JP4338124B2 - Volume hologram recording body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a volume hologram recording body, and more particularly to a volume hologram recording body excellent in design and security.
[0002]
[Prior art]
A hologram recording body that records a three-dimensional image and a pupil image composed of a minute repetitive pattern that cannot be normally seen on a volume hologram, and determines whether the hologram is real or counterfeit according to the reproduction pattern of the pupil image. This is proposed in Patent Document 1.
[0003]
In addition, the volume hologram recording medium is deactivated in a fine repeating pattern using ultraviolet rays, and an object image is recorded in the remaining photosensitive area, and whether the hologram is true or forged by the deactivation pattern. A hologram recording body for determination is proposed in Patent Document 2.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-24538
[0005]
[Patent Document 2]
JP-A-11-277958
[0006]
[Problems to be solved by the invention]
The hologram recording bodies proposed in Patent Document 1 and Patent Document 2 described above are all excellent in security, but in any case, the fine pattern used for forgery determination is not visible, so that the design is not necessarily excellent in design. I can't say that.
[0007]
The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a multiplex-recorded volume hologram recording body excellent not only in security for counterfeiting but also in design. That is.
[0008]
[Means for Solving the Problems]
The volume hologram recording body of the present invention that achieves the above object is based on the interference between the image of the three-dimensional object and the image of the planar pattern with the same reference light having the same incident angle and the same wavelength and the object light having different incident angles. It is characterized in that it is recorded twice as a reflection hologram.
[0009]
In this case, the hologram of the image of the plane pattern is selectively recorded only in the area corresponding to the plane pattern, and is recorded as a hologram composed of parallel interference fringes in at least one section that forms an angle with the recording surface. It is desirable that
[0010]
In addition, the cross section includes the normal of the recording surface, and the hologram of the image of the planar pattern has an incident angle of the object light and an incident angle of the reference light on the same side with respect to the normal of the recording surface. Recorded with the same incident angle from the opposite side across the recording surface, and the hologram of the image of the three-dimensional subject is the angular relationship where the central ray of the object light is incident substantially perpendicular to the recording surface Can be recorded in.
[0011]
Further, it is desirable that the hologram of the image of the plane pattern is recorded by interference between the object light that diffuses only in the direction orthogonal to the cross section and the reference light.
[0012]
Moreover, the image of a plane pattern may be recorded as an image of a chromatic pattern or a micro character.
[0013]
In addition, an image of a plane pattern may be recorded as a line or halftone dot image.
[0014]
Further, at least one of the image of the three-dimensional object and the image of the planar pattern may be multiplexed and recorded with two or more different wavelengths.
[0015]
A photopolymer can be used as the hologram sensitive material.
[0016]
In another volume hologram recording material of the present invention, images of a plurality of plane patterns are multiplexed and recorded as a reflection hologram by interference between the same reference light having the same incident angle and the same wavelength and the object light having different incident angles. It is characterized by.
[0017]
In this case, the image of the three-dimensional object is an object at the time of recording the reference light having the same incident angle and the same wavelength as the reference light at the time of recording a plurality of plane pattern images, and the image at the plurality of plane patterns. Multiple recording may be performed by interference between light and object light having an incident angle different from that of light.
[0018]
In addition, each hologram of a plurality of planar pattern images is selectively recorded only in an area corresponding to the planar pattern, and is a hologram composed of interference fringes parallel in at least one section that forms an angle with respect to the recording surface. It is desirable to be recorded.
[0019]
In addition, a plurality of plane pattern images may be formed of the same plane pattern image.
[0020]
Further, it is desirable that each hologram of a plurality of planar pattern images is recorded by interference between the object beam and the reference beam that diffuses only in the direction orthogonal to the cross section.
[0021]
Further, a plurality of plane pattern images may be multiplexed and recorded at two or more different wavelengths.
[0022]
In the present invention, the image of the three-dimensional object and the image of the plane pattern are double-recorded as a reflection hologram by interference between the same reference light having the same incident angle and the same wavelength and the object light having different incident angles. In the method for determining the authenticity of the volume hologram recording body,
A line film or halftone dot image is recorded as an image of the plane pattern, and a pattern film on which a line or dot of the same pitch as the plane pattern of the line or halftone dot is drawn is used as the volume hologram recording body. And determining the authenticity of the volume hologram recording body by using moire fringes generated between the image of the plane pattern and the plane pattern of the lines or halftone dots of the pattern film. Is included.
[0023]
For this purpose, it is desirable that the plane pattern image is recorded so as to be reproduced in the vicinity of the hologram surface of the volume hologram recording body.
[0024]
In the volume hologram recording body of the present invention, the image of the three-dimensional object and the image of the planar pattern are formed as a reflection hologram by interference with the same reference light having the same incident angle and the same wavelength and the object light having different incident angles. Since it is recorded twice, the stereoscopic image of the three-dimensional object is reproduced in one color with an angular relationship close to the recording condition, and the image of the planar pattern varies with various white illumination light incident angles and according to the incident angles. It is reproduced in color, is excellent in design, and has high security by determining whether or not it has such characteristics.
[0025]
In another volume hologram recording material of the present invention, a plurality of planar pattern images are formed as a reflection hologram by interference between the same reference light having the same incident angle and the same reference light having the same wavelength and object light having different incident angles. Since multiple recording is performed, images of a plurality of plane patterns are reproduced as images of different colors continuously at different observation positions relatively continuously with respect to the volume hologram recording body, and are excellent in design. In addition, it is possible to obtain high security by determining whether or not such characteristics are provided.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
The volume hologram recording body of the present invention will be described while explaining examples of the recording method and the reproduction characteristics of the volume hologram recording body recorded by the method.
[0027]
FIG. 1 is a diagram for explaining a process for preparing a first hologram master 11 ′ (FIG. 3) used for recording the volume hologram recording body of the present invention. A three-dimensional object O for recording a three-dimensional image is prepared. As shown in FIG. 1A, for example, the three-dimensional object O is arranged on the front side of a volume hologram photosensitive material 1 made of a photopolymer, and the object O is allowed to have a predetermined wavelength λ. Illumination is performed using interference illumination light, and scattered light (object light) 2 from the subject O is incident on the hologram photosensitive material 1 substantially perpendicularly. On the other hand, the coherent reference light 3 having the same wavelength λ from the same light source as the illumination light is incident obliquely from the same side as the object light 2, and the object light 2 and the reference light 3 are caused to interfere in the hologram sensitive material 1. The transmission hologram 1 ′ of FIG. 1 (b) is recorded.
[0028]
Next, as shown in FIG. 1B, reproduction illumination light 3 ′ having the same wavelength λ traveling opposite to the reference light 3 is incident on the transmission hologram 1 ′ from the opposite side to the incident side of the reference light 3 at the time of recording. Then, the diffracted light 2 ′ for reproducing the three-dimensional reproduction image O ′ is diffracted at the position of the subject O at the time of recording the transmission hologram 1 ′. Therefore, another volume hologram sensitive material 11 made of, for example, a photopolymer is disposed in the vicinity of the position of the three-dimensional reproduced image O ′ so that the diffracted light 2 ′ from the transmission hologram 1 ′ is incident and from the opposite side of the hologram sensitive material 11. Coherent reference light 4 consisting of substantially parallel light of the same wavelength λ from the same light source as the reproduction illumination light 3 ′ is incident at an incident angle θ, and diffracted light (object light) 2 ′ and reference light 4 are caused to interfere with each other. The first hologram master 11 'shown in FIG. 3 is recorded.
[0029]
FIG. 2 is a diagram for explaining a process for preparing the second hologram master 21 ″ (FIG. 3) used for recording the volume hologram recording body of the present invention. A mask plate 22 for recording a plane pattern is prepared, and the pattern shape of the shielding portion of the mask plate 22 corresponds to the plane pattern to be finally reproduced. ), For example, a mask plate that is placed in close contact with or slightly spaced from the volume hologram sensitive material 21 made of a photopolymer, and is irradiated with light 23 such as ultraviolet rays that deactivates the hologram sensitive material 21 from the mask plate 22 side. The portion corresponding to the 22 openings is deactivated (photosensitivity is lost).
[0030]
Next, as shown in FIG. 2B, a one-dimensional diffusion plate 24 having a diffusion action only in the one-dimensional direction is brought into close contact with the front surface of the partially deactivated hologram sensitive material 21 ′. Here, as the one-dimensional diffusion plate 24 having a diffusion action only in the one-dimensional direction, there are a lenticular lens plate, a diffusion plate provided with a rubbing groove only in one direction, and the one-dimensional diffusion direction is illustrated. Select in the direction perpendicular to the surface of With the hologram sensitive material 21 ′ and the one-dimensional diffuser 24 in close contact, the same incident angle as the incident angle of the reference light 4 at the time of recording the first hologram original plate 11 ′ of FIG. The coherent reference light 26 of substantially parallel light having the same wavelength λ as that of the reference light 4 is incident at θ, and the coherent illumination light 25 from the same light source as the reference light 26 from the one-dimensional diffusion plate 24 side is within the plane of the drawing. At an incident angle θ ′. Illumination light 25 incident on the one-dimensional diffuser plate 24 at this incident angle θ ′ passes through the one-dimensional diffuser plate 24 and is projected in the plane of the figure at the same angle θ ′ and perpendicular to the plane of the figure. Is converted into diffusing light, enters the hologram sensitive material 21 ′, and interferes with the reference light 26 incident at an incident angle θ from the opposite side, whereby the second hologram master 21 ″ of FIG. 3 is recorded.
[0031]
In the recorded second hologram original plate 21 ″, in the cross section of the plane including the reference light 26 and the illumination light 25 (the surface of FIG. 2B), the inside of the medium of the hologram sensitive material 21 ′ within the cross section. Uniform interference fringes parallel to each other are recorded at an inclination angle (slant angle) parallel to the direction vector of the reference light 26 and the direction vector of the illumination light 25. Here, the illumination is recorded. Although the light 25 is incident on the plane of Fig. 2B, the light 25 may be incident on the front side or the back side of the plane at an angle to the plane of the diagram. In the cross section of the plane including the reference light 26 and the illumination light 25 (in this case, not the plane of FIG. 2B), the direction of the reference light 26 in the medium of the hologram sensitive material 21 ′ within the cross section. A vector pointing in the middle of the vector and the direction vector of the illumination light 25 Parallel inclination interference fringes mutually parallel uniform (slant angle) has become what is recorded.
[0032]
Now, as shown in FIG. 3, the first hologram master 11 ′ created in the process of FIG. 1 and the second hologram master 21 ″ created in the process of FIG. The volume hologram sensitive material 29 made of a photopolymer is brought into close contact with the hologram sensitive material 29, and proceeds from the side of the hologram sensitive material 29 to the side opposite to the reference light 4 at the time of recording the first hologram master 11 ′ and the reference light 26 at the time of recording the second hologram master 21 ″. When the illumination light 27 having the same wavelength λ is incident, the illumination light 27 that has passed through the hologram sensitive material 29 enters the first hologram original plate 11 ′ to reproduce the image O ″ of the three-dimensional reproduction image O ′. Is diffracted. The diffracted light 2 ″ is incident on the back surface of the hologram sensitive material 29 substantially perpendicularly and interferes with the illumination light 27 first incident on the hologram sensitive material 29, thereby interfering with the reflection hologram that reproduces the three-dimensional reproduced image O ″. The fringes are duplicated and recorded in the hologram sensitive material 29. Further, the same illumination light 27 that has passed through the hologram sensitive material 29 is incident on the second hologram original plate 21 ″, and from the portion other than the portion deactivated by the light 23 (the portion corresponding to the shielding portion of the mask plate 22), Diffracted light 25 ′ traveling opposite to the illumination light 25 that has passed through the one-dimensional diffusion plate 24 at the time of recording the two hologram master 21 ″, that is, a diffraction angle θ ′ when projected in the plane of the figure, and perpendicular to the plane of the figure The diffracted light 25 ′ that diffuses into the light is diffracted. This diffracted light 25 ′ is also incident on the back surface of the hologram sensitive material 29 and interferes with the illumination light 27 first incident on the hologram sensitive material 29 to reproduce the image of the planar pattern of the shielding portion of the mask plate 22. The interference fringes are superimposed and recorded in the hologram sensitive material 29. The interference fringes of the reflection hologram for reproducing the image of the planar pattern of the shielding part of the mask plate 22 are the same as the interference fringes of the hologram in the second hologram original 21 ″, and one cross section (when recording the original 21 ″) In the cross section corresponding to the plane including the reference light 26 and the illumination light 25, the interference fringes are uniform and parallel.
[0033]
In FIG. 3, the second hologram original 21 ″ is superimposed on the hologram sensitive material 29, but the overlapping order of the first hologram original 11 ′ and the second hologram original 21 ″ may be reversed.
[0034]
Now, the reproduction characteristics of the volume hologram recording body 29 ′ of the embodiment of the present invention produced as described above will be described. Here, for easy understanding, the angle θ in FIGS. 1 to 3 is 45 ° (plus), the angle θ ′ is 35 ° (minus) (case (a)), the angle θ is 45 ° (plus), the angle θ ′ is 45 ° (minus) (case (b)), angle θ is 45 ° (plus), angle θ ′ is 55 ° (minus) (case (c)), and the refractive index of the volume hologram recording body 29 ′. Is 1.52, the refractive index modulation is 0.05, the film thickness is 15 μm, and the wavelength λ during recording is 532 nm.
[0035]
As shown in FIG. 4A, when the white illumination light 30 for reproducing the volume hologram recording body 29 ′ is incident on the volume hologram recording body 29 ′ at an incident angle of 45 ° (plus), three-dimensional reproduction is performed. The diffracted light 31 that reproduces the image O ″ is diffracted in the front direction of the volume hologram recording body 29 ′, and the observer eyeball E positioned in that direction receives the image of the stereoscopic reproduction image O ″, that is, the three-dimensional object O. I can see the statue. At this time, the center wavelength of the diffracted light 31 is approximately 532 nm, and a green three-dimensional image can be seen. The diffraction efficiency wavelength dependency and diffraction angle characteristic of the diffracted light 31 in this state are as shown in FIG.
[0036]
Further, in the angular relationship of the white illumination light 30 with respect to the volume hologram recording body 29 ′ in FIG. 4 (a), the diffracted light that reproduces the image of the planar pattern of the shielding portion of the mask plate 22 is rotated in the case (a). As diffracted light 32a in the direction of folding angle 35 ° (minus), in the case of case (b), as diffracted light 32b in direction of diffraction angle 45 ° (minus), in the case of case (c), in direction of diffraction angle 55 ° (minus). The diffracted light 32c is diffracted. When viewed from these directions in each case, the planar pattern image appears green at a central wavelength of about 532 nm. The diffraction efficiency wavelength dependence and diffraction angle characteristics of the diffracted beams 32a, 32b, and 32c in this state are as shown in FIGS. 6B, 6C, and 6D, respectively.
[0037]
Thus, when the white illumination light 30 is incident on the volume hologram recording body 29 ′ at an incident angle of + 45 °, an image of the green three-dimensional object O having the same recording wavelength as the front wavelength is also −35 ° (case (A)), a -45 ° (case (b)), and -55 ° (case (c)) image of the same green planar pattern as the recording wavelength can be seen in the same direction. Since 'is hardly observed at an angle such as -35 ° to -55 °, only a three-dimensional image of the three-dimensional subject O reproduced in the front direction is observed.
[0038]
Next, in a state where the position of the light source of the white illumination light 30 and the position of the observer eyeball E are fixed, as shown in FIG. 4B, the angle of the volume hologram recording body 29 ′ is tilted to thereby increase the volume hologram recording body 29. When the normal line of 'is at an angle of 22.5 ° with respect to the white illumination light 30, the diffracted light beams 32'a, 32'b, and 32'c that reproduce the image of the planar pattern of the shielding part of the mask plate 22 are respectively obtained. Are diffracted to angles of −13.8 ° (case (a)), −22.5 ° (case (b)), and −30.5 ° (case (c)), respectively. Since the position of the light source of the white illumination light 30 and the observer's eyeball E is fixed and has an angular relationship of 45 ° with respect to the volume hologram recording body 29 ′ (FIG. 4A), the case (b ), The observer's eyeball E is positioned in the direction of the diffracted light 32'b, and the diffracted light 32'b is incident on the observer's eyeball E so that an image of the plane pattern can be seen. In the case (a), when the observer eyeball E is positioned close to the white illumination light 30, in the case (c), the observer eyeball E is positioned far from the white illumination light 30, respectively. Since the observer's eyeball E is positioned in the direction of the diffracted beams 32′a and 32′c, an image of the planar pattern of the shielding part of the mask plate 22 can be seen. However, in these angular relationships, the white illumination light 30 is at an angle different from the incident angle of the illumination light (reference light) 27 at the time of recording with respect to the volume hologram recording body 29 ′. The center wavelengths of a, 32'b, and 32'c are shifted from 532 nm at the time of recording, and images of 575 nm (yellowish green), 580 nm (yellowish green close to yellow), and 590 nm (yellow) are obtained, respectively. At this time, the diffracted light 31 ′ for reproducing the image of the three-dimensional subject O is diffracted in a direction of approximately + 20 °, but the diffraction efficiency is low in this direction, so that it is difficult to observe clearly. The diffraction efficiency wavelength dependence and diffraction angle characteristics of the diffracted beams 31 ′, 32′a, 32′b, and 32′c in this state are shown in FIGS. 7 (a), (b), (c), and (d). .
[0039]
Further, when the white illumination light 30 is incident on the volume hologram recording body 29 ′ from the front direction, as shown in FIG. 5A, the diffracted light 32 ″ a that reproduces the image of the planar pattern of the shielding portion of the mask plate 22 is obtained. 32 ″ b and 32 ″ c are diffracted to angles of + 8.4 ° (case (a)), 0 ° (front direction) (case (b)), and −7.5 ° (case (c)), respectively. Then, an image of the planar pattern can be seen on the observer's eyeball E located in the direction corresponding to each case.The center wavelengths of the diffracted light 32 ″ a, 32 ″ b, 32 ″ c in these cases are around 585 nm ( Yellow), around 600 nm (orange near yellow), and 615 nm (orange). At this time, the diffracted light 31 ″ for reproducing the image of the three-dimensional subject O is diffracted in the direction of approximately + 45 ° around the center wavelength of 530 nm. However, since the diffraction efficiency is low in this direction, it is difficult to observe clearly. The diffraction efficiency wavelength dependence and diffraction angle characteristics of the diffracted light beams 31 ″, 32 ″ a, 32 ″ b, and 32 ″ c in this state are shown in FIGS. 8 (a), (b), (c), and (d). Show.
[0040]
As exemplified by the angular relationship as described above, the image of the three-dimensional object O is the positional relationship between the white illumination light 30 and the observer eyeball E, which is similar to the angular relationship between the reference light 27 and the object light 2 ″ at the time of recording. At the time of recording, the same color as that at the time of recording is visible, but the other angular relations and colors are not so clearly visible, whereas the image of the planar pattern of the shielding part of the mask plate 22 is the reference light at the time of recording. The white illumination light 30 and the observer's eyeball E other than the angular relationship 27 and the object light 25 'can be clearly seen in the positional relationship, but the color looks different depending on the observation direction, and the color is switched to change the image of the plane pattern. Can be seen.
[0041]
As shown in FIGS. 6 to 8, the peak value of the diffraction efficiency of the hologram recording the image of the planar pattern of the shielding part of the mask plate 22 shows a value of about 100% even if the peak value deviates from the hologram recording condition. This is because the hologram interference fringes are uniform and parallel interference fringes within one cross section (FIGS. 7B to 7D and 8B to 8D). Moreover, the peak value of the diffraction efficiency of the hologram recording the image of the three-dimensional object O decreases when the hologram recording condition is not satisfied because there are many hologram interference fringes that form an angle with respect to the photosensitive surface. It is believed that there is. 6 to 8 are obtained by Kogelnik coupled-wave theory, and the diffraction angle characteristic is obtained by a diffraction equation.
[0042]
By the way, when recording a planar pattern hologram of the shielding part of the mask plate 22, since the one-dimensional diffusion plate 24 is interposed, the hologram recording the planar pattern image of the shielding part of the mask plate 22 is a simple hologram mirror. Unlike diffracted light 32'a, 32'b, 32'c, 32 "a, 32" b, 32 "c, the direction perpendicular to the paper surface of FIGS. 4 (b) and 5 (a) It is diffused (when the second hologram original plate 21 ″ is recorded with the arrangement shown in FIG. 2B). This is shown in FIG. Therefore, a viewing zone having an angle α is secured in the lateral direction. In addition, as shown in FIG. 5C, there is a component that is incident in the direction of the observer's eyeball E even when the white illumination light 30 is incident in the lateral direction within the range of the angle α. Only the image of the flat pattern can be reproduced and observed.
[0043]
As described above, the volume hologram recording body 29 ′ according to the present invention has a three-dimensional image of the three-dimensional object O and a plane pattern image of the mask plate 22 incident on the same reference light having the same incident angle and the same wavelength. Although it is recorded in a reflection type due to the interference with the object light at the corner, the three-dimensional image of the three-dimensional subject O is reproduced in one color with an angular relationship close to the recording condition, and the plane pattern images of the mask plate 22 are various. The white illumination light 30 has an incident angle and is reproduced with a different color depending on the incident angle. It has excellent design and has high security by determining whether it has such characteristics. Become.
[0044]
By the way, in the arrangement of FIG. 3, the first hologram original plate 11 ′ created in the process of FIG. 1 and the illumination light 25 in the process of FIG. The volume hologram recording body 29 ′ is superposed on one second hologram master 21 ″ taken in the case (a)), −45 ° (case (b)), and −55 ° (case (c)). The volume hologram recording body 29 'is duplicate-recorded, and the diffracted light 32a, 32b, 32c and the diffracted light 32'a, 32 in the state of FIGS. 4 (a), 4 (b), and 5 (a). 'b, 32'c, any one of diffracted lights 32 "a, 32" b, 32 "c, that is, diffracted lights 32a and 32'a and 32" a, or diffracted lights 32b and 32 'b and 32 "b, or only diffracted light 32c and 32'c and 32" c are diffracted and reproduced. Ri, not has from that diffracts these diffracted light simultaneously. May be obtained in the following to create a volume hologram recording body 29 'that diffracts these diffracted light simultaneously.
[0045]
That is, in the arrangement of FIG. 2B, three hologram sensitive materials 21 ′ that are similarly deactivated using the same mask plate 22 are prepared, and each hologram sensitive material 21 ′ is different at the same wavelength λ. The incident angle θ ′ of the illumination light 25 (in order to be the same as the above example, for example, −35 °, −45 °, −55 °) and the incident angle θ of the same reference light 26 (the same as the above example) For example, three hologram masters 21 ″ a, 21 ″ b, 21 ″ are recorded at different illumination light incident angles θ ′, for example, at 45 °). 9, the first hologram master 11 ′ created in the process of FIG. 1 and these three hologram masters 21 ″ a, 21 ″ b, 21 ″ c are overlapped as shown in FIG. In addition, it is brought into close contact with a volume hologram sensitive material 29 made of another photopolymer, Illumination light of the same wavelength λ traveling from the side of the program light sensitive material 29 to the side opposite to the reference beam 4 at the time of recording the first hologram master 11 ′ and the reference beam 26 at the time of recording the hologram masters 21 ″ a, 21 ″ b, 21 ″ c. 27 is made incident, and the diffracted light 2 ″ for reproducing the image O ″ of the three-dimensional reproduction image O ′ diffracted from the first hologram master 11 ′ is caused to interfere with the illumination light 27 incident first, so that the three-dimensional reproduction image O The interference fringes of the reflection hologram that reproduces the image "" are duplicated and recorded in the hologram sensitive material 29, and are incident on the hologram masters 21 "a, 21" b, 21 "c and other than the inactive portions caused by the respective lights 23 Diffracted from the portion (corresponding to the shielding portion of the mask plate 22) and opposite to the illumination light 25 that has passed through the one-dimensional diffusion plate 24 during recording of each hologram master 21 "a, 21" b, 21 "c Advancing diffracted light 25'a, 25'b, 2 'And c, by interfering with the illumination light 27 which is incident first, to multiply replication recorded respectively in the hologram photosensitive material 29 interference fringes reflection hologram for reproducing an image of a plane pattern of the shielding portion of the same mask plate 22. The interference fringes of the three reflection holograms for reproducing the plane pattern image of the shielding part of the mask plate 22 are the same as the interference fringes of the holograms in the hologram masters 21 ″ a, 21 ″ b, 21 ″ c. The interference fringes are uniform and parallel within one cross section (the cross section corresponding to the plane including the reference light 26 and the illumination light 25 during recording of the original plates 21 "a, 21" b, and 21 "c). .
[0046]
The volume hologram recording body 29 ′ duplicated and recorded in this way has the diffracted light 32a, 32b, 32c, diffracted light 32′a, 32'b, 32'c and diffracted light 32 "a, 32" b, 32 "c are all diffracted at the same time, and as shown in FIG. 4 (b), with respect to the normal line of the volume hologram recording body 29 ' For example, when the white illumination light 30 is incident at an angle of 22.5 °, when the observer's eyeball E is moved as indicated by the solid line double arrow in the figure, the observer's eyeball E has diffracted light 32′a, 32. 'b and 32'c are entered in order, and the images of the planar pattern of the shielding part of the same mask plate 22 while changing colors near 575 nm (yellowish green), 580 nm (yellowish green close to yellow), and 590 nm (yellow), respectively. In addition, as shown in FIG. When the white illumination light 30 is incident from the front direction of the volume hologram recording body 29 ′, when the observer eyeball E is moved as shown by the solid line double arrow in the figure, the observer eyeball E receives the diffracted light 32 ″ a. 32 ″ b and 32 ″ c are entered in order, and the planar pattern of the shielding portion of the same mask plate 22 while changing the color near 585 nm (yellow), 600 nm (orange orange), and 615 nm (orange), respectively. You will see the image of 4 (b) and 5 (a), the white illumination light 30 is reversed even if the observer's eyeball E is fixed and the volume hologram recording body 29 'is moved as indicated by the broken arrows in the drawing. If there is a certain width in the incident direction, similarly, the image of the planar pattern of the shielding part of the same mask plate 22 can be seen with the color changing in order.
[0047]
Thus, in another volume hologram recording body 29 ′ according to the present invention, images of a plurality of planar patterns on the same mask plate 22 are objects having different incident angles from the same reference light having the same incident angle and the same wavelength. Reflected multiple recording is performed by interference with light, and images of a plurality of planar patterns on the mask plate 22 are continuously different in color at different observation positions relatively continuously with respect to the volume hologram recording body 29 ′. The image is reproduced as an image, which is also excellent in design, and has high security by determining whether or not it has such characteristics. Furthermore, a three-dimensional image of the three-dimensional object O can be recorded on the volume hologram recording body 29 ′ by interference between the same reference light having the same incident angle and the same wavelength and the object light having a different incident angle. It can be made higher.
[0048]
In addition, in the case of the volume hologram recording body 29 ′ duplicated and recorded in the arrangement of FIG. 3 and the volume hologram recording body 29 ′ duplicated and recorded in the arrangement of FIG. The pattern image may be color-coded by triple recording with R (red), G (green), and B (blue). In that case, for example, when an image of the planar pattern of the shielding part of the mask plate 22 is observed in the state of FIGS. 4B and 5A, the mask whose color slightly changes for each position of the image of the planar pattern. It appears as an image of a planar pattern of the plate 22 and the design is further enhanced.
[0049]
By the way, the one-dimensional diffusion plate 24 is not necessarily used in the process of creating the second hologram original plate 21 ″, 21 ″ a, 21 ″ b, and 21 ″ c of FIG. However, if the one-dimensional diffuser plate 24 is not used, a wide viewing area cannot be secured in the lateral direction as shown in FIGS. 5B and 5C, and the white illumination light 30 is tilted in the lateral direction. Cannot enter.
[0050]
In addition, as a method for recording the first hologram original plate 11 ′ in FIG. 1, a reflection type hologram photographing method using a one-step or two-step denniske arrangement may be used.
[0051]
Further, as a method of recording the second hologram master 21 ″, 21 ″ a, 21 ″ b, 21 ″ c in FIG. 2, a reflective one-dimensional diffuser is used instead of the transmissive one-dimensional diffuser 24. Thus, a reflection hologram imaging method using a denniske arrangement may be used.
[0052]
Further, in order to further improve security, as a planar pattern for recording the second hologram original plate 21 ″, 21 ″ a, 21 ″ b, 21 ″ c, a chromatic pattern or micro character used in securities or the like May be recorded as a planar pattern.
[0053]
Furthermore, as a plane pattern for recording the second hologram original plate 21 ″, 21 ″ a, 21 ″ b, 21 ″ c, a line or a halftone dot may be recorded as a plane pattern.
[0054]
In this case, similarly to Patent Document 2, a pattern film on which lines or halftone dots having the same pitch as the plane lines or halftone dots of the plane pattern is used, and the pattern film is used as a volume hologram recording body 29 ′. And observe the moire fringes generated between the lines or halftone dots of the plane pattern and the lines or halftone dots of the pattern film, and use the shape, presence, etc. of the moire fringe occurrence region. It is possible to determine whether the volume hologram recording body 29 'is true or fake.
[0055]
In order to facilitate such authenticity determination, it is desirable to record so that the reproduced image of the planar pattern is reproduced in the vicinity of the hologram surface of the volume hologram recording body 29 ′.
[0056]
As described above, the volume hologram recording body of the present invention has been described based on the embodiments. However, the present invention is not limited to these embodiments, and various modifications are possible.
[0057]
【The invention's effect】
As is clear from the above description, according to the volume hologram recording body of the present invention, the image of the three-dimensional object and the image of the planar pattern are objects having the same incident angle and the same reference light having the same wavelength and different incident angles. Since it is double-recorded as a reflection hologram due to interference with light, a three-dimensional image of a three-dimensional subject is reproduced in one color with an angular relationship close to the recording conditions, and the image of the planar pattern has various white illumination light incident angles In addition, the image is reproduced with a different color depending on the incident angle, is excellent in design, and has high security by determining whether or not it has such characteristics.
[0058]
Further, according to another volume hologram recording material of the present invention, a plurality of planar pattern images are formed as a reflection hologram by interference with the same reference light having the same incident angle and the same wavelength and the object light having different incident angles. Since multiple recording is performed, images of a plurality of plane patterns are reproduced as images of different colors continuously at different observation positions relatively continuously with respect to the volume hologram recording body, and are excellent in design. In addition, it is possible to obtain high security by determining whether or not such characteristics are provided.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a process for preparing a first hologram master used for recording a volume hologram recording body according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining a process for producing a second hologram master used for recording a volume hologram recording body according to an embodiment of the present invention.
FIG. 3 is a diagram for explaining a process for producing a volume hologram recording body according to an embodiment of the present invention from a first hologram original plate and a second hologram original plate.
4 is a diagram for explaining the reproduction characteristics of the volume hologram recording body created in FIG. 3. FIG.
FIG. 5 is another diagram for explaining the reproduction characteristics of the volume hologram recording body created in FIG. 3;
FIG. 6 shows the diffraction efficiency of the diffracted light for reproducing the image of the three-dimensional object in one reproduction state of the volume hologram recording body of one embodiment of the present invention and the diffracted light for reproducing the image of the planar pattern in each case. It is a figure which shows a wavelength dependence and a diffraction angle characteristic.
FIG. 7 is a view similar to FIG. 6 in another playback state.
FIG. 8 is a view similar to FIG. 6 in yet another playback state.
FIG. 9 is a diagram for explaining a process for producing a volume hologram recording body according to another embodiment of the present invention from a first hologram original and three second hologram originals.
[Explanation of symbols]
1 ... Volume hologram sensitive material
1 '... Transmission hologram
2 ... Scattered light (object light)
2 '... Diffracted light (object light)
2 "... Diffracted light (object light)
3 ... Reference light
3 '... Reproduction illumination light
4 ... Reference light
11 ... Volume hologram sensitive material
11 '... 1st hologram master
21 ... Volume hologram sensitive material
21 '... Hologram sensitive material partially deactivated
21 "... 2nd hologram master
21 "a, 21" b, 21 "c ... three second hologram masters
22 ... Mask plate
23 ... Light such as ultraviolet rays to be deactivated
24 ... one-dimensional diffuser
25. Illumination light
25 ', 25'a, 25'b, 25'c ... Diffracted light (object light)
26 ... Reference light
27 ... Illumination light (reference light)
29 ... Volume hologram sensitive material
29 '... Volume hologram recording body
30 ... White illumination light
31, 31 ', 31 "... diffracted light
32'a, 32'b, 32'c, 32 "a, 32" b, 32 "c ... diffracted light
O ... 3D subject
O '... 3D image of the subject
O ”… 3D reconstructed image
E ... Observer eyeball

Claims (14)

3D object image and the image of the plane pattern, Ri at the same angle of incidence name is double recorded as a reflection hologram by the interference of the object beam of the same reference beam and mutually different angles of incidence of the same wavelength,
The hologram of the image of the plane pattern is selectively recorded only in a region corresponding to the plane pattern, and is recorded as a hologram made of interference fringes parallel in at least one section forming an angle with respect to the recording surface,
The image of the three-dimensional object is reproduced in one color with an angle relationship close to the recording conditions, and the image of the planar pattern is reproduced in various white illumination light incident angles and different colors according to the incident angles. volume hologram recording body, characterized in that. The cross section includes a normal of the recording surface, and the hologram of the image of the planar pattern is substantially the same side of the normal of the recording surface where the incident angle of the object light and the incident angle of the reference light are within the cross section. A hologram of an image of a three-dimensional object is recorded with an angle relationship in which the central ray of the object light is incident substantially perpendicular to the recording surface. The volume hologram recording body according to claim 1 , wherein the volume hologram recording body is recorded. 3. The volume hologram recording body according to claim 1, wherein the hologram of the image of the planar pattern is recorded by interference between an object beam that diffuses only in a direction orthogonal to the cross section and a reference beam. . The volume hologram recording body according to any one of claims 1 to 3 , wherein the image of the planar pattern is an image of a chromatic pattern or a micro character. The volume hologram recording body according to any one of claims 1 to 3 , wherein the image of the planar pattern is a line or halftone dot image. At least one two or more different volume hologram recording body according to any one of claims 1 5, characterized in that formed by multiple recording at the wavelength of the image of the image and the plane pattern of the three-dimensional object. Volume hologram recording body according to any one of claims 1 to hologram photosensitive material characterized by comprising the photopolymer 6. Images of a plurality of plane pattern is Ri Na multiplexed recorded as a reflection hologram in the same incident angle by interference between the object light of the same reference beam and mutually different angles of incidence of the same wavelength,
Each hologram of the plurality of planar pattern images is selectively recorded only in an area corresponding to the planar pattern, and is recorded as a hologram composed of interference fringes parallel in at least one section forming an angle with respect to the recording surface. Has been
The volume hologram recording body, wherein the images of the plurality of plane patterns are reproduced as images of different colors continuously at different observation positions relatively continuously with respect to the volume hologram recording body. The three-dimensional object image is a reference beam having the same incident angle and the same wavelength as the reference beam when recording the plurality of plane pattern images, and the object when recording the plurality of plane pattern images. 9. The volume hologram recording body according to claim 8 , wherein multiple recording is performed by interference between the light and object light having an incident angle different from that of the light. Volume hologram recording material according to claim 9 Symbol mounting image is characterized by comprising the image of the same plane pattern of said plurality of plane pattern. Each of the hologram image of said plurality of planar patterns, according to claim 9 or 10, wherein the recorded by interference between object light and reference light diffused only in a direction perpendicular to the cross-section Volume hologram recording body. The volume hologram recording body according to any one of claims 8 to 11 , wherein the images of the plurality of planar patterns are multiplexed and recorded at two or more different wavelengths. 3D object image and the image of the plane pattern, Ri at the same angle of incidence name is double recorded as a reflection hologram by the interference of the object beam of the same reference beam and mutually different angles of incidence of the same wavelength, the plane The hologram of the pattern image is selectively recorded only in a region corresponding to the planar pattern, and is recorded as a hologram composed of interference fringes parallel in at least one section that forms an angle with respect to the recording surface. The image of the three-dimensional object is reproduced in one color with an angular relationship close to the recording condition, and the image of the planar pattern is reproduced in various white illumination light incident angles and different colors according to the incident angles. In the method for determining the authenticity of the hologram recording body,
A line film or halftone dot image is recorded as an image of the plane pattern, and a pattern film on which a line or dot of the same pitch as the plane pattern of the line or halftone dot is drawn is used as the volume hologram recording body. The volume hologram recording is characterized in that the authenticity of the volume hologram recording body is determined by using moire fringes generated between the image of the plane pattern and the plane pattern of the lines or halftone dots of the pattern film. Body authenticity determination method. 14. The method for determining the authenticity of a volume hologram recording body according to claim 13, wherein the image of the planar pattern is recorded so as to be reproduced near the hologram surface of the volume hologram recording body.

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