Super-multilayer optical storage read-write and servo device and method based on liquid lens

Abstract

The invention discloses a super-multilayer optical storage read-write and servo device and method based on a liquid lens. The super-multilayer optical storage read-write and servo device comprises a read-write module, a liquid objective lens, a liquid collimating lens, a servo module and an optical storage medium with an independent servo guide layer. The optical system is used for adjusting the focal length of the liquid objective lens and the focal length of the liquid collimating lens, so that writing or reading light beams emitted by the read-write module can be converged to different recording layers of the optical storage medium through the liquid objective lens, and data writing or reading of the optical storage medium is carried out. Servo light beams emitted by the servo module pass through the liquid collimating mirror and the liquid objective lens and then can be always converged on the independent servo guide layer of the optical storage medium. The liquid objective lens and the liquid collimating lens are arranged, and the focal lengths of the liquid objective lens and the liquid collimating lens are regulated and controlled by external voltage, so that modulation at extremely high response frequency can be realized, the device has the advantage of high response speed, and a servo light beam can be always focused on the surface of the independent servo guide layer under the condition that the thickness of an optical storage medium is not uniform.

Description

Technical Field

[0001] The present invention relates to the field of optical storage technology, and in particular to a liquid lens-based ultra-multi-layer optical storage read-write and servo device and method. Background Art

[0002] At present, the large-capacity optical storage media on the market, such as optical discs, generally do not exceed 8 layers on both sides. Each layer is equipped with a radial periodic groove structure pre-pressed by the master disc as a servo guide layer, and a recording layer is plated on the guide layer for recording data. The layers are stacked in sequence by laminating. This method can still be realized under the current optical storage medium structure with fewer layers and larger interlayer spacing. However, future optical storage technology requires a significant increase in the data storage density of optical storage media. The storage density is affected by the minimum storage unit size and the number of optical storage medium layers. The minimum unit size is difficult to continue to compress due to the optical diffraction limit. Therefore, increasing the number of recording layers of optical storage media has become an effective means to increase the optical storage capacity. However, when the number of layers increases and the interlayer spacing decreases, the original method of pressing tracks layer by layer and laminating is not easy to implement in terms of technology. Therefore, consider an optical storage medium structure with only a single-layer servo guide layer and multiple recording layers. Each recording layer is no longer equipped with a separate servo guide layer, but all recording layers share an independent servo guide layer. This is feasible in terms of technology, but it puts forward new requirements for the read-write and servo optical system.

[0003] For example, it is difficult to ensure that the upper and lower surfaces of an optical storage medium are completely parallel after actual manufacturing, that is, the thickness of the optical storage medium may vary with the spatial position, such as Figure 1 As shown, this situation has no effect on the current optical storage medium in which each recording layer is equipped with a servo guide layer, because the two functional layers are bound together, and the servo system can normally complete the servo work regardless of the relative position thickness of each point. However, for the ultra-multi-layer optical storage medium structure with independent servo guide layers mentioned above, the servo layer and the recording layer are separated, and the thickness change of the optical storage medium will affect the focusing servo accuracy. In practice, for the above problem, the servo light path collimator can be moved back and forth to adjust the overall focal length of the servo light path to ensure that the servo beam is always focused on the servo guide layer. However, in the case of high-speed rotation or high-speed translation of the optical storage medium, it is difficult for the mechanical structure that drives the collimator to move back and forth to ensure the movement frequency and movement accuracy, resulting in inaccurate servo action, affecting the final data reading and writing accuracy. Summary of the invention

[0004] The present invention provides a super-multi-layer optical storage read-write and servo device and method based on liquid lens, so as to overcome the technical problem that when an independent servo guide layer is used in the prior art, the servo action is inaccurate due to the thickness change of the optical storage medium, thereby affecting the final data read-write accuracy.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] A super-multi-layer optical storage read-write and servo device based on a liquid lens, connected to an optical system, comprising: a read-write module, a liquid objective lens, a liquid collimating lens, a servo module and an optical storage medium with an independent servo guide layer;

[0007] The optical system is used to adjust the focal lengths of the liquid objective lens and the liquid collimating lens respectively, so that the write or read light beam emitted by the read-write module can be converged to different recording layers of the optical storage medium through the liquid objective lens to write or read data from the optical storage medium. At the same time, the servo light beam emitted by the servo module can always be converged on the independent servo guide layer of the optical storage medium after passing through the liquid collimating lens and the liquid objective lens.

[0008] Further, the read-write module includes a read-write laser, a first half-reflecting half-mirror, a second half-reflecting half-mirror, a read-converging mirror and a read-detector;

[0009] When writing data to the optical storage medium, the first half-reflecting half-mirror is used to reflect the writing light beam emitted by the read-write laser to the second half-reflecting half-mirror, and the second half-reflecting half-mirror is used to reflect the incident light to the liquid objective lens, and the incident light is focused to the to-be-recorded layer in the recording layer of the optical storage medium by adjusting the focal length of the liquid objective lens to write data;

[0010] When reading data from an optical storage medium, the first semi-reflecting half-mirror is used to reflect the reading light beam emitted by the read-write laser to the second semi-reflecting half-mirror, the second semi-reflecting half-mirror is used to reflect the incident light to the liquid objective lens, and the incident light is converged to the recorded layer in the recording layer of the optical storage medium by adjusting the focal length of the liquid objective lens. The recorded layer reflects the incident light to the liquid objective lens, and the liquid objective lens is used to transmit the incident light to the second semi-reflecting half-mirror, the second semi-reflecting half-mirror is used to reflect the incident light to the first semi-reflecting half-mirror, the first semi-reflecting half-mirror is used to transmit the incident light to a reading converging mirror, and the reading converging mirror is used to converge the incident light onto a reading detector, and data from the optical storage medium is read through the reading detector.

[0011] Further, the servo module includes a servo laser and a third semi-reflective semi-mirror lens;

[0012] The third semi-reflective and semi-mirror lens is used to transmit the servo light beam emitted by the servo laser to the liquid collimating lens; by adjusting the focal length of the liquid collimating lens, the incident light is collimated and transmitted to the second semi-reflective and semi-mirror lens, and the second semi-reflective and semi-mirror lens is used to transmit the incident light to the liquid objective lens, and by adjusting the focal length of the liquid objective lens, the incident light is focused onto the independent servo guide layer of the optical storage medium.

[0013] Furthermore, the servo module further comprises a fourth semi-reflective semi-mirror, a tracking detector and a focus monitoring device;

[0014] The liquid objective lens is used to transmit the light reflected by the independent servo guide layer to the second half-reflecting half-mirror, the second half-reflecting half-mirror is used to transmit the incident light to the liquid collimating lens, the liquid collimating lens is used to transmit the incident light to the third half-reflecting half-mirror, the third half-reflecting half-mirror is used to reflect the incident light to the fourth half-reflecting half-mirror, the fourth half-reflecting half-mirror is used to reflect the incident light to the tracking detector and transmit it to the focus monitoring device respectively;

[0015] The tracking detector monitors the transverse focusing position of the servo light beam emitted by the servo laser on the optical storage medium according to the incident light, and transmits the monitoring result to the optical system. The optical system determines whether there is a tracking deviation in the transverse focusing position of the servo light beam on the optical storage medium according to the monitoring result of the tracking detector. If there is, the tracking deviation is corrected by adjusting the transverse position of the liquid objective lens.

[0016] The focusing monitoring device monitors the longitudinal focusing position of the servo light beam emitted by the servo laser on the optical storage medium according to the incident light, and transmits it to the optical system. The optical system determines whether the servo light beam is focused on the independent servo guide layer according to the monitoring result of the focusing monitoring device. If it is not focused, the focusing deviation is corrected by adjusting the focal length of the liquid objective lens.

[0017] Further, the focus monitoring device includes a pinhole plate and a focus detector;

[0018] The light transmitted by the fourth semi-reflective and semi-mirror lens passes through the pinhole on the pinhole plate and then converges on the focusing detector.

[0019] Further, the focus monitoring device includes a cylindrical lens and a four-quadrant detector;

[0020] The light transmitted by the fourth semi-reflective and semi-mirror lens passes through the cylindrical lens and converges on the four-quadrant detector.

[0021] A method for reading, writing and servoing super-multi-layer optical storage based on a liquid lens, and a super-multi-layer optical storage reading, writing and servoing device based on the liquid lens are implemented, specifically including two steps of writing data to an optical storage medium and reading data from the optical storage medium, wherein:

[0022] 1) When writing data to the optical storage medium, the read / write module emits a write light beam with a wavelength of λ1, and the servo module emits a servo light beam with a wavelength of λ2;

[0023] The focal length is adjusted by adjusting the loading voltage of the liquid objective lens and the liquid collimator lens through the optical system, so that the writing light beam is converged to the to-be-recorded layer of the optical storage medium through the liquid objective lens to write data, and at the same time, the servo light beam emitted by the servo module is always converged to the independent servo guide layer of the optical storage medium after passing through the liquid collimator lens and the liquid objective lens;

[0024] 2) When reading data from the optical storage medium, the read / write module emits a read light beam with a wavelength of λ1, and the servo module emits a servo light beam with a wavelength of λ2;

[0025] The focal length is adjusted by adjusting the loading voltage of the liquid objective lens and the liquid collimating lens through the optical system, so that the reading light beam is converged to the recorded layer of the optical storage medium through the liquid objective lens for data reading. At the same time, the servo light beam emitted by the servo module is always converged to the independent servo guide layer of the optical storage medium after passing through the liquid collimating lens and the liquid objective lens.

[0026] Furthermore, the process of adjusting the loading voltage of the liquid objective lens through the optical system includes:

[0027] The longitudinal focusing position of the servo light beam on the optical storage medium is monitored by a focusing monitoring device and transmitted to the optical system. The optical system determines whether the servo light beam is focused on the independent servo guide layer according to the monitoring result of the focusing monitoring device. If it is not focused, the loading voltage of the liquid objective lens is adjusted to adjust the focal length to correct the focusing deviation.

[0028] Beneficial effect: The present invention is provided with a liquid objective lens and a liquid collimator lens, so that in the optical storage reading and writing and servo process, by adjusting the focal length of the liquid objective lens and the liquid collimator lens in real time, the writing or reading light beam emitted by the reading and writing module can be converged to different recording layers of the optical storage medium under the condition of uneven thickness of the optical storage medium, so as to write or read data of the optical storage medium, and at the same time, the servo light beam emitted by the servo module can always be converged on the independent servo guide layer of the optical storage medium. At the same time, since the focal length of the liquid collimator lens and the liquid objective lens is regulated by an external voltage, it can be modulated at an extremely high response frequency, and has the advantage of fast response speed, and since the liquid collimator lens itself does not need to move, there is no problem of repeated movement affecting positioning accuracy existing in the prior art, thereby ensuring that the servo light beam can always be focused on the surface of the independent servo guide layer even when the thickness of the optical storage medium is uneven. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 It is a first structural schematic diagram of a super-multi-layer optical storage read-write and servo device based on a liquid lens in the present invention;

[0031] Figure 2 It is a second structural schematic diagram of a super-multi-layer optical storage read-write and servo device based on a liquid lens in the present invention;

[0032] Figure 3 It is a third structural schematic diagram of a super-multi-layer optical storage read-write and servo device based on liquid lens in the present invention;

[0033] Figure 4 is a schematic diagram of the structure of the optical storage medium in the present invention;

[0034] Figure 5 Schematic diagram of the structure of the liquid objective lens in the present invention;

[0035] Figure 6 Schematic diagram of the working state of the liquid objective lens under different voltages in an embodiment of the present invention;

[0036] Figure 7 Schematic diagram of the working states of the liquid objective lens and the liquid collimating lens under different voltages in an embodiment of the present invention;

[0037] Figure 8 It is a schematic structural diagram of a liquid objective lens, a liquid collimating lens and an optical storage medium when learning the voltage across the liquid collimating lens in an embodiment of the present invention;

[0038] Fig. 9 is a schematic diagram of an optical path when there is no longitudinal focus deviation in an embodiment of the present invention;

[0039] Fig.10 is a schematic diagram of a light spot formed when there is no longitudinal focus deviation in an embodiment of the present invention;

[0040] Fig.11 is a schematic diagram of an optical path when there is a longitudinal focus deviation in an embodiment of the present invention;

[0041] Fig.12 FIG. 1 is a schematic diagram of a light spot formed when there is a longitudinal focus deviation in an embodiment of the present invention.

[0042] In the figure: 1. read-write module; 11. read-write laser; 12. first half-reflective half-mirror; 13. second half-reflective half-mirror; 14. read-convergence mirror; 15. read-detector; 2. liquid objective lens; 21. encapsulation glass; 22. electrode; 23. conductive liquid; 24. liquid interface; 25. insulating liquid; 3. liquid collimator; 4. servo module; 41. servo laser; 42. third half-reflective half-mirror; 43. fourth half-reflective half-mirror; 44. tracking detector; 45. focus monitoring device; 451. pinhole plate; 452. focus detector; 453. cylindrical lens; 454. four-quadrant detector; 5. optical storage medium; 51. recording layer; 52. independent servo guide layer. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] This embodiment provides a super-multilayer optical storage read-write and servo device based on a liquid lens, which is connected to an optical system, such as Figures 1 to 3 As shown, it includes: a read-write module 1, a liquid objective lens 2, a liquid collimating lens 3, a servo module 4 and Figure 4 The optical storage medium 5 having an independent servo guide layer is shown;

[0045] The optical system is used to adjust the focal lengths of the liquid objective lens 2 and the liquid collimating lens 3 respectively, so that the writing or reading light beam emitted by the read-write module 1 can be converged to different recording layers 51 of the optical storage medium 5 through the liquid objective lens 2 to write or read data from the optical storage medium. At the same time, the servo light beam emitted by the servo module 4 can always be converged on the independent servo guide layer 52 of the optical storage medium after passing through the liquid collimating lens 3 and the liquid objective lens 2.

[0046] Specifically, the liquid objective lens 2 is a liquid lens, and its structure is as follows: Figure 5As shown, it includes packaging glass 21, electrodes 22 and two liquid substances with the same density, different refractive index and immiscible with each other, one of which is a conductive liquid 23 and the other is an insulating liquid 25. By applying voltage across the conductive liquid, the electrowetting effect of the interface 24 of the two liquids can be changed, so that the radius of curvature of the liquid interface 24 changes, thereby changing the focal length of the liquid objective lens 2. When reading and writing data on different recording layers inside the optical storage medium, the focal length of the liquid objective lens 2 is changed to focus the read and write light spot on different recording layers of the optical storage medium to achieve data writing or reading, as shown in FIG. Figure 6 As shown, U b1 , U b2 , U b3 Represents three different voltage values ​​loaded on both ends of the liquid objective lens.

[0047] Specifically, in this embodiment, the working principle of the liquid collimator 3 is consistent with that of the liquid objective lens 2. Similarly, the focal length of the liquid collimator 3 can be changed by changing the applied voltage of the liquid collimator 3, thereby ensuring that the servo light beam is always focused on the independent servo guide layer. Specifically, when the liquid objective lens 2 changes its own focal length to focus the read-write light beam on different recording layers inside the optical storage medium, the liquid collimator also changes its own focal length synchronously, so that the servo light beam focused on the independent servo guide layer at the bottom of the optical storage medium is always kept in the focusing state of the independent servo guide layer, such as Figure 7 As shown, U a1 , U a2 , U a3 Indicates three different voltage values ​​loaded on both ends of the liquid collimator mirror corresponding to maintaining the focusing position of the servo beam.

[0048] Specifically, since the focal lengths of the liquid collimator and the liquid objective lens are regulated by an external voltage, they can be modulated at an extremely high response frequency. And since the liquid collimator itself does not need to move, there is no problem of repeated movement affecting positioning accuracy that exists in the prior art, thereby ensuring that the servo light beam can always be focused on the surface of the independent servo guide layer even when the thickness of the optical storage medium is uneven.

[0049] In a specific embodiment, the read-write module 1 includes a read-write laser 11, a first semi-reflective mirror 12, a second semi-reflective mirror 13, a read-converging mirror 14 and a read-detector 15;

[0050] When writing data to the optical storage medium, the first half-reflecting half-mirror 12 is used to reflect the writing light beam emitted by the read-write laser 11 to the second half-reflecting half-mirror 13, and the second half-reflecting half-mirror 13 is used to reflect the incident light to the liquid objective lens 2, and the incident light is focused to the to-be-recorded layer in the recording layer of the optical storage medium by adjusting the focal length of the liquid objective lens 2, so as to write data;

[0051] When reading data from an optical storage medium, the first semi-reflective mirror 12 is used to reflect the reading light beam emitted by the read / write laser 11 to the second semi-reflective mirror 13, and the second semi-reflective mirror 13 is used to reflect the incident light to the liquid objective lens 2. By adjusting the focal length of the liquid objective lens 2, the incident light is converged to the recorded layer in the recording layer of the optical storage medium. The recorded layer reflects the incident light to the liquid objective lens 2, and the liquid objective lens 2 is used to transmit the incident light to the second semi-reflective mirror 13. The second semi-reflective mirror 13 is used to reflect the incident light to the first semi-reflective mirror 12. The first semi-reflective mirror 12 is used to transmit the incident light to the reading converging mirror 14. The reading converging mirror 14 is used to converge the incident light onto the reading detector 15, and the data of the optical storage medium is read through the reading detector 15.

[0052] In a specific embodiment, the servo module 4 includes a servo laser 41 and a third semi-reflective half-mirror 42; the third semi-reflective half-mirror 42 is used to transmit the servo light beam emitted by the servo laser 41 to the liquid collimator 3; by adjusting the focal length of the liquid collimator 3, the incident light is collimated into parallel light or small-angle non-parallel light and transmitted to the second semi-reflective half-mirror 13, and the second semi-reflective half-mirror 13 is used to transmit the incident light to the liquid objective lens 2. Since the liquid objective lens has a dispersion effect, the incident light is converged to the independent servo guide layer of the optical storage medium 5 by adjusting the focal length of the liquid objective lens 2.

[0053] In a specific embodiment, the servo module 4 further includes a fourth semi-reflective mirror 43, a tracking detector 44 and a focus monitoring device 45;

[0054] The liquid objective lens 2 is used to transmit the light reflected by the independent servo guide layer to the second semi-reflective mirror 13, the second semi-reflective mirror 13 is used to transmit the incident light to the liquid collimating mirror 3, the liquid collimating mirror 3 is used to transmit the incident light to the third semi-reflective mirror 42, the third semi-reflective mirror 42 is used to reflect the incident light to the fourth semi-reflective mirror 43, the fourth semi-reflective mirror 43 is used to reflect the incident light to the tracking detector 44 and transmit it to the focusing monitoring device 45 respectively;

[0055] Specifically, the tracking detector 44 monitors the transverse focus position of the servo light beam emitted by the servo laser on the optical storage medium according to the incident light, and transmits it to the optical system. The optical system determines whether there is a tracking deviation in the transverse focus position of the servo light beam on the optical storage medium according to the monitoring result of the tracking detector. If there is, the tracking deviation is corrected by adjusting the transverse position of the liquid objective lens 2.

[0056] The focusing monitoring device 45 monitors the longitudinal focusing position of the servo light beam emitted by the servo laser on the optical storage medium according to the incident light, and transmits it to the optical system. The optical system determines whether the servo light beam is focused on the independent servo guide layer according to the monitoring result of the focusing monitoring device. If it is not focused, the focusing deviation is corrected by adjusting the focal length of the liquid objective lens 2.

[0057] Specifically, in this embodiment, in order to ensure the smooth progress of the reading, writing and servo processes, the reading and writing light beams and the servo light beams need to strictly maintain the center beam combination before entering the liquid objective lens.

[0058] In a specific embodiment, the focus monitoring device 45 includes a pinhole plate 451 and a focus detector 452;

[0059] The light transmitted by the fourth semi-reflective mirror 43 passes through the pinhole on the pinhole plate 451 and then converges on the focusing detector 452 .

[0060] Specifically, in this embodiment, the pinhole plate 451 is made of a light-shielding material, and an extremely small pinhole is provided at the center position. The optical path from the pinhole to the liquid collimator 3 is equal to the optical path from the servo laser light point to the liquid collimator 3. The reversible principle of the optical path is applied to obtain the spot state formed by the servo light beam through the focusing detector 452 and transmit it to the optical system.

[0061] Specifically, if the optical storage medium has no deviation in the longitudinal focusing position of the read / write beam on the optical storage medium when the optical storage medium moves at a high speed, that is, the optical storage medium is not defocused, then the servo beam is focused on the pinhole of the pinhole plate 451 after being reflected by the independent servo guide layer, and most of the light energy can pass through the pinhole to form a larger bright spot on the focusing detector 452, such as Fig. 9 and Fig.10 As shown; if the optical storage medium is moving at a high speed, the longitudinal focusing position of the read / write beam on the optical storage medium deviates, that is, the optical storage medium is out of focus, indicating that the focal length of the liquid objective lens is not appropriate at this time, and the servo beam will not be focused at the pinhole after being reflected by the independent servo guide layer. As a result, only a small part of the light energy can pass through the pinhole, forming a small dark spot on the focusing detector 452, as shown in FIG. Fig.11 and Fig.12 The focusing detector 452 determines the state of the light spot incident thereon and feeds back to the optical system. The optical system adjusts the focal length of the liquid objective lens 2 in real time according to the monitoring result of the focusing detector, so that the servo beam is always focused on the independent servo guide layer, and the read-write beam is also always focused on the location of the recording layer.

[0062] In a specific embodiment, the focus monitoring device 45 includes a cylindrical lens 453 and a four-quadrant detector 454;

[0063] The light transmitted by the fourth semi-reflective mirror 43 passes through the cylindrical lens 453 and converges on the four-quadrant detector 454 .

[0064] Specifically, the optical system can determine whether the servo beam is focused on the independent servo guide layer according to the sign of the final calculation result of the four-quadrant detector 454, so that the servo beam is always focused on the independent servo guide layer, and then the read-write beam will always be focused on the location of the recording layer.

[0065] Specifically, the following corresponding relationship exists in this embodiment, that is, if the servo beam is focused on the independent servo guide layer, then the read-write beam must also be focused on the recording layer. Therefore, by monitoring the servo beam, it is possible to know whether there is a deviation in the read-write beam, and by adjusting the liquid objective lens to correct the deviation, thereby ensuring the smooth progress of the read-write process.

[0066] In this embodiment, a method for ultra-multi-layer optical storage reading, writing and servo based on a liquid lens is also proposed, which is implemented based on an ultra-multi-layer optical storage reading, writing and servo device, and specifically includes two steps of writing data to an optical storage medium and reading data from an optical storage medium, wherein:

[0067] 1) When writing data to an optical storage medium, the read / write module emits a high-intensity writing light beam with a wavelength of λ1, and the servo module emits a servo light beam with a wavelength of λ2; the loading voltage of the liquid objective lens and the liquid collimating lens is adjusted through the optical system to thereby adjust the focal length, so that the high-intensity writing light beam is converged to the to-be-recorded layer of the optical storage medium through the liquid objective lens to write data, and at the same time, the servo light beam emitted by the servo module is always converged to the independent servo guide layer of the optical storage medium after passing through the liquid collimating lens and the liquid objective lens;

[0068] 2) When reading data from an optical storage medium, the read / write module emits a low-intensity reading light beam with a wavelength of λ1, and the servo module emits a servo light beam with a wavelength of λ2; the loading voltage of the liquid objective lens and the liquid collimating lens is adjusted through the optical system to thereby adjust the focal length, so that the low-intensity reading light beam is converged to the recorded layer of the optical storage medium through the liquid objective lens for data reading, and at the same time, the servo light beam emitted by the servo module is always converged to the independent servo guide layer of the optical storage medium after passing through the liquid collimating lens and the liquid objective lens.

[0069] Specifically, during the data reading and writing process, when different recording layers need to be changed, the focal lengths of the liquid objective lens 2 and the liquid collimating lens 3 are changed simultaneously, so that the read and write light beams are focused on different recording layers of the optical storage medium under the focusing action of the liquid objective lenses with different focal lengths, while the servo light beam is always focused on the independent servo guide layer at the bottom of the optical storage medium under the joint zooming action of the liquid collimating lens and the liquid objective lens.

[0070] Specifically, in this embodiment, a voltage learning step for both ends of the liquid collimator is also provided, such as Figure 8 As shown, first, the optical storage medium is loaded to the specified position, voltage is applied to the liquid collimator and the liquid objective lens, the focal position of the liquid objective lens 2 is adjusted to the independent servo guide layer 52 of the optical storage medium, and the servo laser is turned on at the same time to focus the servo light beam on the independent servo guide layer 52, then the optical storage medium is rotated or linearly moved according to the type of the optical storage medium, and the voltage at both ends of the liquid collimator is adjusted according to the feedback result of the focusing detector to change its focal length so that the focus point of the servo light beam is always located on the surface of the independent servo guide layer, and at the same time, the voltage value at both ends of the liquid collimator when the optical storage medium moves is recorded and learned through the memory of the optical system, and finally the voltage value at both ends of the liquid collimator corresponding to the change in thickness of the optical storage medium is obtained. This operation enables the optical system to adjust the voltage value at both ends of the liquid collimator more quickly to change its focal length so that the servo light beam is focused on the independent servo guide layer when actually reading and writing data in the subsequent actual reading and writing of data.

[0071] In a specific embodiment, when writing data to an optical storage medium, the process of focusing the high-intensity writing light beam on the to-be-recorded layer of the optical storage medium through the liquid objective lens to write data is as follows:

[0072] The first half-reflecting half-mirror reflects the high-intensity writing light beam with a wavelength of λ1 emitted by the read-write laser to the second half-reflecting half-mirror, and the second half-reflecting half-mirror reflects the incident light to the liquid objective lens, and the liquid objective lens converges the incident light to the to-be-recorded layer of the optical storage medium to write data;

[0073] When reading data from an optical storage medium, the process in which the low-intensity reading light beam is focused on the recorded layer of the optical storage medium through the liquid objective lens to read data is as follows:

[0074] The first semi-reflective half-mirror is used to reflect the low-intensity reading light beam with a wavelength of λ2 emitted by the read-write laser to the second semi-reflective half-mirror, the second semi-reflective half-mirror reflects the incident light to the liquid objective lens, the liquid objective lens converges the incident light to the recorded layer of the optical storage medium, the recorded layer reflects the incident light to the liquid objective lens, the liquid objective lens transmits the incident light to the second semi-reflective half-mirror, the second semi-reflective half-mirror reflects the incident light to the first semi-reflective half-mirror, the first semi-reflective half-mirror transmits the incident light to the reading converging mirror, the reading converging mirror converges the incident light onto the reading detector, and the data of the optical storage medium is read through the reading detector.

[0075] In a specific embodiment, the process in which the servo light beam emitted by the servo module passes through a liquid collimating lens and a liquid objective lens and converges on an independent servo guide layer of the optical storage medium is as follows:

[0076] The third semi-reflective half-mirror transmits the servo light beam emitted by the servo laser to the liquid collimating mirror; the liquid collimating mirror collimates the incident light and transmits it to the second semi-reflective half-mirror, the second semi-reflective half-mirror transmits the incident light to the liquid objective lens, and the liquid objective lens converges the incident light to the independent servo guide layer of the optical storage medium.

[0077] In a specific embodiment, the process of adjusting the loading voltage of the liquid objective lens by the optical system includes:

[0078] The longitudinal focusing position of the servo light beam on the optical storage medium is monitored by a focusing monitoring device and transmitted to the optical system. The optical system determines whether the servo light beam is focused on the independent servo guide layer according to the monitoring result of the focusing monitoring device. If it is not focused, the loading voltage of the liquid objective lens is adjusted to adjust the focal length to correct the focusing deviation.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A super-multi-layer optical storage read-write and servo device based on a liquid lens, connected to an optical system, characterized in that: include: A read / write module (1), a liquid objective lens (2), a liquid collimating lens (3), a servo module (4), and an optical storage medium (5) having an independent servo guide layer; The optical system is used to adjust the focal lengths of the liquid objective lens (2) and the liquid collimator lens (3) respectively, so that the writing or reading light beam emitted by the read-write module (1) can be converged to different recording layers (51) of the optical storage medium (5) through the liquid objective lens (2) to write or read data from the optical storage medium, and at the same time, the servo light beam emitted by the servo module (4) can always be converged to the independent servo guide layer (52) of the optical storage medium after passing through the liquid collimator lens (3) and the liquid objective lens (2).

2. The liquid lens-based ultra-multi-layer optical storage read-write and servo device according to claim 1, characterized in that: The read-write module (1) comprises a read-write laser (11), a first semi-reflective semi-mirror (12), a second semi-reflective semi-mirror (13), a read-converging mirror (14) and a read-detector (15); When writing data to the optical storage medium, the first half-reflecting half-mirror (12) is used to reflect the writing light beam emitted by the read-write laser (11) to the second half-reflecting half-mirror (13), and the second half-reflecting half-mirror (13) is used to reflect the incident light to the liquid objective lens (2), and the incident light is focused to the to-be-recorded layer in the recording layer of the optical storage medium by adjusting the focal length of the liquid objective lens (2) to write data; When reading data from an optical storage medium, the first semi-reflective half-mirror (12) is used to reflect the reading light beam emitted by the read / write laser (11) to the second semi-reflective half-mirror (13), and the second semi-reflective half-mirror (13) is used to reflect the incident light to the liquid objective lens (2). By adjusting the focal length of the liquid objective lens (2), the incident light is converged to the recorded layer in the recording layer of the optical storage medium. The recorded layer reflects the incident light to the liquid objective lens (2), and the liquid objective lens (2) is used to transmit the incident light to the second semi-reflective half-mirror (13). The second semi-reflective half-mirror (13) is used to reflect the incident light to the first semi-reflective half-mirror (12). The first semi-reflective half-mirror (12) is used to transmit the incident light to the reading converging mirror (14), and the reading converging mirror (14) is used to converge the incident light to the reading detector (15), and the data of the optical storage medium is read through the reading detector (15).

3. The liquid lens-based ultra-multi-layer optical storage read-write and servo device according to claim 2, characterized in that: The servo module (4) comprises a servo laser (41) and a third semi-reflective semi-mirror (42); The third semi-reflective half-mirror (42) is used to transmit the servo light beam emitted by the servo laser (41) to the liquid collimating mirror (3); by adjusting the focal length of the liquid collimating mirror (3), the incident light is collimated and transmitted to the second semi-reflective half-mirror (13); the second semi-reflective half-mirror (13) is used to transmit the incident light to the liquid objective lens (2); by adjusting the focal length of the liquid objective lens (2), the incident light is converged to the independent servo guide layer of the optical storage medium (5).

4. The liquid lens-based ultra-multi-layer optical storage read-write and servo device according to claim 3, characterized in that: The servo module (4) further comprises a fourth semi-reflective semi-mirror (43), a tracking detector (44) and a focusing monitoring device (45); The liquid objective lens (2) is used to transmit the light reflected by the independent servo guide layer to the second semi-reflective half-mirror (13), the second semi-reflective half-mirror (13) is used to transmit the incident light to the liquid collimator (3), the liquid collimator (3) is used to transmit the incident light to the third semi-reflective half-mirror (42), the third semi-reflective half-mirror (42) is used to reflect the incident light to the fourth semi-reflective half-mirror (43), the fourth semi-reflective half-mirror (43) is used to reflect the incident light to the tracking detector (44) and transmit it to the focusing monitoring device (45) respectively; The tracking detector (44) monitors the transverse focus position of the servo light beam emitted by the servo laser on the optical storage medium according to the incident light, and transmits the monitoring result to the optical system. The optical system determines whether there is a tracking deviation in the transverse focus position of the servo light beam on the optical storage medium according to the monitoring result of the tracking detector. If there is, the tracking deviation is corrected by adjusting the transverse position of the liquid objective lens (2); The focus monitoring device (45) monitors the longitudinal focus position of the servo light beam emitted by the servo laser on the optical storage medium according to the incident light, and transmits it to the optical system. The optical system determines whether the servo light beam is focused on the independent servo guide layer according to the monitoring result of the focus monitoring device. If it is not focused, the focus deviation is corrected by adjusting the focal length of the liquid objective lens (2).

5. The liquid lens-based ultra-multi-layer optical storage read-write and servo device according to claim 4, characterized in that: The focus monitoring device (45) comprises a pinhole plate (451) and a focus detector (452); The light transmitted by the fourth semi-reflective half-mirror (43) passes through the pinhole on the pinhole plate (451) and then converges on the focusing detector (452).

6. The liquid lens-based ultra-multi-layer optical storage read-write and servo device according to claim 5, characterized in that: The focus monitoring device (45) comprises a cylindrical lens (453) and a four-quadrant detector (454); The light transmitted by the fourth semi-reflective semi-mirror (43) passes through the cylindrical lens (453) and then converges on the four-quadrant detector (454).

7. A method for reading, writing and servoing ultra-multilayer optical storage based on liquid lens, implemented based on the device as claimed in claim 1, characterized in that: Specifically, it includes two steps: writing data into the optical storage medium and reading data from the optical storage medium, wherein: 1) When writing data to the optical storage medium, the read / write module emits a write light beam with a wavelength of λ1, and the servo module emits a servo light beam with a wavelength of λ2; The focal length is adjusted by adjusting the loading voltage of the liquid objective lens and the liquid collimator lens through the optical system, so that the writing light beam is converged to the to-be-recorded layer of the optical storage medium through the liquid objective lens to write data, and at the same time, the servo light beam emitted by the servo module is always converged to the independent servo guide layer of the optical storage medium after passing through the liquid collimator lens and the liquid objective lens; 2) When reading data from the optical storage medium, the read / write module emits a read light beam with a wavelength of λ1, and the servo module emits a servo light beam with a wavelength of λ2; The focal length is adjusted by adjusting the loading voltage of the liquid objective lens and the liquid collimating lens through the optical system, so that the reading light beam is converged to the recorded layer of the optical storage medium through the liquid objective lens for data reading. At the same time, the servo light beam emitted by the servo module is always converged to the independent servo guide layer of the optical storage medium after passing through the liquid collimating lens and the liquid objective lens.

8. The method for reading, writing and servoing super-multi-layer optical storage based on liquid lens according to claim 7 is characterized in that: The process of adjusting the applied voltage of the liquid objective lens through the optical system includes: The longitudinal focusing position of the servo light beam on the optical storage medium is monitored by a focusing monitoring device and transmitted to the optical system. The optical system determines whether the servo light beam is focused on the independent servo guide layer according to the monitoring result of the focusing monitoring device. If it is not focused, the loading voltage of the liquid objective lens is adjusted to adjust the focal length to correct the focusing deviation.

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