CN105096974B - Full figure device and its method for reading data - Google Patents
Full figure device and its method for reading data Download PDFInfo
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- CN105096974B CN105096974B CN201510595138.5A CN201510595138A CN105096974B CN 105096974 B CN105096974 B CN 105096974B CN 201510595138 A CN201510595138 A CN 201510595138A CN 105096974 B CN105096974 B CN 105096974B
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Abstract
The present invention relates to a kind of full figure device, full image storage device, shearing interferometer and optical receiver are included.Full image storage device is set reads light to disc to provide, so that read light turns into diffraction light after disc diffraction.Shearing interferometer is set to receive diffraction light, and diffraction light is converted into the first light beam and the second light beam.Optical receiver is set to receive the first light beam and the second light beam that shearing interferometer provides.
Description
Technical field
The present invention relates to a kind of full figure device and its method for reading data.
Background technology
With the development of science and technology, the required storage dosage of electronic record is also followed
Rise.Common storing mode is the change on record storage medium surface magnetically or optically, to be used as stored data
Foundation, such as disk sheet or disc.However, with the required storage dosage increase of electronic record, the technology of full figure storage
Development starts to attract attention.
Full figure storing technology is that after producing interference through signal light and reference light, image data is write into storage medium
In (photosensitive material).When reading the data, through again irradiate reference light to storage medium (photosensitive material) on, you can by around
Penetrate and produce diffraction light.Then, caused diffraction light is read by receiver again.
Translated in by diffraction light in the step of numerical data, because diffraction light may be received by the influence of noise
The read step that device is carried out to diffraction light may be multiple, more accurately to calculate data content and eliminate noise.However, repeatedly
Read step will extend the time that diffraction light is translated to numerical data so that receiver is bad to the efficiency of digital independent.
Therefore, how to lift the reading efficiency of full figure storing technology turns into the target of currently associated area research.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of full figure device, and it turns diffraction light through shearing interferometer
It is changed to the first light beam and the second light beam, and in forming the first areas imaging and the second areas imaging on optical receiver.Through
One areas imaging and the data point that initial reference signal point is corresponded in the second areas imaging, the first data sheet of the first areas imaging
The phase of first lattice can be calculated out by the data point of known phase.When the first areas imaging the first data cells it
After phase is calculated out, full figure device can read out data stored in disc.The mode calculated through above phase,
Full figure device is to the reading times of disc for once so that full figure device is shortened to the disc Jin Hang Read times taken.
Preferably, the full figure device includes full image storage device, shearing interferometer and optical receiver.Full figure storage dress
Install and read light to disc to provide, so that read light turns into diffraction light after disc diffraction.Shearing interferometer is set to connect
Diffraction light is received, and diffraction light is converted into the first light beam and the second light beam, wherein the first light beam and the second light beam are parallel to each other.Light
Receiver is learned to set to receive the first light beam and the second light beam that shearing interferometer provides.
Preferably, the full image storage device includes light source module.Light source module is set to provide signal light, wherein light source
The signal light that module provides has initial reference signal point.
Preferably, shearing interferometer includes reflective shearing flat board or penetration shearing flat board.
Preferably, the full figure device further includes afocal system.Afocal system is arranged at shearing interferometer and received with optics
Between device, wherein afocal system is reducing the first light beam and the second light beam that shearing interferometer provides on optical receiver
Imaging.
Preferably, the shearing interferometer includes transparency carrier and dielectric layer.Transparency carrier has relative and not parallel
First surface and second surface.Dielectric layer is arranged at first surface and parallel with first surface.
Preferably, the thickness of dielectric layer is more than 0 micron (μm) and is less than or equal to 10 microns (μm).
Preferably, the full figure device further includes afocal system.Afocal system is arranged at shearing interferometer and received with optics
Between device, wherein afocal system is amplifying the first light beam and the second light beam that shearing interferometer provides on optical receiver
Imaging.
Preferably, the full figure device further includes the first lens, the second lens and low pass filter.First lens and second
Lens are arranged between full image storage device and shearing interferometer, and the diffraction of shearing interferometer is marched to from full image storage device
Light sequentially passes through the first lens and the second lens.Low pass filter is arranged between the first lens and the second lens.LPF
Utensil has a unthreaded hole, the size of unthreaded hole between optical receiver 1X1 minimum picture element units to optical receiver 4X4 minimum
Between picture element unit.
Preferably, the first light beam and the second light beam that the shearing interferometer provides are in the imaging model on optical receiver
Enclose respectively the first areas imaging and the second areas imaging.First areas imaging and the square that the second areas imaging is identical size
Shape, and the first areas imaging and the second areas imaging part overlap.
Preferably, it is poor with lateral separation to there is fore-and-aft distance difference between first areas imaging and the second areas imaging.
Lateral separation difference and the tangent value that the ratio of fore-and-aft distance difference is an angle, wherein this angle more than or equal to 0 degree and be less than or
Equal to 90 degree.
Preferably, the shearing interferometer sets the lateral separation so that between the first areas imaging and the second areas imaging
The integral multiple of difference or the poor minimum picture element unit for optical receiver of fore-and-aft distance.
Preferably, wherein shearing interferometer is made up of the first convergent lens, the second convergent lens and raster unit.First meeting
Poly- lens and the second convergent lens are arranged between full image storage device and optical receiver, and are marched to from full image storage device
The diffraction light of optical receiver sequentially passes through the first convergent lens and the second convergent lens.It is saturating that raster unit is arranged at the first convergence
Between mirror and the second convergent lens.
Preferably, raster unit includes the first grating and the second grating.Second grating and the first parallel gratings are set, and from
First convergent lens marches to the diffraction light of the second convergent lens sequentially by the first grating and the second grating.
Preferably, raster unit includes tilting grating (blazed grating) or bifrequency formula grating (double
frequency grating)。
Another technical problem to be solved by this invention is to provide a kind of method for reading data of full figure device, comprising under
Row step.There is provided signal light to disc, wherein signal light through full image storage device has initial reference signal point so that disc
It is interior to record the information for having corresponding initial reference signal point.There is provided through full image storage device and read light to disc so that read light
Diffraction light is formed after disc produces diffraction, wherein diffraction light has the data point of corresponding initial reference signal point.Through shearing
Interferometer is converted to diffraction light the first light beam and the second light beam parallel to each other.The first light beam and the second light beam are guided to optics
Receiver.First light beam and the second light beam are respectively the first areas imaging and the second imaging in the areas imaging on optical receiver
Scope.First areas imaging and the rectangle that the second areas imaging is identical size, and the first areas imaging and the second areas imaging
Part overlaps.
Preferably, the first areas imaging has the first data cells, and every one first data cells have first phase
Or second phase.Second areas imaging has the second data cells, and every one second data cells have first phase or
Two phase.In every one first data cells and every one second in the region of the first areas imaging and the second areas imaging overlapping
Information unit lattice are completely superposed.
Preferably, the method for reading data further includes the region according to the first areas imaging and the second areas imaging overlapping
Interior the first data cells being completely superposed and the second data cells, the first light beam that shearing interferometer is provided and the
Two light beams are converted to intensity distribution form through interference from phase distribution form.
Preferably, by the first light beam and the second light beam through interference from phase distribution form be converted to intensity distribution form it
Step further includes the following steps.The first data cells and the second data cells being completely superposed when each group are all the first phase
Position or during second phase, define the first data cells that this group is completely superposed and the second data cells in optical receiver it
Intensity is the first intensity.The first data cells and the second data cells being completely superposed when each group are respectively first phase
During with second phase, define the first data cells that this group is completely superposed and the second data cells are strong in optical receiver
Spend for the second intensity.
Preferably, method for reading data further includes following steps.By the first light beam and the second light beam from phase distribution form
After being converted to intensity distribution form, through intensity distribution form of first light beam with the second light beam and corresponding initial reference signal point
Data point, calculate the first areas imaging in every one first data cells phase.
Preferably, calculate that the step of the phase of every one first data cells in the first areas imaging further includes following step
Suddenly.It is completely heavy to other each groups the one of the data point of initial reference signal point is corresponded to since in the first data cells
The first data cells and the second data cells of conjunction are calculated.
Preferably, it is poor with lateral separation to there is fore-and-aft distance difference between the first areas imaging and the second areas imaging.Laterally
Range difference and the tangent value that the ratio of fore-and-aft distance difference is an angle, wherein this angle are more than or equal to 0 degree and are less than or equal to
90 degree.
Brief description of the drawings
Fig. 1 is the light path schematic diagram of the full figure device of the first embodiment of the present invention.
Fig. 2A is the configuration schematic diagram that the full image storage device of the full figure device of the 1st figure is configured with coaxial manner.
Fig. 2 B are the configuration schematic diagram that the full image storage device of the full figure device of the 1st figure is configured in a manner of off-axis.
Fig. 3 A are the first light beam of the 1st figure in the schematic diagram of the first areas imaging on optical receiver.
Fig. 3 B are the second light beam of the 1st figure in the schematic diagram of the second areas imaging on optical receiver.
Fig. 4 A and Fig. 4 B are the schematic diagram that the full figure device of the 1st figure carries out the reading of the first light beam and the second light beam.
Fig. 5 A to Fig. 5 I have initial reference signal point by what the full image storage device among Fig. 1 full figure device provided
Signal light in the schematic diagram of multiple embodiments.
Fig. 6 is the light path schematic diagram of the full figure device of the second embodiment of the present invention.
Fig. 7 is the light path schematic diagram of the full figure device of the 3rd embodiment of the present invention.
Fig. 8 is the configuration schematic diagram of the full figure device of the 4th embodiment of the present invention.
Fig. 9 is the light path schematic diagram of the full figure device of the 5th embodiment of the present invention.
Figure 10 A are the light path schematic diagram of the full figure device of the 6th embodiment of the present invention.
Figure 10 B are the configuration schematic diagram of Figure 10 A raster unit.
Figure 11 A are the light path schematic diagram of the full figure device of the 7th embodiment of the present invention.
Figure 11 B are the configuration schematic diagram of Figure 11 A raster unit.
Figure 12 is the light path schematic diagram of the full figure device of the 8th embodiment of the present invention.
100 full figure devices；102 full image storage devices；104 low pass filters；105 unthreaded holes；106 discs；108 optics receive
Device；109 first speculums；110 first lens；111 second lens；112A, 112B guide lens；113 galvanometers；114 light source dies
Block；115th, 115A, 115B spatial light modulator；116th, 116A, 116B polarization spectroscope；117 dichronic mirrors；118 second reflections
Mirror；119 object lens；120 shearing interferometers；122 reflective shearing flat boards；124 penetration shear flat board；126 afocal systems；128
Transparency carrier；130 dielectric layers；132 first convergent lenses；134 second convergent lenses；136 raster units；138 first gratings；
140 second gratings；142 tilting gratings；144 bifrequency formula gratings；P1 first phase；P2 second phase；A1 first is imaged model
Enclose；The areas imagings of A2 second；D diffraction light；M、MijFirst information unit lattice；N、NijSecond information unit lattice；R initial references are interrogated
Number point；L reads light；The light beams of L1 first；The light beams of L2 second；L3, L4, L5, L6, L7, L8, L9, L10, L11, L12 light beam；S1
One surface；S2 second surfaces；V fore-and-aft distances are poor；H lateral separations are poor；θ angles.
Embodiment
With schema and the clear spirit for illustrating the present invention will be described in detail below, had in any art usual
Skill is after the better embodiment of the present invention is understood, when can be changed and modified by the technology of teachings of the present invention, its
Without departing from the spirit and scope of the present invention.
In full figure stocking system, when carrying out write-in storage data to full figure disc, by signal light and reference light group
Into light beam need the photosensitive material in the disc to certain limit to be interfered and exposed.When reading the data, through weight
On photosensitive material in new irradiation reference light to disc, you can produce diffraction light by diffraction.Then, caused diffraction light is again
Read by receiver.In the step that receiver reads diffraction light, in order to accurately be calculated diffraction light and avoid calculating
As a result by noise jamming, the reading times that receiver is carried out to diffraction light may be multiple.However, multiple read step will
Extend read access time of the full figure device to disc so that the read performance of full figure device and efficiency are low.
In view of this, diffraction light is converted to the first light beam and the second light by the full figure device of the present invention through shearing interferometer
Beam, and in forming the first areas imaging and the second areas imaging on optical receiver.It is imaged through the first areas imaging and second
In the range of correspond to the data point of initial reference signal point, the phase of the first data cells of the first areas imaging can be by
Know that the data point of phase is calculated out.After the phase of the first data cells of the first areas imaging is calculated out, entirely
As device can read out data stored in disc.In other words, optical receiver is to the reading of diffraction light progress once
It can obtain the phase information stored by disc so that full figure device takes the time to be shortened disc Read.Furthermore full figure is installed on
Suo Duan Read take Reng Ke Read in the case of the time to go out the data of high quality, therefore the read performance of full figure device can be significantly with efficiency
Lifting.
Fig. 1 illustrates the light path schematic diagram of the full figure device 100 of the first embodiment of the present invention.Full figure device 100 includes
Full image storage device 102, low pass filter 104, shearing interferometer 120, optical receiver 108, the first speculum 109, first
The lens 111 of lens 110 and second, wherein full image storage device 102 can be coaxial-type framework or off-axis formula framework.In diffraction
In light D light path, diffraction light D is sequentially saturating by the first lens 110, low pass filter 104, second from full image storage device 102
After mirror 111, the first speculum 109, shearing interferometer 120, into optical receiver 108.In other embodiment, diffraction light
D can pass through shearing interferometer 120 and entrance optical receiver 108 from full image storage device 102.
In addition, the full figure device 100 that Fig. 1 is painted is configured to represent the component priority order that diffraction light D passes through in its light path
Relation, rather than actual component relative position relation.That is, persond having ordinary knowledge in the technical field of the present invention can foundation
The design of diffraction light D light path, adjust the actual relative position relation between component.For example, in different diffraction light D light path
In design, the first speculum 109 can also be omitted.
Please first see Fig. 2A and Fig. 2 B.Fig. 2A illustrates the full image storage device 102 of Fig. 1 full figure device 100 with coaxial side
The configuration schematic diagram of formula configuration.What the full image storage device 102 that Fig. 2 B illustrate Fig. 1 full figure device 100 was configured in a manner of off-axis
Configuration schematic diagram.
In Fig. 2A, the full image storage device 102 of full figure device 100 is coaxial-type framework, and wherein full image storage device 102 wraps
Containing light source module 114, spatial light modulator 115, polarization spectroscope 116, dichronic mirror 117, the second speculum 118 and object lens 119,
Wherein low pass filter 104, the first lens 110 and the second lens 111 are arranged between polarization spectroscope 116 and dichronic mirror 117.
In addition, in the full image storage device 102 that configures of coaxial manner of full figure device 100, the first speculum 109 in Fig. 1 can be with
It is omitted.
When being read out, light source module 114, which provides, reads light L so that reading light L can be from light source module 114 sequentially
Pass through spatial light modulator 115, polarization spectroscope 116, the first lens 110, low pass filter 104, the second lens 111, color separation
Mirror 117, the second speculum 118 and object lens 119 simultaneously inject disc 106.Read light L turns into diffraction light D after the diffraction of disc 106.
Then, diffraction light D marches to polarization spectroscope 116 and is directed to shearing by polarization spectroscope 116 and does along the path of original optical path again
Interferometer 120.Optical receiver 108 is set to receive the light beam of the offer of shearing interferometer 120.
In Fig. 2 B, the full image storage device 102 of full figure device 100 is off-axis formula framework, and wherein full image storage device 102 wraps
Containing galvanometer 113, light source module 114, spatial light modulator 115A and 115B, guiding lens 112A and 112B, polarization spectroscope
116A and 116B, dichronic mirror 117 and object lens 119, wherein low pass filter 104, the first lens 110 and the second lens 111 are set
Between the speculum 109 of dichronic mirror 117 and first.
Similarly, when being read out, light source module 114, which provides, reads light L so that reading light L can be from light source module
114 sequentially by guiding lens 112A, spatial light modulator 115A, polarization spectroscope 116A and 116B, galvanometer 113, guiding thoroughly
Mirror 112B and object lens 119 simultaneously inject disc 106.Read light L turns into diffraction light D after the diffraction of disc 106.Then, diffraction light D is again
From disc 106 sequentially along object lens 119, dichronic mirror 117, spatial light modulator 115B, dichronic mirror 117, the first lens 110, low pass
The lens 111 of wave filter 104 and second march to the first speculum 109 and are directed to shearing interferometer by the first speculum 109
120.Optical receiver 108 is set to receive the light beam of the offer of shearing interferometer 120.
In addition, the component Configuration relation in the full figure device 100 that Fig. 2A and Fig. 2 B are painted is only to illustrate, and unrestricted
Component Configuration relation in the full figure device 100 of the present invention.Persond having ordinary knowledge in the technical field of the present invention can be according to
According to the design of different diffraction light D light path, the relative position relation between component is adjusted.
Go back to Fig. 1.Shearing interferometer 120 sets to receive diffraction light D, and diffraction light D is converted into the first light beam L1
With the second light beam L2, wherein the first light beam L1 and the second light beam L2 are parallel to each other.In present embodiment, shearing interferometer 120 wraps
Containing reflective shearing flat board 122.That is, diffraction light D is to be converted to the first light parallel to each other through reflective shearing flat board 122
Beam L1 and the second light beam L2.Reflective shearing flat board 122 has parallel first surface S1 and second surface S2.Diffraction light D in
The first surface S1 of reflective shearing flat board 122 reflects and turns into the first light beam L1, and diffraction light D is in reflective shearing flat board 122
Second surface S2 reflect and turn into the second light beam L2.Optical receiver 108 is set to be carried with receiving reflective shearing flat board 122
For its first light beam L1 and the second light beam L2.
First lens 110 and the second lens 111 are arranged between full image storage device 102 and shearing interferometer 120, and from
Full image storage device 102 marches to the diffraction light D of optical receiver 108 sequentially by the first lens 110 and the second lens 111.
Low pass filter 104 is arranged between the first lens 110 and the second lens 111.Low pass filter 104 has unthreaded hole 105, unthreaded hole
105 size between optical receiver 108 1X1 minimum picture element units to optical receiver 108 4X4 minimum picture element lists
Between position.Low pass filter 104 to make by diffraction light D be left the noise of relatively low spatial frequency, to increase full figure
Accuracy of the device 100 to the digital independent of disc 106 (see Fig. 2A and Fig. 2 B).
Referring to Fig. 1, Fig. 3 A and Fig. 3 B.Fig. 3 A illustrate the first light beam L1 of the 1st figure on optical receiver 108
First areas imaging A1 schematic diagram.Fig. 3 B illustrate the second light beam L2 of the 1st figure in the second imaging model on optical receiver 108
Enclose A2 schematic diagram.
When reading light L after disc 106 produces diffraction and forms diffraction light D, diffraction light D can have (or carrying) to be stored in
The data of disc 106.Therefore, through shearing interferometer 120 by converted diffraction light D the first light beam L1 and the second light beam L2
Also having (or carry), this is stored in the data of disc 106.For parallel the first light beam L1 and the second light beam L2, the
Difference between one light beam L1 and the second light beam L2 is to have a range difference on the direction perpendicular to direct of travel each other.
After optical receiver 108 receives the first light beam L1 and the second light beam L2, the first light beam L1 and the second light beam L2 institutes
The data that disc 106 is stored in its (or carrying it) can be presented with the information unit lattice of phase representation, such as Fig. 3 A and Fig. 3 B
It is shown.
The method for reading data of the present invention can substantially be divided into three steps.First step is first by the first light beam L1 and the
Two light beam L2 are in the areas imaging that overlapping is formed on optical receiver 108.Second step is by the areas imaging of this overlapping, is obtained
To the first light beam L1 and the second light beam L2 in the intensity distribution form on optical receiver 108.Third step is to this intensity point
Cloth form carry out computing, to extrapolate the data that there is the first light beam L1 its (or carrying it) to be stored in disc 106, wherein this
Reckoning mode is to be calculated by known phase to the phase of unknown (or waiting to calculate).When the data that the first light beam L1 has
After the completion of content is calculated, being stored in the data content of disc 106 can be read out by full figure device 100.
It is the same as those described above, in order to be calculated by known phase to the phase of unknown (or waiting to calculate), full figure device 100
Can be first by the information record of initial reference signal point in disc 106.In present embodiment, when full figure device 100 is write
When, the light source module 114 of full image storage device 102 can provide signal light (not illustrating), and wherein light source module 114 provides it
Signal light has initial reference signal point.Therefore, when signal light in disc 106 when being write, can have been recorded in disc 106
The information of corresponding initial reference signal point.
Therefore, when full figure device 100 is read out, the diffraction light D formed in diffraction in disc 106 is passed through by reading light L
There can be the data point of corresponding initial reference signal point.By the diffraction light of this data point with corresponding initial reference signal point
D, the data content for being stored in disc 106 can be read out by full figure device 100 through calculating.It is described below will be to this hair
Bright method for reading data is further described.
In Fig. 3 A, the first light beam L1 that shearing interferometer 120 provides is the in the areas imaging on optical receiver 108
One areas imaging A1.First areas imaging A1 has the first data cells M.In present embodiment, the first areas imaging A1 can
To regard as the first areas imaging A1 that 8 row multiply 8 rows, and the first data cells M therein quantity is 64.
Every one first data cells M has first phase P1 or second phase P2.In the first imaging model that Fig. 3 A are painted
Enclose in A1, the first information unit lattice M of no shading is expressed as first phase P1, and the first information unit lattice M for having shading is expressed as
Second phase P2.First phase P1 can be 0 degree of phase, and second phase P2 can be 180 degree (π) phase.
For convenience of explanation, the first data cells M in Fig. 3 A represents in the method for similar matrix.For example, in
In first areas imaging A1 first row, the first data cells M can sequentially be represented as M11、M12、M13、M14、M15、M16、
M17、M18, wherein M11、M12、M14、M16、M18For first phase P1 (no shading), and M13、M15、M17(there is bottom for second phase P2
Line).Similarly, in the first areas imaging A1 secondary series, the first data cells M can sequentially be represented as M21、M22、M23、
M24、M25、M26、M27、M28, wherein M21、M23、M25、M26For first phase P1 (no shading), and M22、M24、M27、M28For the second phase
Position P2 (having shading).
In Fig. 3 B, the second light beam L2 that shearing interferometer 120 provides is the in the areas imaging on optical receiver 108
Two areas imaging A2, wherein the first areas imaging A1 and the rectangle that the second areas imaging A2 is identical size.Second areas imaging
A2 has the second data cells N.Due to the rectangle that the first areas imaging A1 and the second areas imaging A2 are identical size, second
Areas imaging A2 can also regard as the second areas imaging A2 that 8 row multiply 8 rows, and the second data cells N therein quantity
For 64.
Every one second data cells N also has first phase P1 or second phase P2.Similarly, painted in 3B figures
In second areas imaging A2, the second information unit lattice N of no shading is expressed as first phase P1, the second information unit for having shading
Lattice N is expressed as second phase P2.
The second data cells N in Fig. 3 B also represents in the method for similar matrix.For example, in the second areas imaging
In A2 first row, the second data cells N can sequentially be represented as N11、N12、N13、N14、N15、N16、N17、N18, wherein
N11、N12、N14、N16、N18For first phase P1 (no shading), and N13、N15、N17For second phase P2 (having shading).
In addition, be the same as those described above, due to that can record the information of corresponding initial reference signal point in disc 106, diffraction light D with
And the data point of corresponding initial reference signal point is respectively provided with by the first converted diffraction light D light beam L1 and the second light beam L2.
For example, in first areas imaging A1s of the first light beam L1 on optical receiver 108, the first data cell
Lattice M11、M12、M13、M14、M15、M16、M17、M18It can be the data point of corresponding initial reference signal point.For convenience of explanation,
One data cells M11、M12、M13、M14、M15、M16、M17、M18On be labeled with initial reference signal point R.
Similarly, in second areas imaging A2s of the second light beam L2 on optical receiver 108, the second data cells
N11、N12、N13、N14、N15、N16、N17、N18Also the data point of corresponding initial reference signal point is had.For convenience of explanation, second
Data cells N11、N12、N13、N14、N15、N16、N17、N18On be labeled with initial reference signal point R.
In other words, in the first areas imaging A1 and the second areas imaging A2, the first data cells M11、M12、M13、M14、
M15、M16、M17、M18With the second information unit lattice N11、N12、N13、N14、N15、N16、N17、N18Phase be, it is known that and remaining
One information unit lattice M and the second information unit lattice N phase is unknown.
The full figure device 100 that Fig. 4 A and Fig. 4 B illustrate Fig. 1 is read out the first light beam L1 and the second light beam L2 schematic diagram.
In Fig. 4 A and Fig. 4 B, the first depicted areas imaging A1 and the second areas imaging A2 correspond respectively to the first of Fig. 3 A and Fig. 3 B
Areas imaging A1 and the second areas imaging A2.In addition, in order to not make schema excessively complicated, the second areas imaging A2 is with dotted border
Represent.
It is the same as those described above, diffraction light D can be converted to the first light beam L1 and second (see Fig. 1) through shearing interferometer 120
Light beam L2, and form the first areas imaging A1 and the second areas imaging respectively at imaging on optical receiver 108 (see Fig. 1)
A2, such as foregoing first step.In Fig. 4 A and Fig. 4 B, the first light beam L1 and the second light beam L2 is formed on optical receiver 108
The first areas imaging A1 and the second areas imaging A2 for part overlap.
When the first areas imaging A1 on optical receiver 108 and the second areas imaging A2 parts overlap, in the first one-tenth
As scope A1 and the second areas imaging A2 overlapping region in, the first areas imaging A1 and the second areas imaging A2 overlaps every
One first data cells M can be completely superposed with every one second information unit lattice N.For example, the first areas imaging A1 secondary series
The first data cells M (corresponding the first data cells M to 3A figures21、M22、M23、M24、M25、M26、M27、M28) respectively
With the second data cells N (corresponding the second data cells N to 3B figures of the second areas imaging A2 first row11、N12、
N13、N14、N15、N16、N17、N18) be completely superposed.
Then, data reading method be according to the first areas imaging A1 with it is complete in the region of the second areas imaging A2 overlappings
Full weight close the first information unit lattice M and the second information unit lattice N, the first light beam L1 that shearing interferometer 120 is provided and
Second light beam L2 is converted to intensity distribution form through interference from phase distribution form, and is recorded in the form of the intensity signals, such as
Foregoing second step.
In by the first light beam L1 and the second light beam L2 through interference from phase distribution form be converted to intensity distribution form it
Had steps of in step, the step of conversion.The first data cells M being completely superposed when each group and the second data cell
Lattice N is all first phase P1 or second phase P2, defines the first data cells M and the second data cell that this group is completely superposed
Lattice N is the first intensity in the intensity of optical receiver 108.The numbers of the first data cells M being completely superposed when each group and second
When according to cell N being respectively first phase P1 with second phase P2, the first data cells M that this group is completely superposed and the is defined
Two data cells N are the second intensity in the intensity of optical receiver 108.
In other words, the first light beam L1 and the second light beam L2 is converted to intensity distribution form through interference from phase distribution form
Step be through the phase relation definition between the first data cells M and the second data cells N that are completely superposed.Phase
Relation is, for example, the Constructive interaction or destructive interference between the first data cells M and the second data cells N.Citing
For, when the first data cells M and the second data cells N of coincidence have same phase, its phase relation can regard
For Constructive interaction.Conversely, when the first data cells M and the second data cells N of coincidence have opposite phase, its phase
Position relation can be considered as destructive interference.
In present embodiment, the intensity signals after conversion are explained exemplified by being recorded in the form of binary, that is, are changed
First intensity possessed by the intensity distribution form formed can be considered as 1 with 0 respectively with the second intensity.In by the first light beam L1 with
Second light beam L2 through interference from during phase distribution form is converted to the step of intensity distribution form, method for reading data
It is to make to subtract each other to define the intensity of each data by the first data cells M of coincidence and the second data cells N phase.
For example, when the phase of one group of information unit lattice of coincidence is π and 0 (or 0 and π), the intensity of this group of data cells is determined
Justice is 1.When the phase of one group of information unit lattice of coincidence is all π (π and π) or is all 0 (0 and 0), this group of data cells it
Strength definition is 0.
When optical receiver 108 is converted to the first light beam L1 and the second light beam L2 by force through interference from phase distribution form
After spending distribution form, intensity distribution form and corresponding initial reference signal point R through the first light beam L1 and the second light beam L2 it
Data point, you can calculate the phase of every one first data cells M in the first areas imaging A1, such as foregoing third step.
Look at Fig. 4 A signified part of arrow (the first of the first areas imaging A1 secondary series and the second areas imaging A2
Row), in herein, optical receiver 108 (will correspond to extremely because of the first data cells M of the first areas imaging A1 secondary series
First data cells M of 3A figures21、M22、M23、M24、M25、M26、M27、M28) with the second areas imaging A2 first row the
Two data cells N (corresponding the second data cells N to 3B figures11、N12、N13、N14、N15、N16、N17、N18) complete respectively
Ground overlaps, and the data cells in diverse location receive multiple intensity signals.For example, optical receiver 108 is connected to by M21
With N11Intensity, M after superposition22With N12Intensity, M after superposition23With N13Intensity, M after superposition24With N14Intensity after superposition,
M25With N15Intensity, M after superposition26With N16Intensity, M after superposition27With N17Intensity, M after superposition28With N18It is strong after superposition
Degree is respectively 0,1,1,1,1,0,0,1.
Because the phase of the second information unit lattice N in the second areas imaging A2 first row (is marked with initial to be known
Reference signal point R), the operation rule subtracted each other through phase, the first data cells M in the first areas imaging A1 secondary series
Phase can be calculated out.
For example, due to M21With N11In in place of superposition, due to M21With N11Intensity after superposition is 0, therefore can push away to obtain M21
With N11Phase it is identical.Then, due to N11Phase be known and be 0 phase, therefore M21Phase can be calculated as 0 phase
Position.
Conversely, as M22With N12Intensity after superposition is 1, therefore can push away to obtain M21With N11Phase it is different.Then, by
In N11Phase be known and be 0 phase, therefore M21Phase can be calculated as π phases.It is regular by this reckoning, first
The phase of the first data cells M in areas imaging A1 secondary series can be calculated out.
Similarly, after the phase of the first information unit lattice M in the first areas imaging A1 secondary series is calculated out,
Because the first areas imaging A1 is identical with the second areas imaging A2 phase distribution, therefore it can learn the second areas imaging A2's
The phase of the second information unit lattice N in secondary series.
Then, Fig. 4 B signified part of arrow (the first areas imaging A1 the 3rd row and the second areas imaging A2 is looked at
Secondary series), in herein, the first areas imaging A1 the 3rd row in the first data cells M and the second areas imaging A2
Secondary series in the second information unit lattice N represented respectively completely overlap.
Optical receiver 108 is connected to by M31With N21(do not indicate, the first data cells M of 3A figures with the 3rd figure it
Second data cells N marking mode such as matrix rule) intensity after superposition, M32With N22Intensity, M after superposition33With N23Repeatedly
Intensity, M after adding34With N24Intensity, M after superposition35With N25Intensity, M after superposition36With N26Intensity, M after superposition37With N27
Intensity, M after superposition38With N28Intensity after superposition is respectively 0,1,1,1,0,1,1,0.Rule is calculated according to foregoing, due to this
The phase of the second data cells N in the intensity distribution at place and the second areas imaging A2 secondary series is, it is known that therefore
The phase of the first data cells M in one areas imaging A1 the 3rd row can be calculated out.
Specifically, among present embodiment, the phase of every one first data cells M in the first areas imaging A1 is calculated
The step of position is following steps.Corresponded to since in the first data cells M the one of initial reference signal point R data point to
Each group of the first data cells M being completely superposed and the second data cells N of others is calculated.In other words, due to this
The phase of the first data cells M in first areas imaging A1 of embodiment first row is, it is known that therefore calculating first
The phase of other first data cells M in areas imaging A1 is sequentially calculated from first row to secondary series, the 3rd row, the 4th
Row, the 5th row, the 6th row, the 7th row and the 8th row.
In summary, the method for reading data of the present invention can be passed through after the first light beam L1 and the second light beam L2 overlaps and formed
The form that overlapping area, wherein optical receiver 108 receive this overlapping area is intensity distribution form.Then, through first
Light beam L1 and the second light beam L2 are corresponding initial in the first areas imaging A1 and the second areas imaging A2 on optical receiver 108
Reference signal point R data point, the first areas imaging A1 the first data cells M phase can be by the number of known phase
Strong point is calculated out.
After the first areas imaging A1 the first data cells M phase is calculated out, full figure device 100 is i.e. readable
Take out data stored in disc 106.Through the method for reading data of the present invention, optical receiver 108 is carried out to diffraction light D
Reading once can read out the phase information stored by disc 106 so that when full figure device 100 takes to the Read of disc 106
Between be shortened.Furthermore the Reng Ke Read in the case that Suo Duan Read take the time of full figure device 100 go out the data of high quality, therefore full figure
The read performance of device 100 is substantially improved with efficiency.
Further, since the first light beam L1 and the second light beam L2 is with a branch of diffraction light before being sheared interferometer 120 and changing
In D, the reckoning rule subtracted each other by phase, the first light beam L1 and the second light beam L2 because optical module aberration or disc skew
Caused noise can be eliminated in progress destructive interference, use the miscellaneous ratio of news of lifting full figure device 100.
It should be appreciated, however, that the reckoning rule that phase provided above is subtracted each other is only to illustrate, and it is not used to limit this hair
Bright, persond having ordinary knowledge in the technical field of the present invention can be according to being actually needed, and elasticity selection calculates rule, to define weight
The intensity signals of areas imaging repeatedly.For example, the intensity signals of the areas imaging to overlap can pass through phase mutually calculates rule in addition
Then define.
Fig. 5 A to Fig. 5 I have initial reference by what the full image storage device 102 among Fig. 1 full figure device 100 provided
Signal point R signal light is in the schematic diagram of multiple embodiments.
According to foregoing, in Fig. 3 A, the first areas imaging A1 the first data cells M phase is by known phase
Data point is calculated out.Initial reference signal point R position possessed by Fig. 3 A signal light corresponding with Fig. 3 B is positioned at imaging
First row in scope, but initial reference signal point R position can be located at according to different designs possessed by signal light
Diverse location, as shown in Fig. 5 A to Fig. 5 H.Among the initial reference signal point R of difference configuration mode, when the initial ginseng of increase
When examining signal point R quantity, the degree of accuracy that full figure device is read to disc can be increased.
In Fig. 5 A, initial reference signal point R possessed by signal light is one, and among single data point.Fig. 5 B
In, initial reference signal point R possessed by signal light is multiple, and among multiple data points.In Fig. 5 C, signal light is had
Some initial reference signal point R are multiple, and among same a line of areas imaging.In Fig. 5 D, possessed by signal light just
Beginning reference signal point R is multiple, and positioned at wherein two rows of areas imaging.In Fig. 5 E, initial reference possessed by signal light is interrogated
Number point R is multiple, and among the diagonal online data point of areas imaging.In Fig. 5 F, initially join possessed by signal light
Signal point R is examined to be multiple, and is configured in a staggered manner.In Fig. 5 A, initial reference signal point R is more possessed by signal light
It is individual, and among a block of areas imaging.In Fig. 5 H, initial reference signal point R possessed by signal light is multiple, and
It is configured in side-by-side fashion among data point.
According to the quantity and arrangement mode of initial reference signal point R possessed by signal light, the first light beam L1 and the second light
Beam L2 can have different overlapping manners in the first areas imaging A1 on optical receiver 108 from the second areas imaging A2, its
In the first areas imaging A1 and the second areas imaging A2 overlapping area can be adjusted through shearing interferometer 120.
For example, in Fig. 4 A and Fig. 4 B, the first light beam L1 and the second light beam L2 are in the first imaging model on optical receiver 108
It is to differ a distance arranged (or one data cells of difference) to enclose A1 with the second areas imaging A2.In some embodiments
In, shearing interferometer 120 sets lateral separation difference or longitudinal direction so that between the first areas imaging A1 and the second areas imaging A2
Range difference is the integral multiple of the minimum picture element unit of optical receiver 108.
In addition, can also there are simultaneously between the first areas imaging A1 and the second areas imaging A2 lateral separation it is poor with it is vertical
To range difference, as shown in fig. 5i.In Fig. 5 I, fore-and-aft distance difference V between the first areas imaging A1 and the second areas imaging A2 be present
With lateral separation difference H.Lateral separation difference H and fore-and-aft distance difference V ratio is the tangent value of angle, θ, and wherein angle, θ is more than or waited
In 0 degree and less than or equal to 90 degree.
Fig. 6 is refer to, Fig. 6 illustrates the light path schematic diagram of the full figure device 100 of the second embodiment of the present invention.This implementation
The difference of mode and first embodiment is that the full figure device 100 of present embodiment further includes afocal system 126.
When diffraction light D is to be converted to the first light beam L1 and the second light beam L2 through reflective shearing flat board 122, the first light
Beam L1 and the second light beam L2 is produced through first surface S1 and second surface the S2 reflection of reflective shearing flat board 122 respectively
It is raw.Due to there are a spacing between the first surface S1 and second surface S2 of reflective shearing flat board 122 so that the first light beam
Between L1 and the second light beam L2 the problem of out of focus is might have in the imaging relations on optical receiver 108.
Afocal system 126 is arranged between shearing interferometer 120 and optical receiver 108, wherein afocal system 126 to
The the first light beam L1 and the second light beam L2 that diminution shearing interferometer 120 provides are in the imaging on optical receiver 108.This implementation
In mode, afocal system 126 can be considered as a diminution imaging system.Reduced through afocal system 126 in optical receiver 108
On imaging, the first light beam L1 and the second light beam L2 can effectively be prevented from possible problem out of focus on optical receiver 108.
Furthermore because the first light beam L1 and the second light beam L2 in the magnifying power on longitudinal direction (optical axis direction of parallel afocal system 126) are
Laterally the magnifying power on (optical axis direction of vertical afocal system 126) square times, therefore, the first light beam L1 and the second light beam L2
Phase offset (piston phase shift) between the imaging on optical receiver 108 can't be impacted.
Fig. 7 illustrates the light path schematic diagram of the full figure device 100 of the 3rd embodiment of the present invention.Present embodiment and first
The difference of embodiment is that the shearing interferometer 120 of the full figure device 100 of present embodiment includes penetration shearing flat board
124。
In Fig. 7, the diffraction light D that full image storage device 102 provides is through the first lens 110, low pass filter 104 and second
Lens 111 are incident to the first speculum 109, and then diffraction light D reflexes to penetration shearing flat board 124 by the first speculum 109.
In present embodiment, the diffraction light D through penetration shearing flat board 124 will turn into the first light beam L1, and sequentially self-gating formula is cut
The second light beam L2 will be turned into by cutting flat with the diffraction light D of first surface S1 and second surface the S2 reflection of plate 124.Then, the first light beam
L1 and the second light beam L2 abreast enters optical receiver 108.
Further, since a spacing is there are between the first surface S1 and second surface S2 of penetration shearing flat board 124, because
Between this first light beam and the second light beams of L1 L2 the problem of out of focus is might have in the imaging relations on optical receiver 108.For
The problem of anti-out of focus here, afocal system (not illustrating) can be arranged at shearing interferometer 120 and optical receiver 108 it
Between.Similarly, afocal system connects to reduce the first light beam L1 and the second light beam L2 that shearing interferometer 120 provides in optics
The imaging on device 108 is received, effectively to prevent problem out of focus.
Fig. 8 illustrates the configuration schematic diagram of the full figure device 100 of the 4th embodiment of the present invention.Present embodiment and first
The difference of embodiment is that the shearing interferometer 120 of present embodiment is made up of transparency carrier 128 and dielectric layer 130, so
And the shearing interferometer 120 of first embodiment is shearing flat board.
Shearing interferometer 120 includes transparency carrier 128 and dielectric layer 130.Transparency carrier 128 has relative and not parallel
First surface S1 and second surface S2.Dielectric layer 130 is arranged at first surface S1 and parallel with first surface S1.
In present embodiment, after diffraction light D enters shearing interferometer 120, in the diffraction light D's that dielectric layer 130 reflects
The first light beam L1 will be turned into, in penetrate dielectric layer 130 and between dielectric layer 130 and transparency carrier 128 interface reflection around
The second light beam L2 will be turned into by penetrating light D.Through the characteristic of adjustment dielectric layer 130, full figure device 100 can be lifted when digital independent
Accuracy.For example, foregoing mentioned issuable problem out of focus can pass through the thickness of adjustment dielectric layer 130 and prevent
Only.Furthermore through the reflectivity of adjustment dielectric layer 130, the first light beam L1 and the second light beam L2 interference contrast can obtain
Lifting.
Furthermore, the thickness of dielectric layer 130 can be by the first light beam L1 and the second light beam L2 in optical receiver 108
Phase difference, the light source module of the distance between areas imaging on (see the 1st figure) difference, the first light beam L1 and the second light beam L2
114 wavelength provided (see the 1st figure), the refractive index of dielectric layer 130 and the setting angle of shearing interferometer 120 determine.
Relation between above-mentioned each parameter is as shown in following equation：
……………………………(1)
………………………………(2)
Wherein λ0For the wavelength of incident light, w be the first light beam L1 and the second light beam L2 on optical receiver 108 into
As the phase difference of the distance between scope difference, ψ between the first light beam L1 and the second light beam L2；T is the thickness of dielectric layer 130；
θ0For the incidence angle of light beam；θ1For refraction angle of the light beam in dielectric layer 130；n1For the refractive index of dielectric layer 130；n0For
The refractive index of air.
It is 5 μm when the distance between the areas imaging of the first light beam L1 and the second light beam L2 on optical receiver 108 is poor,
Then w minimums, which need to be 5 μm, can just be resolved conoscope image.In condition w be 5 μm, λ0For 405nm, n1For 1.56, n0For
1st, in the case that ψ is (2N-1) π, and N is just whole Number, according to equation formula (I) and (II), can calculate：
Wherein,.That is, when incidence angle is
At 41.6 ° ± 0.2 °, the first light beam L1 and the second light beam L2 phase difference is about the π of π ± 0.1, and dielectric layer 130
Thickness be 7 microns (μm).In other words, in some embodiments, the thickness of dielectric layer 130 is more than 0 micron (μm) and is less than
Or equal to 10 microns (μm).
Further, since transparency carrier 128 has first surface S1 relative to each other and not parallel and second surface S2, diffraction
Ghosts of the light D produced by among shearing interferometer 120 can effectively be separated, as shown in light beam L3, L4, L5 and L6.Due to
The noise produced by ghost can be effectively eliminated, and accuracy of the full figure device 100 when digital independent is also lifted.
Fig. 9 illustrates the light path schematic diagram of the full figure device 100 of the 5th embodiment of the present invention.Present embodiment and the 4th
The difference of embodiment is that the full figure device 100 of present embodiment further includes afocal system 126.
According to aforementioned formula (I), between the areas imaging of the first light beam L1 and the second light beam L2 on optical receiver 108
The thickness T of range difference and dielectric layer 130 be proportional relation.To maintain dielectric layer 130 thickness it is constant in the case of, increase
Add the distance between the areas imaging of the first light beam L1 and the second light beam L2 on optical receiver 108 poor, then can pass through and put
Big imaging system increases this range difference.
Afocal system 126 is arranged between shearing interferometer 120 and optical receiver 108, wherein afocal system 126 to
The the first light beam L1 and the second light beam L2 that amplification shearing interferometer 120 provides are in the imaging on optical receiver 108.That is,
Afocal system 126 can be considered as an amplification imaging system.
Through afocal system 126, the first light beam L1 and the second light beam L2 are in the first areas imaging on optical receiver 108
The distance between second areas imaging can be adjusted.Furthermore because dielectric layer 130 can be considered as thin film, therefore
Caused problem out of focus can be ignored between first light beam L1 and the second light beam L2.
Figure 10 A illustrate the light path schematic diagram of the full figure device 100 of the 6th embodiment of the present invention.Figure 10 B illustrate Figure 10 A
Raster unit 136 configuration schematic diagram.The difference of present embodiment and first embodiment is, the shearing of present embodiment
Interferometer 120 is made up of the first convergent lens 132, the second convergent lens 134 with raster unit 136.
First convergent lens 132 and the second convergent lens 134 are arranged at full image storage device 102 and optical receiver 108
Between, and from full image storage device 102 march to the diffraction light D of optical receiver 108 sequentially by the first convergent lens 132 with
Second convergent lens 134.Raster unit 136 is arranged between the first convergent lens 132 and the second convergent lens 134.Grating list
Member 136 includes the first grating 138 and the second grating 140.Second grating 140 be arranged in parallel with the first grating 138, and from the first meeting
Poly- lens 132 march to the diffraction light D of the second convergent lens 134 sequentially by the first grating 138 and the second grating 140.
In Figure 10 B, when diffraction light D passes through the first grating 138, diffraction light D can be converted into light beam L7 and L8.Work as light beam
When L7 and L8 pass through the second grating 140, light beam L7 can be converted to light beam L9 and L10, wherein the first light beam L1 be by light beam L9 and
L10 is formed.When light beam L8 passes through the second grating 140, light beam L8 can be converted to light beam L11 and L12, wherein the second light beam L2
To be made up of light beam L11 and L12.
When full image storage device 102 provides inclined diffraction light D (optical axis for favouring the first convergent lens 132) to first
During convergent lens 132, diffraction light D can be directed to raster unit 136 by the first convergent lens 132.Then, when raster unit 136
After the first light beam L1 and the second light beam L2 provided is directed to optical receiver 108 through the second convergent lens 134, the first light
Beam L1 and the second light beam L2 can be in being imaged and form the first areas imaging and the second areas imaging respectively on optical receiver 108.
In present embodiment, through the level between the first grating 138 and the second grating 140 of adjustment raster unit 136
Distance, thus it is possible to vary the relation of the distance between the first light beam L1 and the second light beam L2 difference.In addition, through adjustment raster unit
136 the first grating 138 and the vertical range of the second grating 140, thus it is possible to vary between the first light beam L1 and the second light beam L2
Phase difference.
Figure 11 A illustrate the light path schematic diagram of the full figure device 100 of the 7th embodiment of the present invention.Figure 11 B illustrate Figure 11 A
Raster unit 136 configuration schematic diagram.The difference of present embodiment and the 6th embodiment is, the grating of present embodiment
Unit 136 includes tilting grating 142 (blazed grating).
In present embodiment, diffraction light D can pass through the light beam that tilting grating 142 produces not same order, by diffraction light D
Be converted to the first light beam L1 and the second light beam L2.In addition, full image storage device 102 is to provide parallel diffraction light D (parallel to
The optical axis of one convergent lens 132) to the first convergent lens 132.
Figure 12 illustrates the light path schematic diagram of the full figure device 100 of the 8th embodiment of the present invention.Present embodiment and the
The difference of six embodiments is that the raster unit 136 of present embodiment includes the (double of bifrequency formula grating 144
frequency grating)。
In present embodiment, the Two kind spatial frequencys that diffraction light D can be passed through on bifrequency formula grating 144 are converted to first
Light beam L1 and the second light beam L2.In addition, this Two kinds spatial frequency is controlled to change the first light beam L1 and the second light beam L2 phase
Potential difference.
In summary, diffraction light is converted to the first light beam and the second light by the full figure device of the present invention through shearing interferometer
Beam.First light beam and the second light beam form the form of overlapping area, wherein this overlapping area after optical receiver portion overlapping
For intensity distribution form.Through the first light beam and the second light beam in the first areas imaging on optical receiver and the second imaging model
The data point of middle corresponding initial reference signal point is enclosed, the phase of the first data cells of the first areas imaging can be by known
The data point of phase is calculated out.After the phase of the first data cells of the first areas imaging is calculated out, full figure
Device can read out data stored in disc.
Through the method for reading data of the present invention, the reading that optical receiver is carried out once to diffraction light can read placing
Phase information stored by piece so that disc Read take the time to be shortened.Furthermore full figure is installed on the situation that Suo Duan Read take the time
Lower Reng Ke Read go out the data of high quality, therefore the read performance of full figure device is substantially improved.
In addition, the first light beam and the second light beam are in the first areas imaging and the second areas imaging on optical receiver
Overlapping area can pass through shearing interferometer and adjust, use and coordinate different full figure device designs.In addition, full figure device has
Afocal system, afocal system are set to be used as diminution imaging system or amplification imaging system so that the first light beam and the second light beam
It can be adjusted in the imaging on optical receiver, effectively to prevent problem out of focus with suppressing noise.
Although the present invention is disclosed above with embodiment, so it is not limited to the present invention, any to be familiar with this skill
Person, without departing from the spirit and scope of the invention, when can make various changes with retouching, therefore the protection domain of the present invention ought
It is defined depending on rear attached claim institute defender.
Claims (20)
1. a kind of full figure device, comprising：
One full image storage device, set and read light to a disc to provide one, so that the reading light turns into after the disc diffraction
One diffraction light；
One shearing interferometer, is set to receive the diffraction light, and the diffraction light is converted into one first light beam and one second light beam,
Wherein first light beam and second light beam is parallel to each other；And an optical receiver, set to receive the shearing interferometer institute
First light beam of offer and second light beam, it is characterised in that：First light beam that wherein shearing interferometer provides with
Second light beam is respectively one first areas imaging and one second areas imaging in the areas imaging on the optical receiver, and this
One areas imaging has identical size, and first areas imaging and the second areas imaging part weight with second areas imaging
Repeatedly.
2. full figure device according to claim 1, it is characterised in that wherein the full image storage device includes a light source die
Block, the light source module are set to provide a signal light, and the signal light that wherein light source module provides has an initial reference
Signal point.
3. full figure device according to claim 1, it is characterised in that wherein it is flat to include reflective shearing for the shearing interferometer
Plate or penetration shearing flat board.
4. full figure device according to claim 3, it is characterised in that further include an afocal system, be arranged at the shearing and do
Between interferometer and the optical receiver, wherein the afocal system to reduce first light beam that the shearing interferometer provides with
Second light beam is in the imaging on the optical receiver.
5. full figure device according to claim 1, it is characterised in that wherein the shearing interferometer includes：One transparency carrier,
With relative and not parallel a first surface and a second surface；And a dielectric layer, be arranged at the first surface and with this
First surface is parallel.
6. full figure device according to claim 5, it is characterised in that wherein the thickness of the dielectric layer is more than 0 micron and small
In or equal to 10 microns.
7. full figure device according to claim 5, it is characterised in that further include an afocal system, be arranged at the shearing and do
Between interferometer and the optical receiver, wherein the afocal system to amplify first light beam that the shearing interferometer provides with
Second light beam is in the imaging on the optical receiver.
8. full figure device according to claim 1, it is characterised in that further include one first lens；One second lens, this
One lens and second lens are arranged between the full image storage device and the shearing interferometer, and from the full image storage device row
The diffraction light of the shearing interferometer is proceeded to sequentially by first lens and second lens；And a low pass filter, if
It is placed between first lens and second lens, wherein the low pass filter has a unthreaded hole, and the size of the unthreaded hole is between this
1X1 minimum picture element units of optical receiver are between 4X4 minimum picture element units of the optical receiver.
9. full figure device according to claim 1, it is characterised in that wherein first areas imaging and the second imaging model
It is poor with a lateral separation to there is fore-and-aft distance difference between enclosing, wherein the lateral separation is poor and the ratio of the fore-and-aft distance difference is one
The tangent value of angle, the wherein angle are more than or equal to 0 degree and less than or equal to 90 degree.
10. full figure device according to claim 1, it is characterised in that wherein the shearing interferometer set so that this first
Lateral separation difference or the poor minimum picture element for the optical receiver of fore-and-aft distance between areas imaging and second areas imaging
The integral multiple of unit.
11. full figure device according to claim 1, it is characterised in that wherein the shearing interferometer is assembled saturating by one first
Mirror, one second convergent lens and a raster unit form, and first convergent lens is arranged at the full figure with second convergent lens
Between storage device and the optical receiver, and the diffraction light of the optical receiver is marched to sequentially from the full image storage device
By first convergent lens and second convergent lens, the raster unit is arranged at first convergent lens and second convergence
Between lens.
12. full figure device according to claim 11, it is characterised in that wherein the raster unit includes：One first grating；
And one second grating, set with first parallel gratings, and from first convergent lens march to second convergent lens it
The diffraction light sequentially passes through first grating and second grating.
13. full figure device according to claim 11, it is characterised in that wherein the raster unit include tilting grating or
Bifrequency formula grating.
14. a kind of method for reading data of full figure device, include through a full image storage device and one signal light a to disc be provided,
Wherein the signal light has an initial reference signal point so that in the disc record have to should initial reference signal point letter
Breath；One is provided through the full image storage device and reads light to the disc so that the reading light is formed after the disc produces diffraction
One diffraction light, wherein the diffraction light have to should one of initial reference signal point data point；
The diffraction light is converted to one first light beam and one second light beam parallel to each other through a shearing interferometer；And guiding
First light beam and second light beam a to optical receiver, wherein first light beam are with second light beam in the optical receiver
Upper areas imaging is respectively one first areas imaging and one second areas imaging, and first areas imaging second is imaged model with this
Enclose with identical size, and first areas imaging overlaps with the second areas imaging part.
15. method for reading data according to claim 14, it is characterised in that wherein first areas imaging has plural number
Individual first data cells, those each first data cells have a first phase or a second phase, second imaging
Scope has a plurality of second data cells, and those each second data cells have the first phase or second phase
Position, wherein in those each first data cells in the region of first areas imaging and the second areas imaging overlappings and
Those each second data cells are completely superposed.
16. method for reading data according to claim 15, it is characterised in that also include according to first areas imaging with
Those first data cells being completely superposed and those second data cells in the region of the second areas imaging overlapping,
First light beam that the shearing interferometer is provided is converted to intensity through interference with second light beam from phase distribution form
Distribution form.
17. method for reading data according to claim 16, it is characterised in that wherein by first light beam and second light
Beam is converted to the step of intensity distribution form from phase distribution form through interference and further included, be completely superposed when each group this
When one data cells and second data cells are all the first phase or the second phase, define the group and be completely superposed it
First data cells and second data cells are one first intensity in the intensity of the optical receiver；And when each
When first data cells and second data cells that group is completely superposed are respectively the first phase and the second phase,
Define first data cells that the group is completely superposed and second data cells in the intensity of the optical receiver be one
Second intensity.
18. method for reading data according to claim 16, it is characterised in that further include, by first light beam and this
Two light beams are from after phase distribution form is converted to intensity distribution form, through the intensity distribution of first light beam and second light beam
Form with to should initial reference signal point the data point, calculate those each first data sheets in first areas imaging
The phase of first lattice.
19. method for reading data according to claim 18, it is characterised in that wherein calculate in first areas imaging
The step of the phase of those each the first data cells further includes, from those first data cells to should initial reference
The one of the data point of signal point starts to other each group of first data cells being completely superposed and second number
Calculated according to cell.
20. method for reading data according to claim 14, it is characterised in that wherein first areas imaging with this second
It is poor with a lateral separation to there is fore-and-aft distance difference between areas imaging, wherein the ratio between lateral separation difference and the fore-and-aft distance difference
It is worth and is more than or equal to 0 degree for the tangent value of an angle, the wherein angle and less than or equal to 90 degree.
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| CN110060706B (en) * | 2018-01-18 | 2021-03-19 | 青岛泰谷光电工程技术有限公司 | Holographic information reading device and method |
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| US5339305A (en) * | 1992-08-14 | 1994-08-16 | Northrop Grumman Corporation | Disk-based optical correlator and method |
| US5446710A (en) * | 1992-11-06 | 1995-08-29 | International Business Machines Corporation | Focus error detection using an equal path length lateral shearing interferometer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5339305A (en) * | 1992-08-14 | 1994-08-16 | Northrop Grumman Corporation | Disk-based optical correlator and method |
| US5446710A (en) * | 1992-11-06 | 1995-08-29 | International Business Machines Corporation | Focus error detection using an equal path length lateral shearing interferometer |
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