CN109524029A - Multiplayer optical disk storage device and method based on dual-beam super-resolution - Google Patents

Multiplayer optical disk storage device and method based on dual-beam super-resolution Download PDF

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Publication number
CN109524029A
CN109524029A CN201710854852.0A CN201710854852A CN109524029A CN 109524029 A CN109524029 A CN 109524029A CN 201710854852 A CN201710854852 A CN 201710854852A CN 109524029 A CN109524029 A CN 109524029A
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CN
China
Prior art keywords
light
beam
linearly polarized
recording
dual
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CN201710854852.0A
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Chinese (zh)
Inventor
原续鹏
阮昊
王中阳
文静
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上海纳光信息科技有限公司
中国科学院上海光学精密机械研究所
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Priority to CN201710854852.0A priority Critical patent/CN109524029A/en
Publication of CN109524029A publication Critical patent/CN109524029A/en

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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0925Electromechanical actuators for lens positioning
    • G11B7/0929Electromechanical actuators for lens positioning for tracking only
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1356Double or multiple prisms, i.e. having two or more prisms in cooperation
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372Lenses
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372Lenses
    • G11B7/1374Objective lenses

Abstract

The present invention provides a kind of optical disk storage apparatus and method based on dual-beam resolution, including excitation generation assembly, for generating the first linearly polarized light;STED generation assembly, for generating the hollow vortex optically-active that central light strength is zero;Combining block, for by the first linearly polarized light and hollow vortex it is photosynthetic and centered on the recording light that is overlapped;Generation assembly is guided, for generating the second linearly polarized light, and receives the tracking error light that the guide layer generates;Second linearly polarized light is focused to guide layer, and the tracking error light that the guide layer generates is back to the guidance generation assembly for the recording light to be focused to recording layer by focus pack, including object lens;Tracking servo component, the movement of object lens in the radial direction described in the tracking error photocontrol for being generated according to the guide layer.The optical disk storage apparatus differentiated based on dual-beam of the invention and method solve the problems, such as that capacity of optical storage can not be continued to lift up because of the constraint of diffraction limit.

Description

Multiplayer optical disk storage device and method based on dual-beam super-resolution

Technical field

The present invention relates to the technical fields of storage medium, fill more particularly to a kind of optical disc storage differentiated based on dual-beam It sets and method.

Background technique

With the continuous development of technique of internet, the amount of storage of numerical data is growing day by day.Many companies, bank, government And scientific research institution is owned by the other information content of PB byte level and needs to store;And existing hard-disk storage technology has been difficult to meet The demand of contemporary society's development.Photon is both the carrier of energy and the carrier of information, therefore utilizes the storage of light progress information It is expected to become the core of next-generation information storage technology.

Nearly 40 years or so, continuous progress, i.e. volume holographicstorage technology are suggested and achieved there are two types of optical storage technology With the optical storage technology stored based on position.

Volume holographicstorage technology is mainly that the Preset grating of storage material is utilized to store information.This optical storage mode is benefit Information is recorded with interfering for object beam and reference beam, thus requires two-beam highly coherent.

Optical storage technology based on position storage utilizes the change physically or chemically of medium produced by photon, such as photic Change in fluorescence or photorefraotive crystal, record information in mediator.The beginning of the eighties, with focusing laser in optical disc media Surface layer causes local variations in refractive index, indicates the beginning of first generation light storage device CD, and amount of storage about 0.7GB/ faces left the right side. Second generation DVD and third generation BD (Blu-ray Disc, Blu-ray Disc) is reduced simultaneously by improving the numerical aperture of write-in object lens The wavelength of laser is written to improve storage density, memory capacity can achieve 4.7GB/ disk respectively and 23.5GB/ the faces left right side.It is subsequent Multilayer DVD and BD can not meet requirement of the up-to-date technology to information storage.This is because when light beam focuses in medium When portion, optical scattering makes focusing efficiency and record efficiency significant attenuation, greatly limits the development of multiplayer optical disk technology.

Due to the constraint by diffraction limit, the numerical apertures of object lens can not infinitely increase, and the wavelength of laser is written also not It may infinitely reduce, cause the memory capacity of the CD after BD just without there is effective improve.In addition, traditional two-dimentional light The information that face storage mode is stored has only taken up the very small part of CD in fact, this promotes three-dimensional light with regard to urgent demand The development of memory technology.

Summary of the invention

In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of light differentiated based on dual-beam Disc memory device and method can not continue to lift up capacity of optical storage because of the constraint of diffraction limit in the prior art for solving The problem of.

In order to achieve the above objects and other related objects, the present invention provides a kind of optical disc storage dress differentiated based on dual-beam It sets, comprising: excitation generation assembly, for generating the first linearly polarized light;Inhibit generation assembly, is for generating central light strength Zero hollow vortex optically-active;Combining block, for by first linearly polarized light and the hollow vortex it is photosynthetic and centered on be overlapped Recording light.

In one embodiment of the invention, the excitation generation assembly includes the first laser light source being sequentially connected, first Condenser lens, the first beam shaping component and linearly polarized light formation component;The first laser light source is for generating oval excitation Light, first condenser lens are used to carry out collimation processing to the oval exciting light;The beam shaping component is used for will be quasi- Oval excitation light shaping circular light that directly treated;The linearly polarized light formation component is used to the round light processing be first Linearly polarized light.

In one embodiment of the invention, the first beam shaping component includes connected the first prism and the second prism; The linearly polarized light formation component includes the first sound-optic modulator being sequentially connected, reflecting mirror and the first polarization beam splitter;It is described First sound-optic modulator is used to adjust the light intensity of circular light, and the reflecting mirror is described for keeping the optical path of the circular light compact First polarization beam splitter is for will treated that round light processing is the first linearly polarized light through the reflecting mirror.

In one embodiment of the invention, the inhibition generation assembly includes the second laser light source being sequentially connected, second Condenser lens, the second beam shaping component and vortex generation assembly;The second laser light source is used to generate oval exciting light, Second condenser lens is used to carry out collimation processing to the oval exciting light;The second beam shaping component is used for will be quasi- Oval excitation light shaping circular light that directly treated;The vortex generation assembly is used for light centered on the round light processing The hollow vortex optically-active for being by force zero.

In one embodiment of the invention, the second beam shaping component includes connected third prism and the 4th prism; The vortex generation assembly includes the second sound-optic modulator being sequentially connected, the second polarization beam splitter and vortex phase plate;Institute Second sound-optic modulator is stated for adjusting the light intensity of circular light, second polarization beam splitter is used for will be through the second acousto-optic tune Device processed treated round beam treatment is linearly polarized light, the vortex phase plate is for will be centered on linearly polarized light processing The hollow vortex optically-active that light intensity is zero.

In one embodiment of the invention, the combining block includes the two-phase color lens being sequentially connected, third polarization beam splitting Piece and the first movable lens;The two-phase color lens are used to first linearly polarized light reflexing to the third polarization beam splitting Piece, the hollow vortex light transmission to the third polarization beam splitter;The third polarization beam splitter is used for the light that will be received Beam is transmitted through first movable lens, and first movable lens are used for inclined to reduce the third by changing light path The spherical aberration that beam splitting chip treated the light beam that shakes generates, to obtain the recording light.

In one embodiment of the invention, further includes:

Generation assembly is guided, for generating the second linearly polarized light, and receives the tracking error of one guide layer of CD generation Light;

Focus pack, including object lens, for the recording light to be focused to one recording layer of CD, by second linear polarization Light focuses to the guide layer, and the tracking error light that the guide layer generates is back to the guidance generation assembly;

Tracking servo component is connected with the guidance generation assembly, for being transmitted according to the guidance generation assembly The movement of object lens in the radial direction described in the tracking error photocontrol come.

In one embodiment of the invention, the guidance generation assembly includes the third laser light source being sequentially connected, third Condenser lens, the 4th polarization beam splitter and the second movable lens;The third laser light source is for generating exciting light;Described Three condenser lenses are for carrying out collimation processing to the exciting light;For that will collimate, treated swashs 4th polarization beam splitter It shines and is transmitted through second movable lens, and the tracking error light that the guide layer generates is reflexed into the tracking and is watched Take component;Second movable lens are used in mobile treated the light reducing the 4th polarization beam splitter of optical axis direction The spherical aberration of generation, to obtain second linearly polarized light.

In one embodiment of the invention, the focus pack include the two-phase prism being sequentially connected, the 4th condenser lens, Quarter wave plate and object lens;The two-phase prism is used to second linearly polarized light being transmitted through the 4th condenser lens, by institute It states recording light and reflexes to the 4th condenser lens;4th condenser lens is used for second linearly polarized light and the note Record light carries out collimation processing;The quarter wave plate is used for Circularly polarized light;The object lens be used for will treated recording light the focuses to recording layer, will treated the second linearly polarized light Focus to the guide layer.

In one embodiment of the invention, the tracking servo component includes the 5th condenser lens, the first light being sequentially connected Electric diode and tracking servo system;5th condenser lens is used to the tracking error light focusing to first photoelectricity Diode;First photodiode is used to the tracking error light after the focusing being converted to tracking error electric signal;Institute Tracking servo system is stated for controlling the movement of the object lens in the radial direction according to the tracking error electric signal.

It further include merging group with described when the CD includes at least two recording layer in one embodiment of the invention The connected focus servo component of part, for receiving the note that current recording layer generates via the focus pack and the combining block Record error light, and the movement of object lens in the direction of the optical axis according to the recording error photocontrol.

In one embodiment of the invention, the focus servo component includes the 6th condenser lens, the second light being sequentially connected Electric diode and focus servosystem;6th condenser lens is used to the recording error light focusing to second photoelectricity Diode;Second photodiode is used to the recording error light after the focusing being converted to recording error electric signal;Institute Focus servosystem is stated for controlling the movement of the object lens in the direction of the optical axis according to the recording error electric signal.

In one embodiment of the invention, second linearly polarized light is overlapped with the record light center.

Meanwhile the present invention also provides a kind of optical disc storage methods differentiated based on dual-beam, comprising the following steps:

Generate the first linearly polarized light;

Generate the hollow vortex optically-active that central light strength is zero;

By first linearly polarized light and the hollow vortex it is photosynthetic and centered on the recording light that is overlapped.

In one embodiment of the invention, further includes:

Generate the second linearly polarized light;

The recording light is focused into one recording layer of CD, second linearly polarized light is focused into one guide layer of CD;

According to the movement of the tracking error photocontrol object lens of guide layer generation in the radial direction.

In one embodiment of the invention, when the CD includes at least two recording layer, further includes:

The movement of object lens in the direction of the optical axis described in the recording error photocontrol generated according to current recording layer.

As described above, the optical disk storage apparatus of the invention differentiated based on dual-beam and method, are had the advantages that

(1) movement of object lens in the radial direction is guided by the groove structure on CD guide layer, is remembered by CD The focus error signal that generates controls the movement of object lens in the direction of the optical axis on record layer, is watched by focus servosystem and tracking Dress system accurately realizes the optical storage of multiplayer optical disk big data;

(2) constraint for breaching diffraction limit, by using dual-beam super resolution technology reduce effective light spot size from And greatly improve the storage density of CD;

(3) it due to the record spot size very little of dual-beam super-resolution, is guided using guide layer included in CD The movement of object lens realizes the high accuracy of optical head focusing;

(4) it is convenient that the operation is simple and flexible, and signal-to-noise ratio is high, and memory capacity is big.

Detailed description of the invention

Fig. 1 is shown as structural representation of the optical disk storage apparatus of the invention differentiated based on dual-beam in an embodiment Figure;

Fig. 2 is shown as structural representation of the optical disk storage apparatus of the invention differentiated based on dual-beam in another embodiment Figure;

Fig. 3 is shown as structural representation of the optical disk storage apparatus of the invention differentiated based on dual-beam in another embodiment Figure;

Fig. 4 is shown as structural representation of the optical disk storage apparatus of the invention differentiated based on dual-beam in another embodiment Figure;

Fig. 5 is shown as flow chart of the optical disc storage method of the invention differentiated based on dual-beam in an embodiment.

Component label instructions

10 excitation generation assembly

20 inhibit generation assembly

30 combining blocks

40 guidance generation assembly

50 focus packs

60 tracking servo components

70 focus servo components

1 first laser light source

2 first condenser lenses

3 first prisms

4 second prisms

5 first sound-optic modulators

6 reflecting mirrors

7 first polarization beam splitters

8 second laser light sources

9 second condenser lenses

10 third prisms

11 the 4th prisms

12 second sound-optic modulators

13 second polarization beam splitters

14 vortex phase plates

15 two-phase color lens

16 third polarization beam splitters

17 first movable lens systems

18 third laser light sources

19 tertiary focusing lens

20 the 4th polarization beam splitters

21 second movable lens systems

22 two-phase prisms

23 the 4th condenser lenses

24 quarter wave plates

25 object lens

26 CDs

27 the 5th condenser lenses

28 first photodiodes

29 tracking servo systems

30 the 6th condenser lenses

31 second photodiodes

32 focus servosystems

Specific embodiment

Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation Content disclosed by book is understood other advantages and efficacy of the present invention easily.

It should be clear that this specification structure depicted in this specification institute accompanying drawings, ratio, size etc., only to cooperate specification to be taken off The content shown is not intended to limit the invention enforceable qualifications so that those skilled in the art understands and reads, therefore Do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing the present invention Under the effect of can be generated and the purpose that can reach, it should all still fall in disclosed technology contents and obtain the model that can cover In enclosing.Meanwhile cited such as "upper" in this specification, "lower", "left", "right", " centre " and " one " term, be also only Convenient for being illustrated for narration, rather than to limit the scope of the invention, relativeness is altered or modified, in no essence It changes under technology contents, when being also considered as the enforceable scope of the present invention.

Multiplayer optical disk according to the present invention includes a guide layer and multiple recording layers.Preferably, guide layer is that setting exists One layer of groove structure of CD bottommost, for controlling the movement of object lens in the radial direction.Recording layer is for realizing data Storage.

STED (stimulated emission depletion, stimulated emission depletion) microscope needs two beams strictly total The laser of axis, wherein a branch of is exciting light, it is in addition a branch of for loss light (also referred to as STED light).Make Airy range using exciting light Interior fluorescent molecule is excited, and electronics is from ground state transition to excitation state.Then, sample is irradiated using the loss light of baked donut type Product so that the excited state molecule in excitation hot spot periphery is released energy in a manner of stimulated radiation and returns to ground state, and are located at and swash Then the not impaired influence depleted, continuation return to ground state to the excited state molecule of luminous spot interior zone in a manner of autofluorescence.This The combination of kind lighting method, regions of fluorescence emissions is limited to less than in the region of Airy, is obtained one and is less than diffraction pole The fluorescence radiation point of limit.Above-mentioned is dual-beam super resolution technology.

Therefore, based on dual-beam super resolution technology carry out CD data storage when, it is a branch of by diffraction limit constrain Gaussian-shape exciting light, which focuses on, to be used to cause optical recording on video disc recording layer, and the vortex circle that in addition a branch of central light strength is zero is poly- Burnt hot spot (also referred to as STED light) inhibits optical recording, and the center of this two-beam overlaps.At this point, optical recording phenomenon can only Occur at the center of focal beam spot and edge is suppressed, to reduce the size of effectively record hot spot, reaches and pass through increase The purpose of packing density promotion memory capacity.

In an embodiment, as shown in Figure 1, the optical disk storage apparatus of the invention differentiated based on dual-beam includes:

Generation assembly 10 is excited, for generating the first linearly polarized light.

Inhibit generation assembly 20, for generating the hollow vortex optically-active that central light strength is zero.

Combining block 30, for by first linearly polarized light and the hollow vortex it is photosynthetic and centered on the record that is overlapped Light.

By using above-mentioned recording light, the size of effectively record hot spot is reduced, to reach by increasing packing density Promote memory capacity.

Setting CD includes guide layer and a recording layer.As shown in Fig. 2, in another embodiment, it is of the invention based on The optical disk storage apparatus that dual-beam is differentiated further include:

Generation assembly 40 is guided, for generating the second linearly polarized light, and receives the tracking error that the guide layer generates Light.

Focus pack 50, including object lens, for the recording light to be focused to the recording layer, by second linear polarization Light focuses to the guide layer, and the tracking error light that the guide layer generates is back to the guidance generation assembly.

Tracking servo component 60 is connected with the guidance generation assembly, for being passed according to the guidance generation assembly The movement of object lens in the radial direction described in the tracking error photocontrol sent.

By guiding the mutual cooperation of generation assembly 40, focus pack 50 and tracking servo component 60, using in CD The guide layer for being included guides the movements of object lens, realizes the high accuracy that the optical head on single recording layer focuses.

In another embodiment, setting CD includes guide layer and at least two recording layers.As shown in figure 3, of the invention Based on dual-beam differentiate optical disk storage apparatus further include the focus servo component 70 being connected with the combining block, be used for via The focus pack and the combining block receive the recording error light that the recording layer generates, and according to the recording error The movement of object lens described in photocontrol in the direction of the optical axis.

By the setting of focus servo component 70, the accurate switching between multiple recording layers is realized, and then ensure that more The information storage of layer CD.

Carry out the optical disk storage apparatus differentiated based on dual-beam that the present invention is further explained below by specific embodiment.

As shown in figure 4, the excitation generation assembly includes the first laser light source 1 being sequentially connected, the first condenser lens 2, the first beam shaping component and linearly polarized light formation component;The first laser light source 1 is described for generating oval exciting light First condenser lens 2 is used to carry out collimation processing to the oval exciting light;The beam shaping component is for handling collimation Oval excitation light shaping circular light afterwards;The linearly polarized light formation component is used to the round light processing be the first linear polarization Light.

In one embodiment of the invention, the first beam shaping component includes connected the first prism 3 and the second prism 4.Beam shaping is the capacity usage ratio in order to improve light beam.Angle between first prism 3 and the second prism 4 is needed according to reality The requirement of border light beam adjusts.Why using two prisms beam shaping is carried out, is the shaping effect because of a prism It is bad.The linearly polarized light formation component includes the first sound-optic modulator 5, reflecting mirror 6 and the first polarization beam splitting being sequentially connected Piece 7;The first sound-optic modulator 5 is used to adjust the light intensity of circular light, and the reflecting mirror 6 is used to make the optical path of the circular light Compact, first polarization beam splitter 7 is for will treated that round light processing is the first linearly polarized light through the reflecting mirror.It needs What is illustrated is upper, and laser light source employed in the present invention is semiconductor laser, and the light beam of sending is all incomplete ball Surface wave shape, but since the beam quality to exciting light is more demanding, so having to carry out light beam to exciting light with shaping element Shaping becomes the preferably round light beam of quality.

The inhibition generation assembly includes the second laser light source 8 being sequentially connected, the second condenser lens 9, the second light beam Shaping component and vortex generation assembly;The second laser light source 8 is for generating oval exciting light, second condenser lens 9 for carrying out collimation processing to the oval exciting light;The second beam shaping component is for the ellipse that will collimate that treated Excite light shaping circular light;The vortex generation assembly is used to be hollow vortex that center light intensity is zero by the round light processing Optically-active.

In one embodiment of the invention, the second beam shaping component includes connected third prism 10 and the 4th prism 11.It similarly, is in order to which beam shaping is better achieved using two prisms.The vortex generation assembly includes being sequentially connected Second sound-optic modulator 12, the second polarization beam splitter 13 and vortex phase plate 14;The second sound-optic modulator 12 is for adjusting The light intensity of circular light, second polarization beam splitter 13 is for will be through the second sound-optic modulator 12 treated round light beam Processing is linearly polarized light, and the vortex phase plate 14 is used to the linearly polarized light handling the hollow vortex for being zero for center light intensity Light.Wherein, what the vortex phase plate 14 generated is the hollow vortex optically-active of circular polarization, i.e. the wavefront of light wave is helical form knot Structure, central light strength zero inhibit light by being promoted this ensures that photo-recording process can only occur in the center of focal beam spot Light intensity can reduce the size of effectively record hot spot to promoting storage density.Need to illustrate is upper, employed in the present invention Laser light source is semiconductor laser, and the light beam of sending is all incomplete spherical surface waveform, but due to the light beam for inhibiting light Quality requirement is higher, so having to that it is preferably round to become quality to inhibiting light to carry out beam shaping with shaping element Light beam.

The combining block includes that the two-phase color lens 15 being sequentially connected, third polarization beam splitter 16 and first are removable saturating Mirror 17;The two-phase color lens 15 are used to first linearly polarized light reflexing to the third polarization beam splitter 16, the sky Vortex cordis optically-active is transmitted through the third polarization beam splitter 16;The third polarization beam splitter 16 is used to transmit the light beam received To first movable lens 17, first movable lens 17 are used to polarize by changing light path to reduce the third The spherical aberration that treated the light beam of beam splitting chip 16 generates, to obtain the recording light that the center is overlapped.Preferably, described first is removable Dynamic lens 17 can carry out the movement in horizontal direction by mechanisms such as manual or stepper motors.It should be noted that described The center of one linearly polarized light and the hollow vortex optically-active must be overlapped, and otherwise will affect the precision of super-resolution, and then it is close to influence storage Degree.

The guidance generation assembly includes that the third laser light source 18 being sequentially connected, tertiary focusing lens the 19, the 4th are inclined Shake beam splitting chip 20 and the second movable lens 21.The third laser light source 18 is for generating exciting light;The tertiary focusing is saturating Mirror 19 is for carrying out collimation processing to the exciting light;4th polarization beam splitter 20 is for the exciting light that will collimate that treated Second movable lens 21 are transmitted through, and the tracking error light that the guide layer generates is reflexed into the tracking servo Component;Second movable lens 21 are in optical axis direction movement, to reduce the 4th polarization beam splitter 20, treated The spherical aberration that light generates, to obtain second linearly polarized light.Wherein, the tracking error light that guide layer generates along focus pack and draws Guide-lighting formation component backtracking, and the tracking servo component is reflexed in the 4th polarization beam splitter 20.

The focus pack includes the two-phase prism 22 being sequentially connected, the 4th condenser lens 23, quarter wave plate 24 and object lens 25;The two-phase prism 22 is used to second linearly polarized light being transmitted through the 4th condenser lens 23, by the record Light reflexes to the 4th condenser lens 23;4th condenser lens 23 is used for second linearly polarized light and the record Light carries out collimation processing;The quarter wave plate 24 is used for Circularly polarized light;The object lens 25 be used for will treated recording light the focuses to recording layer, will treated the second linear polarization Light focuses to the guide layer.

The tracking servo component includes that the 5th condenser lens 27, the first photodiode 28 and tracking being sequentially connected are watched Dress system 29;5th condenser lens 27 is used to the tracking error light focusing to first photodiode 28;Institute The first photodiode 28 is stated for the tracking error light after the focusing to be converted to tracking error electric signal;The tracking is watched Dress system 29 is used to control the movement of the object lens in the radial direction according to the tracking error electric signal.

When including 26 at least two recording layer of CD, the optical disk storage apparatus of the embodiment differentiated based on dual-beam It further include the focus servo component being connected with the combining block, for being received via the focus pack and the combining block The recording error light that current recording layer generates, and the shifting of object lens in the direction of the optical axis according to the recording error photocontrol It is dynamic.

In one embodiment of the invention, the focus servo component includes the 6th condenser lens 30, second being sequentially connected Photodiode 31 and focus servosystem 32.Recording layer generate recording error light along focus pack backtracking, and via Two-phase prism reflexes to combining block, and the 6th condenser lens 30 is reflexed on third polarization beam splitter 16.It is described 6th condenser lens 30 is used to the recording error light focusing to second photodiode 31;Second photoelectricity, two pole Pipe 31 is used to the recording error light after the focusing being converted to recording error electric signal;The focus servosystem 32 is used for root The movement of the object lens in the direction of the optical axis is controlled according to the recording error electric signal.

For signal-to-noise ratio with higher, the first linearly polarized light, hollow vortex optically-active and second linearly polarized light this three-beam Center must be overlapped.The optical disk storage apparatus differentiated based on dual-beam of the invention is in focus servosystem and tracking servo system Under the action of, the movement of object lens in the radial direction is controlled by the groove structure on guide layer, by generating on recording layer Recording error signal be used to control the movement of object lens in the direction of the optical axis, thus accurately realize multiplayer optical disk optical storage.

As shown in figure 5, in an embodiment, the optical disc storage method of the invention differentiated based on dual-beam, including it is following Step:

Step S1, the first linearly polarized light is generated.

Step S2, the hollow vortex optically-active that central light strength is zero is generated.

Step S3, by first linearly polarized light and the hollow vortex it is photosynthetic and centered on the recording light that is overlapped.

Step S4, the second linearly polarized light is generated.

Step S5, the recording light is focused into one recording layer of CD, second linearly polarized light is focused into CD one Guide layer.

Step S6, the movement according to the tracking error photocontrol object lens of guide layer generation in the radial direction.

Step S7, the movement of object lens in the direction of the optical axis according to the recording error photocontrol that current recording layer generates.

Wherein, step S1-S3 is used to carry out data storage on single recording layer for generating recording light, step S4-S6, Step S7 between several record layers for switching over.The specific embodiment of above-mentioned each step is as previously mentioned, therefore herein It repeats no more.

In conclusion the optical disk storage apparatus of the invention differentiated based on dual-beam and method are passed through on CD guide layer Groove structure guides the movement of object lens in the radial direction, is controlled by the focus error signal generated on video disc recording layer The movement of object lens in the direction of the optical axis accurately realizes multiplayer optical disk big data by focus servosystem and tracking servo system Optical storage;The constraint for breaching diffraction limit, by using dual-beam super resolution technology reduce effective light spot size to Greatly improve the storage density of CD;Due to the record spot size very little of dual-beam super-resolution, using being wrapped in CD The guide layer contained guides the movements of object lens, realizes the high accuracy of optical head focusing;It is convenient that the operation is simple and flexible, noise Than high, memory capacity is big.So the present invention effectively overcomes various shortcoming in the prior art and has high industrial exploitation value Value.

The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as At all equivalent modifications or change, should be covered by the claims of the present invention.

Claims (16)

1. a kind of optical disk storage apparatus differentiated based on dual-beam, it is characterised in that: include:
Generation assembly is excited, for generating the first linearly polarized light;
Inhibit generation assembly, for generating the hollow vortex optically-active that central light strength is zero;
Combining block, for by first linearly polarized light and the hollow vortex it is photosynthetic and centered on the recording light that is overlapped.
2. the optical disk storage apparatus according to claim 1 differentiated based on dual-beam, it is characterised in that: the excitation photoproduction It include that the first laser light source being sequentially connected, the first condenser lens, the first beam shaping component and linearly polarized light generate at component Component;The first laser light source is used for for generating oval exciting light, first condenser lens to the oval exciting light Carry out collimation processing;The beam shaping component excites light shaping circular light for will collimate that treated oval;The line is inclined Generation assembly of shaking is used to the round light processing be the first linearly polarized light.
3. the optical disk storage apparatus according to claim 2 differentiated based on dual-beam, it is characterised in that: first light beam Shaping component includes connected the first prism and the second prism;The linearly polarized light formation component includes the first sound being sequentially connected Optical modulator, reflecting mirror and the first polarization beam splitter;The first sound-optic modulator is used to adjust the light intensity of circular light, described anti- Mirror is penetrated for keeping the optical path of the circular light compact, first polarization beam splitter is for will be through the reflecting mirror treated circle Shape light processing is the first linearly polarized light.
4. the optical disk storage apparatus according to claim 1 differentiated based on dual-beam, it is characterised in that: the inhibition photoproduction At component include the second laser light source being sequentially connected, the second condenser lens, the second beam shaping component and vortex photoproduction in groups Part;The second laser light source for generating oval exciting light, second condenser lens be used for the oval exciting light into The processing of row collimation;The second beam shaping component excites light shaping circular light for will collimate that treated oval;The whirlpool Optically-active formation component is used to be hollow vortex optically-active that center light intensity is zero by the round light processing.
5. the optical disk storage apparatus according to claim 4 differentiated based on dual-beam, it is characterised in that: second light beam Shaping component includes connected third prism and the 4th prism;The vortex generation assembly includes the second acousto-optic being sequentially connected Modulator, the second polarization beam splitter and vortex phase plate;The second sound-optic modulator is used to adjust the light intensity of circular light, described Second polarization beam splitter is for will treated that round beam treatment is linearly polarized light, the whirlpool through the second sound-optic modulator Rotation phase-plate is used to the linearly polarized light handling the hollow vortex optically-active for being zero for center light intensity.
6. the optical disk storage apparatus according to claim 1 differentiated based on dual-beam, it is characterised in that: the combining block Including the two-phase color lens, third polarization beam splitter and the first movable lens being sequentially connected;The two-phase color lens are used for will First linearly polarized light reflexes to the third polarization beam splitter, the hollow vortex light transmission to the third polarization beam splitting Piece;The third polarization beam splitter is used to the light beam received being transmitted through first movable lens, and described first is removable Dynamic lens are used to reduce the third polarization beam splitter by changing light path treated the spherical aberration that light beam generates, to obtain State recording light.
7. the optical disk storage apparatus according to claim 1 differentiated based on dual-beam, it is characterised in that: further include:
Generation assembly is guided, for generating the second linearly polarized light, and receives the tracking error light of one guide layer of CD generation;
Focus pack, including object lens gather second linearly polarized light for the recording light to be focused to one recording layer of CD Coke is back to the guidance generation assembly to the guide layer, and by the tracking error light that the guide layer generates;
Tracking servo component is connected with the guidance generation assembly, for according to it is described guidance generation assembly transmission come The movement of object lens described in tracking error photocontrol in the radial direction.
8. the optical disk storage apparatus according to claim 7 differentiated based on dual-beam, it is characterised in that: the guidance photoproduction It include the third laser light source being sequentially connected, tertiary focusing lens, the 4th polarization beam splitter and the second movable lens at component; The third laser light source is for generating exciting light;The tertiary focusing lens are for carrying out collimation processing to the exciting light; 4th polarization beam splitter is transmitted through second movable lens for the exciting light that will collimate that treated, and will described in The tracking error light that guide layer generates reflexes to the tracking servo component;Second movable lens are used in optical axis direction Mobile treated reducing the 4th polarization beam splitter spherical aberration that light generates, to obtain second linearly polarized light.
9. the optical disk storage apparatus according to claim 7 differentiated based on dual-beam, it is characterised in that: the focus pack Including two-phase prism, the 4th condenser lens, quarter wave plate and the object lens being sequentially connected;The two-phase prism is used for will be described Second linearly polarized light is transmitted through the 4th condenser lens, and the recording light is reflexed to the 4th condenser lens;Described Four condenser lenses are for carrying out collimation processing to second linearly polarized light and the recording light;The quarter wave plate is used for institute Stating collimation treated the second linearly polarized light and record light processing is circularly polarized light;The object lens are used for will treated recording light The recording layer is focused to, the second linearly polarized light focuses to the guide layer by treated.
10. the optical disk storage apparatus according to claim 7 differentiated based on dual-beam, it is characterised in that: the tracking is watched Taking component includes the 5th condenser lens, the first photodiode and the tracking servo system being sequentially connected;Described 5th focuses thoroughly Mirror is used to the tracking error light focusing to first photodiode;First photodiode is used for will be described poly- Defocused tracking error light is converted to tracking error electric signal;The tracking servo system is used for according to the tracking error telecommunications Number movement of the control object lens in the radial direction.
11. the optical disk storage apparatus according to claim 7 differentiated based on dual-beam, it is characterised in that: when the CD It further include the focus servo component being connected with the combining block when including at least two recording layers, for via the focusing Component and the combining block receive the recording error light that current recording layer generates, and according to the recording error photocontrol institute State the movement of object lens in the direction of the optical axis.
12. the optical disk storage apparatus according to claim 11 differentiated based on dual-beam, it is characterised in that: the focusing is watched Taking component includes the 6th condenser lens, the second photodiode and the focus servosystem being sequentially connected;Described 6th focuses thoroughly Mirror is used to the recording error light focusing to second photodiode;Second photodiode is used for will be described poly- Defocused recording error light is converted to recording error electric signal;The focus servosystem is used for according to the recording error telecommunications Number movement of the control object lens in the direction of the optical axis.
13. the optical disk storage apparatus according to claim 7 differentiated based on dual-beam, it is characterised in that: second line Polarised light is overlapped with the record light center.
14. a kind of optical disc storage method differentiated based on dual-beam, it is characterised in that: the following steps are included:
Generate the first linearly polarized light;
Generate the hollow vortex optically-active that central light strength is zero;
By first linearly polarized light and the hollow vortex it is photosynthetic and centered on the recording light that is overlapped.
15. the optical disc storage method according to claim 14 differentiated based on dual-beam, it is characterised in that: further include:
Generate the second linearly polarized light;
The recording light is focused into one recording layer of CD, second linearly polarized light is focused into one guide layer of CD;
According to the movement of the tracking error photocontrol object lens of guide layer generation in the radial direction.
16. the optical disc storage method according to claim 15 differentiated based on dual-beam, it is characterised in that: when the CD When including at least two recording layers, further includes:
The movement of object lens in the direction of the optical axis described in the recording error photocontrol generated according to current recording layer.
CN201710854852.0A 2017-09-20 2017-09-20 Multiplayer optical disk storage device and method based on dual-beam super-resolution CN109524029A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101325067A (en) * 2007-06-12 2008-12-17 索尼株式会社 Optical disc device and converging position correction method
CN105993045A (en) * 2013-11-28 2016-10-05 斯威本科技大学 Method and system for optical data storage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101325067A (en) * 2007-06-12 2008-12-17 索尼株式会社 Optical disc device and converging position correction method
CN105993045A (en) * 2013-11-28 2016-10-05 斯威本科技大学 Method and system for optical data storage

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