Data reading / writing system and method

Abstract

This application relates to the field of optical storage technology and discloses a system and method for reading and writing data. The method can be used to increase the read / write 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 configured to sequentially deflect a first optical signal through multiple angles to obtain multiple second optical signals. The read / write optical head is configured to receive the multiple second optical signals and separately focus the multiple second optical signals onto the optical storage medium to read and write multiple data points.

Description

[Technical field]

[0001] The present application relates to the field of optical storage technology, and in particular to systems and methods for reading / writing data. [Background technology]

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

[0003] In conventional optical storage technology, the read / write optical head used for the output optical signal is usually fixed, and the optical storage medium (e.g., optical disk) is rotated at high speed using a high-speed rotating motor to realize reading / writing data to the optical storage medium via the optical signal. In order to improve the data read / write speed, the rotation speed of the optical storage medium has been conventionally increased. However, increasing the rotation speed of the optical storage medium increases the jitter noise of the optical storage medium, making it more difficult to control the optical path servo.

[0004] In view of this, how to improve the read / write speed of optical storage without increasing the rotation speed of the optical storage medium is an urgent technical problem. Summary of the Invention

[0005] The present application provides a data read / write system and method for increasing the read / write speed of optical storage without increasing the rotation speed of the optical storage medium.

[0006] To achieve this goal, the present application provides the following technical solutions:

[0007] According to a first aspect, the present application provides a data reading / writing system, the system comprising: an optical deflector configured to sequentially deflect a first optical signal through a plurality of angles to obtain a plurality of second optical signals; a read / write optical head configured to receive the second optical signals and separately focus the second optical signals onto an optical storage medium to read / write a plurality of data points; Includes.

[0008] According to the data read / write system provided herein, the optical deflector can sequentially deflect the first optical signal used for reading / writing data to read / write rows of data points on the optical storage medium. The data read / write system provided herein reads / writes data on a moving optical storage medium, and simultaneously reads / writes multiple data channels in a data band on the optical storage medium by controlling a single optical signal without increasing the rotation speed of the optical storage medium, and reads / writes data in parallel through the single optical signal, which improves the data read / write efficiency of the data read / write system.

[0009] In a possible design, the system comprises: a moving platform configured to receive the optical storage medium and configured to control the optical storage medium to rotate or translate in a plane perpendicular to an axial direction of the read / write optical head; the optical deflector is specifically configured to sequentially deflect the first optical signal by the plurality of angles in each of a plurality of preset periods to obtain the plurality of second optical signals; The read / write optical head is further configured to receive the second optical signals at preset time intervals and focus the second optical signals separately onto the optical storage medium to read / write a plurality of data channels, the plurality of data channels including the plurality of data points, the plurality of data channels having a one-to-one correspondence with the plurality of data points.

[0010] In a possible design, the data read / write system provided herein reads / writes data on a moving optical storage medium, and performs simultaneous reading / writing of the multiple data channels in the data band on the optical storage medium by controlling the single optical signal without increasing the rotation speed of the optical storage medium, and performs data reading / writing in parallel through the single optical signal, which improves the data reading / writing efficiency of the data read / write system.

[0011] In another design, the optical deflector includes at least one of the following devices: a multi-faceted rotating mirror, an oscillating mirror, an acousto-optical deflector, or an electro-optical deflector.

[0012] With this possible design, the data read / write system provided herein can meet different design requirements.

[0013] In another design, the multiple data channels include at least one servo channel, with multiple servo points discretely distributed on the servo channel, and the servo points are used to adjust the position of a focal point of an optical signal focused by the read / write optical head when the data read / write system reads data.

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

[0015] Two possible designs allow the data read / write system to perform a servo when reading the data, which improves the accuracy with which the data read / write system reads the data.

[0016] In another possible design, the optical storage medium includes multiple storage layers, the servo points of the multiple storage layers being discretely distributed in the axial direction of the read / write optical head, and the servo points are used to adjust the position of a focal point of an optical signal focused by the read / write optical head while the data reading / writing system is reading data.

[0017] In this possible design, when the optical storage medium includes the multiple storage layers and the data read / write system reads servo points of a storage layer far away from the read / write optical head, the attenuation of the optical signal used to read the servo points can be reduced, so that the servo points can be accurately provided to the data read / write system, thereby improving the accuracy when the data read / write system reads data.

[0018] In another possible design, the multiple data channels form a data band, and the system further comprises: a radial movement station configured to move the optical deflector and the read / write optical head of the data read / write system a preset distance in a plane perpendicular to an axial direction of the read / write optical head to read / write a second data band in the first storage layer after reading / writing of a first data band in a first storage layer of the plurality of storage layers of the optical storage medium is completed, the first storage layer including a plurality of data bands.

[0019] This possible design allows reading / writing of the entire optical storage medium.

[0020] In another possible design, the system further comprises a signal processing module; The signal processing module includes: the data read / write system is configured to receive a third optical signal when reading the data; configured to generate 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 position of a focus of an optical signal focused by the read / write optical head in the data reading / writing system; or configured to determine data to be read based on the third optical signal if the third optical signal is a data optical signal, the third optical signal being an optical signal returned by the optical storage medium after any of the plurality of second optical signals has acted on any data point on the optical storage medium; If the given data point is a servo point, then the third optical signal is the servo optical signal, or if the given data point is used to store data, then the third optical signal is the data optical signal.

[0021] In another possible design, the system further includes a light source component configured to obtain the first light signal.

[0022] According to a second aspect, the present application provides a method for reading / writing data applied to a data reading / writing system, the method comprising: sequentially deflecting the first optical signal through a plurality of angles to obtain a plurality of second optical signals; focusing the second optical signals onto an optical storage medium to read / write a plurality of data points; Includes.

[0023] In a possible design, the method comprises: controlling the optical storage medium to rotate or translate in a plane perpendicular to an axial direction of the read / write optical head of the read / write system; Specifically, the step of "sequentially deflecting the first optical signal at a plurality of angles to obtain a plurality of second optical signals" includes the steps of: sequentially deflecting the first optical signal through the plurality of angles during each of a plurality of preset periods to obtain the plurality of second optical signals; The method comprises: Focusing the plurality of second optical signals onto the optical storage medium at preset time intervals to enable reading and writing of a plurality of data channels, the plurality of data channels including the plurality of data points, the plurality of data channels having a one-to-one correspondence with the plurality of data points.

[0024] In another possible design, the step of "sequentially deflecting the first optical signal at a plurality of angles to obtain a plurality of second optical signals" specifically includes: The method includes a step of sequentially deflecting the first optical signal at the plurality of angles to obtain the plurality of second optical signals by an optical deflector of the data read / write system, the optical deflector including at least one of the following devices: a multi-faceted rotating mirror, an oscillating mirror, an acousto-optical deflector, or an electro-optical deflector.

[0025] In another design, the multiple data channels include at least one servo channel, with multiple servo points discretely distributed on the servo channel, and the servo points are used to adjust the position of a focal point of an optical signal focused by 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 of the plurality of servo points is greater than or equal to a preset distance.

[0027] In another possible design, the optical storage medium includes multiple storage layers, and servo points of the multiple storage layers are discretely distributed in the axial direction of the read / write optical head of the data read / write system, and the servo points are used to adjust the position of a focal point of an optical signal focused by the read / write optical head when the data read / write system reads data.

[0028] In another possible design, the plurality of data channels form a data band, and the method further comprises: after completing a read / write operation on a first data band in a first storage layer of the plurality of storage layers of the optical storage medium, moving the optical deflector and the read / write optical head of the data read / write system a preset distance in a plane perpendicular to an axial direction of the read / write optical head to read / write a second data band in the first storage layer, the first storage layer including a plurality of data bands.

[0029] In another possible design, the method further comprises: generating a servo control signal based on the third optical signal if the third optical signal is a servo optical signal, the servo control signal being used to adjust a position of a focus of an optical signal focused by the read / write optical head in the data read-write system, or determining data to be read based on the third optical signal if the third optical signal is a data optical signal; the third optical signal being an optical signal returned by the optical storage medium after any of the plurality of second optical signals has acted on any data point on the optical storage medium; If any data point is a servo point, then the third optical signal is the servo optical signal, or if any data point is configured to store data, then the third optical signal is the data optical signal.

[0030] In another possible design, before "sequentially deflecting the first optical signal through a plurality of angles to obtain a plurality of second optical signals," the method further comprises: The method further includes the step of generating the first optical signal.

[0031] For the description and beneficial effects of the data read / write method provided in the second aspect, please refer to the description and beneficial effects of the data read / write system provided in the first aspect and any of the possible designs of the first aspect, and the details will not be described again here.

[0032] According to a third aspect, the present application provides a data read / write control device. The data read / write control device includes a processor and a memory. The processor calls a computer program stored in the memory from the memory, executes the computer program, and The above Data Read / Write Control Equipment to perform the method of reading / writing data according to the second aspect and any of the possible designs of the second aspect.

[0033] According to a fourth aspect, the present application provides a computer program product, the computer program product, when executed on a data read / write control device, The above Data Read / Write Control Equipment is controlled to perform the data reading / writing method of any of the second aspect and possible designs of the second aspect.

[0034] According to a fifth aspect, the present application provides a computer readable storage medium, for example a non-transitory computer readable storage medium, the computer readable storage medium storing a computer program (instructions), the computer program (or instructions) executing on a data read / write control device controls a data read / write system to perform the data read / write method provided in the second aspect.

[0035] It can be understood that the data read / write control device, computer program product, computer storage medium, etc. provided above can be applied to the corresponding methods provided above. Therefore, for the advantageous effects that can be achieved, please refer to the advantageous effects in the corresponding methods. Details will not be described again here.

[0036] In this application, the names of the data read / write system and the data read / write control device do not constitute limitations on the devices and function modules. In actual implementation, the devices or function modules may be displayed with different names. If the functions of the devices or function modules are similar to those of this application, they are 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 concise and understandable in the following description. [Brief description of the drawings]

[0038] [Figure 1] FIG. 1 is a schematic diagram of deflection of an optical signal by an acousto-optic deflector in the prior art;

[0039] [Diagram 2] FIG. 2 is a schematic diagram of focusing errors in a data reading system according to an embodiment of the present application;

[0040] [Diagram 3] FIG. 2 is a schematic diagram of a tracking error in a data reading system according to an embodiment of the present application;

[0041] [Figure 4] FIG. 1 is a schematic diagram of the structure of a data read / write system according to an embodiment of the present application;

[0042] [Diagram 5] 1 is a schematic diagram of a structure of a light source component according to an embodiment of the present application.

[0043] [Figure 6] FIG. 2 is a schematic diagram of the structure of a data reading / writing system according to an embodiment of the present application;

[0044] [Figure 7] FIG. 2 is a schematic diagram of three optical pulse signals in a first optical signal received during a preset period being sequentially deflected at different angles by an optical deflector according to an embodiment of the present application;

[0045] [Figure 8] FIG. 2 is a schematic diagram of a read / write optical head writing data points to an optical storage medium according to an embodiment of the present application.

[0046] [Figure 9] FIG. 3 is a schematic diagram of the structure of a data reading / writing system according to an embodiment of the present application.

[0047] [Figure 10] FIG. 13 is a schematic diagram of a data read / write system writing different data bands by controlling a radial movement station to move a preset distance according to an embodiment of the present application.

[0048] [Figure 11] 2 is a schematic diagram of servo points discretely distributed on axially overlapping circular servo channels according to an embodiment of the present application; FIG.

[0049] [Figure 12] 4A-4C are schematic diagrams of axially non-overlapping servo channels within axially overlapping data bands in each of multiple storage layers according to an embodiment of the present application.

[0050] [Figure 13] 2 is a schematic diagram of servo points distributed on axially overlapping circular servo channels according to an embodiment of the present application; FIG.

[0051] [Figure 14] FIG. 4 is a schematic diagram of the structure of a data reading / writing system according to an embodiment of the present application.

[0052] [Figure 15] FIG. 13 is a schematic diagram of using a third moving platform to move a reflector to radially adjust the position of the focal point of an optical signal focused by a read / write optical head according to an embodiment of the present application.

[0053] [Figure 16] 1 is a schematic diagram of an adjustment direction determined based on the spot size and shape when a servo control signal is used to adjust the position of the focal point of an optical signal focused by a read / write optical head according to an embodiment of the present application.

[0054] [Figure 17] 10 is a schematic diagram of another adjustment direction determined based on the spot size and shape when using a servo control signal to adjust the position of the focal point of an optical signal focused by a read / write optical head in accordance with an embodiment of the present application.

[0055] [Figure 18] FIG. 2 is a schematic diagram of a data band including multiple data blocks according to an embodiment of the present application.

[0056] [Figure 19] 2 is a schematic flowchart of a data read / write method according to an embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0057] In order to better understand the embodiments of the present application, the following describes some terms or techniques used in the examples of the present application.

[0058] 1.Optical deflector

[0059] An optical deflector is a device that uses optical deflection technology to deflect the propagation direction of an optical signal. Optical deflectors are widely used in various devices, such as laser scanning precision photometry devices, laser processing machines, and laser pattern generators. Common optical deflection technologies include mechanical deflection technology and non-mechanical deflection technology.

[0060] Mechanical deflection techniques typically use optical elements such as rotating polygonal mirrors or oscillating mirrors to deflect the propagation direction of an optical signal, whereas non-mechanical deflection techniques use the acousto-optic or electro-optic effect to change the refractive index of a transparent medium to deflect the propagation direction of an optical signal.

[0061] The operating principle of an optical deflector is briefly explained using an example of an acousto-optic deflector that deflects the propagation direction of an optical signal by the acousto-optic effect. When an acoustic wave propagates through a transparent medium (e.g., a crystal), the refractive index of the transparent medium changes, forming a phase type diffraction grating on the transparent medium. When an optical signal passes through the diffraction grating, the propagation direction of the optical signal is deflected.

[0062] An acousto-optic deflector can deflect an optical signal over an angular range proportional to the change in frequency of the acoustic wave propagating in the transparent medium. Specifically, the angular range Δθ of an optical signal deflected by an acousto-optic deflector can be calculated using the following equation (1):

number

[0063] where λ is the wavelength of the deflected optical signal, f1 is the start frequency of the acoustic wave propagating in the transparent medium, f2 is the end frequency of the acoustic wave propagating in the transparent medium, and ν is the propagation speed of the acoustic wave in the transparent medium.

[0064] The acoustic waves used in the acousto-optic deflector to change the refractive index of the transparent medium are usually obtained by performing electroacoustic conversion on the radio frequency (RF) signal received by the acousto-optic deflector. This controls the frequency of the RF signal input to the acousto-optic deflector to obtain acoustic signals of different frequencies. In addition, when acoustic signals of different frequencies propagate through the transparent medium, a phase type diffraction grating is formed on the transparent medium, and the propagation direction of the optical signal passing through the phase type diffraction grating is deflected to different angles.

[0065] In practice, the RF signal input to an acousto-optic deflector is usually an RF signal whose frequency changes continuously. acoustic The frequency of the acoustic signal resulting from the conversion is also continuously varied, which allows the optical signal to be continuously deflected as it passes through a transparent medium acted upon by acoustic waves of continuously varying frequencies.

[0066] In addition, in the acousto-optic deflector, when the frequency of the sound wave propagating in the transparent medium changes from f1 to f2 or from f2 to f1, the optical signal may be deflected by the acousto-optic deflector by an angle range of Δθ. In the embodiment of the present application, the time required to change the frequency of the sound wave propagating in the transparent medium from f1 to f2 (or from f2 to f1) is called a preset period. It may also be understood that the acousto-optic deflector can deflect the optical signal by an angle range Δθ during the preset period.

[0067] It should be understood that in one preset period, the frequency of the sound wave changes in one direction, i.e., from small to large or from large to small. Thus, in the preset period, the acousto-optic deflector deflects the optical signal in one direction.

[0068] For example, Fig. 1 is a schematic diagram of the deflection of an optical signal by an acousto-optic deflector. As shown in Fig. 1, an acousto-optic deflector 11 receives an RF signal whose frequency changes continuously, and converts the RF signal into an acoustic wave whose frequency changes continuously (e.g., the frequency changes from f1 to f2). In this way, when the acoustic wave whose frequency changes continuously propagates through a transparent medium in the acousto-optic deflector 11, the incoming optical signal 12 received by the acousto-optic deflector 11 can be deflected continuously by an angle range Δθ (or during the aforementioned preset period). Thus, an outgoing optical signal 1, an optical signal 2, ..., an optical signal n are obtained in sequence.

[0069] In this case, the incident optical signal 12 becomes a continuous optical signal. For example, the optical signal 12 is deflected at time 1 to obtain optical signal 1, the optical signal 12 is deflected at time 2 to obtain optical signal 2, and the optical signal 12 is deflected at time n to obtain optical signal n, where time 1, time 2, ..., time n are consecutive within a preset period. It can be seen that the acousto-optic deflector 11 sequentially deflects the optical signal 12 in the direction 1 shown in Figure 1 to obtain optical signals with different exit angles. Here, the exit angle is the included angle between the exit optical signal and the incident optical signal.

[0070] Of course, the incident optical signal 12 may alternatively be a pulse-type optical signal. In this case, when the acousto-optic deflector receives n optical pulse signals (n is an integer greater than 1) with a preset period T, the n optical pulse signals can be deflected sequentially in the direction 1 shown in FIG. 1 with the preset period T by the acousto-optic deflector 11 to obtain n optical signals with different output angles. The maximum included angle between the n optical signals with different output angles is equal to or smaller than Δθ.

[0071] It can be seen that the optical deflector, which deflects the optical signal by the acousto-optic effect, controls the deflection of the propagation direction of the optical signal based on the frequency change of the RF signal, and is not limited to mechanical rotating elements. Therefore, the optical deflector has the characteristics of high deflection speed, no inertia, and small mechanical loss.

[0072] 2. Focusing Error

[0073] The focusing error is sometimes called an axis error, and sometimes called a defocus amount.

[0074] When a data reading system uses an optical signal to read data stored on an optical storage medium, a read / write optical head typically needs to focus the optical signal on a storage layer 1 in the optical storage medium used to store the data, thereby reading the data stored on the storage layer 1. In this case, in the optical axis direction of the optical signal, the distance between the focal point of the optical signal focused by the read / write optical head and the storage layer 1 storing the data is zero.

[0075] When the distance between the focal point of the optical signal focused by the read / write optical head and the storage layer 1 storing data is not zero, that is, when there is a certain distance in the optical axis direction of the optical signal between the focal point of the optical signal focused by the read / write optical head and the storage layer 1, the optical signal will not be focused on the storage layer 1 storing data. Therefore, the distance between the focal point of the optical signal focused by the read / write optical head and the storage layer 1 can be said to be the focusing error of the data reading system.

[0076] Fig. 2 is a schematic diagram of the focusing error in a data reading system. As shown in Fig. 2, a storage layer 20 for storing data in an optical storage medium includes a data point A for recording data. The focal point of an optical signal 21 used for reading data and focused by a read / write optical head is a focal point B, and the optical axis of the optical signal 21 is an optical axis 211. It can be seen that in the direction of the optical axis 211, the distance between the focal point B and the data point A is Δz. That is, the focusing error in the data reading system shown in Fig. 2 is Δz.

[0077] 3. Tracking Error

[0078] The tracking error may also be called a radial error.

[0079] When a data reading system uses an optical signal to read data stored on an optical storage medium, and the focusing error is equal to or less than zero or a preset threshold, the data stored on the optical storage medium can be read only if the data point used to record the data on the optical storage medium overlaps with the focal point of the optical signal used to read the data and is focused radially by the read / write optical head. 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 is not limited in the embodiments of the present application.

[0080] If the focal point of the optical signal used to read data and focused by the optical head does not overlap with the radial data points in the optical storage medium, i.e. if there is a certain offset between the focal point of the optical signal focused by the read / write optical head and the radial data points in the optical storage medium, this offset may be referred to as a tracking error of the data reading system.

[0081] It should be understood that on a radial two-dimensional plane, the radial offset may include an x-axis offset and a y-axis offset.

[0082] FIG. 3 is a schematic diagram of tracking error in a data reading system. As shown in FIG. 3, the two-dimensional plane formed by the x-axis and y-axis is a plane perpendicular to the optical axis of the optical signal used to read data. The focal point of the optical signal focused by the read / write optical head is focal point 31. The optical storage medium includes data points 32 used to record data. It can be seen that the radial offset between focal point 31 and data point 32 includes an x-axis offset Δx and a y-axis offset Δy. Δx represents the distance between focal point 31 and data point 32 in the x-axis direction, and Δy represents the distance between focal point 31 and data point 32 in the y-axis direction.

[0083] (4) Other terms

[0084] In the embodiments of the present application, the words "example" or "for example" are used to indicate an example, illustration, or explanation. Any embodiment or design manner described in the embodiments of the present application as an "example" or "for example" should not be described as being preferred or having more advantages over another embodiment or design manner. Rather, the use of the words "example", "for example", etc. is intended to present the relevant concept in a particular way.

[0085] The terms "first" and "second" in the embodiments of this application are intended for descriptive purposes only and should not be understood as an indication or suggestion of the relative importance or implied suggestion of the quantity of the technical features depicted. Thus, a feature qualified by "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, unless otherwise specified, "plurality" means two or more than two.

[0086] As used herein, the term "at least one" means one or more, and as used herein, the term "plurality" means two or more. For example, a plurality of second packets means two or more second packets. The terms "system" and "network" may be used interchangeably herein.

[0087] It should be understood that the terms used in the description of the various examples herein are intended merely to describe particular examples and are not intended to constitute limitations. The singular terms "a" and "an" and "the" used in the description of the various examples and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise.

[0088] It should be further understood that the term "and / or" as used herein indicates and includes any or all possible combinations of one or more of the associated listed items. The term "and / or" describes an association relationship between associated objects and represents that three relationships may exist. For example, A and / or B may represent the following three cases: only A is present, both A and B are present, and only B is present. Furthermore, the character " / " in this application generally indicates an "or" relationship between associated objects.

[0089] It should be further understood that the sequence numbers of the processes do not refer to the execution order in the embodiments of the present application. The execution order of the processes should be determined based on the functions and internal logic of the processes, and should not be considered as a limitation on the implementation process of the embodiments of the present invention.

[0090] It should be understood that determining B based on A does not mean that B is determined based only on A. B may alternatively be determined based on A and / or other information.

[0091] Furthermore, it should be understood that the term "including" (or alternatively expressed as "includes," "including," "comprises," and / or "comprising"), as used herein, specifies the presence of stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0092] Further, it should be understood that the term "if" can be interpreted as meaning "when" or "upon," "in response to determining," or "in response to detecting." Similarly, depending on the context, the phrases "upon determining that" or "if (a described condition or event) is detected" can be interpreted as meaning "upon determining that," "in response to determining," "when (a described condition or event) is detected," or "in response to detecting (a described condition or event)."

[0093] It should be understood that references throughout the specification to "one embodiment" or "an embodiment" should be understood to mean that the embodiment or a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of "in one embodiment," "in an embodiment," or "in a possible embodiment" throughout the specification do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0094] An embodiment of the present application provides a data read / write system that can simultaneously read / write multiple data channels by deflecting an optical signal and moving an optical storage medium, thereby improving the data read / write speed without increasing the moving speed of the optical storage medium.

[0095] In the following, the data read / write system will be described using an example in which the data read / write system is configured to write data.

[0096] 4 is a schematic diagram of a structure of a data reading / writing system 40 according to an embodiment of the present application. As shown in FIG. 4, the data reading / writing system 40 includes a light source component 41, an optical deflector 42, and a reading / writing optical head 43.

[0097] The light source component 41 is configured to generate an initial optical signal, which is a pulsed optical signal that may be, for example, a high frequency pulsed laser signal.

[0098] The optical pulse signal in the initial optical signal is an optical pulse signal having a first preset power. Thus, after passing through the optical deflector 42 and the read / write optical head 43, the optical pulse signal in the initial optical signal acts on the optical storage medium 44 to generate physical and / or chemical properties corresponding to the data to be written, thereby writing 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 exhibited by the optical storage medium 44. Here, the specific value of the first preset power is not limited in the embodiments of the present application.

[0099] The data to be written may be encoded data obtained after encoding the data to be stored. For example, the data to be written may be binary data obtained after encoding the data to be stored, or the data to be written may be decimal data obtained after encoding the data to be stored. This is not limited thereto.

[0100] It should be noted that if the data to be written is binary data, the optical storage medium 44 needs to exhibit two physical and / or chemical properties after being acted upon by the optical signal, thus the first preset power includes two different preset powers, and the two different preset powers correspond one-to-one to the two physical and / or chemical properties.

[0101] For example, if the data to be written is Binary DataIn this case, the physical and / or chemical properties of the optical storage medium 44 must exhibit two states. Thus, state 1 of the optical storage medium 44 may represent a "0" and state 2 of the optical storage medium 44 may represent a "1". Or, state 1 of the optical storage medium 44 may represent a "1" and state 2 of the optical storage medium 44 may represent a "0". In this case, the optical signal with the first preset power includes optical signals with two preset powers. An optical signal with preset power 1 is used to generate state 1 on the optical storage medium 44 to perform the writing of a "0" and an optical signal with preset power 2 is used to write state 2 on the optical storage medium 44. 2 and write "1".

[0102] Similarly, if the data to be written is decimal data, the optical storage medium 44 needs to exhibit 10 physical and / or chemical properties after the optical signal acts on it. Thus, the first preset power includes 10 different preset powers, and the 10 different preset powers correspond one-to-one to the 10 physical and / or chemical properties. The details will not be described again here.

[0103] When the optical storage medium 44 records data using a reflective light method, the optical storage medium 44 may have different reflectivities due to different physical and / or chemical properties produced by the optical storage medium 44. When the optical storage medium 44 records data using an autofluorescence method, the optical storage medium 44 may have different fluorescence radiances due to different physical and / or chemical properties produced by the optical storage medium 44.

[0104] 5 is a schematic diagram of the structure of the light source component 41. As shown in FIG. 5, the light source component 41 includes a light source 411. Optionally, the light source component 41 can further include a shaper 412 and an optical power adjustment module 413.

[0105] The light source 411 is configured to generate an original optical signal, which may be a pulsed optical signal, for example a high frequency pulsed laser signal.

[0106] Optionally, light source 411 may be, for example but is not limited to, a diode laser generator.

[0107] The power of each optical pulse signal in the original optical signal generated by the light source 411 is obtained in advance by the light source 411. Here, when the optical pulse signals in the original optical signal are used to write data to be written, the power of the optical pulse signals obtained in advance by the light source 411 is a first preset power that is determined in advance based on the data to be written. When the optical pulse signals in the original optical signal are used to write servo points, the power of the optical pulse signals obtained in advance by the light source 411 is a second preset power. Here, the specific value of the second preset power is not limited in the embodiments of the present application.

[0108] The servo points are used to adjust the position of the focus of the optical signal focused by the read / write optical head 43 during data reading. The second preset power of the optical pulse signal used to write each servo point may be the same or different. This is not limited.

[0109] It should be understood that if the second preset power of the optical pulse signal used to write each servo point is the same, the area used to represent each servo point on the optical storage medium 44 will have the same physical and / or chemical properties after the data read / write system 40 writes the servo points on the optical storage medium 44. If the second preset power of the optical pulse signal used to write each servo point is different, the area used to represent each servo point on the optical storage medium 44 will have different physical and / or chemical properties after the data read / write system 40 writes the servo points on the optical storage medium 44. For the sake of simplicity, the present embodiment of the present application will be described using an example in which the second preset power of the optical pulse signal used to write each servo point is the same.

[0110] It should be noted that the second preset power of the light pulse signal used to write the servo points is different from the first preset power of the light pulse signal used to write the data to be written.

[0111] Optionally, the original optical signal is the initial optical signal.

[0112] Shaper 412 is configured to adjust the shape of the original optical signal generated by light source 411 .

[0113] For example, shaper 412 may be a beam expander configured to expand the beam of the original optical signal generated by light source 411 .

[0114] In another example, the shaper 412 may be a collimator configured to collimate the beam of the original optical signal generated by the light source 411 .

[0115] Optionally, if loss in the optical path is not taken into consideration, the optical signal output after the original optical signal is shaped by the shaper 412 becomes the initial optical signal.

[0116] The optical power adjustment module 413 is configured 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 requirement, and if 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 requirement, 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 requirement.

[0117] 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 requirement refers to whether the difference between the power of the optical pulse signal previously obtained 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 equal to or less than a first preset threshold. If this difference is equal to or less than the first preset threshold, it indicates that the actual output power of the optical pulse signal output by the light source 411 meets the rated requirement. If this difference is greater than the first preset threshold, it indicates that the actual output power of the optical pulse signal output by the light source 411 does not meet the rated requirement. The specific value of the first preset threshold is not limited in the embodiment of the present application.

[0118] Here, when the difference is equal to the first preset threshold, it is not limited in the embodiment of the present application. For example, in the embodiment of the present application, when the difference is equal to the first preset threshold, it can be determined that the actual output power of each optical pulse signal in the original optical signal generated by the light source 411 meets the rated requirement. Of course, in the embodiment of the present application, as an alternative, when the difference is equal to the first preset threshold, it can be determined 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 requirement.

[0119] Specifically, the optical power adjustment module 413 may include a beam splitter 4131 , a photodetector 4132 , and a processor 4133 .

[0120] The beam splitter 4131 may be configured to split the original optical signal received from the light source 411 into two optical signal beams (e.g., a first original optical signal and a second original optical signal). P 412 may be configured to split the optical signal received from the first original optical signal and the second original optical signal.

[0121] Here, for example, the beam splitter 4131 may be a semi-transmissive semi-inverting light splitting prism or a light splitting lens, or the beam splitter 4131 may be a light splitting prism or a light splitting lens with a preset splitting ratio. This is not limited.

[0122] The splitting ratio may be the ratio of the transmitted optical signal to the reflected optical signal by the beam splitter 4131. For example, the beam splitter 4131 is a beam splitter with a splitting ratio of 95:5. The beam splitter 4131 can transmit 95% of the incident optical signal and reflect 5% of the incident optical signal.

[0123] The first original optical signal may be an optical signal transmitted by the beam splitter 4131, or may be an optical signal reflected by the beam splitter 4131. This is not limited. If the first original optical signal is an optical signal transmitted by the beam splitter 4131, the second original optical signal is an optical signal reflected by the beam splitter 4131. The first original optical signal may be an optical signal reflected by the beam splitter 4131, or may be an optical signal transmitted by the beam splitter 4131.

[0124] 5, for example, the first original optical signal is the optical signal transmitted by the beam splitter 4131, and the second original optical signal is the optical signal reflected by the beam splitter 4131. In this case, the first original optical signal is the initial optical signal output by the light source component 41, and the second original optical signal is reflected to the photodetector 4132 and 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 requirement.

[0125] The photodetector 4132 is configured to receive the second original optical signal reflected by the beam splitter 4131, convert the optical pulse signal in the second original optical signal into an electrical signal, and obtain optical intensity information of the optical pulse signal in the second original optical signal. Then, the photodetector 4132 transmits the detected optical intensity information to the processor 4133.

[0126] Optionally, the photodetector 4132 may be a photoelectric sensor, such as, but not limited to, a charge coupled device (CCD).

[0127] The processor 4133 is configured to receive the light intensity information sent from the light detector 4132, and determine, based on the light intensity information, an actual output power of the light pulse signal in the original optical signal generated by the light source 411. Then, based on the determined actual output power, the processor 4133 can determine whether the actual output power meets the rated requirement.

[0128] If it is determined that the actual output power does not meet the rated requirement, the processor 4133 generates a power adjustment signal based on the actual output power and the power of the optical pulse signal previously obtained by the light source 411. Specifically, the processor 4133 may generate the power adjustment signal based on a difference between the actual output power and the power of the optical pulse signal previously obtained by the light source 411.

[0129] The processor 4133 may then send a power adjustment signal to the light source 411. In this way, the light source 411 can adjust the parameters of the light source 411 based on 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.

[0130] It should be noted that, when the light source component 41 includes the optical power adjusting module 413, when the light source 411 generates the original optical signal, if the optical pulse signal of the original optical signal is used to write data to be written, the optical pulse signal power pre-obtained by the light source 411 is greater than a first preset power; if the optical pulse signal in the original optical signal is used to write data to be written, the optical pulse signal power pre-obtained by the light source 411 is greater than a second preset power. This is because the optical power can be adjusted to determine whether the actual output power of the optical pulse signal of the original optical signal generated by the light source 411 meets the rated requirement. adjustment This is because the beam splitter 4131 of the module 413 needs to split off a part of the optical pulse signal generated by the light source 411. The details will not be described again here.

[0131] Further, with reference to Figure 4, the optical deflector 42 is configured to receive the first optical signal and deflect the first optical signal.

[0132] In a possible implementation, as shown in Fig. 4, the optical deflector 42 can receive an initial optical signal generated by a light source component 41 that has the same optical axis as the optical deflector 42. In this case, there is no other optical device between the optical deflector 42 and the light source component 41. That is, the initial optical signal generated by the light source component 41 is the first optical signal.

[0133] In another possible implementation, as shown in FIG. 6, the deflector 42 may receive an initial optical signal generated by a light source component 41 having a different optical axis than the optical deflector 42 .

[0134] In this case, the data reading / writing system 40 may further include a reflector 46. The reflector 46 is configured to reflect the initial optical signal generated by the light source component 41 to the optical deflector 42. In this manner, the optical deflector 42 may receive the initial optical signal generated by the light source component 41 and reflected by the reflector 46. In this case, the optical signal obtained after the initial optical signal generated by the light source component 41 is reflected by the reflector 46 is the first optical signal.

[0135] In this case, it can be seen that the propagation direction of the initial optical signal is deflected by the reflector 46. For example, as shown in Fig. 6, the propagation direction of the initial optical signal is deflected by 90° by the reflector 46.

[0136] Since the initial optical signal is a pulsed optical signal, the first optical signal is also a pulsed optical signal.

[0137] Optionally, the reflector 46 may be a flat reflector or a prismatic reflector, but this is not a limitation.

[0138] The arrangement of the reflector 46 shown in FIG. 6 is merely an example, and is not limited to this.

[0139] It should be understood that the optical deflector 42 may be any type of optical deflector. Here, for the relevant description of the optical deflector, please refer to the above description. The details will not be described again here. For ease of explanation, the embodiment of the present application will be described by taking an example in which the optical deflector 42 is an acousto-optical deflector.

[0140] Specifically, it can be seen from the above description of the acousto-optical deflector that the optical deflector 42 can sequentially deflect the first optical signal received during a preset period at a plurality of angles to obtain a plurality of second optical signals. The plurality of angles correspond one-to-one to the plurality of second optical signals. The plurality of angles are the exit angles of the plurality of second optical signals, and the exit angles can include the included angles between the plurality of second optical signals and the first optical signal. This is not limited. For the description of the preset period, please refer to the description of the preset period above. Details will not be described again here.

[0141] Since the first optical signal is a pulse-type optical signal, the multiple second optical signals are optical signals obtained after the multiple optical pulse signals in the first optical signal are sequentially deflected by the optical deflector 42 for a predetermined period of time.

[0142] It should be noted that the optical deflector 42 in the present embodiment of the present application may generally deflect an optical signal in a one-dimensional plane, so that the multiple second optical signals obtained after the optical deflector 42 deflects the first optical signal are in one plane.

[0143] For example, FIG. 7 is a schematic diagram of three optical pulse signals in a first optical signal received during a preset period being sequentially deflected in a direction 1 by an optical deflector 42. As shown in FIG. 7, the optical deflector 42 can receive an optical pulse signal 1 in the first optical signal at a time point 1 and deflect the optical pulse signal 1 by an angle 1 to obtain an optical signal 1. Similarly, the optical deflector 42 can receive an optical pulse signal 2 in the first optical signal at a time point 2 and deflect the optical pulse signal 2 by an angle 2 to obtain an optical signal 2. The optical deflector 42 can receive an optical pulse signal 3 in the first optical signal at a time point 3 and deflect the optical pulse signal 3 by an angle 3 to obtain an optical signal 3. The optical signal 1, the optical signal 2, and the optical signal 3 are three second optical signals.

[0144] Angle 1 may be the angle between optical pulse signal 1 and optical signal 1 of the first optical signal, angle 2 may be the angle between optical pulse signal 2 and optical signal 2 of the first optical signal, and angle 3 may be the angle between optical pulse signal 3 and optical signal 3 of the first optical signal.

[0145] It should be understood that the included angle between optical signal 1 and optical signal 3 is equal to or less than the angular range (eg, the above-mentioned Δθ) over which acousto-optic deflector 42 can deflect the optical signal.

[0146] The read / write optical head 43 sequentially focuses the received second optical signals onto the optical storage medium 44 to write the data points.

[0147] In addition, since the multiple second optical signals are on a single plane, the multiple second optical signals are focused onto multiple data points written to the optical storage medium 44 by the read / write optical head 43, and the data points are arranged in a linear manner.

[0148] The read / write optical head 43 may be any optical device with a focusing function, such as a lens or an objective lens, but is not limited thereto. The lens here may be any lens, such as, but not limited to, a single lens, a combination lens, a small spherical lens, etc.

[0149] For example, as shown in FIG. 7, after receiving optical signal 1, the read / write optical head 43 can focus the optical signal 1 on point A on the optical storage medium 44 to write data point A. Similarly, after receiving optical signal 2, the read / write optical head 43 can focus the optical signal 2 on point B on the optical storage medium 44 to write data point B. After receiving optical signal 3, the read / write optical head 43 can focus the optical signal 3 on point C on the optical storage medium 44 to write data point C. It can be seen that the read / write optical head 43 sequentially writes data point A, data point B, and data point C to the optical storage medium 44 in direction 1 at different times. It can be seen that data point A, data point B, and data point C are arranged in a straight line.

[0150] In a possible implementation, when the optical storage medium 44 is stationary, the data points written to the optical storage medium 44 by the read / write optical head 43 are linearly aligned with the direction in which the optical deflector 42 deflects the first optical signal.

[0151] For example, as shown in FIG. 8(a), data point A, data point B, and data point C written by read / write optical head 43 to circular optical storage medium 44 are aligned linearly in the direction (direction 1) in which optical deflector 42 deflects the first optical signal.

[0152] As shown in FIG. 8(c), data points A, B, and C written by the read / write optical head 43 to the rectangular optical storage medium 44 are aligned linearly in the direction (direction 1) in which the optical deflector 42 deflects the first optical signal.

[0153] In another possible implementation, when the optical storage medium 44 is in a moving state, the data points written by the read / write optical head 43 to the optical storage medium 44 are linearly aligned in a direction having a preset included angle with the direction in which the optical deflector 42 deflects the first optical signal, where the preset angle is proportional to the moving speed of the optical storage medium 44.

[0154] In this case, the data read / write system 40 may further include a first moving platform 45. The first moving platform 45 is configured 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 of the optical axis of the read / write optical head 43. For simplicity, in the embodiments of the present application, the "axial direction of the read / write optical head 43" is abbreviated to "axial direction".

[0155] If the first moving platform 45 is configured to control the optical storage medium 44 to rotate in a plane perpendicular to the axial direction, the first moving platform 45 may be a rotational platform. If the first moving platform 45 is configured to control the optical storage medium 44 to translate in a plane perpendicular to the axial direction, the first moving platform 45 may be a one-dimensional or multi-dimensional direct moving platform. This is not limited.

[0156] For example, as shown in FIG. 8(b), when the first moving platform 45 controls the circular optical storage medium 44 to rotate in the rotation direction shown in FIG. 8(b), the data points A, B, and C written to the optical storage medium 44 by the read / write optical head 43 are sequentially arranged linearly in a direction 2 having a preset included angle α with the direction 1 in which the optical deflector 42 deflects the first optical signal.

[0157] As shown in FIG. 8(d), a first moving platform 45 moves a rectangular optical storage medium 44 in the direction of the arrow in FIG. d ), data points A, B, and C written to the optical storage medium 44 by the read / write optical head 43 are sequentially arranged linearly in a direction 3 having a preset included angle β with the direction 1 in which the optical deflector 42 deflects the first optical signal.

[0158] 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 periods, and sequentially focus the multiple second optical signals on the optical storage medium 44 to realize writing of multiple data channels.

[0159] The amount of the multiple data channels corresponds to the amount of multiple second optical signals obtained by the read / write optical head 43 deflecting the first optical signal during a preset period of time. That is, the amount of the multiple data channels corresponds to the amount of multiple data points written to the optical storage medium 44 by the read / write optical head 43 sequentially focusing the multiple second optical signals on the optical storage medium 44. Also, the multiple data channels include multiple data points, and each of the multiple data channels passes through one of the multiple data points. That is, the multiple data channels correspond one-to-one to the multiple data points.

[0160] In this case, multiple data channels may form one data band, so that a single optical signal beam (i.e., an initial optical signal) generated by the light source component 41 can be written in parallel to multiple data channels on the optical storage medium 44 via the optical path of the data reading / writing system 40, thereby improving the data reading / writing efficiency.

[0161] For example, as shown in FIG. 8(b), when the first moving platform 45 controls the circular optical storage medium 44 to rotate in the rotation direction shown in FIG. 8(b), the data points written by the read / write optical head 43 in a preset period include data point A, data point B, and data point C. In this case, the read / write optical head 43 can write three data channels (including data channel 1, data channel 2, and data channel 3) to the optical storage medium 44 in multiple preset periods. Data channel 1 passes through data point A, data channel 2 passes through data point B, and data channel 3 passes through data point C. Here, the three data channels can form a ring-shaped data band, such as the data band 441 shown in FIG. 4 or FIG. 6. It should be understood that the data band 441 shown in FIG. 4 or FIG. 6 is a cross-sectional view of a data band.

[0162] As shown in FIG. 8(d), a first moving platform 45 moves a rectangular optical storage medium 44 in the direction of the arrow in FIG. d ), the data points written by the read / write optical head 43 during a preset period include data point A, data point B, and data point C. In this case, the read / write optical head 43 can write three data channels (including data channel 1, data channel 2, and data channel 3) to the optical storage medium 44 during multiple preset periods. Data channel 1 passes through data point A, data channel 2 passes through data point B, and data channel 3 passes through data point C. Here, the three data channels may form a rectangular data band.

[0163] It should be noted that the amount of data points for each of the multiple data channels is equal to the amount of the preset period required for the read / write optical head 43 to write the multiple data channels to the optical storage medium 44 .

[0164] For example, if the read / write optical head 43 writes multiple data channels to the optical storage medium 44 within m preset periods of time, there will be m data points in each of the multiple data channels, where m is a positive integer.

[0165] In addition, if the optical storage medium 44 is an optical storage medium including multiple storage layers, the first moving platform 45 may be configured to control the axial movement of the optical storage medium 44 so as to cause the read / write optical head 43 to focus multiple second optical signals on different storage layers of the optical storage medium 44 and write a data band to each storage layer.

[0166] Optionally, see Figures 5 and 9. The data read / write system 40 may further include a radial movement station 91. The radial movement station 91 is disposed on a primary support 92, and may also use components such as an optical lens frame to position the optical deflector 42, the reflector 46, and the read / write optical head 43 on the primary support 92. In this manner, the radial movement station 91 may be configured to move the optical deflector 42, the reflector 46, and the read / write optical head 43 a first preset distance to write a second data band on the first storage layer of the multiple storage layers of the optical storage medium 44 after the read / write optical head 43 completes writing a first data band on a surface perpendicular to the axial direction.

[0167] The first preset distance is greater than the width of the first data band. The specific value of the first preset distance is not specifically limited in the embodiments of the present application.

[0168] The first data band and the second data band may be two adjacent data bands or two non-adjacent data bands, this is not limited.

[0169] It should be appreciated that if the light source component 41 and the read / write optical head 43 in the data reading / writing system 40 share an optical axis, the light source component 41 may also be disposed on the primary support 92. In this manner, the radial movement station 91 may be configured to, after the read / write optical head 43 completes writing a first data band in a plane perpendicular to the axial direction in a first storage layer of the multiple storage layers of the optical storage medium 44, move the light source component 41, the optical deflector 42, the reflector 46, and the read / write optical head 43 a first preset distance to write a second data band in the first storage layer.

[0170] For example, FIG. 10 is a schematic diagram of a data read / write system 40 controlling radial movement station 91 to move a preset distance to write different data bands.

[0171] 10(a), after writing the ring data band 1 on the optical storage medium 44, the data read / write system 40 controls the radial movement station 91 to move a preset distance d1 in a direction perpendicular to the axial direction (i.e., in a radial direction) to perform writing of the ring data band 2, where d1 is equal to or greater than the width of the data band 1.

[0172] 10(b), after writing the rectangular data band 1 on the optical storage medium 44, the data reading / writing system 40 controls the radial movement station 91 to move a preset distance d2 in a direction perpendicular to the axial direction (i.e., in a radial direction) to write the rectangular data band 2, where d2 is equal to or greater than the width of the data band 1.

[0173] It should be understood that the data bands written to the optical storage medium 44 by the data read / write system 40 using the read / write optical head 43 include data points for storing data and data points used as servo points, where the servo points are used to adjust the position of the focal point of the optical signal focused by the read / write optical head 43. In the embodiment of the present application, the data channel including the servo points is referred to as a servo channel.

[0174] A data band can include at least one servo channel, and any one of the at least one servo channels includes multiple servo points. For ease of explanation, the following description of this embodiment of the present application uses an example in which a data band includes one servo channel.

[0175] In one embodiment, for a plurality of servo points on a servo channel in any data band in optical storage medium 44, the plurality of servo points may be distributed contiguously on the servo channel or may be distributed discretely on the servo channel, but is not limited thereto.

[0176] When the plurality of servo points are distributed discretely on the servo channel, the plurality of servo points may be evenly distributed on the servo channel at intervals of the second preset distance. Of course, the plurality of servo points may be randomly and discretely distributed on the servo channel. This is not limited. The distance between any two adjacent servo points among the plurality of servo points is equal to or greater than the second preset threshold. The values ​​of the second preset distance and the second preset threshold are not particularly limited in this embodiment of the present application.

[0177] In another embodiment, the servo points of each of the multiple storage layers of the optical storage medium 44 are distributed discretely in the axial direction. For convenience of explanation, the optical storage medium 44 is described as including p storage layers (p is an integer greater than 1).

[0178] In a first possible implementation, in p storage layers included in the optical storage medium 44, servo channels of data bands that overlap in the axial direction in each storage layer overlap in the axial direction. Also, in a first storage layer and a second storage layer that are separated by q storage layers (q is a positive integer greater than 1) among the p storage layers, if a first servo channel of the first storage layer axially overlaps a second servo channel of the second storage layer, a straight line that passes through any servo point on the first servo channel and is parallel to the axial direction also passes through a servo point on the second servo channel. The first servo channel is any servo channel of the first storage layer, and the second servo channel is a servo channel in the second storage layer that axially overlaps with the first servo channel.

[0179] When either the first or second memory layer is a third memory layer, and the third servo channel of the third memory layer overlaps with the first servo channel of the first memory layer (or the second servo channel of the second memory layer) in the axial direction, a straight line passing through any servo point of the third servo channel and parallel to the axial direction does not pass through any servo point of any memory layer except the first memory layer, the second memory layer, and the third memory layer between the first and second memory layers. This indicates that the servo points on the first memory layer and each memory layer before the second memory layer do not overlap with each other in the axial direction.

[0180] In this way, in p storage layers, the servo points of the p storage layers are discretely distributed at intervals of q storage layers in the axial direction, and the servo points on any servo channel of each storage layer are discretely distributed.

[0181] For example, Fig. 11 is a schematic diagram of servo points distributed discretely on circular servo channels overlapping in the axial direction. (a) Fig. 11 shows a front view of 16 circular servo channels overlapping in the axial direction. As shown in Fig. 11(a), the 16 servo channels overlapping in the axial direction include a servo channel 1-1 in memory layer 1, a servo channel 2-1 in memory layer 2, a servo channel 3-1 in memory layer 3, a servo channel 4-1 in memory layer 4, a servo channel 5-1 in memory layer 5, ..., a servo channel 16-1 in memory layer 16.

[0182] As shown in FIG. 11(a), the servo channel 1-1 (i.e., the first servo channel described above) and the servo channel 5-1 (i.e., the second servo channel described above) are separated by three memory layers (respectively, the memory layer 2, the memory layer 3, and the memory layer 4). The servo point s1-1 of the servo channel 1-1 overlaps with the servo point s5-1 of the servo channel 5-1 in the axial direction. The straight line L1 passing through the servo point s2-1 of the servo channel 2-1 and parallel to the axial direction, the straight line L2 passing through the servo point s3-1 of the servo channel 3-1 and parallel to the axial direction, and the straight line L3 passing through the servo point s4-1 of the servo channel 4-1 and parallel to the axial direction do not pass through any of the servo points of the memory layer 1, the memory layer 2, the memory layer 3, and the memory layer 4. That is, the servo points between the memory layer 1 and the memory layer 4 do not overlap in the axial direction. The axial direction is the direction indicated by the optical axis 110 in FIG. 11.

[0183] FIG. 11(b) shows a top view of 16 axially overlapping circular servo channels shown in FIG. 11(a). As shown in FIG. 11(b), servo point s1-1 and servo point s1-2 are servo points on servo channel 1-1 of storage layer 1. Servo point s2-1 and servo point 2-2 are servo points on servo channel 2-1 of storage layer 2. Servo point s3-1 and servo point 3-2 are servo points on servo channel 3-1 of storage layer 3. Servo point s4-1 and servo point 4-2 are servo points on servo channel 4-1 of storage layer 4.

[0184] It can be seen that servo points s1-1, s2-1, s3-1, and s4-1 do not overlap in the axial direction. Servo points s1-1 and s1-2 on servo channel 1-1 are distributed discretely in the radial direction at intervals of three data points. Servo points s2-1 and s2-2 on servo channel 2-1 are distributed discretely in the radial direction at intervals of three data points. Servo points s3-1 and s3-2 on servo channel 3-1 are distributed discretely in the radial direction at intervals of three data points. Servo points s4-1 and s4-2 on servo channel 4-1 are distributed discretely in the radial direction at intervals of three data points. Here, the radial direction is perpendicular to the axial direction.

[0185] Similarly, servo point s5-1 on servo channel 5-1 overlaps with servo point s9-1 on servo channel 9-1 in the axial direction, and the servo points between memory layer 5 and memory layer 8 do not overlap in the axial direction. Servo point s9-1 on servo channel 9-1 overlaps with servo point s13-1 on servo channel 13-1 in the axial direction, and the servo points between memory layer 9 and memory layer 12 do not overlap in the axial direction. The servo points between memory layer 13 and memory layer 16 do not overlap in the axial direction. In this way, with 16 memory layers, the servo points on the servo channels that overlap in the axial direction in the 16 memory layers are discretely distributed at intervals of three memory layers in the axial direction.

[0186] It should be understood that for any of the p servo channels axially overlapping on the p storage layers, the positions of the data points between the discretely distributed servo points on the servo channel are empty, i.e., no content is written to these positions. In this way, when the data read / write system 40 reads data and the optical signal used to read the data acts on the servo points of the storage layer far away from the surface of the optical storage medium 44, the attenuation of the optical signal can be effectively reduced, so that the data read / write system 40 can accurately read the servo points of the storage layer far away from the surface of the optical storage medium 44. This effectively improves the servo efficiency of the data read / write system 40.

[0187] For example, as shown in FIG. 11(a), when an optical signal used to read data acts on servo point s13-1 of memory layer 13 after passing from memory layer 1 to memory layer 12, in this case, when the optical signal passes through three servo points (servo point s1-1 of memory layer 1, servo point s5-1 of memory layer 5, and servo point s9-1 of memory layer 9), attenuation of optical power occurs. In the memory layers from memory layer 1 to memory layer 12 except memory layer 1, memory layer 5, and memory layer 9, data contents are not written at the positions of data points overlapping with servo point s13-1 in the axial direction, so the reflectance of the positions of these data points in the memory layers does not change. In this way, when an optical signal acts on s13-1, the optical signal passes through the positions of these data points, and the optical power attenuation of the optical signal is greatly reduced. This improves the reading accuracy of servo point s13-1 by the optical signal, and effectively improves the servo efficiency of the system.

[0188] In a second possible implementation, optical storage medium 44 includes p storage layers in which the servo channels of axially overlapping data bands in each storage layer do not axially overlap. Thus, the servo points of each of the p storage layers do not axially overlap.

[0189] In this case, it can be understood that the servo points on any servo channel of the optical storage medium 44 may be distributed discretely or continuously. This is not a limitation. If the servo points on the servo channel are distributed discretely, the distance between any two adjacent servo points on the servo channel is equal to or less than a second preset threshold.

[0190] For example, FIG. 12 is a schematic diagram of axially non-overlapping servo channels within axially overlapping data bands in each of multiple storage layers.

[0191] Fig. 12(a) shows a front view of five annular data bands (called data rings) that overlap in the axial direction. As shown in Fig. 12(a), data ring 1-1 is a data ring in memory layer 1, data ring 2-1 is a data ring in memory layer 2, data ring 3-1 is a data ring in memory layer 3, data ring 4-1 is a data ring in memory layer 4, and data ring 5-1 is a data ring in memory 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 the direction indicated by the optical axis 120 in Fig. 12.

[0192] FIG. 12(b) shows a front view of the circular servo channels in the five axially overlapping data rings shown in FIG. 12(a), which do not overlap axially. It should be understood that the servo channels on the data rings are generally circular servo channels. As shown in FIG. 12(b), servo channel 1-1 is the servo channel for data ring 1-1, servo channel 2-1 is the servo channel for data ring 2-1, servo channel 3-1 is the servo channel for data ring 3-1, servo channel 4-1 is the servo channel for data ring 4-1, and servo channel 5-1 is the servo channel for data ring 5-1.

[0193] It can be seen that the difference between the radius of the servo channel 1-1 and the radius of the servo channel 2-1 is d1, the difference between the radius of the servo channel 2-1 and the radius of the servo channel 3-1 is d2, the difference between the radius of the servo channel 3-1 and the radius of the servo channel 4-1 is d3, and the difference between the radius of the servo channel 4-1 and the radius of the servo channel 5-1 is d4. Here, d1, d2, d3, and d4 may be the same or different. This is not limited. That is, the servo channel 1-1, the servo channel 2-1, the servo channel 3-1, the servo channel 4-1, and the servo channel 5-1 do not overlap in the axial direction. In this case, the servo points of the servo channel 1-1, the servo channel 2-1, the servo channel 3-1, the servo channel 4-1, and the servo channel 5-1 do not overlap in the axial direction, that is, the servo points of the data ring 1-1, the data ring 2-1, the data ring 3-1, the data ring 4-1, and the data ring 5-1 do not overlap in the axial direction.

[0194] For more clarity, FIG. 12(c) shows five axially overlapping data rings and a circular servo within the five data rings that does not overlap axially. channel 12(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 channel 1-1, servo channel 2-1, servo channel 3-1, servo channel 4-1, and servo channel 5-1 do not overlap in the axial direction. In other words, the servo points of servo channel 1-1, servo channel 2-1, servo channel 3-1, servo channel 4-1, and servo channel 5-1 do not overlap in the axial direction.

[0195] It should be understood that in any storage layer of the p storage layers, in a data channel overlapping with any servo channel in the axial direction, the data points in the data channel are empty, that is, the data read / write system 40 does not write any content to the data channel. In this design, when the data read / write system 40 reads data and the optical signal used to read the data acts on the servo points of the storage layer far away from the surface of the optical storage medium 44, the attenuation of the optical signal can be effectively reduced, so that the servo points of the storage layer far away from the surface of the optical storage medium 44 can be accurately read. This can effectively improve the servo efficiency of the system. For a specific description, please refer to the description of improving the servo efficiency of the system in the first possible implementation. The details will not be described again here.

[0196] 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 has 50 or 100 storage layers, but is not limited thereto), the data point reading / writing system 40 may write the servo points in a first possible implementation and a second possible implementation. In this case, the optical storage medium 44 may record data in a reflective light manner. By configuring the servo points in two ways in this way, the servo efficiency of the data reading / writing system 40 when reading data can be effectively improved.

[0197] In a third possible implementation, optical storage medium 44 includes p storage layers with axially overlapping servo channels of axially overlapping data bands in each storage layer.

[0198] In this case, the servo points on any servo channel of the optical storage medium 44 may be distributed discretely or continuously. This is not limited. If the servo points on the servo channel are distributed discretely, the distance between any two adjacent servo points on the servo channel is equal to or less than a second preset threshold.

[0199] For example, FIG. 13 is a schematic diagram of servo points distributed on circular servo channels overlapping in the axial direction. FIG. 13(a) shows a front view of eight circular servo channels overlapping in the axial direction. As shown in FIG. 13(a), the servo channel of memory layer 1 is servo channel 1-1, the servo channel of memory layer 2 is servo channel 2-1, ..., and the servo channel of memory layer 8 is servo channel 8-1. It can be seen that servo channel 1-1, servo channel 2-1, ..., and servo channel 8-1 do not overlap in the axial direction. The axial direction is the direction indicated by the optical axis 130 in FIG. 13.

[0200] Figure 13(b) shows a top view of eight axially overlapping circular servo channels. As shown in Figure 13(b), on any one of the axially overlapping servo channels, the servo points may be continuously distributed as shown in Figure 13(b), or may be definitely discretely distributed. This is not limited.

[0201] 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 has 50 or 100 storage layers, but is not limited thereto), the data point reading / writing system 40 may write the servo points in a third possible implementation. In this case, the optical storage medium 44 may record data in an autofluorescence manner. By configuring the servo points in this manner, the servo efficiency of the data reading / writing system 40 when reading data can be effectively improved. For the relevant description of the autofluorescence manner, please refer to the above description. The details will not be described again here.

[0202] Of course, if the optical storage medium 44 includes a small amount of storage layer and the data reading / writing system 40 configures the write servo points in the third possible implementation, the optical storage medium 44 can also record data in a reflective optical manner.

[0203] It should be understood from the above description that the data read / write system 40 deflects the optical signal separately at multiple preset time periods to write data points at different locations on the optical storage medium 44 at different times during the course of moving the optical storage medium 44. Thus, the data read / write system 40 can control the light source component 41 to generate the power of the initial optical signal used to write servo points at multiple preset time points to write servo points located on the optical storage medium 44 in any of the possible implementations described above. The multiple preset time points correspond one-to-one to the servo points located in any of the possible implementations described above.

[0204] In this case, it can be understood that when the data read / write system provided in the embodiment of the present application writes data, the data read / write system simply uses an optical deflector to sequentially deflect the first optical signal obtained after modulating the initial optical signal generated by the light source component, and writes a row of data points on the optical storage medium in a preset period. The data read / write system also realizes writing multiple rows of data points on the optical storage medium in the moving direction of the optical storage medium in multiple preset periods by controlling the movement of the optical storage medium. This realizes writing a data band including multiple data channels. That is, the data read / write system provided in the embodiment of the present application writes data on the moving optical storage medium, and realizes simultaneous writing of multiple data channels in a data band on the optical storage medium by controlling a single optical signal, that is, writing data in parallel through a single optical signal. Therefore, the embodiment of the present application improves the data writing efficiency of the data read / write system without increasing the rotation speed of the optical storage medium.

[0205] In addition, when the data read / write system 40 provided in the embodiment of the present application is configured to read data, the data read / write system further includes an optical signal isolation module and signalIncludes a processing module.

[0206] With respect to FIG. 9, reference is now made to FIG. 14. As shown in FIG. 14, the data read / write system 40 further includes an optical signal separation module 141 and signal The processing module 142 is included.

[0207] It should be understood that when the data reading / writing system 40 is configured to read data stored on the optical storage medium 44, the data stored on the optical storage medium 44 is written via the optical path of the data reading / writing system 40 as described above.

[0208] For a relevant description of the light source component 41, the reflector 46, the optical deflector 42, the read / write optical head 43, and the radial movement station 91 in the data read / write system 40 when the data read / write system 40 is configured to read data, please refer to the above relevant description of the light source component 41, the reflector 46, the optical deflector 42, the read / write optical head 43, and the radial movement station 91 when the data read / write system 40 is configured to write data, which will not be described again here.

[0209] It should be noted that when the data read / write system 40 is configured to read data, and the multiple second optical signals obtained after the initial optical signal generated by the light source component 41 passes through the reflector 46 and the optical deflector 42 are sequentially focused on the optical storage medium 44 by the read / write optical head 43, the physical and / or chemical properties of the second optical signal do not change. In the embodiment of the present application, when the data read / write system 40 is configured to read data, an example is described in which the power of the initial optical signal generated by the light source component 41 is the third preset power. It should be noted that when the optical signal having the third preset power acts on the optical storage medium 44, the physical and / or chemical properties of the optical signal do not change.

[0210] Optionally, the read / write optical head 43 may be located on a second moving platform 143. The second moving platform 143 may be configured to axially move the read / write optical head 43 and axially adjust the position of the focal point of the optical signal focused by the read / write optical head 43.

[0211] The second moving platform 143 can receive the axial servo signal sent by the processor 1422 in the signal processing module 142, and further move the read / write optical head 43 in the axial direction according to the instruction of the axial servo signal, and axially adjust the position of the focal point of the optical signal collected by the read / write optical head 43. Here, the relevant description of the axial servo signal can be seen below. The details will not be described again here.

[0212] For example, the second moving platform 143 may be a one-dimensional electric direct moving platform. For example, the second moving platform 143 may be a z-axis electric platform, but is not limited thereto.

[0213] Optionally, the reflector 46 can also be disposed on a third moving platform 144. The third moving platform 144 can be configured to move the reflector 46 in a radial direction perpendicular to the axial direction (referred to as the radial direction for short) to radially adjust the position of the focal point of the optical signal collected by the read / write optical head 43.

[0214] The third moving platform 144 can receive the radial servo signal sent by the processor 1422 in the signal processing module 142, and further move the read / write optical head 43 in the radial direction according to the instruction of the radial servo signal, and adjust the focal position of the optical signal focused by the read / write optical head 43 in the axial direction. Here, the relevant description of the radial servo signal can be seen below. The details will not be described again here.

[0215] For example, the third moving platform 144 may be a two-dimensional electrical direct moving platform. For example, the third moving platform 144 may be an x-y axis electrical platform, but is not limited thereto.

[0216] For example, referring to FIG. 14, FIG. 15 is a schematic diagram of using a third moving platform 144 to move a reflector 46 to radially adjust the focal position of the optical signal focused by the read / write optical head 43.

[0217] 15(a), when the reflector 46 is at position 1, an initial optical signal incident from the light source component 41 is reflected by the reflector 46 to obtain a reflected optical signal 1. The reflected optical signal 1 passes through the optical signal separation module 141, the optical deflector 42, and the read / write optical head 43 and acts on the optical storage medium 44 to read a 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 of the optical signal focused by the read / write optical head 43 when the reflector 46 is at position 1.

[0218] When the third moving platform 144 (not shown in FIG. 15 ) controls the reflector 46 to move to position 2 on the x-axis on a plane in which the radial direction is, in this case the reflector 46 reflects the initial optical signal incident by the light source component 41 into a reflected optical signal 2. In this manner, the reflected optical 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 to read the data point 2 on the optical storage medium 44. It should be understood that the position of the data point 2 is the position of the focal point of the optical signal focused by the read / write optical head 43 when the reflector 46 moves to position 2.

[0219] It can be seen that the third moving platform 144 controls the radial movement of the reflector 46 to thereby radially move the position of the focal point of the optical signal focused by the read / write optical head 43 .

[0220] Figure 15(b) is a schematic diagram of an example of the axial and radial directions. As shown in Figure 15(b), the z-axis is the axial direction of the read / write optical head 43, and the plane in which the x-axis and y-axis lie is a plane perpendicular to the axial direction. Therefore, the x-axis and y-axis are radial directions.

[0221] Further referring to Fig. 14, the optical signal separation module 141 is configured to separate the optical signal returning after acting on the optical storage medium 44 from the optical path of the optical signal used by the data reading / writing system 40 to read data and act on the optical storage medium 44 to obtain a third optical signal.

[0222] It should be understood that the optical path of the optical signal used to impinge on the optical storage medium 44 is typically the reverse of the optical path of the optical signal returning after impinging on the optical storage medium 44. In this context, reversed optical path phase means that the optical path channel is the same, but the optical signals propagate in opposite directions.

[0223] For example, as shown in Fig. 14, the optical signal used to read data may act on the optical storage medium 44 in direction 2. Then, after the optical signal acts on the optical storage medium 44, the optical signal returned from the optical storage medium 44 may return to direction 3 shown in Fig. 13, and the optical signal separation module 141 separates the optical signal from the optical path of the optical signal used to act on the optical storage medium 44 to obtain a third optical signal.

[0224] In some cases, if the optical storage medium 44 records data using an autofluorescence method, the optical signal returned from the optical storage medium 44 is a fluorescent signal that is transmitted autonomously by the optical storage medium 44 after a plurality of second optical signals act sequentially on the optical storage medium 44. In this case, the optical signal separation module 141 includes a dichroic mirror, which can transmit long-wavelength laser light and reflect short-wavelength fluorescence.

[0225] In this way, a dichroic mirror can be used to separate the optical signal returned by the optical storage medium 44 from the optical path of the optical signal used to act on the optical storage medium to obtain a third optical signal.

[0226] In another possible case, if the optical storage medium 44 records data in a reflective optical manner, the optical signal returned from the optical storage medium 44 is the optical signal reflected by the optical storage medium 44 after a plurality of second optical signals act sequentially on the optical storage medium 44. In this case, the optical signal separation module 141 can include a polarizing spectrometer 1411 and a wave plate 1412. In this way, the polarizing spectrometer 1411 and the wave plate 1412 can separate the optical signal returned by the optical storage medium 44 from the optical path of the optical signal used to act on the optical storage medium, and obtain the third optical signal.

[0227] For the process by which the optical signal used to read data acts on the optical storage medium 44, refer to the above process by which the optical signal used to write data to the optical storage medium 44 acts, and the details will not be described again here.

[0228] The polarizing spectrometer 1411 is configured to receive the initial optical signal reflected by the reflector 46 and send the initial optical signal to the wave plate 1412. In the embodiment of the present application, the optical signal sent to the wave plate 1412 is referred to as a fourth optical signal.

[0229] Specifically, the polarization spectrometer 1411 can be configured to transmit p-polarized light in the initial optical signal and reflect s-polarized light in the initial optical signal after receiving the initial optical signal. Here, the fourth optical signal may be p-polarized light or s-polarized light. This is not limited. As shown in FIG. 14, in the embodiment of the present application, a case where the fourth optical signal is p-polarized light will be described as an example.

[0230] For example, the polarizing beam splitter 1411 may be a polarizing splitter prism, or of course may be another polarizing beam splitter. This is not a limitation.

[0231] The wave plate 1412 is configured to receive the fourth optical signal transmitted by the polarizing spectrometer 1411, adjust the phase of the fourth optical signal, and output the first optical signal. Also, the wave plate 1412 is configured to receive the optical signal returned by the optical storage medium 44 via the read / write optical head 43 and the optical deflector 42, adjust the phase of the optical signal, and output 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 light, the fifth optical signal is s-polarized light. Or, if the fourth optical signal is s-polarized light, the fifth optical signal is p-polarized light. In this embodiment of the present application, an example will be described in which the fourth optical signal is p-polarized light and the fifth optical signal is s-polarized light.

[0232] The first optical signal is processed by the optical deflector 42 and the read / write optical head 43 and acted on the optical storage medium 44, and then the optical signals returning from the optical storage medium 44 are sequentially reverse-processed by the read / write optical head 43 and the optical deflector 42 and passed through the wave plate 1412 to obtain the fifth optical signal.

[0233] For example, the wave plate 1412 may be a quarter wave plate. A quarter wave plate can shift the phase of a received optical signal by a quarter wavelength. Therefore, when the optical signal passes through the quarter wave plate twice in succession, the polarization state of the optical signal changes. For example, p-polarized light changes to s-polarized light after passing through the quarter wave plate twice in succession. Or, s-polarized light changes to p-polarized light after passing through the quarter wave plate twice in succession.

[0234] In the data read / write system 40 provided in the embodiment of the present application, a wave plate 1412 is typically disposed. When the optical signal passes through the wave plate 1412 and acts on the optical storage medium 44, the optical storage medium 44 can return the optical signal along the original path. In this way, the returned optical signal passes through the wave plate 1412. This corresponds to the optical signal passing through the wave plate 1412 twice in succession. In this way, if the fourth optical signal first processed by the wave plate 1412 is p-polarized light, the fourth optical signal acts on the optical storage medium 44 after passing through the wave plate 1412, the optical deflector 42, and / or the read / write optical head 43. The optical signal is returned along the original path by the optical storage medium 44 and can pass through the wave plate 1412 again to obtain the fifth optical signal, i.e., s-polarized light.

[0235] The polarizing spectrometer 1411 may be configured to receive the fifth optical signal, and reflect and output the fifth optical signal based on a polarization splitting principle to obtain a third optical signal.

[0236] For example, with reference to FIG. 14, the process by which optical signal separation module 141 separates the optical signal returned by optical storage medium 44 is described below.

[0237] As shown in Fig. 14, after the initial optical signal reflected by the reflector 46 reaches the polarizing spectrometer 1411, the p-polarized light in the initial optical signal passes through the operating surface of the polarizing spectrometer 1411 (i.e., the diagonal surface of the polarizing spectrometer 1411 shown using diagonal lines in the squares in Fig. 14) to obtain a fourth optical signal, where the fourth optical signal is p-polarized light.

[0238] Then, the fourth optical signal reaches the wave plate 1412 along the direction 2, passes through the wave plate 1412, and obtains the first optical signal whose phase changes by 1 / 4 wavelength. Then, 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 may reach the wave plate 1412 in the direction 3 opposite to the direction 2. A fifth optical signal is obtained after the returned optical signal passes through the wave plate 1412. Compared with the phase of the optical signal returned by the optical storage medium 44, the phase of the fifth optical signal changes by 1 / 4 wavelength. That is, compared with the phase of the fourth optical signal, the phase of the fifth optical signal changes by 1 / 2 wavelength. In this case, the fifth optical signal is s-deflected light.

[0239] Furthermore, the polarizing spectrometer 1411 receives the fifth optical signal. Since the fifth optical signal is s-polarized light, the fifth optical signal is reflected by the operating surface of the polarizing spectrometer 1411 and output to obtain the third optical signal. In this manner, the optical signal separation module 141 changes the polarization state of the optical signal, and by using the polarizing spectrometer, separates the optical signal that returns after the optical signal acts on the optical storage medium 44 from the optical path of the optical signal that is used to act on the optical storage medium 44.

[0240] signal The processing module 142 includes a photodetector 1421 and a processor 1422. The processor 1422 may be the same processor as the processor 4133 in Fig. 5, or may be a different processor. This is not limited.

[0241] The photodetector 1421 is configured 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 photodetector 1421 to determine data to be read or to determine a servo control signal.

[0242] The photodetector 1421 may be a photoelectric sensor, for example, a CCD, but is not limited thereto.

[0243] Specifically, after receiving the third optical signal, the optical detector 1421 can determine the optical intensity of the third optical signal and spot information of the spot formed by the third optical signal on the optical detector 1421. The spot information includes the spot shape and the spot size. Then, the optical detector 1421 sends the determined optical intensity and the spot information of the third optical signal to the processor 1422 for further processing.

[0244] Then, in some cases, if the third optical signal is an optical signal returned by the data reading / writing system 40 after acting on a data point used to store data in the optical storage medium 44, the third optical signal is a data optical signal, so that the processor 1422 can obtain the data to be read by decoding based on the optical intensity of the third optical signal and a preset decoding rule.

[0245] It should be understood that the data stored in the data read / write system 40 is data after the data to be read is encoded according to a preset encoding rule. Therefore, a decoding rule corresponding to the encoding rule is preset in the data read / write system 40. Thus, when reading the data to be read, the data read / write system 40 can decode the data read from the optical storage medium according to the preset decoding rule to obtain the data to be read.

[0246] In another case, the third optical signal is a servo optical signal if it is an optical signal returned by the data read / write system 40 after acting on a servo point on the optical storage medium 44. In this way, the processor 1422 can generate a servo control signal based on the preset information of the servo point and the optical intensity and spot information of the third optical signal to adjust the position of the focus of the optical signal focused by the read / write optical head 43.

[0247] Thus, from the above description, it can be seen that the data read / write system 40 can control the light source component 41 to generate the power of an initial optical signal used to write a servo point at a plurality of preset time points to be written to the servo points located on the optical storage medium 44 in any of the above possible implementations. The plurality of preset time points correspond one-to-one to the servo points located in any of the possible implementations. Thus, the data read / write system 40 can determine whether the third optical signal is a servo optical signal by determining whether the time point at which the third optical signal is received is a preset time point corresponding to the servo point. The correspondence between the preset time points and the servo points is preset in the processor 1422.

[0248] The preset information of the servo point includes the light intensity and spot information of the servo point. The light intensity and spot information refers to the information of the light signal returned from the servo point when the light signal used to read the data is accurately focused on the servo point, among the light intensity and spot information detected by the photodetector 1421. The returned light signal may be a reflected light signal or a fluorescent signal. This is not limited. The power of the light signal used to read the data may be a third preset power.

[0249] The light intensity and spot information of the preset information of the servo points can be obtained by pre-measurement.

[0250] For example, the data read / write system 40 can use an optical signal with a third preset power to be precisely focused on any servo point (e.g., the power written to all servo points is the same) on the optical storage medium 44 via the optical path of the data read / write system 40 in FIG. 14. Then, the optical detector 1421 receives the optical signal returned by any servo point and determines the optical intensity and spot information of the optical signal. In this way, the optical intensity and spot information are the preset information of the servo point.

[0251] For ease of explanation, in the embodiment of the present application, the light intensity in the preset information is called the first light intensity, and the spot information in the preset information is called the first spot information. In addition, in the embodiment of the present application, the light intensity of the third optical signal received by the processor 1422 is called the second light intensity, and the spot information of the third optical signal received by the processor 1422 is called the second spot information.

[0252] In this manner, the processor 1422 can determine a servo control signal based on the received second light intensity and second spot information and the preset first light intensity and first spot information. The servo control signal includes at least one of a focus servo signal or a track servo signal.

[0253] In one aspect, the processor 1422 may determine a direction in which to adjust the position of the focal point of the optical signal focused by the read / write optical head 43 using a servo control signal based on the spot size and spot shape of the first spot information and the spot size and spot shape of the second spot information.

[0254] For example, FIG. 16 is a schematic diagram of an adjustment direction determined based on the spot size and spot shape when adjusting the position of the focal point of an optical signal focused by the read / write optical head 43 using a servo control signal.

[0255] As shown in FIG. 16, the solid circle represents a spot 161 of preset information of the servo point. The overlapping portion of the solid circle and the dashed circle represents a spot 162 corresponding to a third optical signal. As shown in FIG. 16, the processor 1422 may determine that the read / write optical head 43 does not accurately focus the optical signal used to act on the servo point on the optical storage medium 44 based on the shape and size of the spot 161 and the spot 162. In addition, the processor 1422 may further determine a position of the focal point of the optical signal focused by the read / write optical head 43 that needs to be adjusted in the axial direction of the read / write optical head 43 closer to the optical storage medium 44.

[0256] FIG. 17 is a schematic diagram of another adjustment direction determined based on the spot size and spot shape when adjusting the position of the focal point of the optical signal focused by the read / write optical head 43 using a servo control signal.

[0257] 17, the solid circle represents spot 171 of preset information of the servo point. The overlapping portion of the solid circle and the dashed circle represents spot 172 corresponding to the third optical signal. As shown in FIG. 17, based on the shape and size of spot 171 and spot 172, processor 1422 may determine the position of the focal point of the optical signal focused by read / write optical head 43 and adjusted in the positive x-axis direction and the positive y-axis direction in the radial direction of read / write optical head 43 (i.e., the x-axis direction and the y-axis direction shown in FIG. 13).

[0258] In another embodiment, the processor 1422 may determine a focusing error and a tracking error of the data reading / writing system 40 based on the first light intensity and the second light intensity.

[0259] Specifically, for any servo point, the processor 1422 may perform a difference between the first light intensity and the second light intensity and determine the focusing error and tracking error of the data reading / writing system 40 based on the difference.

[0260] Optionally, the designer may preset in the processor 1422 the correspondence between the difference between the different light intensities and the first light intensity and the focusing error and tracking error of the data reading / writing system 40 based on a large amount of test results in advance.

[0261] This enables the processor 1422 to determine the focusing and tracking errors of the data reading / writing system 40 based on the correspondence and difference between the first and second light intensities.

[0262] Then, if the focusing error determined by the processor 1422 is greater than a third preset threshold, the processor 1422 can generate a focus servo signal based on the determined adjustment direction and the determined focusing error, where the focus servo signal is used to indicate adjusting the position of the read / write optical head 43 in the axial direction of the read / write optical head 43, and adjust the focus position of the optical signal focused by the read / write optical head 43 in the axial direction.

[0263] It should be understood that if the focusing error determined by the processor 1422 is less than the third preset threshold, the data reading system 40 can accurately read the data stored on the optical storage medium. In this case, the data reading / writing system 40 may not perform focus servoing. That is, the data reading system 40 does not need to axially adjust the position of the focus of the optical signal focused by the read / write optical head 43.

[0264] When the focus error is equal to the third preset threshold, this embodiment of the present application is not particularly limited.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.This is not limited.

[0265] Optionally, the correspondence between different focusing errors and adjustment amounts for adjusting the position of the axial read / write optical head 43 may be preset in the processor 1422. The correspondence may be predetermined based on a large amount of experimentation. This is not specifically limited.

[0266] If the tracking error determined by the processor 1422 is greater than a fourth preset threshold, the processor 1422 may generate a track servo signal based on the determined adjustment direction and the determined tracking error, where the track servo signal is used to indicate adjusting the position of the radial reflector 46 so as to radially adjust the position of the focal point of the optical signal focused by the read / write optical head 43.

[0267] It should be understood that if the tracking error determined by the processor 1422 is smaller than the fourth preset threshold, the data reading system 40 can accurately read the data stored on the optical storage medium. In this case, the data reading system 40 may not perform tracking servo, that is, the data reading system 40 does not need to radially adjust the position of the focal point of the optical signal focused by the read / write optical head 43.

[0268] When the radial error is equal to the fourth preset threshold, this embodiment of the present application is not particularly limited. 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. This is not limited.

[0269] Optionally, the correspondence between different tracking errors and adjustment amounts for adjusting the position of the radial reflector 46 may be preset in the processor 1422. The correspondence may be predetermined based on a large amount of experimentation. This is not specifically limited.

[0270] The values ​​of the third preset threshold and the fourth preset threshold are not particularly limited in this embodiment of the present application.

[0271] Next, after generating the focus servo signal, the processor 1422 sends the focus servo signal to the second moving platform 143 shown in FIG. 14, and the second moving platform 143 controls the read / write optical head 43 to move axially based on the instruction of the focus servo signal, and adjusts the position of the focus of the optical signal focused by the read / write optical head 43 in the axial direction.

[0272] Next, after generating the track servo signal, the processor 1422 sends the track servo signal to the third moving platform 144 shown in FIG. 14, and the third moving platform 144 controls the reflector 46 to move radially based on the instruction of the track servo signal, and adjusts the focal position of the optical signal focused by the read / write optical head 43 radially.

[0273] It may be understood that the data read / write system 40 typically first performs servoing against the system's focusing error. In this way, when the data read / write system 40 reads the next data point of the current data point, the optical signal used to read the next data point may be focused on the next data point after being focused by the read / write optical head 43. This can eliminate the system's focusing error. Then, the data read / write system 40 performs servoing against the system's tracking error to eliminate the system's tracking error.

[0274] It can be seen that in the data point servo addressing solution used in the embodiment of the present application when reading data, servo addressing is performed by using another data point as a servo point.Compared with the prior art solution that needs to extract the servo light signal used to determine the servo control signal from the data light signal based on frequency information, the solution provided in the embodiment of the present application is more convenient and efficient.

[0275] Thus, it can be understood that when the data read / write system provided in the embodiment of the present application reads data, the data read / write system simply uses an optical deflector to sequentially deflect the first optical signal obtained after modulating the initial optical signal generated by the light source component, and reads a row of data points on the optical storage medium in a preset period. The data read / write system also realizes reading multiple rows of data points on the optical storage medium in the moving direction of the optical storage medium in multiple preset periods by controlling the movement of the optical storage medium. This realizes reading a data band including multiple data channels. That is, the data read / write system provided in the embodiment of the present application reads data on the moving optical storage medium, and simultaneously reads multiple data channels in the data band on the optical storage medium by controlling a single optical signal, that is, reads data in parallel through a single optical signal. Therefore, the embodiment of the present application improves the data reading efficiency of the data read / write system without increasing the rotation speed of the optical storage medium.

[0276] In addition, the data read / write system provided in the embodiment of the present application can perform efficient servo addressing while efficiently reading data, thereby improving data read accuracy.

[0277] It should be noted that the data read / write system 40 shown in FIG. 14 only shows the core components / modules of the data read / write system 40, and the structure shown in FIG. 14 does not constitute a limitation of the data read / write system 40. In addition to the components / modules shown in FIG. 14, the data read / write system 40 may have more or less components / modules than those shown in the figure, or the components / modules may be arranged differently, etc. For example, when the optical deflector of the data read / write system 40 is a rotating mirror, the data read / write system 40 may further include an f-θ mirror. As another example, the data read / write system 40 may further include a connection circuit between the processor 1422 and the first moving platform 45, a connection circuit between the processor 1422 and the second moving platform 143, and a connection circuit between the processor 1422 and the third moving platform 144. Details will not be described again here.

[0278] It should be understood that the above data read / write system 40 is described using an example in which the optical deflector 42 deflects the first optical signal including only a single optical signal. Of course, the optical deflector 42 can also deflect an array optical signal including multiple optical signals to obtain multiple array optical signals, thereby reading / writing one data block. In this way, the array optical signal is sequentially deflected by the optical deflector 42 for multiple preset periods to obtain multiple array optical signals, thereby reading / writing a data band including multiple data blocks. This can further improve the data read / write speed.

[0279] 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. This is not limited. Both j and k are integers greater than 1.

[0280] It should be noted that when the array optical signal is a one-dimensional array optical signal and the one-dimensional array optical signal is input to the optical deflector 42, the plane on which the one-dimensional array optical signal is arranged and the plane on which the optical signal is deflected by the optical deflector 42 have a preset included angle. That is, the plane on which the one-dimensional array optical signal is arranged and the plane on which the optical signal is deflected by the optical deflector 42 are arranged are not in the same plane. In this way, the one-dimensional array optical signal can be deflected by the optical deflector 42 into multiple one-dimensional array optical signals within a preset period to perform reading / writing of a data band including multiple data blocks.

[0281] In this case, the data read / write system 40 may further include an optical device, such as a beam splitter, for splitting the optical signal generated by the light source component into an array optical signal, the details of which will not be described again here.

[0282] 18 is a schematic diagram of a data band including multiple data blocks. As shown in FIG. 18, on a circular optical storage medium, data channel 1, data channel 2, and data channel 3 form a ring data band. Data block 1 is the data points set in data channel 1, data block 2 is the data points set in data channel 2, and data block 3 is the data points set in data channel 3. Multiple data points in a data point set are written simultaneously to the optical storage medium after the array optical signal is deflected by an optical deflector.

[0283] The data read / write method provided in the embodiment of the present application will now be described with reference to the accompanying drawings.

[0284] 19 is a schematic flow chart of a data read / write method according to an embodiment of the present application. The method is applied to the data read / write system 40 shown in FIG. 14. The method may include the following steps.

[0285] S101: A data read / write system generates a first optical signal.

[0286] For a description of the first optical signal, please refer to the related description of the first optical signal, and the details will not be described again here.

[0287] Specifically, for the process of the data reading / writing system generating the first optical signal, please refer to the description of obtaining the first optical signal based on the initial optical signal generated by the light source component 41. The details will not be described again here.

[0288] S102: The data reading / writing system sequentially deflects a first optical signal at a plurality of angles to obtain a plurality of second optical signals.

[0289] Specifically, the data reading / writing system sequentially deflects a first optical signal at multiple angles for a preset period of time to obtain multiple second optical signals.

[0290] For an explanation of the data reading / writing system sequentially deflecting the first optical signal at multiple angles during a preset period to obtain multiple second optical signals, please refer to the explanation of the optical deflector 42 sequentially deflecting the first optical signal at multiple angles to obtain multiple second optical signals, and the details will not be described again here.

[0291] S103: The data read / write system focuses a plurality of second optical signals onto the optical storage medium to realize reading / writing of a plurality of data points, and the data read / write system focuses a plurality of second optical signals corresponding to the preset periods onto the optical storage medium in each of a plurality of preset periods to realize reading / writing of a plurality of data channels.

[0292] The multiple data channels include multiple data points that are read / written by the data read / write system in one preset period, and the multiple data channels correspond one-to-one to the multiple data points.

[0293] For a description of the data read / write system focusing a plurality of second optical signals on an optical storage medium to realize reading / writing of a plurality of data points, and the data read / write system focusing a plurality of second optical signals corresponding to the preset periods on an optical storage medium in each of a plurality of preset periods to read / write a plurality of data channels, please refer to the description of the read / write optical head 43 focusing a plurality of second optical signals on an optical storage medium to read / write a plurality of data points and data channels, and the details will not be described again here.

[0294] Also, when the data read / write system reads data, after the data read / write system controls any one of the plurality of second optical signals to act on the optical storage medium, i.e., after any one of the plurality of optical signals acts on the data point in the optical storage medium, the data point in the optical storage medium may return a third optical signal. In this way, the data read / write system can generate a servo control signal based on the third optical signal. Or, the data read / write system can determine the data to be read based on the third optical signal.

[0295] If any data point is a servo point, the third optical signal is a servo optical signal, that is, the data reading / writing system can generate a servo control signal based on the third optical signal.

[0296] If any data point is used to store data, the third optical signal is a data optical signal, that is, the data reading / writing system can determine the data to be read based on the third optical signal.

[0297] For an explanation of the data read / write system generating a servo control signal based on the third optical signal, and the data read / write system determining the data to be read based on the third optical signal, signalPlease refer to the description of the 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, and the details will not be described again here.

[0298] S104: After the data read / write system completes reading / writing a first data band including multiple data channels on any storage layer of the optical storage medium, the data read / write system moves an optical deflector and a read / write optical head in the data read / write system a preset distance on a plane perpendicular to an axial direction of the read / write optical head, and performs reading / writing of a second data band on any storage layer.

[0299] For an explanation of the data read / write system moving the optical deflector and the read / write optical head of the data read / write system by a preset distance in a plane perpendicular to the axial direction of the read / write optical head to read / write a second data band on any storage layer of the optical storage medium after completing the reading / writing of a first data band including multiple data channels on any storage layer of the optical storage medium, please refer to the explanation of the data read / write system moving the optical deflector and the read / write optical head using the radial movement station 91 to read / write a different data band, the details of which will not be described again here.

[0300] In conclusion, the present application provides a data read / write system and method, which uses an optical deflector to sequentially deflect a first optical signal obtained after modulating an initial optical signal generated by a light source component, to implement reading / writing a row of data points on an optical storage medium in a preset period. The data read / write system also controls the movement of the optical storage medium to realize reading / writing a plurality of rows of data points on the optical storage medium in a plurality of preset periods in the direction of movement of the optical storage medium, thereby realizing reading / writing a data band including a plurality of data channels. That is, the data read / write system provided in the present application reads / writes data on the moving optical storage medium, and simultaneously reads / writes a plurality of data channels in a data band on the optical storage medium by controlling a single optical signal, that is, reads / writes data in parallel through a single optical signal. Thus, the present application improves the data read / write efficiency of the data read / write system without increasing the rotation speed of the optical storage medium.

[0301] In addition, the data read / write system provided in the embodiment of the present application can perform efficient servo addressing while efficiently reading data, thereby improving data read accuracy.

[0302] In order to more clearly illustrate the beneficial effects of the data read / write system provided in the embodiment of the present application, a practical application example is given below.

[0303] The initial optical signal generated by the light source component is a single optical signal, the optical deflector is an acousto-optical deflector, and the frequency of the deflected optical signal is 300 kHz. For example, the scanning range of the read / write optical head (the position range of the optical signal obtained by deflection by the optical deflector and focused on the optical storage medium by the read / write optical head) is 300 μm, and the diameter of a single bit (i.e., one data point (one data point represents one bit)) is 200 nm. The read / write bandwidth that can be realized by the data read / write system provided in the embodiment of the present application is 300 kHz × 300 μm ÷ 200 nm / bit = 56.25 MB / s.

[0304] In this case, for example, the optical storage medium is a circular optical disk, and the optical disk is rotated using a first moving platform. If the channel spacing between two adjacent data channels on the optical disk (i.e. the distance between the centers of two parallel data points on the two data channels) is 400 nm. Therefore, the linear velocity of the first moving platform used to rotate the optical disk is only v = 300 kHz x 400 nm = 120 mm / s.

[0305] In this case, calculate the rotation speed n based on the following formula:

number

number

number

[0306] The above description is merely a specific implementation of the present invention, and is not intended to limit the protection scope of the present invention. Any variation or replacement that is readily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be encompassed within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. 1. A data read / write system, comprising: an optical deflector configured to sequentially deflect the first optical signal through a plurality of angles to obtain a plurality of second optical signals; a read / write optical head configured to receive the second optical signals and separately focus the second optical signals onto an optical storage medium to read / write a plurality of data points; Including, The read / write optical head writes the servo points to the optical storage medium such that the plurality of data points form a data channel, the plurality of data channels form a data band, the one data band includes at least one servo channel, the plurality of servo points on the servo channel are discretely distributed, the optical storage medium includes a plurality of storage layers, the servo points of the plurality of storage layers are discretely distributed in an axial direction of the read / write optical head, and the servo points of at least some of the plurality of storage layers do not overlap in the axial direction of the read / write optical head.

2. The system comprises: a moving platform configured to receive the optical storage medium and configured to control the optical storage medium to rotate or translate in a plane perpendicular to an axial direction of the read / write optical head; the optical deflector is configured to sequentially deflect the first optical signal by the plurality of angles during each of a plurality of preset periods to obtain the plurality of second optical signals; 2. The system of claim 1, wherein the read / write optical head is further configured to receive the second optical signals at preset time intervals and focus the second optical signals separately onto the optical storage medium to read / write a plurality of data channels, the plurality of data channels having a one-to-one correspondence with the plurality of data points.

3. The system of claim 2 , wherein the optical deflector comprises at least one of the following devices: a multi-faceted rotating mirror, an oscillating mirror, an acousto-optical deflector, or an electro-optical deflector.

4. A system as described in any one of claims 1 to 3, wherein the read / write optical head further writes the servo points to the optical storage medium such that the distance between any two adjacent servo points of the plurality of servo points is greater than or equal to a predetermined distance.

5. The system further comprises: a radial movement station configured to, after completing reading / writing a first data band in a first storage layer of the plurality of storage layers of the optical storage medium, move the optical deflector and the read / write optical head a preset distance in a plane perpendicular to an axial direction of the read / write optical head to read / write a second data band in the first storage layer, the first storage layer including a plurality of data bands; The system according to any one of claims 1 to 4, comprising:

6. The system further comprises: A signal processing module, comprising: configured to receive a third optical signal during data reading, the third optical signal being an optical signal returned by the optical storage medium after any of the plurality of second optical signals has acted on a data point on the optical storage medium, and further configured to determine whether the third optical signal is a servo optical signal or a data optical signal depending on whether a period during which the third optical signal is received corresponds to a period used by the read / write optical head to store data or to write servo points; configured to generate a servo control signal based on the third optical signal when the third optical signal is the servo optical signal, the servo control signal being configured to adjust a position of a focus of an optical signal focused by the read / write optical head such that one or more of a shape, size, and intensity of an optical spot of the third optical signal approaches a corresponding one or more of a preset shape, size, and intensity of an optical spot of the servo point, or configured to determine data to be read based on one or more of a shape, size, and intensity of an optical spot of the third optical signal when the third optical signal is the data optical signal; A system as described in any one of claims 1 to 5, wherein if any data point is a servo point, the third optical signal is the servo optical signal, or if any data point is configured to store data, the third optical signal is the data optical signal.

7. The system further comprises: a light source component configured to obtain the first light signal; The system according to any one of claims 1 to 6, further comprising:

8. 1. A method for reading / writing data, applied to a data reading / writing system, the method comprising: sequentially deflecting the first optical signal through a plurality of angles to obtain a plurality of second optical signals; focusing the second optical signals onto an optical storage medium to read / write a plurality of data points; Including, The method, wherein performing writing of a plurality of data points includes writing the servo points to the optical storage medium such that the plurality of data points form a data channel, the plurality of data channels form a data band, the one data band includes at least one servo channel, a plurality of servo points on the servo channel are discretely distributed, the optical storage medium includes a plurality of storage layers, the servo points of the plurality of storage layers are discretely distributed in an axial direction of a read / write optical head of the data reading / writing system, and the servo points of at least some of the plurality of storage layers do not overlap in the axial direction of the read / write optical head.

9. The method comprises: controlling the optical storage medium to rotate or translate in a plane perpendicular to an axial direction of the read / write optical head of the read / write system; The step of sequentially deflecting the first optical signal at a plurality of angles to obtain a plurality of second optical signals includes: sequentially deflecting the first optical signal through the plurality of angles during each of a plurality of preset periods to obtain the plurality of second optical signals; The method comprises: focusing the second optical signals on the optical storage medium for each preset time period to read / write a plurality of data channels, the plurality of data channels having a one-to-one correspondence with the plurality of data points; The method of claim 8 further comprising:

10. The step of sequentially deflecting the first optical signal at a plurality of angles to obtain a plurality of second optical signals includes:

10. The method of claim 9, comprising sequentially deflecting the first optical signal at the plurality of angles to obtain the plurality of second optical signals by an optical deflector of the data reading / writing system, the optical deflector comprising at least one of the following devices: a multi-faceted rotating mirror, an oscillating mirror, an acousto-optical deflector, or an electro-optical deflector.

11. The method of claim 10, wherein writing a plurality of data points further comprises writing the servo points to the optical storage medium such that a distance between any two adjacent servo points of the plurality of servo points is greater than or equal to a predetermined distance.

12. The method according to claim 1, 12. The method of claim 10, further comprising the step of: after completing a read / write operation for a first data band in a first storage layer of the plurality of storage layers of the optical storage medium, moving the optical deflector and the read / write optical head of the data read / write system a preset distance in a plane perpendicular to an axial direction of the read / write optical head to read / write a second data band in the first storage layer, the first storage layer including a plurality of data bands.

13. The method comprises: determining whether the third optical signal is a servo optical signal or a data optical signal according to whether a period during which the third optical signal is received corresponds to a period used to store data or a period used to write servo points by the read / write optical head; generating a servo control signal based on the third optical signal when the third optical signal is the servo optical signal, the servo control signal being configured to adjust a position of a focus of an optical signal focused by the read / write optical head in the data reading / writing system such that one or more of a shape, size, and intensity of an optical spot of the third optical signal approaches a corresponding one or more of a preset shape, size, and intensity of an optical spot of the servo point; or determining data to be read based on one or more of a shape, size, and intensity of an optical spot of the third optical signal when the third optical signal is the data optical signal; the third optical signal being an optical signal returned by the optical storage medium after any of the plurality of second optical signals has acted on any data point on the optical storage medium; A method according to any one of claims 8 to 12, wherein if any data point is a servo point, the third optical signal is the servo optical signal, or if any data point is configured to store data, the third optical signal is the data optical signal.

14. Prior to sequentially deflecting the first optical signal through a plurality of angles to obtain a plurality of second optical signals, the method further comprises: The method of any one of claims 8 to 13, further comprising the step of generating the first optical signal.

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