] Among them, the sound wave used to change the refractive index of the transparent medium in the acousto-optic deflector is usually obtained by performing an electrical-to-acoustic conversion on the radio frequency (RF) signal received by the acousto-optic deflector. In this way, by controlling the frequency of the RF signal input to the acousto-optic deflector, sound wave signals of different frequencies can be obtained, and then, the sound wave signals of different frequencies propagate in the transparent medium, so that the phase-type diffraction grating formed on the transparent medium deflects the propagation direction of the light signal passing through the phase-type diffraction grating at different angles.

[0066] In practical applications, the frequency of the RF signal input to the acousto-optic deflector is usually a RF signal with a continuously changing frequency. Therefore, the frequency of the acoustic wave signal obtained after the electro-optic conversion is also continuously changing. In this way, the optical signal can be continuously deflected when passing through a transparent medium acted upon by the acoustic wave with a continuously changing frequency.

[0067] It should be understood that in the acousto-optic deflector, if the frequency of the sound wave propagating in the transparent medium changes from f1 to f2, or from f2 to f1, the angle range of the light signal that can be deflected by the acousto-optic deflector is △θ. In the embodiment of the present application, the time required for the frequency of the sound wave propagating in the transparent medium to change from f1 to f2 (or from f2 to f1) is referred to as a preset period. It can also be understood that within the preset period, the acousto-optic deflector can deflect the light signal by an angle range of △θ.

[0068] It should be understood that within a preset period, the frequency change of the sound wave is unidirectional, that is, it changes from small to large, or from large to small. Therefore, the acousto-optic deflector has unidirectional directionality in deflecting the optical signal within the preset period.

[0069] Exemplary, reference Figure 1 , Figure 1 Schematic diagram of the deflected light signal of the acousto-optic deflector is shown. Figure 1 As shown, the acousto-optic deflector 11 receives an RF signal with a continuously changing frequency, and converts the RF signal into an acoustic wave with a continuously changing frequency (for example, the frequency changes from f1 to f2). In this way, when the acoustic wave with a continuously changing frequency propagates in the transparent medium in the acousto-optic deflector 11, the incident optical signal 12 received by the acousto-optic deflector 11 can be continuously deflected within the range of angle △θ (or within the preset period mentioned above), thereby obtaining the outgoing optical signals 1, 2, ..., and n in sequence.

[0070] In this case, the incident optical signal 12 is a continuous optical signal. For example, at time 1, the optical signal 12 is deflected to obtain optical signal 1, at time 2, the optical signal 12 is deflected to obtain optical signal 2, and at time n, the optical signal 12 is deflected to obtain optical signal n. Here, time 1, time 2, ..., and time n are continuous moments within a preset period. It can be seen that the acousto-optic deflector 11 is based on Figure 1 In the direction shown in the middle direction 1, the optical signal 12 is deflected in sequence to obtain optical signals with different exit angles. Here, the exit angle is the angle between the exiting optical signal and the incident optical signal.

[0071] Of course, the incident optical signal 12 may also be a pulsed optical signal. In this case, if the acousto-optic deflector receives n (n is an integer greater than 1) optical pulse signals within the preset period T, the n optical pulse signals may be deflected by the acousto-optic deflector 11 within the preset period T. Figure 1 Deflect in sequence in the direction shown in Direction 1 to obtain n optical signals with different emission angles. The largest angle between the n optical signals with different emission angles is less than or equal to Δθ.

[0072] It can be seen that the optical deflector that uses the acousto-optic effect to deflect the optical signal controls the deflection of the propagation direction of the optical signal by changing the frequency of the RF signal. It is not restricted by mechanical rotating elements and therefore has the characteristics of fast deflection speed, no inertia, and low mechanical loss.

[0073] 2) Focus error

[0074] Focus error can also be called axial error or defocus.

[0075] When using an optical signal to read data stored in an optical storage medium in a data reading system, a read / write optical head is usually required to focus the optical signal on a storage layer 1 for storing data in the optical storage medium, so as to read the data stored on the storage layer 1. In this case, in the optical axis direction of the optical signal, the distance between the focus of the optical signal after being focused by the read / write optical head and the storage layer 1 for storing data is 0.

[0076] When the distance between the focus of the optical signal after being focused by the read / write optical head and the storage layer 1 for storing data is not 0, that is, in the optical axis direction of the optical signal, there is a certain distance between the focus of the optical signal after being focused by the read / write optical head and the storage layer 1. In this case, the optical signal is not focused on the storage layer 1 for storing data. In this case, the distance between the focus of the optical signal after being focused by the read / write optical head and the storage layer 1 can be called the focusing error of the data reading system.

[0077] refer to Figure 2 , Figure 2 FIG. 1 shows a schematic diagram of focusing error in a data reading system. Figure 2 As shown, on the storage layer 20 for storing data in the optical storage medium, there is a data point A for recording data. The focus of the optical signal 21 for reading data after being focused by the read / write optical head is the focus B, and the optical axis of the optical signal 21 is the optical axis 211. It can be seen that in the direction of the optical axis 211, the distance between the focus B and the data point A is Δz. That is, Figure 2 The data reading system is shown at a current focus error of Δz.

[0078] 3) Tracking error

[0079] Tracking error can also be called radial error.

[0080] When using an optical signal to read data stored in an optical storage medium in a data reading system, when the focusing error is 0, or the focusing error is less than or equal to a preset threshold, the focus of the optical signal used to read the data after being focused by the read / write optical head and the data point used to record the data on the optical storage medium need to coincide in the radial direction in order to realize the reading of the data stored on the optical storage medium. The radial direction here refers to the direction perpendicular to the optical axis of the optical signal used to read the data. The specific value of the preset threshold here is not limited in the embodiments of the present application.

[0081] When the focus of the optical signal for reading data after being focused by the optical head does not coincide with the data point on the optical storage medium in the radial direction, that is, the focus of the optical signal after being focused by the read / write optical head and the data point on the optical storage medium have a certain offset in the radial direction. In this case, the offset can be called the tracking error of the data reading system.

[0082] It should be understood that, on the two-dimensional plane where the radial direction is located, the radial offset may include an x-axis offset and a y-axis offset.

[0083] refer to Figure 3 , Figure 3 Figure 1 shows a schematic diagram of tracking error in a data reading system. Figure 3 As shown, the two-dimensional plane formed by the x-axis and the y-axis is a plane perpendicular to the optical axis of the optical signal used to read data. The focus of the optical signal after being focused by the read / write optical head is the focus 31. The optical storage medium includes a data point 32 for recording data. It can be seen that the radial offset between the focus 31 and the data point 32 includes an x-axis offset Δx and a y-axis offset Δy. Among them, Δx represents the distance between the focus 31 and the data point 32 in the x-axis direction, and Δy represents the distance between the focus 31 and the data point 32 in the y-axis direction.

[0084] 4) Other terms

[0085] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0086] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "plurality" means two or more.

[0087] The term "at least one" in this application means one or more, and the term "multiple" in this application means two or more, for example, multiple second messages means two or more second messages. The terms "system" and "network" are often used interchangeably herein.

[0088] It should be understood that the terms used in the description of the various examples herein are only for describing specific examples and are not intended to be limiting. As used in the description of the various examples and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0089] It should also be understood that the term "and / or" used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. The term "and / or" is a description of the association relationship of associated objects, indicating that three relationships may exist. 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.

[0090] It should also be understood that in the various embodiments of the present application, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0091] It should be understood that determining B based on A does not mean determining B only based on A. B can also be determined based on A and / or other information.

[0092] It should also be understood that the term “comprise” (also known as “includes,” “including,” “comprises” and / or “comprising”) when used in this specification specifies the presence of stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0093] It should also be understood that the term "if" may be interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting." Similarly, the phrase "if it is determined that ..." or "if [a stated condition or event] is detected" may be interpreted to mean "upon determining that ..." or "in response to determining that ..." or "upon detecting [a stated condition or event]" or "in response to detecting [a stated condition or event]," depending on the context.

[0094] It should be understood that the references to "one embodiment", "an embodiment", or "a possible implementation" throughout the specification mean that specific features, structures, or characteristics related to the embodiment or implementation are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment", or "a possible implementation" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0095] The embodiment of the present application provides a data reading and writing system, which deflects the optical signal and simultaneously moves the optical storage medium, thereby realizing simultaneous reading and writing of multiple data tracks. In this way, the speed of data reading and writing can be increased without increasing the moving speed of the optical storage medium.

[0096] Next, the data reading and writing system is described by first using the data reading and writing system as a system for writing data.

[0097] refer to Figure 4 , Figure 4 FIG. 4 shows a schematic diagram of the structure of a data reading and writing system 40 provided in an embodiment of the present application. Figure 4 As shown, the data reading and writing system 40 includes a light source assembly 41 , a light deflector 42 and a reading and writing optical head 43 .

[0098] The light source assembly 41 is used to generate an initial light signal, which is a pulsed light signal, for example, a high-frequency pulsed laser signal.

[0099] The optical pulse signal in the initial optical signal is an optical pulse signal with a first preset power. In this case, the optical pulse signal in the initial optical signal acts on the optical storage medium 44 after passing through the optical deflector 42 and the read / write optical head 43, and can generate physical and / or chemical properties corresponding to the data to be written, thereby realizing the writing of the data to be written. It should be understood that the first preset power corresponds one-to-one to the physical and / or chemical properties presented by the optical storage medium 44. Here, the embodiment of the present application does not limit the specific value of the first preset power.

[0100] The data to be written may be encoded data obtained by encoding the data to be stored. For example, the data to be written may be binary data obtained by encoding the data to be stored, or the data to be written may be decimal data obtained by encoding the data to be stored, etc., without limitation thereto.

[0101] It should be understood that if the data to be written is binary data, the optical storage medium 44 needs to present two physical and / or chemical properties after being acted upon by the optical signal. In this case, the first preset power mentioned above includes two different preset powers, and the two different preset powers correspond one-to-one to the two physical and / or chemical properties.

[0102] Exemplarily, when the above-mentioned data to be written is a binary number, the physical and / or chemical properties of the optical storage medium 44 are required to present two states. In this way, state 1 of the optical storage medium 44 can be used to represent "0", and state 2 of the optical storage medium 44 can be used to represent "1". Alternatively, state 1 of the optical storage medium 44 can be used to represent "1", and state 2 of the optical storage medium 44 can be used to represent "0". In this case, the above-mentioned optical signal with the first preset power includes optical signals with two preset powers. Among them, the optical signal with preset power 1 can be used to generate state 1 on the optical storage medium 44, thereby realizing the writing of "0", and the optical signal with preset power 2 can be used to generate a state on the optical storage medium 44, thereby realizing the writing of "1".

[0103] Similarly, if the data to be written is decimal data, the optical storage medium 44 needs to present ten physical and / or chemical properties after being acted upon by the optical signal. In this case, the first preset power mentioned above includes ten different preset powers, and the ten different preset powers correspond one-to-one to the ten physical and / or chemical properties. No further details will be given.

[0104] When the optical storage medium 44 records data in a reflective light type, the different physical and / or chemical properties produced by the optical storage medium 44 can make the optical storage medium 44 have different reflectivities. When the optical storage medium 44 records data in a spontaneous fluorescence type, the different physical and / or chemical properties produced by the optical storage medium 44 can make the optical storage medium 44 have different fluorescence radiation rates.

[0105] Specifically, refer to Figure 5 , Figure 5 FIG. 4 shows a schematic diagram of the structure of the light source assembly 41. Figure 5 As shown, the light source assembly 41 includes a light source 411. Optionally, the light source assembly 41 may further include a shaping device 412 and an optical power adjustment module 413.

[0106] The light source 411 is used to generate an original light signal, which is a pulsed light signal, for example, a high-frequency pulsed laser signal.

[0107] Optionally, the light source 411 may be a laser generator, for example, a diode laser generator, etc., but is certainly not limited thereto.

[0108] The power of each optical pulse signal in the original optical signal generated by the light source 411 is pre-acquired by the light source 411. Here, if the optical pulse signal in the original optical signal is used to write the data to be written, the power of the optical pulse signal pre-acquired by the light source 411 is a first preset power pre-determined based on the data to be written. If the optical pulse signal in the original optical signal is used to write the servo point, the power of the optical pulse signal pre-acquired by the light source 411 is a second preset power. Here, the embodiment of the present application does not limit the specific value of the second preset power.

[0109] The servo point is used to adjust the focal position of the optical signal focused by the read / write optical head 43 when reading data. The second preset power of the optical pulse signal used to write each servo point can be the same or different, which is not limited.

[0110] It should be understood that if the second preset power of the optical pulse signal used to write each servo point is the same, then after the data read-write system 40 writes the servo point on the optical storage medium 44, the area on the optical storage medium 44 used to represent each servo point has the same physical and / or chemical properties. If the second preset power of the optical pulse signal used to write each servo point is different, then after the data read-write system 40 writes the servo point on the optical storage medium 44, the area on the optical storage medium 44 used to represent each servo point has different physical and / or chemical properties. For the sake of simplicity, the embodiment of the present application is described by taking the second preset power of the optical pulse signal used to write each servo point as the same as an example.

[0111] It should be noted that the second preset power of the optical pulse signal used for writing the servo point is different from the first preset power of the optical pulse signal used for writing the data to be written.

[0112] Optionally, the original optical signal is the initial optical signal mentioned above.

[0113] The shaping device 412 is used to modulate the shape of the original optical signal generated by the light source 411 .

[0114] Exemplarily, the shaping device 412 may be a beam expander for expanding the original optical signal generated by the light source 411 .

[0115] As another example, the shaping device 412 may be a collimator for collimating the original optical signal generated by the light source 411 .

[0116] Optionally, when the loss in the optical path is not considered, the optical signal output after the original optical signal is shaped by the shaping device 412 is the initial optical signal.

[0117] The optical power adjustment module 413 is used to monitor whether the actual output power of each optical pulse signal in the original optical signal generated by the light source 411 meets the rated requirements, and when the actual output power of the optical pulse signal in the original optical signal generated by the light source 411 does not meet the rated requirements, adjust the parameters of the light source 411 so that the actual output power of the next optical pulse signal generated by the light source 411 meets the rated requirements.

[0118] Here, whether the actual output power of each optical pulse signal in the original optical signal generated by the light source 411 meets the rated requirements refers to whether the difference between the power of the optical pulse signal pre-acquired by the light source 411 and the power of the optical pulse signal actually output by the light source 411 based on the power is less than or equal to the first preset threshold. When the difference is less than the first preset threshold, it means that the actual output power of the optical pulse signal output by the light source 411 meets the rated requirements. When the difference is greater than the first preset threshold, it means that the actual output power of the optical pulse signal output by the light source 411 does not meet the rated requirements. Among them, the embodiment of the present application does not limit the specific value of the first preset threshold.

[0119] Here, the embodiment of the present application does not limit the case where the difference is equal to the first preset threshold. For example, the embodiment of the present application can determine that the actual output power of each optical pulse signal in the original optical signal generated by the light source 411 meets the rated requirements when the difference is equal to the first preset threshold. Of course, the embodiment of the present application can also determine that the actual output power of each optical pulse signal in the original optical signal generated by the light source 411 does not meet the rated requirements when the difference is equal to the first preset threshold.

[0120] Specifically, the optical power adjustment module 413 may include an optical beam splitter 4131 , a light detector 4132 , and a processor 4133 .

[0121] The optical beam splitter 4131 may be used to split the original optical signal received from the light source 411 into two optical signals (e.g., a first original optical signal and a second original optical signal). Alternatively, the optical beam splitter 4131 may be used to split the optical signal received from the shaping module 412 into a first original optical signal and a second original optical signal.

[0122] Here, as an example, the beam splitter 4131 may be a semi-transmissive and semi-reflective beam splitter prism or beam splitter lens, or the beam splitter 4131 may be a beam splitter prism or beam splitter lens with a preset beam splitting ratio, which is not limited.

[0123] The splitting ratio may refer to the ratio of the transmitted light signal and the reflected light signal of the optical beam splitter 4131. For example, if the optical beam splitter 4131 has a splitting ratio of 95:5, the optical beam splitter 4131 may transmit 95% of the incident light signal and reflect 5% of the incident light signal.

[0124] The first original optical signal may be an optical signal transmitted by the optical beam splitter 4131, or may be an optical signal reflected by the optical beam splitter 4131, and this is not limited. If the first original optical signal is an optical signal transmitted by the optical beam splitter 4131, the second original optical signal is an optical signal reflected by the optical beam splitter 4131. If the first original optical signal is an optical signal reflected by the optical beam splitter 4131, the second original optical signal is an optical signal transmitted by the optical beam splitter 4131.

[0125] like Figure 5 As shown, taking the example that the first original optical signal is the optical signal transmitted by the optical beam splitter 4131, and the second original optical signal is the optical signal reflected by the optical beam splitter 4131, in this case, the first original optical signal is the initial optical signal output by the light source assembly 41, and the second original optical signal is reflected to the optical detector 4132 and is used to determine whether the actual output power of each optical pulse signal in the original optical signal generated by the light source 411 meets the rated requirements.

[0126] The optical detector 4132 is used to receive the second original optical signal reflected by the optical beam splitter 4131 and convert the optical pulse signal in the second original optical signal into an electrical signal, thereby obtaining the light intensity information of the optical pulse signal in the second original optical signal. Then, the optical detector 4132 sends the detected light intensity information to the processor 4133.

[0127] Optionally, the light detector 4132 may be a photoelectric sensor, for example, a charge coupled device (CCD), which is not limited to this.

[0128] The processor 4133 is used to receive the light intensity information sent by the light detector 4132, and determine the actual output power of the optical pulse signal in the original optical signal generated by the light source 411 based on the light intensity information. Then, the processor 4133 can determine whether the actual output power meets the rated requirement based on the determined actual output power.

[0129] When the processor 4133 determines that the actual output power does not meet the rated requirements, a power adjustment signal is generated based on the actual output power and the power of the optical pulse signal pre-acquired by the light source 411. Specifically, the processor 4133 can generate a power adjustment signal based on the difference between the actual output power and the power of the optical pulse signal pre-acquired by the light source 411.

[0130] Then, the processor 4133 may send the power adjustment signal to the light source 411. In this way, the light source 411 may adjust the parameters of the light source 411 according to the power adjustment signal so that the output power of the next optical pulse signal generated by the light source 411 meets the rated requirement.

[0131] It should be noted that if the light source assembly 41 includes an optical power adjustment module 413, when the light source 411 generates the original optical signal, if the optical pulse signal in the original optical signal is used to write the data to be written, the power of the optical pulse signal pre-acquired by the light source 411 is greater than the above-mentioned first preset power. If the optical pulse signal in the original optical signal is used to write the servo point, the power of the optical pulse signal pre-acquired by the light source 411 is greater than the above-mentioned second preset power. This is because the optical beam splitter 4131 in the optical power module 413 needs to separate a part of the optical pulse signal generated by the light source 411 to determine whether the actual output power of the optical pulse signal in the original optical signal generated by the light source 411 meets the rated requirements. This will not be elaborated.

[0132] Continue to refer Figure 4 , the optical deflector 42 is used to receive the first optical signal and deflect the first optical signal.

[0133] A possible implementation is Figure 4 As shown, the optical deflector 42 can receive the initial optical signal generated by the light source assembly 41 coaxial with the optical deflector 42. In this case, no other optical device is required between the optical deflector 42 and the light source assembly 41. In other words, the initial optical signal generated by the light source assembly 41 is the first optical signal.

[0134] Another possible implementation is Figure 6 As shown, the deflector 42 can receive an initial light signal generated by the light source assembly 41 having an optical axis different from that of the light deflector 42 .

[0135] In this case, the data reading and writing system 40 may further include a reflector 46. The reflector 46 is used to reflect the initial light signal generated by the light source assembly 41 to the light deflector 42. In this case, the light deflector 42 can receive the initial light signal generated by the light source assembly 41 reflected by the reflector 46. In this case, the light signal after the initial light signal generated by the light source assembly 41 is reflected by the reflector 46 is the above-mentioned first light signal.

[0136] It can be seen that, in this case, the reflector 46 deflects the propagation direction of the initial light signal. Figure 6 As shown, the reflector 46 deflects the propagation direction of the initial optical signal by 90°.

[0137] It should be noted that, since the initial optical signal is a pulse optical signal, the first optical signal is also a pulse optical signal.

[0138] Optionally, the reflector 46 may be a flat reflector or a prism reflector, which is not limited.

[0139] It should be noted that Figure 6 The arrangement position of the reflector 46 shown in FIG. 1 is only for illustrative purposes and is not limited thereto.

[0140] It should be understood that the optical deflector 42 can be any type of optical deflector. Here, the relevant description of the optical deflector can refer to the above description, which is not repeated here. For the convenience of description, in the embodiment of the present application, the optical deflector 42 is an acousto-optic deflector as an example for description.

[0141] Specifically, based on the above description of the acousto-optic deflector, it can be known that the optical deflector 42 can deflect the first optical signal received within the preset period in sequence at multiple angles to obtain multiple second optical signals. The multiple angles correspond to the multiple second optical signals one by one. The multiple angles are the emission angles of the multiple second optical signals, and the emission angles can be the angles between the multiple second optical signals and the first optical signal, respectively, without limitation. Among them, the relevant description of the preset period can refer to the description of the preset period above, which will not be repeated here.

[0142] It should be noted here that, since the first optical signal is a pulse optical signal, the plurality of second optical signals are optical signals obtained after a plurality of optical pulse signals in the first optical signal are sequentially deflected by the optical deflector 42 within a preset period.

[0143] It should be understood that the optical deflector 42 in the embodiment of the present application can generally deflect the optical signal in a one-dimensional plane. Therefore, the multiple second optical signals obtained after the optical deflector 42 deflects the first optical signal are in one plane.

[0144] Exemplary, reference Figure 7 , Figure 7 FIG. 4 is a schematic diagram showing that the optical deflector 42 deflects three optical pulse signals in the first optical signal received within a preset period to different angles in sequence according to the direction shown in direction 1. Figure 7 As shown, the optical deflector 42 can receive the optical pulse signal 1 in the first optical signal at time 1, and deflect it by angle 1 to obtain optical signal 1. Similarly, the optical deflector 42 can receive the optical pulse signal 2 in the first optical signal at time 2, and deflect it by angle 2 to obtain optical signal 2. The optical deflector 42 can receive the optical pulse signal 3 in the first optical signal at time 3, and deflect it by angle 3 to obtain optical signal 3. Among them, optical signal 1, optical signal 2 and optical signal 3 are three second optical signals.

[0145] Among them, Angle 1 can be the angle between optical pulse signal 1 and optical signal 1 in the first optical signal, Angle 2 can be the angle between optical pulse signal 2 and optical signal 2 in the first optical signal, and Angle 3 can be the angle between optical pulse signal 3 and optical signal 3 in the first optical signal.

[0146] It should be understood that the angle between the optical signal 1 and the optical signal 3 is less than or equal to the angle range (eg, Δθ in the above text) that the acousto-optic deflector 42 can deflect when deflecting the optical signal.

[0147] The read / write optical head 43 is used to focus the received multiple second optical signals on the optical storage medium 44 in sequence, so as to achieve the writing of multiple data points.

[0148] It should be understood that, since the multiple second optical signals are in one plane, the multiple data points written on the optical storage medium 44 by the multiple second optical signals focused by the read / write optical head 43 are arranged linearly.

[0149] The optical head 43 can be any optical device with focusing function, such as lens, objective lens, etc., without limitation. Here, the lens can be any lens such as single lens, combined lens, spherical lens, etc., without limitation.

[0150] For example, Figure 7 As shown, after receiving the optical signal 1, the read / write optical head 43 can focus the optical signal on point A on the optical storage medium 44, thereby writing the data point A. Similarly, after receiving the optical signal 2, the read / write optical head 43 can focus the optical signal on point B on the optical storage medium 44, thereby writing the data point B. After receiving the optical signal 3, the read / write optical head 43 can focus the optical signal on point C on the optical storage medium 44, thereby writing the data point C. It can be seen that the read / write optical head 43 writes data point A, data point B, and data point C on the optical storage medium 44 in the direction shown by direction 1 at different times. It can be seen that the data point A, data point B, and data point C are arranged linearly.

[0151] In a possible implementation, the optical storage medium 44 is stationary, and the data points written on the optical storage medium 44 by the read / write optical head 43 are linearly arranged in the direction in which the optical deflector 42 deflects the first optical signal.

[0152] For example, Figure 8 As shown in (a) in the figure, data points A, B and C written by the read / write optical head 43 on the circular optical storage medium 44 are linearly arranged in sequence along the direction (direction 1) of the deflection of the first light signal by the optical deflector 42.

[0153] like Figure 8As shown in (c) in the figure, data points A, B and C written by the read / write optical head 43 on the rectangular optical storage medium 44 are linearly arranged in sequence along the direction (direction 1) in which the optical deflector 42 deflects the first optical signal.

[0154] In another possible implementation, the optical storage medium 44 is in motion, and the data points written by the optical head 43 on the optical storage medium 44 are linearly arranged in a direction having a preset angle with the direction in which the optical deflector 42 deflects the first optical signal. Here, the preset angle is proportional to the moving speed of the optical storage medium 44.

[0155] In this case, the data reading and writing system 40 may further include a first moving platform 45, and the first moving platform 45 is used to control the optical storage medium 44 to rotate or translate on a plane perpendicular to the axial direction of the read-write optical head 43. The axial direction of the read-write optical head 43 refers to the direction in which the optical axis of the read-write optical head 43 is located. For simple description, the embodiment of the present application abbreviates the "axial direction of the read-write optical head 43" as "axial direction".

[0156] When the first moving platform 45 is used to control the optical storage medium 44 to rotate on a plane perpendicular to the axial direction, the first moving platform 45 can be a rotating platform. When the first moving platform 45 is used to control the optical storage medium 44 to translate on a plane perpendicular to the axial direction, the first moving platform 45 can be a one-dimensional or multi-dimensional linear motion platform, which is not limited.

[0157] For example, Figure 8 As shown in (b) in FIG. 1 , when the first moving platform 45 controls the circular optical storage medium 44 to move along Figure 8 When rotating in the direction shown in (b), the data points A, B and C written by the read / write optical head 43 on the optical storage medium 44 are linearly arranged in sequence along a direction 2 having a preset angle α with the direction 1 in which the optical deflector 42 deflects the first light signal.

[0158] like Figure 8 As shown in (d) in FIG. 1 , when the first moving platform 45 controls the rectangular optical storage medium 44 to move along Figure 8 When the moving direction shown in (b) is translated, the data points A, B and C written by the read / write optical head 43 on the optical storage medium 44 are linearly arranged in sequence along the direction 3 having a preset angle β with the direction 1 in which the optical deflector 42 deflects the first light signal.

[0159] In this way, during the continuous movement of the optical storage medium 44, the read / write optical head 43 can receive multiple second optical signals in each of multiple preset cycles, and focus the multiple second optical signals on the optical storage medium 44 in turn to achieve writing of multiple data tracks.

[0160] The number of the plurality of data tracks corresponds to the number of the plurality of second optical signals obtained by deflecting the first optical signal by the optical head 43 within a preset period, that is, the number of the plurality of data tracks corresponds to the number of the plurality of data points written by the plurality of second optical signals sequentially focused on the optical storage medium 44 by the optical head 43. Furthermore, the plurality of data tracks includes the plurality of data points, and each data track in the plurality of data tracks passes through one data point in the plurality of data points, that is, the plurality of data tracks and the plurality of data points correspond one to one.

[0161] In this case, the multiple data tracks can constitute a data band. In this way, the single beam light signal (i.e., the initial light signal) generated by the light source assembly 41 can be written into multiple data tracks on the optical storage medium 44 in parallel through the optical path of the data reading and writing system 40, thereby improving the data reading and writing efficiency.

[0162] For example, Figure 8 As shown in (b) in FIG. 1 , when the first moving platform 45 controls the circular optical storage medium 44 to move along Figure 8 When the optical head 43 rotates in the direction of rotation shown in (b), the data points written by the optical head 43 in a preset cycle include data point A, data point B, and data point C. Then, the optical head 43 can write three data tracks (including data track 1, data track 2, and data track 3) on the optical storage medium 44 in multiple preset cycles. Among them, data track 1 passes through data point A, data track 2 passes through data point B, and data track 3 passes through data point C. Here, the three data tracks can constitute a ring-shaped data band, for example Figure 4 or Figure 6 It should be understood that in Figure 4 or Figure 6 The data band 441 shown in FIG. 4 is a cross-sectional view of the data band.

[0163] like Figure 8 As shown in (d) in FIG. 1 , when the first moving platform 45 controls the rectangular optical storage medium 44 to move along Figure 8 When the moving direction shown in (b) is translated, the data points written by the read / write optical head 43 in a preset cycle include data point A, data point B, and data point C. Then, the read / write optical head 43 can write three data tracks (including data track 1, data track 2, and data track 3) on the optical storage medium 44 in multiple preset cycles. Among them, data track 1 passes through data point A, data track 2 passes through data point B, and data track 3 passes through data point C. Here, the three data tracks can constitute a rectangular data band.

[0164] It should be understood that the number of data points on each of the above-mentioned multiple data tracks is the same as the number of preset cycles required for the read / write optical head 43 to write the multiple data tracks on the optical storage medium 44 .

[0165] Exemplarily, if the optical read / write head 43 writes the plurality of data tracks on the optical storage medium 44 within m preset cycles, the number of data points on each of the plurality of data tracks is m. Here, m is a positive integer.

[0166] It should be understood that if the optical storage medium 44 is an optical storage medium including multiple storage layers, the above-mentioned first movable platform 45 can also be used to control the movement of the optical storage medium 44 in the axial direction, so as to enable the read-write optical head 43 to focus multiple second optical signals on different storage layers of the optical storage medium 44, thereby realizing the writing of the above-mentioned data band on each storage layer.

[0167] Optional, combined Figure 5 ,refer to Fig. 9 The data reading and writing system 40 may further include a radial moving stage 91, which is disposed on the main support 92, and the optical deflector 42, the reflector 46, and the read / write optical head 43 may also be disposed on the main support 92 through devices such as an optical frame. In this case, the radial moving stage 91 may be used to move the optical deflector 42, the reflector 46, and the read / write optical head 43 by a first preset distance in a plane perpendicular to the axial direction after the read / write optical head 43 completes writing of a first data band on a first storage layer among multiple storage layers of the optical storage medium 44, so as to write a second data band in the first storage layer.

[0168] The first preset distance is greater than the width of the first data band. The embodiment of the present application does not specifically limit the value of the first preset distance.

[0169] The first data band and the second data band may be two adjacent data bands or two non-adjacent data bands, and this is not limited.

[0170] It should be understood that if the light source assembly 41 and the read / write optical head 43 in the data read / write system 40 have the same optical axis, the light source assembly 41 can also be disposed on the main bracket 92. In this case, the radial moving stage 91 can be used to move the light source assembly 41, the light deflector 42, the reflector 46 and the read / write optical head 43 by a first preset distance in a plane perpendicular to the axial direction after the read / write optical head 43 completes writing of a first data band on a first storage layer among multiple storage layers of the optical storage medium 44, so as to achieve writing of a second data band in the first storage layer.

[0171] Exemplary, reference Fig.10 , Fig.10It shows a schematic diagram of the data reading and writing system 40 controlling the radial moving stage 91 to move a preset distance to achieve writing of different data bands.

[0172] like Fig.10 As shown in (a) of FIG. 1 , after the data reading and writing system 40 writes the annular data band 1 on the optical storage medium 44, the radial moving stage 91 can be controlled to move a preset distance d1 in a direction perpendicular to the axial direction (i.e., radial direction), thereby realizing the writing of the annular data band 2. Wherein, d1 is greater than or equal to the width of the data band 1.

[0173] like Fig.10 As shown in (b), after the data reading and writing system 40 writes the rectangular data band 1 on the optical storage medium 44, the data reading and writing system 40 can control the radial moving stage 91 to move a preset distance d2 in a direction perpendicular to the axial direction (i.e., radial direction), thereby realizing the writing of the rectangular data band 2. Wherein, d2 is greater than or equal to the width of the data band 1.

[0174] It should be understood that the data band written by the data reading and writing system 40 in the optical storage medium 44 through the optical head 43 includes data points for storing data and data points used as servo points. Here, the servo point is used to adjust the position of the focus of the optical signal focused by the optical head 43. In the embodiment of the present application, the data track including the servo point is referred to as the servo track.

[0175] In one data band, at least one servo track may be included. Any one of the at least one servo track may include multiple servo points. For the sake of simplicity, the following description of the embodiment of the present application takes one data band including one servo track as an example for explanation.

[0176] On the one hand, for the multiple servo points on the servo track in any data band in the optical storage medium 44, the multiple servo points can be distributed on the servo track continuously or discretely, and there is no limitation on this.

[0177] If the plurality of servo points are discretely distributed on the servo track, the plurality of servo points may be evenly distributed on the servo track at intervals of a second preset distance. Of course, the plurality of servo points may also be randomly and discretely distributed on the servo track, which is not limited thereto. The distance between any two adjacent servo points in the plurality of servo points is less than or equal to a second preset threshold value, and the embodiment of the present application does not specifically limit the values ​​of the second preset distance and the second preset threshold value.

[0178] On the other hand, for the optical storage medium 44 including multiple storage layers, the servo points on each storage layer in the multiple storage layers are discretely distributed in the axial direction. For the convenience of description, the following description is based on the example that the optical storage medium 44 includes p (p is an integer greater than 1) storage layers.

[0179] In a first possible implementation, in the p storage layers included in the optical storage medium 44, the servo tracks in the data bands located on each storage layer and overlapping in the axial direction overlap in the axial direction. Furthermore, for the first storage layer and the second storage layer separated by q (q is a positive integer greater than 1) storage layers in the p storage layers, if the first servo track on the first storage layer and the second servo track on the second storage layer overlap in the axial direction, then a straight line passing through any servo point on the first servo track and parallel to the axial direction also passes through a servo point on the second servo track. The first servo track is any servo track on the first storage layer, and the second servo track is a servo track in the second storage layer that overlaps with the first servo track in the axial direction.

[0180] If any one of the first storage layer and the second storage layer is the third storage layer, and the third servo track on the third storage layer overlaps with the first servo track in the first storage layer (or the second servo track in the second storage layer) in the axial direction, then a straight line passing through any servo point on the third servo track and parallel to the axial direction does not pass through the servo points on the first storage layer, the second storage layer, and any storage layer between the first storage layer and the second storage layer except the third storage layer. This means that the servo points on each storage layer between the first storage layer and the storage layer before the second storage layer do not overlap in the axial direction.

[0181] In this case, for the above-mentioned p storage layers, the servo points on the p storage layers are discretely distributed with an interval of q storage layers in the axial direction, and the servo points on any servo track on each storage layer are discretely distributed.

[0182] As an example, see Fig.11 , Fig.11 The schematic diagram of the discrete distribution of servo points on a circular servo track overlapping in the axial direction is shown as an example. Fig.11 (a) in FIG. 1 shows a front view of 16 circular servo tracks overlapping in the axial direction. Fig.11 As shown in (a), the 16 servo tracks overlapping in the axial direction include: servo track 1-1 on storage layer 1, servo track 2-1 on storage layer 2, servo track 3-1 on storage layer 3, servo track 4-1 on storage layer 4, servo track 5-1 on storage layer 5, ... and servo track 16-1 on storage layer 16.

[0183] like Fig.11 As shown in (a), servo track 1-1 (i.e., the first servo track mentioned above) and servo track 5-1 (i.e., the second servo track mentioned above) are separated by three storage layers (respectively, storage layer 2, storage layer 3, and storage layer 4), and the servo point s1-1 on servo track 1-1 and the servo point s5-1 on servo track 5-1 overlap in the axial direction. The straight line L1 passing through the servo point s2-1 on servo track 2-1 and parallel to the axial direction, the straight line L2 passing through the servo point s3-1 on servo track 3-1 and parallel to the axial direction, and the straight line L3 passing through the servo point s4-1 on servo track 4-1 and parallel to the axial direction do not pass through any servo point on storage layer 1, storage layer 2, storage layer 3, and storage layer 4. In other words, the servo points on each storage layer between storage layer 1 and storage layer 4 do not overlap in the axial direction. Among them, the axial direction is Fig.11 The direction shown by the optical axis 110.

[0184] Fig.11 (b) shows Fig.11 FIG. 16 (a) shows a top view of 16 circular servo tracks overlapping in the axial direction. Fig.11 As shown in (b), servo point s1-1 and servo point s1-2 are servo points on servo track 1-1 in storage layer 1, servo point s2-1 and servo point 2-2 are servo points on servo track 2-1 in storage layer 2, servo point s3-1 and servo point 3-2 are servo points on servo track 3-1 in storage layer 3, and servo point s4-1 and servo point 4-2 are servo points on servo track 4-1 in storage layer 4.

[0185] It can be seen that servo point s1-1, servo point s2-1, servo point s3-1 and servo point s4-1 do not overlap in the axial direction. Servo point s1-1 and servo point s1-2 on servo track 1-1 are discretely distributed with 3 data points in the radial direction. Servo point s2-1 and servo point s2-2 on servo track 2-1 are discretely distributed with 3 data points in the radial direction. Servo point s3-1 and servo point s3-2 on servo track 3-1 are discretely distributed with 3 data points in the radial direction. Servo point s4-1 and servo point s4-2 on servo track 4-1 are discretely distributed with 3 data points in the radial direction. Here, the radial direction refers to the direction perpendicular to the axial direction.

[0186] Similarly, the servo point s5-1 on the servo track 5-1 and the servo point s9-1 on the servo track 9-1 overlap in the axial direction, and the servo points on each storage layer between the storage layer 5 and the storage layer 8 do not overlap in the axial direction. The servo point s9-1 on the servo track 9-1 and the servo point s13-1 on the servo track 13-1 overlap in the axial direction, and the servo points on each storage layer between the storage layer 9 and the storage layer 12 do not overlap in the axial direction. The servo points on each storage layer between the storage layer 13 and the storage layer 16 do not overlap in the axial direction. In this way, for the above 16 storage layers, the servo points on the servo tracks that overlap in the axial direction on the 16 storage layers are discretely distributed with an interval of 3 storage layers in the axial direction.

[0187] It should be understood that for any one of the p servo tracks that overlap in the axial direction on the p storage layers, the positions of the data points between the discretely distributed servo points on the servo track are empty, that is, nothing is written to these positions. In this way, when the data reading and writing system 40 reads data, the attenuation of the optical signal used for reading data can be effectively reduced when it acts on the servo point on the storage layer far away from the surface of the optical storage medium 44, so that the data reading and writing system 40 can accurately read the servo point on the storage layer far away from the surface of the optical storage medium 44, thereby effectively improving the servo efficiency of the data reading and writing system 40.

[0188] For example, Fig.11 As shown in (a), when the optical signal used to read data passes through storage layers 1 to 12 and then acts on the servo point s13-1 in storage layer 13, in this case, the optical power of the optical signal attenuates to a certain extent when passing through three servo points (the servo point s1-1 on storage layer 1, the servo point s5-1 on storage layer 5, and the servo point s9-1 on storage layer 9). In the storage layers 1 to 12, except for storage layers 1, 5, and 9, the positions of the data points that coincide with the servo point s13-1 in the axial direction do not have data content written, that is, the reflectivity of the positions of these data points on the storage layer does not change. In this way, when the optical signal passes through the positions of these data points when acting on s13-1, the optical power attenuation of the optical signal will be greatly reduced. In this way, the accuracy of the optical signal in reading the servo point s13-1 will be improved, thereby effectively improving the servo efficiency of the system.

[0189] In a second possible implementation, in the p storage layers included in the optical storage medium 44, the servo tracks in the data bands that overlap in the axial direction on each storage layer do not overlap in the axial direction. In this case, the servo points on each storage layer in the p storage layers do not overlap in the axial direction.

[0190] It is understandable that, in this case, the servo points on any servo track in the optical storage medium 44 can be distributed discretely or continuously, and there is no limitation on this. When the servo points on the servo track are distributed discretely, the distance between any two adjacent servo points on the servo track is less than or equal to the second preset threshold.

[0191] As an example, refer to Fig.12 , Fig.12 The schematic diagram exemplarily shows a situation in which, among multiple storage layers, servo tracks in data bands that overlap in the axial direction on each storage layer do not overlap in the axial direction.

[0192] in, Fig.12 (a) in FIG. 1 shows a front view of five annular data bands (hereinafter referred to as data rings) overlapping in the axial direction. Fig.12 As shown in (a), data ring 1-1 is a data ring on storage layer 1, data ring 2-1 is a data ring on storage layer 2, data ring 3-1 is a data ring on storage layer 3, data ring 4-1 is a data ring on storage layer 4, and data ring 5-1 is a data ring on storage layer 5. It can be seen that data ring 1-1, data ring 2-1, data ring 3-1, data ring 4-1 and data ring 5-1 overlap in the axial direction. The axial direction is Fig.12 The direction shown by the optical axis 120.

[0193] Fig.12 (b) shows Fig.12 FIG. 1 is a front view of five circular servo tracks on the data rings that overlap in the axial direction and do not overlap in the axial direction as shown in (a). It should be understood that the servo tracks on the data rings are usually circular servo tracks. Fig.12 As shown in (b), servo track 1-1 is the servo track in data ring 1-1, servo track 2-1 is the servo track in data ring 2-1, servo track 3-1 is the servo track in data ring 3-1, servo track 4-1 is the servo track in data ring 4-1, and servo track 5-1 is the servo track in data ring 5-1.

[0194] It can be seen that the radius of servo track 1-1 differs from the radius of servo track 2-1 by d1, the radius of servo track 2-1 differs from the radius of servo track 3-1 by d2, the radius of servo track 3-1 differs from the radius of servo track 4-1 by d3, and the radius of servo track 4-1 differs from the radius of servo track 5-1 by d4. Here, the values ​​of d1, d2, d3 and d4 can be the same or different, and there is no limitation on this. That is to say, servo track 1-1, servo track 2-1, servo track 3-1, servo track 4-1 and servo track 5-1 do not overlap in the axial direction. In this case, the servo points on servo track 1-1, servo track 2-1, servo track 3-1, servo track 4-1 and servo track 5-1 do not overlap in the axial direction, that is, the servo points on data ring 1-1, data ring 2-1, data ring 3-1, data ring 4-1 and data ring 5-1 do not overlap in the axial direction.

[0195] To explain more clearly, Fig.12 (c) in FIG. 1 shows a top view of the five data rings overlapping in the axial direction and the circular servo bands not overlapping in the axial direction on the five data rings. Fig.12 As shown in (c), data ring 1-1, data ring 2-1, data ring 3-1, data ring 4-1 and data ring 5-1 overlap in the axial direction, and servo track 1-1, servo track 2-1, servo track 3-1, servo track 4-1 and servo track 5-1 do not overlap in the axial direction. That is, the servo points on servo track 1-1, servo track 2-1, servo track 3-1, servo track 4-1 and servo track 5-1 do not overlap in the axial direction.

[0196] It should be understood that in a data track that coincides with any servo track in the axial direction on any one of the p storage layers, the data points in the data track are empty, that is, the data read-write system 40 does not write anything on the data track. Through this design, when the data read-write system 40 reads data, the optical signal used to read data can effectively reduce the attenuation of the optical signal when it acts on the servo point on the storage layer far away from the surface of the optical storage medium 44, so that the servo point on the storage layer far away from the surface of the optical storage medium 44 can be accurately read, thereby improving the servo efficiency of the system. For specific instructions, please refer to the description of improving the servo efficiency of the system in the first possible implementation above, which will not be repeated here.

[0197] It should be noted that when the optical storage medium 44 includes a large number of storage layers (for example, the optical storage medium 44 may have 50 layers, 100 layers, etc., which is not limited), the data point reading and writing system 40 may adopt the first possible implementation method and the second possible implementation method to write the servo points. In this case, the optical storage medium 44 may record data in a reflective light type. In this case, by laying out the servo points in these two ways, the servo efficiency of the data reading and writing system 40 when reading data can be effectively improved.

[0198] In a third possible implementation, in the p storage layers included in the optical storage medium 44, the servo tracks in the data bands that overlap in the axial direction on each storage layer overlap in the axial direction.

[0199] In this case, the servo points on any servo track in the optical storage medium 44 may be distributed discretely or continuously, without limitation. When the servo points on the servo track are distributed discretely, the distance between any two adjacent servo points on the servo track is less than or equal to the second preset threshold.

[0200] As an example, refer to Fig.13 , Fig.13 The schematic diagram of the distribution of servo points on a circular servo track that overlaps in the axial direction is shown as an example. Fig.13 (a) in FIG. 1 shows a front view of eight circular servo tracks overlapping in the axial direction. Fig.13 As shown in (a), the servo track on storage layer 1 is servo track 1-1, the servo track on storage layer 2 is servo track 2-1, ..., and the servo track on storage layer 8 is servo track 8-1. It can be seen that servo track 1-1, servo track 2-1, ..., and servo track 8-1 overlap in the axial direction. The axial direction is Fig.13 The direction shown by the optical axis 130.

[0201] Fig.13 (b) in FIG. 1 shows a top view of eight circular servo tracks overlapping in the axial direction. Fig.13 As shown in (b) in FIG. 1 , on any of the servo tracks that overlap in the axial direction, the servo point can be as follows: Fig.13 The continuous distribution shown in (b) can of course also be a discrete distribution, and there is no limitation on this.

[0202] It should be noted that when the optical storage medium 44 includes a large number of storage layers (for example, the optical storage medium 44 may have 50 layers, 100 layers, etc., which are not limited to this), the data point reading and writing system 40 may use the third possible implementation method to write the servo points. In this case, the optical storage medium 44 may record data in a self-fluorescence manner. In this case, by laying out the servo points in this manner, the servo efficiency of the data reading and writing system 40 when reading data can be effectively improved. The relevant description of the self-fluorescence type can be referred to above and will not be repeated here.

[0203] Of course, when the optical storage medium 44 includes fewer storage layers and the data reading and writing system 40 uses the third possible implementation method to layout the written servo points, the optical storage medium 44 can also record data in a reflective light type.

[0204] It should be understood that, as described above, the data reading and writing system 40 realizes writing data points at different positions on the optical storage medium 44 at different times by respectively deflecting the optical signal in a plurality of preset periods and during the movement of the optical storage medium 44. Therefore, the data reading and writing system 40 can realize writing of the servo points arranged in any of the above possible implementations on the optical storage medium 44 by controlling the light source assembly 41 to generate the power of the initial optical signal for writing the servo points at a plurality of preset times. The plurality of preset times correspond one-to-one to the servo points arranged in any of the above possible implementations.

[0205] At this point, when writing data, the data reading and writing system provided by the embodiment of the present application can be simply understood as the data reading and writing system sequentially deflects the first optical signal obtained by modulating the initial optical signal generated by the light source component through the optical deflector, so as to achieve writing a row of data points on the optical storage medium within a preset period. At the same time, the data reading and writing system controls the movement of the optical storage medium, thereby achieving writing of multiple rows of data points on the optical storage medium along the moving direction of the optical storage medium within multiple preset periods, thereby achieving writing of a data band including multiple data tracks. In other words, the data reading and writing system provided by the embodiment of the present application writes data on a moving optical storage medium, thereby achieving the effect of simultaneously writing multiple data tracks on the optical storage medium by controlling a single beam of optical signal, that is, achieving the effect of writing data in parallel on the optical storage medium by a single beam of optical signal. In this way, the embodiment of the present application improves the efficiency of writing data by the data reading and writing system without increasing the rotation speed of the optical storage medium.

[0206] Furthermore, when the data reading and writing system 40 provided in the embodiment of the present application is used to read data, it also includes an optical signal separation module and an information processing module.

[0207] Combination Fig. 9 ,refer to Fig.14 ,like Fig.14 As shown, the data reading and writing system 40 further includes an optical signal separation module 141 and an information processing module 142 .

[0208] It should be understood that when the data reading and writing system 40 is used to read data stored on the optical storage medium 44, the data stored on the optical storage medium 44 is written through the optical path of the data reading and writing system 40 described above.

[0209] It should be understood that when the data reading and writing system 40 is used to read data, the relevant description of the light source assembly 41, the reflector 46, the light deflector 42, the read-write optical head 43 and the radial moving stage 91 in the data reading and writing system 40 can refer to the relevant description of the light source assembly 41, the reflector 46, the light deflector 42, the read-write optical head 43 and the radial moving stage 91 when the data reading and writing system 40 is used to write data in the above text, and will not be repeated here.

[0210] It should be noted that when the data reading and writing system 40 is used to read data, the initial light signal generated by the light source assembly 41 passes through the reflector 46 and the light deflector 42, and the multiple second light signals are sequentially focused on the optical storage medium 44 by the read-write optical head 43, and the physical and / or chemical properties thereof will not be changed. The embodiment of the present application is described by taking the power of the initial light signal generated by the light source assembly 41 as the third preset power when the data reading and writing system 40 is used to read data as an example. It should be understood that when the light signal with the third preset power acts on the optical storage medium 44, the physical and / or chemical properties thereof will not be changed.

[0211] Optionally, the optical read / write head 43 may be disposed on the second movable platform 143. The second movable platform 143 may be used to move the optical read / write head 43 in the axial direction, thereby adjusting the focal position of the optical signal focused by the optical read / write head 43 in the axial direction.

[0212] The second mobile platform 143 can receive the axial servo signal sent by the processor 1422 in the signal processing module 142, and then can move the read / write optical head 43 in the axial direction according to the instruction of the axial servo signal, so as to adjust the position of the focus of the optical signal focused by the read / write optical head 43 in the axial direction. Here, the relevant description of the axial servo signal can be referred to below, which will not be repeated here.

[0213] As an example, the second moving platform 143 may be a one-dimensional electric direct motion platform, such as a z-axis electric platform, but is not limited thereto.

[0214] Optionally, the reflector 46 can be disposed on the third movable platform 144. The third movable platform 144 can be used to move the reflector 46 in a radial direction (hereinafter referred to as radial direction) perpendicular to the axial direction, thereby adjusting the focus position of the optical signal focused by the read / write optical head 43 in the radial direction.

[0215] The third moving platform 144 can receive the radial servo signal sent by the processor 1422 in the signal processing module 142, and then can move the reflector 46 in the radial direction according to the instruction of the radial servo signal, so as to adjust the position of the focus of the optical signal focused by the read / write optical head 43 in the radial direction. Here, the relevant description of the radial servo signal can be referred to below, which is not repeated here.

[0216] As an example, the third moving platform 144 may be a two-dimensional electric linear motion platform, such as an xy-axis electric platform, but is not limited thereto.

[0217] As an example, combining Fig.14 ,refer to Fig.15 , Fig.15 The schematic diagram shows that the reflective mirror 46 is moved by the third movable platform 144 so as to adjust the position of the focus of the optical signal focused by the read / write optical head 43 in the radial direction.

[0218] like Fig.15 As shown in (a), when the reflector 46 is in position 1, the reflector 46 reflects the initial light signal incident from the light source assembly 41 to obtain a reflected light signal 1. The reflected light signal 1 acts on the optical storage medium 44 via the optical signal separation module 141, the optical deflector 42, and the read / write optical head 43 to read the data point 1 on the optical storage medium 44. It should be understood that the position of the data point 1 is the position of the focal point when the read / write optical head 43 focuses the light signal when the reflector 46 is in position 1.

[0219] When the third mobile platform 144 ( Fig.15 The reflector 46 is controlled to move to position 2 along the x-axis in the plane where the radial direction is located (not shown). In this case, after the reflector 46 reflects the initial light signal incident from the light source assembly 41, a reflected light signal 2 can be obtained. In this way, the reflected light signal 2 acts on the optical storage medium 44 via the optical signal separation module 141, the optical deflector 42, and the read / write optical head 43, so that the data point 2 can be read from the optical storage medium 44. It should be understood that the position of the data point 2 is the position of the focus when the read / write optical head 43 focuses the light signal when the reflector 46 moves to position 2.

[0220] It can be seen that the third moving platform 144 controls the reflector 46 to move in the radial direction, so as to move the focus position of the optical signal focused by the read / write optical head 43 in the radial direction.

[0221] in, Fig.15 (b) in the figure schematically shows the schematic diagram of the axial direction and the radial direction. Fig.15 As shown in (b), the z-axis is the axial direction of the read / write optical head 43, and the plane where the x-axis and the y-axis are located is the plane perpendicular to the axial direction. Therefore, the x-axis and the y-axis are radial directions.

[0222] Continue to refer Fig.14 The optical signal separation module 141 is used to separate the optical signal returned by the optical storage medium 44 after being acted on from the optical path where the optical signal for acting on the optical storage medium 44 is located when the data reading and writing system 40 is used to read data, so as to obtain a third optical signal.

[0223] It should be understood that the optical path of the optical signal acting on the optical storage medium 44 is usually opposite to the optical path of the optical signal returned after the optical storage medium 44 is acted on. Here, the opposite optical path means that the optical path channels are the same, but the propagation directions of the optical signals are opposite.

[0224] For example, Fig.14 As shown in FIG. 2 , the optical signal for reading data can act on the optical storage medium 44 along the direction shown in direction 2. Then, after the optical storage medium 44 is acted by the optical signal, the optical signal returned by the optical storage medium 44 can be Fig.13 The optical signal is returned in the direction shown in FIG. 3 and is separated from the optical path of the optical signal used to act on the optical storage medium 44 by the optical signal separation module 141 to obtain a third optical signal.

[0225] In one possible case, if the optical storage medium 44 records data in a self-fluorescence manner, the optical signal returned by the optical storage medium 44 is a fluorescence signal emitted autonomously by the optical storage medium 44 after the above-mentioned multiple second optical signals sequentially act on the optical storage medium 44. In this case, the optical signal separation module 141 includes a dichroic mirror. Here, the dichroic mirror can transmit long-wavelength laser light and reflect short-wavelength fluorescence light.

[0226] In this way, the optical signal returned by the optical storage medium 44 can be separated from the optical path of the optical signal acting on the optical storage medium by the dichroic mirror to obtain a third optical signal.

[0227] In another possible case, if the optical storage medium 44 records data in a reflective light type, the optical signal returned by the optical storage medium 44 is the optical signal reflected by the optical storage medium 44 after the above-mentioned multiple second optical signals act on the optical storage medium 44 in sequence. In this case, the optical signal separation module 141 may include a polarizing beam splitter 1411 and a wavelength plate 1412. In this case, the optical signal returned by the optical storage medium 44 can be separated from the optical path of the optical signal used to act on the optical storage medium 44 by the polarizing beam splitter 1411 and the wavelength plate 1412 to obtain a third optical signal.

[0228] The process of the optical signal for reading data acting on the optical storage medium 44 can refer to the process of the optical signal for writing data acting on the optical storage medium 44 described above, which will not be described in detail here.

[0229] The polarizing beam splitter 1411 is used to receive the initial optical signal reflected by the reflector 46 and transmit the initial optical signal to the wavelength plate 1412. In the embodiment of the present application, the optical signal transmitted to the wavelength plate 1412 is referred to as a fourth optical signal.

[0230] Specifically, the polarization beam splitter 1411 can be used to transmit the p-polarized light in the initial light signal and reflect the s-polarized light in the initial light signal after receiving the initial light signal. Here, the fourth light signal can be the p-polarized light or the s-polarized light, which is not limited. Fig.14 As shown, in the embodiment of the present application, the fourth optical signal is p-polarized light for illustration.

[0231] Exemplarily, the polarizing beam splitter 1411 may be a polarizing beam splitter prism, and of course, may be other polarizing beam splitters, which is not limited to this.

[0232] The wavelength plate 1412 is used to receive the fourth optical signal transmitted by the polarizing beam splitter 1411, and to adjust the phase of the fourth optical signal to output the first optical signal. Also, it is used to receive the optical signal returned by the optical storage medium 44 via the read / write optical head 43 and the optical deflector 42, and to adjust the phase of the optical signal to emit the fifth optical signal. Here, the deflection states of the fourth optical signal and the fifth optical signal are different. For example, if the fourth optical signal is p-polarized, the fifth optical signal is s-polarized, and if the fourth optical signal is s-polarized, the fifth optical signal is p-polarized. The embodiment of the present application is described by taking the fourth optical signal being p-polarized and the fifth optical signal being s-polarized as an example.

[0233] Among them, after the above-mentioned first optical signal is processed by the optical deflector 42 and the read-write optical head 43 and acts on the optical storage medium 44, the optical signal returned by the optical storage medium 44 is inversely processed by the read-write optical head 43 and the optical deflector 42 in turn, and then passes through the wavelength plate 1412 to obtain the fifth optical signal.

[0234] As an example, the wavelength plate 1412 may be a quarter wavelength plate. The quarter wavelength plate may shift the phase of the received optical signal by a quarter wavelength. Therefore, when the optical signal passes through the quarter wavelength plate twice in a row, the deflection state of the optical signal will change. For example, after the p-polarized light passes through the quarter wavelength plate twice in a row, it becomes an s-polarized light. Alternatively, after the s-polarized light passes through the quarter wavelength plate twice in a row, it becomes a p-polarized light.

[0235] In the data reading and writing system 40 provided in the embodiment of the present application, a wavelength plate 1412 is usually provided. When the optical signal acts on the optical storage medium 44 after passing through the wavelength plate 1412, the optical storage medium 44 can return the optical signal along the original path. In this way, the returned optical signal will pass through the wavelength plate 1412. In this way, it is equivalent to the optical signal passing through the wavelength plate 1412 twice in a row. In this case, if the fourth optical signal processed by the wavelength plate 1412 for the first time is p-polarized light, then the fourth optical signal acts on the optical storage medium 44 after passing through the wavelength plate 1412, the optical deflector 42 and the read-write optical head 43, and the optical storage medium 44 can return the optical signal along the original path and pass through the wavelength plate 1412 again to obtain the fifth optical signal, which is s-polarized light.

[0236] In this way, the polarization beam splitter 1411 can also be used to receive the fifth optical signal, and based on the polarization beam splitting principle, reflect and output the fifth optical signal, thereby obtaining the third optical signal mentioned above.

[0237] For example, the following is combined Fig.14 , the process of separating the optical signal returned by the optical storage medium 44 through the optical signal separation module 141 is described.

[0238] like Fig.14 As shown, after the initial light signal reflected by the reflector 46 reaches the polarizing beam splitter 1411, the p-polarized light in the initial light signal passes through the working surface of the polarizing beam splitter 1411 (i.e., the diagonal surface of the polarizing beam splitter 1411, Fig.14 As shown by the oblique lines in the square in FIG. 1 ), a fourth optical signal is obtained, and the fourth optical signal is p-polarized light.

[0239] Then, the fourth optical signal reaches the wavelength plate 1412 along direction 2, and passes through the wavelength plate 1412 to obtain the first optical signal whose phase changes by 1 / 4 wavelength. Next, after the first optical signal is deflected by the optical deflector 42 and focused on the optical storage medium 44 by the read-write optical head 43, the optical signal returned by the optical storage medium 44 can reach the wavelength plate 1412 along the direction 3 opposite to the direction 2. When the returned optical signal passes through the wavelength plate 1412, the fifth optical signal is obtained, and the phase of the fifth optical signal changes by 1 / 4 wavelength compared with the optical signal returned by the optical storage medium 44. That is, the phase of the fifth optical signal changes by 1 / 2 wavelength compared with the fourth optical signal. In this case, the fifth optical signal is s-polarized light.

[0240] Furthermore, the polarized beam splitter 1411 receives the fifth optical signal, and since the fifth optical signal is s-polarized light, the fifth optical signal is reflected and outputted by the working surface of the polarized beam splitter 1411, thereby obtaining the third optical signal mentioned above. In this way, the optical signal separation module 141 realizes separation of the optical signal returned by the optical storage medium 44 after being acted upon by the optical signal from the optical path of the optical signal used to act on the optical storage medium 44 by changing the polarization state of the optical signal and using the polarized beam splitter.

[0241] The information processing module 142 includes a light detector 1421 and a processor 1422. The processor 1422 may be Figure 5 The processor 4133 in the example may be the same processor or different processors, and there is no limitation on this.

[0242] The optical detector 1421 is used to receive the third optical signal separated by the optical signal separation module 141, convert the received third optical signal into an electrical signal, and send the electrical signal to the processor 1422 for processing. The processor 1422 can further process the electrical signal received from the optical detector 1421 to determine the data to be read or determine the servo control signal.

[0243] The light detector 1421 may be a photoelectric sensor, such as a CCD, which is not limited thereto.

[0244] Specifically, after receiving the third optical signal, the optical detector 1421 can determine the light intensity of the third optical signal and the light spot information of the light spot formed by the third optical signal on the optical detector 1421. The light spot information includes the light spot shape and the light spot size. Then, the optical detector 1421 can send the determined light intensity and light spot information of the third optical signal to the processor 1422 for further processing.

[0245] Then, in one case, if the third optical signal is an optical signal returned by the data reading and writing system 40 after acting on a data point for storing data on the optical storage medium 44, the third optical signal is a data optical signal. In this case, the processor 1422 can decode the third optical signal based on the light intensity of the third optical signal and the preset decoding rule to obtain the data to be read.

[0246] It should be understood that the data stored in the data reading and writing system 40 is the data obtained after the data to be read is encoded according to the preset encoding rule. Therefore, the data reading and writing system 40 is preset with a decoding rule corresponding to the encoding rule. In this way, when the data reading and writing system 40 reads the data to be read, the data read from the optical storage medium can be decoded based on the preset decoding rule to obtain the data to be read.

[0247] In another case, if the third optical signal is an optical signal returned by the data reading and writing system 40 after acting on a servo point on the optical storage medium 44, the third optical signal is a servo optical signal. In this case, the processor 1422 can generate a servo control signal based on the preset information of the servo point and the light intensity and spot information of the third optical signal to adjust the position of the focus of the optical signal focused by the reading and writing optical head 43.

[0248] It should be understood that, as described above, the data reading and writing system 40 can generate the power of the initial optical signal for writing the servo point at multiple preset moments by controlling the light source assembly 41 to achieve writing of the servo point arranged in any possible implementation manner described above on the optical storage medium 44. The multiple preset moments correspond one-to-one to the servo points arranged in any possible implementation manner. Therefore, the data reading and writing system 40 can determine whether the third optical signal is a servo optical signal by determining whether the moment when the third optical signal is received is the preset moment corresponding to the servo point. The processor 1422 is preset with the correspondence between the preset moment and the servo point.

[0249] The preset information of the servo point includes the light intensity and light spot information of the servo point. The light intensity and light spot information refer to the light intensity and light spot information of the light signal returned by the servo point detected by the light detector 1421 when the light signal used to read data is accurately focused on the servo point. The returned light signal may be a reflected light signal or a fluorescent signal, which is not limited. The power of the light signal used to read data may be the third preset power mentioned above.

[0250] The light intensity and light spot information in the preset information of the servo point may be obtained by pre-measurement.

[0251] For example, the data reading and writing system 40 may use an optical signal having a third preset power. Fig.14The optical path of the data reading and writing system 40 is accurately focused on any servo point on the optical storage medium 44 (taking the power of writing all servo points as an example). Then, the optical detector 1421 receives the optical signal returned by any servo point and determines the light intensity and light spot information of the optical signal. In this way, the light intensity and light spot information are the preset information of the servo point mentioned above.

[0252] For the convenience of description, the embodiment of the present application refers to the light intensity in the above preset information as the first light intensity, and the light spot information in the above preset information as the first light spot information. In addition, the embodiment of the present application refers to the light intensity of the third light signal received by the processor 1422 as the second light intensity, and the light spot information of the third light signal received by the processor 1422 as the second light spot information.

[0253] In this case, the processor 1422 can determine the servo control signal according to the received second light intensity and second light spot information, and the preset first light intensity and first light spot information. The servo control signal includes at least one of a focusing servo signal and a tracking servo signal.

[0254] On the one hand, the processor 1422 can determine the adjustment direction of the servo control signal when adjusting the focal position of the light signal focused by the read / write optical head 43 based on the spot size and spot shape in the first spot information and the spot size and spot shape in the second spot information.

[0255] As an example, refer to Fig.16 , Fig.16 A schematic diagram is shown of determining the adjustment direction of the servo control signal when adjusting the focal position of the light signal focused by the read / write optical head 43 according to the size and shape of the light spot.

[0256] like Fig.16 As shown in FIG. 1 , the solid circle represents the light spot 161 in the preset information of the servo point. The overlapped part of the solid circle and the dotted circle represents the light spot 162 corresponding to the third light signal. Fig.16 As shown, the processor 1422 can determine that the read / write optical head 43 does not accurately focus the optical signal for acting as the servo point on the optical storage medium 44 according to the shapes and sizes of the light spots 161 and 162. In addition, the processor 1422 can also determine that the focal position of the read / write optical head 43 when focusing the optical signal needs to be adjusted in the axial direction of the read / write optical head 43 toward the direction close to the optical storage medium 44.

[0257] refer to Fig.17 , Fig.17 Another schematic diagram is shown for determining the adjustment direction of the servo control signal when adjusting the focal position of the optical signal focused by the read / write optical head 43 according to the size and shape of the optical spot.

[0258] like Fig.17As shown in FIG. 1 , the solid circle represents the light spot 171 in the servo point preset information. The overlapped portion of the solid circle and the dotted circle represents the light spot 172 corresponding to the third light signal. Fig.17 As shown, the processor 1422 can determine the shape and size of the light spot 171 and the light spot 172 so as to determine the radial direction (i.e. Fig.13 In the x-axis direction and y-axis direction shown in the figure, the focal position of the read / write optical head 43 when focusing the optical signal is adjusted along the positive direction of the x-axis and the positive direction of the y-axis.

[0259] On the other hand, the processor 1422 can determine the focus error and the tracking error of the data reading and writing system 40 based on the first light intensity and the second light intensity.

[0260] Specifically, for any servo point, the processor 1422 may make a difference between the first light intensity and the second light intensity, and determine the focus error and tracking error of the data reading and writing system 40 according to the difference.

[0261] Optionally, the designer may preset the difference between different light intensities and the first light intensity, and the corresponding relationship between the focusing error and the tracking error of the data reading and writing system 40 in the processor 1422 based on a large number of test results.

[0262] In this way, the processor 1422 can determine the focusing error and tracking error of the data reading and writing system 40 according to the corresponding relationship and the difference between the first light intensity and the second light intensity.

[0263] Then, when the focusing error determined by the processor 1422 is greater than the third preset threshold, the processor 1422 can generate a focusing servo signal according to the above-determined adjustment direction and the determined focusing error. The focusing servo signal is used to indicate the adjustment of the position of the read / write optical head 43 in the axial direction of the read / write optical head 43, thereby realizing the focal position when adjusting the focusing light signal of the read / write optical head 43 in the axial direction.

[0264] It should be understood that when the focus error determined by the processor 1422 is less than the third preset threshold, the data reading system 40 can accurately read the data stored in the optical storage medium. In this case, the data reading system 40 may not perform focus servo. That is, the data reading system 40 does not need to adjust the focus position of the read / write optical head 43 in the axial direction when focusing the optical signal.

[0265] The embodiment of the present application does not specifically limit the case where the focus error is equal to the third preset threshold. For example, when the focus error is equal to the third preset threshold, the processor 1422 may generate a focus servo signal or may not generate a focus servo signal, and this is not limited.

[0266] Optionally, the processor 1422 may be preset with a correspondence between different focusing errors and the adjustment amount of adjusting the position of the read / write optical head 43 in the axial direction. The correspondence may be determined in advance based on a large number of experiments and is not specifically limited thereto.

[0267] When the tracking error determined by the processor 1422 is greater than the fourth preset threshold, the processor 1422 can generate a tracking servo signal according to the above-determined adjustment direction and the determined tracking error. The tracking servo signal is used to indicate the adjustment of the position of the reflector 46 in the radial direction, thereby adjusting the focal position of the focus light signal of the read / write optical head 43 in the radial direction.

[0268] It should be understood that when the tracking error determined by the processor 1422 is less than the fourth preset threshold, the data reading system 40 can accurately read the data stored in the optical storage medium 44. In this case, the data reading system 40 may not perform tracking servo. That is, the data reading system 40 does not need to adjust the focal position of the read / write optical head 43 in the radial direction when focusing the optical signal.

[0269] The embodiment of the present application does not specifically limit the case where the radial error is equal to the fourth preset threshold. For example, when the radial error is equal to the fourth preset threshold, the processor 1422 may generate a radial servo signal or may not generate a radial servo signal, and this is not limited.

[0270] Optionally, the processor 1422 may be preset with a correspondence between different tracking errors and the adjustment amount of the position of the reflector 46 in the radial direction. The correspondence may be determined in advance based on a large number of experiments, and is not specifically limited thereto.

[0271] Among them, the embodiment of the present application does not specifically limit the values ​​of the third preset threshold and the fourth preset threshold.

[0272] Then, after the processor 1422 generates a focus servo signal, the focus servo signal can be sent to Fig.14 The second movable platform 143 shown in the figure is used to control the read / write optical head 43 to move in the axial direction according to the instruction of the focusing servo signal, thereby adjusting the focal position of the read / write optical head 43 when focusing the optical signal in the axial direction.

[0273] Next, after the processor 1422 generates a tracking servo signal, the tracking servo signal may be sent to Fig.14 The third movable platform 144 shown in the figure is used to control the reflective mirror 46 to move in the radial direction according to the instruction of the tracking servo signal, thereby adjusting the focal position of the read / write optical head 43 when focusing the optical signal in the radial direction.

[0274] It is understandable that the data reading and writing system 40 usually first performs servo on the focus error of the system. In this way, when the data reading and writing system 40 reads the next data point of the current data point, the optical signal used to read the next data point can be focused on the next data point after being focused by the reading and writing optical head 43, that is, the focus error of the system is eliminated. Then, the data reading and writing system 40 performs servo on the tracking error of the system to eliminate the tracking error of the system.

[0275] It can be seen that the data point servo addressing scheme adopted by the embodiment of the present application when reading data is to perform servo addressing by using a separate data point as a servo point. Compared with the scheme in the prior art that requires extracting a servo optical signal for determining a servo control signal from a data optical signal according to frequency information, the scheme provided by the embodiment of the present application is more convenient and efficient.

[0276] Thus, when reading data, the data reading and writing system provided by the embodiment of the present application can be simply understood as the data reading and writing system sequentially deflects the first optical signal obtained by modulating the initial optical signal generated by the light source assembly through the optical deflector, so as to read a row of data points on the optical storage medium within a preset period. At the same time, the data reading and writing system controls the movement of the optical storage medium, thereby reading multiple rows of data points on the optical storage medium along the moving direction of the optical storage medium within multiple preset periods, thereby reading a data band including multiple data tracks. That is, the data reading and writing system provided by the embodiment of the present application reads data on the moving optical storage medium, and realizes the effect of simultaneously reading multiple data tracks on the optical storage medium by controlling a single beam of optical signal, that is, the effect of reading data in parallel on the optical storage medium by a single beam of optical signal. Thus, the embodiment of the present application improves the efficiency of reading data by the data reading and writing system without increasing the rotation speed of the optical storage medium.

[0277] In addition, the data reading and writing system provided by the embodiment of the present application can efficiently read data while also performing efficient servo addressing, thereby improving the accuracy of data reading.

[0278] It should be pointed out that Fig.14 The data reading and writing system 40 shown in FIG. 4 only shows the core components / modules of the data reading and writing system 40. Fig.14 The structure shown does not constitute a limitation on the data reading and writing system 40. Fig.14In addition to the devices / modules shown, the data reading and writing system 40 may include more or fewer devices or modules than shown, or different device / module arrangements, etc. For example, if the light deflector in the data reading and writing system 40 is a rotating mirror, the data reading and writing system 40 may also include an f-θ mirror. For another example, the data reading and writing system 40 may also include a connecting circuit between the processor 1422 and the first mobile platform 45, a connecting circuit between the processor 1422 and the second mobile platform 143, and a connecting circuit between the processor 1422 and the third mobile platform 144, etc., which will not be described in detail here.

[0279] It should also be understood that the above description of the data reading and writing system 40 is based on the example of the optical deflector 42 deflecting the first optical signal including only a single optical signal. Of course, the optical deflector 42 can also deflect the array optical signal including multiple optical signals to obtain multiple array optical signals, so as to realize the reading and writing of a data block. In this case, the array optical signal is deflected in turn by the optical deflector 42 in each of multiple preset cycles to obtain multiple array optical signals, so as to realize the reading and writing of a data band including multiple data blocks. In this way, the speed of data reading and writing can be further improved.

[0280] The array optical signal may be a one-dimensional or two-dimensional array signal, for example, the array optical signal includes 1*j optical signals, or the array optical signal includes k*j optical signals, which is not limited thereto. Wherein, j and k are both integers greater than 1.

[0281] It should also be understood that when the array column light signal is a one-dimensional array column light signal, when the one-dimensional array column light signal is input into the optical deflector 42, the plane where the one-dimensional array column light signal is located has a preset angle with the plane where the optical deflector 42 deflects the optical signal. That is, the plane where the one-dimensional array column light signal is located is not in the same plane as the plane where the optical deflector 42 deflects the optical signal. In this way, the one-dimensional array column light signal can be deflected into multiple one-dimensional array column light signals by the optical deflector 42 within a preset period, thereby realizing the reading and writing of a data band including multiple data blocks.

[0282] In this case, the data reading and writing system 40 may further include optical devices such as a beam splitter for splitting the optical signal generated by the light source assembly into an array optical signal, which will not be described in detail here.

[0283] refer to Fig.18 , Fig.18 FIG. 1 shows a schematic diagram of a data band including a plurality of data blocks. Fig.18As shown, on a circular optical storage medium, data track 1, data track 2 and data track 3 form a ring-shaped data band. Among them, data block 1 is a data point set on data track 1, data block 2 is a data point set on data track 2, and data block 3 is a data point set on data track 3. Among them, multiple data points in a data point set are written simultaneously on the optical storage medium after an array optical signal is deflected by an optical deflector.

[0284] The data reading and writing method provided in the embodiment of the present application is described below in conjunction with the accompanying drawings.

[0285] refer to Fig.19 , Fig.19 A schematic diagram of a data reading and writing method provided in an embodiment of the present application is shown. The method is applied to Fig.14 In the data reading and writing system 40 shown, the method may include the following steps:

[0286] S101. A data reading and writing system generates a first optical signal.

[0287] For the description of the first optical signal, reference may be made to the above-mentioned related description of the first optical signal, which will not be repeated here.

[0288] Specifically, the process of the data reading and writing system generating the first optical signal can refer to the above description of obtaining the first optical signal based on the initial optical signal generated by the light source assembly 41, which will not be repeated here.

[0289] S102: The data reading and writing system deflects the first optical signal at multiple angles in sequence to obtain multiple second optical signals.

[0290] Specifically, the data reading and writing system may deflect the first optical signal by the multiple angles in sequence within a preset period to obtain multiple second optical signals.

[0291] Among them, the data reading and writing system deflects the first light signal by the multiple angles in sequence within a preset period to obtain multiple second light signals. For the description, please refer to the above description that the light deflector 42 deflects the first light signal by multiple angles in sequence to obtain multiple second light signals, which will not be repeated here.

[0292] S103. The data reading and writing system focuses the above-mentioned multiple second optical signals on the optical storage medium to realize the reading and writing of multiple data points, and the data reading and writing system focuses the multiple second optical signals corresponding to each preset period on the optical storage medium in each preset period of multiple preset periods to realize the reading and writing of multiple data tracks.

[0293] The multiple data tracks include multiple data points read and written by the data reading and writing system within a preset period, and the multiple data tracks correspond to the multiple data points one by one.

[0294] Among them, the data reading and writing system focuses the above-mentioned multiple second optical signals on the optical storage medium to realize the reading and writing of multiple data points, and the data reading and writing system focuses the multiple second optical signals corresponding to each preset period on the optical storage medium in each preset period in multiple preset periods to realize the reading and writing of multiple data tracks. Please refer to the description of the reading and writing optical head 43 focusing the multiple second optical signals on the optical storage medium to realize the reading and writing of multiple data points and data tracks in the above text, which will not be repeated here.

[0295] Furthermore, when the data reading and writing system reads data, after the data reading and writing system controls any one of the plurality of second optical signals to act on the optical storage medium, that is, after any one of the plurality of optical signals acts on the data point on the optical storage medium, the data point on the optical storage medium can return the third optical signal. In this case, the data reading and writing system can generate a servo control signal based on the third optical signal. Alternatively, the data reading and writing system determines the data to be read based on the third optical signal.

[0296] If any one of the data points is a servo point, the third optical signal is a servo optical signal, that is, the data reading and writing system can generate a servo control signal based on the third optical signal.

[0297] If any one of the data points is used to store data, the third optical signal is a data optical signal, that is, the data reading and writing system can determine the data to be read based on the third optical signal.

[0298] Among them, the description of the data reading and writing system generating a servo control signal based on the third optical signal, and the data reading and writing system determining the data to be read based on the third optical signal can refer to the description of the information processing module 142 generating a servo control signal based on the third optical signal, and determining the data to be read based on the third optical signal in the above text, which will not be repeated here.

[0299] S104. After the data reading and writing system completes reading and writing a first data band including multiple data tracks on any storage layer in the optical storage medium, the optical deflector and the read-write optical head in the data reading and writing system are moved a preset distance in a plane perpendicular to the axial direction of the read-write optical head to realize reading and writing of a second data band in any storage layer.

[0300] Among them, after the data reading and writing system completes reading and writing the first data band including multiple data tracks on any storage layer in the optical storage medium, the optical deflector and the read-write optical head in the data reading and writing system are moved a preset distance in a plane perpendicular to the axial direction of the read-write optical head to realize the reading and writing of the second data band in any storage layer. The description of the data reading and writing system moving the optical deflector and the read-write optical head through the radial moving table 91 to realize the reading and writing of different data bands can be referred to the above description, which will not be repeated here.

[0301] In summary, the embodiments of the present application provide a data reading and writing system and method, which sequentially deflects the first optical signal obtained by modulating the initial optical signal generated by the light source component through an optical deflector, so as to read and write a row of data points on the optical storage medium within a preset period. At the same time, the data reading and writing system controls the movement of the optical storage medium, thereby reading and writing multiple rows of data points on the optical storage medium along the moving direction of the optical storage medium within multiple preset periods, thereby reading and writing a data band including multiple data tracks. In other words, the data reading and writing system provided by the present application reads and writes data on a moving optical storage medium, thereby achieving the effect of simultaneously reading and writing multiple data tracks on the optical storage medium by controlling a single beam of optical signal, that is, achieving the effect of reading and writing data in parallel on the optical storage medium by a single beam of optical signal. In this way, the embodiments of the present application improve the efficiency of the data reading and writing system in reading and writing data without increasing the rotation speed of the optical storage medium.

[0302] In addition, the data reading and writing system provided by the embodiment of the present application can perform efficient servo addressing while efficiently reading data, thereby improving the accuracy of reading data.

[0303] In order to more clearly illustrate the beneficial effects brought about by the data reading and writing system provided in the embodiment of the present application, further explanation is given below using a practical application example as an example.

[0304] Taking the case where the initial light signal generated by the light source assembly is a single-beam light signal, the light deflector is an acousto-optic deflector, and the frequency of the deflected light signal is 300KHz, the scanning range of the read / write optical head (the position range of the light signal deflected by the light deflector and focused on the optical storage medium by the read / write optical head) is 300μm, and the diameter of a single bit (i.e., a single data point (one data point represents one bit)) is 200nm as an example, the read / write bandwidth achievable by the data read / write system provided in the embodiment of the present application is: 300KHz×300μm÷200nm / bit=56.25MB / s.

[0305] In this case, taking the optical storage medium as a circular CD, and the CD being rotated by the first movable platform as an example, if the track spacing between two adjacent data tracks on the CD is 400nm (i.e., the distance between the centers of two parallel data points on the two data tracks), then the linear velocity of the first movable platform for rotating the CD is only: v = 300KHz × 400nm = 120mm / s.

[0306] In this case, based on the formula for calculating the speed n: When the linear velocity v is 120 mm / s, if the outer diameter D of the optical disc is 120 mm and the inner diameter D is 40 mm, the outer ring speed of the first moving platform for rotating the optical disc is: If the outer diameter D of the optical disc is 240 mm and the inner diameter D is 40 mm, the rotation speed of the first moving platform for rotating the optical disc is:

[0307] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A data reading and writing system, characterized in that: The system comprises: An optical deflector, used to receive a radio frequency signal, and deflect the first optical signal at multiple angles in sequence according to a frequency change of the received radio frequency signal to obtain multiple second optical signals; A read / write optical head is used to receive the multiple second optical signals and focus the multiple second optical signals in sequence on multiple data points in a storage layer of an optical storage medium to achieve reading and writing of multiple data points at different times; wherein the storage layer includes a first annular data band and a second annular data band separated from the first annular data band, the first annular data band includes multiple data tracks, and each of the multiple data points is located in a corresponding data track of the multiple data tracks.

2. The system according to claim 1, characterized in that The system further comprises: A moving platform, used for placing the optical storage medium and for controlling the optical storage medium to rotate on a plane perpendicular to the axial direction of the read / write optical head; The optical deflector is specifically used to deflect the first optical signal by the multiple angles in sequence in each preset period of a plurality of preset periods to obtain the plurality of second optical signals; The read / write optical head is also used to receive the multiple second optical signals within each preset period, and focus the multiple second optical signals on the optical storage medium respectively to realize reading and writing of multiple data tracks in the first annular data band; wherein the multiple data tracks correspond to the multiple data points one by one.

3. The system according to claim 1 or 2, characterized in that: The optical deflector includes at least one of the following devices: a polygonal mirror, a galvanometer, an acousto-optic deflector or an electro-optic deflector.

4. The system according to claim 2, characterized in that The multiple data tracks include at least one servo track, and the multiple servo points on the servo track are discretely distributed; wherein the servo points are used to adjust the focal position of the read / write optical head when focusing the optical signal when reading data.

5. The system according to claim 4, characterized in that The distance between any two adjacent servo points among the plurality of servo points is greater than or equal to a preset distance.

6. The system according to any one of claims 1, 2, 4 and 5, characterized in that: The optical storage medium comprises a plurality of storage layers, wherein the servo points in the plurality of storage layers are discretely distributed in the axial direction of the read / write optical head; wherein the servo points are used to adjust the focal position of the read / write optical head when focusing the optical signal when reading data.

7. The system according to any one of claims 2, 4 and 5, characterized in that: The system further comprises: A radial moving stage is used to move the optical deflector and the read / write optical head by a preset distance in a plane perpendicular to the axial direction of the read / write optical head after completing reading and writing the first annular data band on the first storage layer among the multiple storage layers of the optical storage medium, so as to realize reading and writing of the second annular data band in the first storage layer, wherein the first storage layer includes multiple annular data bands.

8. The system according to any one of claims 1, 2, 4 and 5, characterized in that: The system also includes a signal processing module: for receiving a third optical signal when reading data; the third optical signal is an optical signal returned by the optical storage medium after any one of the plurality of second optical signals acts on any data point on the optical storage medium; and for generating a servo control signal based on the third optical signal when the third optical signal is a servo optical signal, the servo control signal being used to adjust a focal position of the read / write optical head when focusing the optical signal; and for determining data to be read based on the third optical signal when the third optical signal is a data optical signal; If any one of the data points is a servo point, the third optical signal is a servo optical signal; if any one of the data points is used to store data, the third optical signal is a data optical signal.

9. The system according to any one of claims 1, 2, 4 and 5, characterized in that: The system further comprises: A light source assembly is used to obtain the first optical signal.

10. A data reading and writing method, characterized in that: Applied to a data reading and writing system, the method comprises: receiving radio frequency signals; Deflecting the first optical signal in sequence at multiple angles according to the frequency change of the received radio frequency signal to obtain multiple second optical signals; The multiple second optical signals are respectively focused in sequence on multiple data points in a storage layer of an optical storage medium to achieve reading and writing of the multiple data points at different times; wherein the storage layer includes a first annular data band and a second annular data band separated from the first annular data band, the first annular data band includes multiple data tracks, and each of the multiple data points is located in a corresponding data track of the multiple data tracks.

11. The method according to claim 10, characterized in that The method further comprises: Controlling the optical storage medium to rotate on a plane perpendicular to the axial direction of the read / write optical head in the data read / write system; The step of sequentially deflecting the first optical signal at multiple angles to obtain multiple second optical signals includes: In each preset period of a plurality of preset periods, sequentially deflecting the first optical signal by the plurality of angles to obtain the plurality of second optical signals; The method further comprises: In each preset period, the plurality of second optical signals are focused on the optical storage medium to realize reading and writing of the plurality of data tracks in the first annular data band; wherein the plurality of data tracks correspond to the plurality of data points one by one.

12. The method according to claim 10 or 11, characterized in that: The step of sequentially deflecting the first optical signal at multiple angles to obtain multiple second optical signals includes: The optical deflector in the data reading and writing system deflects the first optical signal at multiple angles in sequence to obtain multiple second optical signals; wherein the optical deflector includes at least one of the following devices: a polygonal mirror, a galvanometer, an acousto-optic deflector or an electro-optical deflector.

13. The method according to claim 11, characterized in that The multiple data tracks include at least one servo track, and the multiple servo points on the servo track are discretely distributed; wherein the servo points are used to adjust the focal position of the read / write optical head when focusing the optical signal when reading data.

14. The method according to claim 13, characterized in that The distance between any two adjacent servo points among the plurality of servo points is greater than or equal to a preset distance.

15. The method according to any one of claims 10, 11, 13 and 14, characterized in that: The optical storage medium includes multiple storage layers, and the servo points in the multiple storage layers are discretely distributed in the axial direction of the read-write optical head in the data read-write system; wherein the servo points are used to adjust the focal position of the read-write optical head when focusing the optical signal when reading data.

16. The method according to any one of claims 11, 13 and 14, characterized in that: The method further comprises: After performing read and write operations on the first annular data band on the first storage layer among the multiple storage layers of the optical storage medium, the optical deflector and the read-write optical head in the data read-write system are moved a preset distance in a plane perpendicular to the axial direction of the read-write optical head to realize reading and writing of the second annular data band in the first storage layer, wherein the first storage layer includes multiple annular data bands.

17. The method according to any one of claims 10, 11, 13 and 14, characterized in that: The method further comprises: When the third optical signal is a servo optical signal, generating a servo control signal based on the third optical signal, the servo control signal being used to adjust a focal position of a read / write optical head in the data read / write system when focusing the optical signal; and when the third optical signal is a data optical signal, determining data to be read based on the third optical signal; The third optical signal is an optical signal returned by the optical storage medium after any one of the plurality of second optical signals acts on any data point on the optical storage medium; If any one of the data points is a servo point, the third optical signal is a servo optical signal; if any one of the data points is used to store data, the third optical signal is a data optical signal.

18. The method according to any one of claims 10, 11, 13 and 14, characterized in that: Before sequentially deflecting the first optical signal at multiple angles to obtain multiple second optical signals, the method further includes: The first optical signal is generated.

19. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes computer instructions. When the computer instructions are executed on the data read-write control device, the data read-write control device is enabled to execute the method according to any one of claims 10 to 18.

20. A computer program product, characterized in that When the computer program product runs on a data read and write control device, the data read and write control device is enabled to execute the method according to any one of claims 10 to 18.

Images