CN101520637B - Fabrication process for computer-generated holograms and record medium - Google Patents
Fabrication process for computer-generated holograms and record medium Download PDFInfo
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- CN101520637B CN101520637B CN 200910118725 CN200910118725A CN101520637B CN 101520637 B CN101520637 B CN 101520637B CN 200910118725 CN200910118725 CN 200910118725 CN 200910118725 A CN200910118725 A CN 200910118725A CN 101520637 B CN101520637 B CN 101520637B
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Abstract
The invention provides a fabrication process for a computer-generated hologram 1 wherein amplitude information and phase information are recorded on a given recording surface by means of computation by a computer. The computer-generated hologram 1 is characterized by having a first direction X and a second direction Y orthogonal to the first direction X, and parallax in the first direction X alone. The hologram 1 comprises unit areas B1, B2, B3 to Bm to BM, each one having a given width in the second direction Y. In each unit area B1, B2, B3 to Bm to BM, there is a diffraction pattern having aspatial frequency Cm1, Cm2, Cm3 to Cmt to CmT that varies in the second direction.
Description
Technical field
The present invention relates to the method for making of computer-generated hologram and the computer-generated hologram of making by the method and computer-generated hologram.
Always, knownly for false proof, on bank note or credit card etc., hologram is set.As this hologram, have and form the computer-generated hologram (CGH) (with reference to patent documentation 1) that interference fringe is made by computed computing on the record surface of regulation.
[patent documentation 1] Japanese Patent Application Publication 2001-013858 communique
No. 3810917 communiques of [patent documentation 2] Jap.P.
[patent documentation 3] Japanese Patent Application Publication 2000-214750 communique
[patent documentation 4] Japanese Patent Application Publication 2002-72837 communique
[patent documentation 5] Japanese Patent Application Publication 2005-215570 communique
[patent documentation 6] Japanese Patent Application Publication 2004-309709 communique
[patent documentation 7] Japanese Patent Application Publication 2004-264839 communique
[non-patent literature 1] A.W.Lohmann and D.P.Paris: " Binary Fraunhofer Holograms, Generated by Computer ", Appl.Opt., 6,10, pp.1739-1748 (Oct.1967)
[non-patent literature 2] Wai Hon Lee: " Sampled Fourier Transform Hologram Generated by Computer " .Appl.Opt., 9,3, pp.639-643 (Mar.1970)
But, the computer-generated hologram of above-mentioned patent documentation 1, although calculated load is little, the ken is narrow longitudinally.For example, Figure 17 and Figure 18 mean the figure of prior art.Figure 17 is illustrated in the outboard profile in the situation of irradiating the regeneration illumination light 102a formed with monochromatic light on computer-generated hologram 101.As shown in figure 17, the diffraction light 103 occurred from the unit area of epimere is not to the direction diffraction of viewpoint E.Therefore can not observe the reproduced picture of the epimere part of computer-generated hologram 101 in the position of viewpoint E, the ken can not be expanded longitudinally.In addition, Figure 18 means the situation of to computer-generated hologram 101, irradiating the regeneration illumination light 102b formed with white light.As shown in figure 18, although irradiate the regeneration illumination light 102b formed with white light, yet the constituent parts zone is only visible monochromatic.For example, in the diffraction light 103 occurred at the unit area from epimere, towards the light of the direction of viewpoint E, be the blue composition B in the white light 102b of incident.Therefore, in the position of viewpoint E, the reproduced picture of the epimere part of computer-generated hologram 101 is observed to blue B.In addition, middle body is observed to green G, and hypomere partly is observed to red R (not shown).
Have again, disclose in patent documentation 2 by using the light source of pointolite as the object light from original image, thereby there is the technology of the ken of above-below direction (vertically).In the disclosed technology of patent documentation 2, object light becomes the spherical wave of the pointolite expansion from original image, the ken expansion of above-below direction.But, because on above-below direction the posting field of restriction hologram record face, so according to the depth position of object and the ken of above-below direction changes.
Summary of the invention
The present invention is the invention of making in view of the such problem of prior art, its objective is a kind of easy observation and the method for making of the good computer-generated hologram of security and the computer-generated hologram of making by the method are provided.
The method of making computd integral hologram of the present invention for achieving the above object, it is the method for making that records the computer-generated hologram of amplitude information and phase information formation by computed computing on the record surface of regulation, it is characterized in that, described computer-generated hologram, have: first direction, with the second direction with described first direction quadrature, have: the parallax on described first direction only, have: the constituent parts zone that there is Rack on described second direction, in described constituent parts zone, be produced on frequency different diffraction pattern in space on described second direction.
In addition, it is characterized in that, the different spatial frequency on second direction of described diffraction pattern gradually changes from a party in described unit area.
In addition, it is characterized in that, use the object light from being set in the pointolite recorded object, at described first direction, expanding, expand in described second direction from the position different from described pointolite to carry out record.
In addition, it is characterized in that, the object light of fixed width is expanded, is had in described second direction in use from being set in the line source recorded object at described first direction, and use and to carry out record with reference to light, describedly focused on reference to light position to the regulation of each decision of described unit area on described second direction.
In addition, it is characterized in that, described diffraction pattern consists of interference fringe.
In addition, it is characterized in that, described diffraction pattern consists of the figure of phase modulation and amplitude.
And then, it is characterized in that, computer-generated hologram is made by the method for making of described computer-generated hologram.
In addition, computer-generated hologram of the present invention for achieving the above object, to record the computer-generated hologram that amplitude information and phase information form on the record surface of regulation by computed computing, it is characterized in that, have: first direction and with the second direction of described first direction quadrature, have: the parallax on described first direction only, have: the constituent parts zone that there is Rack on described second direction, in described constituent parts zone, have: the different diffraction pattern of space frequency on described second direction.
In addition, it is characterised in that, states the different spatial frequency on second direction of diffraction pattern, in described unit area, from a party, gradually changes.
According to the present invention, the different mode making computd integral hologram of spatial frequency by the diffraction pattern only to there is parallax at first direction, second direction in unit area, the diffusion angle of the second direction of change diffraction light, therefore can be as the computer-generated hologram of the ken that has enlarged second direction.In addition because can with location-independent the expansion that determines the second direction of object light of object, so the ken of second direction can not change according to the depth position of object.And then, in the situation that use white light as the regeneration illumination light, can, when the ken enlarges, with white, observe reproduced picture.
The accompanying drawing explanation
Fig. 1 means the stereographic map of concept of the recording method of computer-generated hologram of the present invention.
Fig. 2 means the figure of concrete example of the concept of the calculation process based on Fig. 1.
Fig. 3 is the vertical view for the concept of the calculation process of key diagram 1.
Fig. 4 means the figure of structure of the CGH master of present embodiment.
Fig. 5 means the figure of concrete structure of the CGH master of present embodiment.
Fig. 6 means the figure of the state when CGH master of the embodiment 1 of present embodiment is made.
Fig. 7 means the stereographic map of the state when CGH master of the embodiment 1 of present embodiment is made.
Fig. 8 means the figure that the CGH master of embodiment 1 is irradiated to the situation of the regeneration illumination light formed with monochromatic light.
Fig. 9 means the figure of the state when CGH master of the embodiment 2 of present embodiment is made.
Figure 10 means the figure of other examples of the diverged position Fm1 of Y-direction.
Figure 11 means the figure of other examples of the diverged position Fm1 of Y-direction.
Figure 12 means the figure of other examples of the diverged position Fm1 of Y-direction.
Figure 13 means the figure of other examples of the diverged position Fm1 of Y-direction.
Figure 14 means the figure when CGH master of embodiment 1 is irradiated to the regeneration illumination light formed with white light.
Figure 15 means and can enough white observe the figure of the condition of CGH master.
Figure 16 means the light focused on as the focal position G to regulation with reference to light L, the figure using object light as the situation of the light of not expanding in Y-direction.
Figure 17 means the figure of prior art.
Figure 18 means the figure of prior art.
Description of reference numerals
1CGH master (CGH master recording medium)
2 regeneration illumination light
3 diffraction lights
Embodiment
Below, illustrate referring to the drawings the manufacture method of the hologram of present embodiment.
In the present embodiment, making computd synthetic hologram Fig. 1 at first.Fig. 1～Fig. 3, the basic method of expression making computd synthetic hologram Fig. 1.
At first, in the present embodiment, as computer-generated hologram, use the object light of only upwards expanding at the one-dimensional square of regulation and the hologram recorded from the pointolite of setting at original image.This method for making, be based on the method for the record of patent documentation 1.That is, as shown in Figure 1, suppose the object light Oi that the Pi of pointolite arbitrarily from original image O sends, as shown in Figure in the present embodiment only in the horizontal direction (in the parallel plane plane of XZ) upper expansion.So object light Oi only arrives wire on recording medium 1 zone B, on other zone of recording medium 1, object light Oi does not all arrive.When by optical means, making hologram, although the expansion that limits like this object light difficulty very, if in the situation that use the computer manufacture hologram, as long as just can easily control object light by the correction arithmetic expression.Therefore, the object light of sending for the whole pointolites from forming original image O, apply same restriction (object light only with the parallel plane plane of XZ in the restriction expanded).The computer hologram of making in the present embodiment, become the computer-generated hologram of the parallax that horizontal direction is only arranged.
Fig. 2 means the stereographic map of the concrete example of the recording method based on above-mentioned key concept.In this embodiment, cut apart in the horizontal direction original image O and recording medium 1 (record surface) by many parallel planes respectively, define the unit area of many wire.That is, as shown in the figure, by original image O be divided into the unit area A1, the A2 that add up to M, A3 ..., Am ... AM, by recording medium 1 similarly be divided into the unit area B1, the B2 that add up to M, B3 ..., Bm ... BM.In the situation that original image O is stereo-picture, constituent parts zone A1, A2, A3 ..., Am ... AM becomes the zone obtained by cutting apart this three-dimensional surface portion.Here, M unit area on original image O and M unit area on recording medium 1 are respectively man-to-man corresponding relations.For example, M unit area Am on original image O is corresponding with M unit area Bm on recording medium 1.
Have again, in the example meaned at this Fig. 2, constituent parts zone A1, A2, A3 ..., Am ... the width of AM, be set to the spacing of the Y-direction (being vertical direction in the present embodiment) of the pointolite defined on original image O and equate, each unit area becomes the zone of the wire that pointolite forms a line.For example, in illustrated example, in m unit area Am, N pointolite Pm1～PmN forms a line.
In addition, constituent parts zone B1, B2, B3 ..., Bm ... the width of BM, be set to the spacing of the Y-direction of the pointolite defined on original image O and equate, in each unit area, become the zone of the wire that computing point arranges two-dimensionally.Illustrated computing point Q (x, ym), expression is positioned at the computing point of the unit area Bm of m, in the XY coordinate system, is positioned on the position meaned with coordinate figure (x, ym).
In the situation that this is routine, about the interference wave intensity of computing point Q (x, ym), asked in the following manner.At first, will with this computing point Q (x, ym) under original image O corresponding to unit area Bm on unit area Am be decided to be the operand unit area.Then, the computing point Q (x of the object light Om1 sent as the pointolite Pm1～PmN to by this operand unit area Am～OmN and the interference wave that forms with reference to light L θ m, when the oscillator intensity of position ym) is asked for, this oscillator intensity is the interference wave intensity as the computing point Q (x, ym) of purpose.Here, with reference to light L θ m, be for example and the parallel plane monochromatic collimated beam line of YZ all with same angle, to incide on recording medium 1 in any position.Perhaps with reference to the incidence angle θ m of light L θ m, according to the imagination illumination of having supposed environment of observation and the setting of imaginary viewpoint, determine, for example, in the situation that while observing imagination from above pointolite, also can set in the following manner: the incident angle θ 1 for the normal direction from recording medium with reference to light L θ 1 of the unit area B1 of upper end becomes little angle δ, for the incident angle θ M with reference to light L θ M of the unit area Bm of lower end, becomes large angle beta.
Fig. 3 is the vertical view of the concept for such calculation process is described, means to see from the top of figure original image O that Fig. 2 means and the CGH master state with recording medium 1.As shown in the figure, in order to ask for computing point Q (x, ym) the necessary object light of interference wave intensity of locating, be restricted to be only from N pointolite Pm1 in operand unit area Am ..., Pmi ..., the object light Om1 that sends of PmN ..., Omi ..., OmN, do not need to consider the object light from the whole pointolites that form original image O.Like this, if for the whole computing point Q (x with definition on recording medium 1 at the CGH master, ym) ask for respectively the interference wave intensity of regulation, obtain using the intensity distributions of the interference wave of record on recording medium 1 at the CGH master, if the intensity distributions with the interference wave that physically record obtains someway, become CGH master 1.Particularly, as record in patent documentation 3, by with computing, putting on corresponding position the rectangle that records the occupation rate corresponding with interfering wave intensity, can make CGH master 1.
Above, narrated the information of the light source on a unit area Am of the m that will define on original image O with reference to Fig. 1～Fig. 3, be recorded in the method on the unit area Bm of m of definition on recording medium 1 for the CGH master.In the model of narration, unit area Am and Bm are elongated rectangular region in the method, and pointolite is arranged one-dimensionally, and computing point is arranged two-dimensionally.
Have again, in above method, for the amplitude of the object light at the computing point Q place on cut zone and the record of phase place, as described above with the method by being recorded with reference interference of light striped outside, also can as patent documentation 4,5 records like that with the depth registration phase place of the ditch of the three-dimensional element simultaneously thering is ditch, with the method for the width record amplitude of ditch.
Perhaps, also can record amplitude and phase place by the method for the Lee of record in the method, non-patent literature 2 of the A.W.Lohmann of record in non-patent literature 1 etc.
Fig. 4 means the figure of structure of the CGH master 1 of present embodiment.Fig. 4 (a) observes the figure of the system that Fig. 2 means from directions X, Fig. 4 (b) is the enlarged drawing of the CGH master 1 observed from directions X.
The CGH master 1 of present embodiment, unit area B1, the B2 meaned at Fig. 4 (a), B3 ..., Bm ... in BM, the different mode of intervals (spatial frequency) that makes respectively Y-direction of usining is made the interference fringe as diffraction pattern, thus the ken of change Y-direction.For example, the interference fringe interval Cm1 of the Y-direction of the unit area Bm of CGH master 1, Cm2, Cm3 ..., Cmt ... CmT, as shown in Fig. 4 (b), can be with various graphic makings.In Fig. 4 (b) as concept map illustrate Y-direction interference fringe interval Cm1, Cm2, Cm3 ..., Cmt ... CmT, but under many circumstances, the interference fringe pattern of physics forms as the concavo-convex of the surface of CGH master 1.In this case, as shown in Figure 5, irregular cross section is the whole bag of tricks such as rectangle (Fig. 5 (a)), curve (Fig. 5 (b)).In addition, yet can by the variation in cross section, by X-Y scheme, on Y-direction, not change periodically and determine the interference fringe interval.Have, in Fig. 5, interference fringe intervals different on Y-direction gradually change from a party in unit area again, but are not limited to this, can be with various graphic makings.
Fig. 6 means the figure of the state when CGH master 1 of the embodiment 1 of present embodiment is made.In the present embodiment 1, the diverged position of the Y-direction of the light source of object light Om is set as to CGH master 1 and diverged position Fm1 observer's opposition side.Therefore, as shown in Figure 7, object light Om is set to, and about directions X, from pointolite P1...Pm...PM, expands, does not send in Y-direction with not expanding, about Y-direction, from diverged position F11...Fm1...FM1, sends and expands.Although therefore a little astigmatism occurs, because the distance between original image O and CGH master 1 is extremely short, so almost not impact.
When setting in this wise light source, incident angle with regulation is irradiated with reference to light L, make object light Om and while being set with reference to the mode that light L interferes, in the unit area Bm of the CGH master 1 meaned at Fig. 6, occur interference fringe interval Cm1, Cm2, Cm3 ..., Cmt ... the interference fringe of CmT.In the present embodiment 1, the interference fringe interval occurs in the mode of expanding from the top down with respect to paper.That is, the spatial frequency that CGH master 1 is made as in interference fringe interval Cm1 side uprises, at the spatial frequency step-down of interference fringe interval CmT side.
Fig. 8 means that the CGH master 1 that the mode of the embodiment 1 to meaning with Fig. 6 and Fig. 7 is made irradiates the figure of the situation of the regeneration illumination light 2 consisted of monochromatic light.In the situation that the CGH master 1 meaned for Fig. 6 and Fig. 7 irradiates monochromatic regeneration illumination light 2, as shown in Figure 8, at the diffraction light 3 of CGH master 1 diffraction, expand from the side circular-arcly, while enlarge the ken on Y-direction, advance.
Fig. 9 means the figure of the state when CGH master 1 of the embodiment 2 of present embodiment is made.In the present embodiment 2, the focal position of the Y-direction of object light Om is set as to the focal position Fm2 with respect to observer's side of CGH master.Therefore, object light Om is set to: about the directions X perpendicular to paper, it is not sent from pointolite P1...Pm...PM in Y-direction with expanding, about Y-direction, it is sent from focal position F12...Fm2...FM2.Therefore, although a little astigmatism occurs, because the distance between original image O and CGH master 1 is extremely short, so almost not impact.
When setting in this wise light source, incident angle with regulation is irradiated with reference to light L, make object light Om and while being set with reference to the mode that light L interferes, in the unit area Bm of the CGH master 1 meaned at Fig. 9, occur interference fringe interval Cm1, Cm2, Cm3 ..., Cmt ... the interference fringe of CmT.In the present embodiment 2, the interference fringe interval occurs in the mode narrowed down from the top down for paper.That is, CGH master 1 is made as the spatial frequency step-down in interference fringe interval Cm1 side, in the spatial frequency of interference fringe interval CmT side, uprises.
Figure 10 is to Figure 13, means the figure about other examples of the diverged position Fm1 of the object light of Y-direction or focal position Fm2.Figure 10 means near the figure while being configured in CGH master 1 by diverged position Fm1.The now expansion of the ken of Y-direction increases.Figure 11 means figure when diverged position Fm1 is configured away from CGH master 1.The now expansion of the ken of Y-direction is dwindled.Figure 12 mean for all unit area B1, B2, B3 ..., Bm ... BM, the figure of the position relationship of CGH master 1 and diverged position Fm1 for fixedly the time.Now, easily, calculated load is little in design.Figure 13 mean for unit area B1, B2, B3 ..., Bm ... each of BM, the asynchronous figure of position relationship of CGH master 1 and diverged position Fm1.Now, can to unit area B1, B2, B3 ..., Bm ... the ken of each change Y-direction of BM.In the example meaned at Figure 13, can see from the unit area of top and bottom simultaneously and become large towards the scope of observer's reproduced light.
Figure 14 means figure when CGH master 1 that the mode of the embodiment 1 to meaning with Fig. 6 makes irradiates the regeneration illumination light 2 consisted of white light.When the CGH master 1 that Fig. 6 is meaned irradiates the regeneration illumination light 2 of white light, as shown in figure 14, send each and different diffraction lights 3 according to light wavelength from CGH master 1.In the present embodiment, the diffraction light 3 of each corresponding with RGB as shown in figure 14, is advanced on different directions, but can see white in whole regional S of the RGB that comprises diffraction light 3.
Here, detailed description can be observed with white the condition of CGH master 1.Figure 15 means and can observe with white the figure of the condition of CGH master.
In the Bm of the constituent parts zone of CGH master 1, incide in the regeneration illumination light 2 in place of high spatial frequency (fmax) of Y-direction, the direction of supposing the optical diffraction of the minimal wave length λ B (for example 380nm) that hope is used is that θ Bmax is (in the ZY plane, using the Z direction as 0 degree, to be rotated counterclockwise as positive angle), in addition, incide in the regeneration illumination light 2 in place of lowest spatial frequency (fmin) of Y-direction, for example, when the direction of the optical diffraction of the long wavelengths R (780nm) that supposes wish to use is θ Rmin, if meet the relation of following conditional (1), exist and can observe with white the position of the constituent parts zone Bm of CGH master 1.
θRmin＜θBmax …(1)
Here, the angle θ of angle of diffraction etc., suppose be in the ZY plane using the Z direction as 0 degree, the positive angle be rotated counterclockwise, its span is-pi/2<θ<pi/2.
In addition, when the formula that uses diffraction
1/f＝λ/(sinθout-sinθin)
The spatial frequency of the Y-direction of f:CGH
λ: wavelength
θ in: the incident angle of incident light
θ out: the shooting angle of diffraction light
The time, because, using the incident angle of incident light as θ L, become
θRmin＝sin
-1(fmin·λR+sinθL)
θBmax＝sin
-1(fmax·λB+sinθL)
So in order there to be the position that can observe the constituent parts zone Bm of CGH master 1 with white, by θ Rmin and θ Bmax substitution conditional (1), make to meet following conditional (2), and then, in order to observe the constituent parts zone Bm of CGH master 1 with white in observation place, as long as at the arrow that will give θ Bmax with give intersection point that the arrow of θ Rmin extends as W, will, meet following conditional (3) and get final product during as θ towards the angle of eye E from intersection point W.
fmin·λR＜fmax·λB …(2)
θRmin＜θE＜θBmax …(3)
Therefore, as long as make each of all unit areas of CGH master 1, the formula that satisfies condition (2) and conditional (3), can observe CGH with white in observation place all.
Figure 16 means each focusing of the focal position G to regulation, the figure of object light when Y-direction is not expanded to unit area with reference to light L.As shown in figure 16, reference light L to per unit zone Bm to the focal position G of the regulation of Y-direction focus on, object light Om is while setting as the line source of not expanding in Y-direction, the interference fringe in the unit area Bm of CGH master 1 with the interference fringe interval Cm1 of Y-direction, Cm2, Cm3 ..., Cmt ... the mode that CmT expands from the top down with respect to paper shows.That is the spatial frequency that, CGH master 1 is made as interference fringe interval Cm1 side uprises, the spatial frequency step-down of interference fringe interval CmT side.In addition, the focal position G of Y-direction, also can be at the observer's of hologram opposition side, and in this case, the interval that is made as Y-direction uprises in the spatial frequency of Cm1 side, at the spatial frequency step-down of CmT side.
Like this, interference fringe interval Cm1 by the Y-direction with in unit area, Cm2, Cm3 ..., Cmt ... the mode that CmT is different is made CGH master 1, thereby the diffusion angle of the Y-direction of change diffraction light 3, therefore can make the CGH master 1 of the ken that has enlarged Y-direction.And then, when as regeneration illumination light 2, using white light, when can enlarge in the ken of Y-direction, with white, observe.
Abovely according to embodiment, the method for making of computer-generated hologram of the present invention and the computer-generated hologram of making by the method have been described, but have the invention is not restricted to these embodiments and various distortion can be arranged.For example, computer-generated hologram of the present invention, also can apply the technology as the computing machine synthetic hologram stereographic map of prompting in patent documentation 6 and patent documentation 7.
Claims (9)
1. the method for making of a computer-generated hologram records amplitude information and phase information by computed computing on the record surface of regulation, it is characterized in that,
Described computer-generated hologram,
Have: first direction and with the second direction of described first direction quadrature,
Have: the parallax on described first direction only,
Have: there is the constituent parts zone of Rack on described second direction,
In described constituent parts zone, be produced on frequency different diffraction pattern in space on described second direction.
2. the method for making of computer-generated hologram according to claim 1, is characterized in that, the different spatial frequency on second direction of described diffraction pattern gradually changes from a party in described unit area.
3. the method for making of computer-generated hologram according to claim 1, it is characterized in that, use the object light from being set in the pointolite recorded object, at described first direction, expanding, expand in described second direction from the position different from described pointolite to carry out record.
4. the method for making of computer-generated hologram according to claim 2, it is characterized in that, use the object light from being set in the pointolite recorded object, at described first direction, expanding, expand in described second direction from the position different from described pointolite to carry out record.
5. the method for making of computer-generated hologram according to claim 1, it is characterized in that, the object light of fixed width is expanded, is had in described second direction in use from being set in the line source recorded object at described first direction, and use and to carry out record with reference to light, describedly focused on reference to light position to the regulation of each decision of described unit area on described second direction.
6. the method for making of computer-generated hologram according to claim 2, it is characterized in that, the object light of fixed width is expanded, is had in described second direction in use from being set in the line source recorded object at described first direction, and use and to carry out record with reference to light, describedly focused on reference to light position to the regulation of each decision of described unit area on described second direction.
7. the method for making to any one described computer-generated hologram of claim 6 according to claim 1, is characterized in that, described diffraction pattern consists of interference fringe.
8. the method for making to any one described computer-generated hologram of claim 6 according to claim 1, is characterized in that, described diffraction pattern consists of the figure of phase modulation and amplitude.
9. the recording medium of a computer-generated hologram, the record surface with described regulation of the computer-generated hologram that record makes to the method for making of any one described computer-generated hologram in claim 8 by claim 1.
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| JP2008011279 | 2008-01-22 | ||
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| JP2008287309 | 2008-11-10 | ||
| JP2008-287309 | 2008-11-10 | ||
| JP2008287309A JP5170436B2 (en) | 2008-01-22 | 2008-11-10 | Method for producing computer-generated hologram and computer-generated hologram produced by the method |
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| FR2986874A1 (en) * | 2012-02-15 | 2013-08-16 | France Telecom | HOLOGRAPHIC PATTERN ENCODING METHOD, CORRESPONDING ENCODING DEVICE AND COMPUTER PROGRAM |
| CN105223796B (en) * | 2015-09-08 | 2018-09-11 | 北京邮电大学 | Hologram computational methods based on near-eye display device and device |
| CN107526279B (en) * | 2017-08-16 | 2019-06-28 | 四川大学 | A method of expanding holographic reconstructed image and watches vision area |
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| JP4545297B2 (en) * | 2000-09-01 | 2010-09-15 | 大日本印刷株式会社 | Optical element and manufacturing method thereof |
| JP4905672B2 (en) * | 2005-12-13 | 2012-03-28 | 大日本印刷株式会社 | Screen switching hologram manufacturing method and screen switching hologram manufactured by the method |
| JP4844250B2 (en) * | 2006-06-14 | 2011-12-28 | 大日本印刷株式会社 | Method and apparatus for manufacturing hologram recording medium |
| JP4844249B2 (en) * | 2006-06-14 | 2011-12-28 | 大日本印刷株式会社 | Method and apparatus for manufacturing hologram recording medium |
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| US4568141A (en) * | 1982-10-04 | 1986-02-04 | Lgz Landis & Gyr Zug Ag | Document having an optical-diffraction authenticating element |
| US20030151786A1 (en) * | 2000-07-03 | 2003-08-14 | John Drinkwater | Optical security device |
| US20030151821A1 (en) * | 2001-12-19 | 2003-08-14 | Favalora Gregg E. | Radiation conditioning system |
| CN1795420A (en) * | 2003-04-04 | 2006-06-28 | 大日本印刷株式会社 | Computer-generated hologram |
| CN1548991A (en) * | 2003-05-06 | 2004-11-24 | ʷ�ٷ����³ | Optically variable form birefringent structure and method and system and method for reading same |
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| JP2012212183A (en) | 2012-11-01 |
| JP5257640B2 (en) | 2013-08-07 |
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