JP4905673B2 - Screen switching hologram manufacturing method and screen switching hologram manufactured by the method - Google Patents

Description

  The present invention relates to a screen-switching hologram manufacturing method and a screen-switching hologram manufactured by the method, and more particularly, to a volume hologram manufacturing method in which a 3D screen to be observed is switched according to the viewing direction and a volume hologram manufactured by the method. Is.

  There is a rainbow hologram as a screen switching hologram in which the screen to be observed is switched depending on the viewing direction. However, the rainbow hologram is a relief hologram, and the screen to be switched is a 2D screen, and each screen cannot be a 3D (three-dimensional) screen.

  On the other hand, a method described in Patent Document 1 is known as a method of making each screen a 3D screen. This method is a method in which a plurality of original volume holograms in which objects on each screen are recorded at a specific reference light incident angle by a Denniske method are duplicated and recorded in one volume hologram.

  However, in this method, a plurality of original volume holograms must be prepared, and the reference light incident angle when producing these original volume holograms must be set strictly.

On the other hand, when the position of the reproduced image is set to the surface of the recording material by the Denniske method for producing the hologram master in one stage, the screen switching hologram as described above cannot be produced.
JP 10-340038 A JP 2002-39910 A

  The present invention has been made in view of such problems of the prior art, and the object thereof is a method capable of producing a screen-switching hologram in which a 3D screen to be observed is switched according to the viewing direction with a simple configuration. It is to provide a screen switching hologram produced by the method.

  The screen-switching hologram manufacturing method of the present invention that achieves the above object is a screen-switching hologram manufacturing method in which the observation screen is switched depending on the viewing direction, and an object to be displayed on different screens is incident on a plurality of element hologram recording materials at the same incidence. Hologram recording is performed using angular reference light, and a plurality of element holograms are arranged in parallel to form a first-stage hologram, and object images recorded on each element hologram from the configured first-stage hologram It is a method characterized by simultaneously reproducing and recording a second-stage hologram recording material in the vicinity of the reproduced object image and recording it as a reflection type or transmission type volume hologram.

  Another screen switching hologram manufacturing method of the present invention is a full-color screen switching hologram manufacturing method in which the observation screen is switched depending on the viewing direction, and a plurality of element hologram recording materials are prepared for different colors, For each wavelength, holograms are recorded on a plurality of element hologram recording materials on different screens using reference light having the same angle of incidence, and the plurality of element holograms are arranged in parallel to form a first-stage hologram of each color. The object image of the corresponding color component recorded on each element hologram is simultaneously reproduced from each of the holograms constructed in the first stage, and the hologram recording material in the second stage is arranged in the vicinity of the reproduced object image. It is a method characterized by recording as a reflection type or transmission type volume hologram.

  In this case, the object image of the corresponding color component recorded in each element hologram is sequentially reproduced from a plurality of holograms in the first stage, and the second stage in which the color component corresponding to the vicinity of the reproduced object image can be recorded. A hologram recording material can be arranged and recorded as a reflection type or transmission type volume hologram.

  Then, while sequentially stacking the second stage hologram recording materials for different colors, the object images of different color components are reproduced in order from the plurality of first stage holograms, and the second stage hologram recording materials are sequentially stacked. Can be recorded.

  In the above, when the reference light is projected onto the surface of the first-stage hologram when the reference light is incident on the second-stage hologram, the plurality of element holograms of the first-stage hologram are arranged in parallel. It is desirable that the direction be substantially parallel to the direction.

  Further, in the parallel arrangement of a plurality of element holograms in the first stage hologram, the element holograms can be arranged in parallel so as to partially overlap each other.

  Further, it is desirable to use a silver salt photosensitive material as the first stage hologram recording material and to use a photopolymer as the second stage hologram recording material.

  In addition, it is desirable to use substantially parallel light as reference light used when recording the first stage hologram and the second stage hologram.

  The screen-switching hologram of the present invention comprises a volume hologram, and when irradiated with a predetermined reproduction illumination light, a plurality of object images are reproduced in the vicinity of the hologram surface, and a window is provided at a position spaced a predetermined distance from the hologram surface. It is recorded so as to be reproduced, and diffracted light for reproducing each of the plurality of object images is recorded so as to enter different areas of the window.

  In this case, the diffracted light for reproducing each of the plurality of object images may be recorded so as to be incident on a partially overlapping area in the window.

  It can also be recorded as a full-color hologram.

  According to the present invention, screen-switching holograms in which the observation screen is switched depending on the viewing direction can be collectively produced by the two-step method, and a screen-switching hologram capable of switching 3D screens can be easily produced. Moreover, the screen switching hologram according to the present invention can be used as a hologram having a high anti-counterfeiting effect and design properties, and can also be used as an optical element.

  Hereinafter, the screen switching hologram manufacturing method of the present invention and the screen switching hologram manufactured will be described based on examples.

  When producing a volume hologram by a two-step method, the screen switching hologram production method of the present invention records objects to be displayed on different screens on different hologram recording materials using reference light having the same incident angle, A plurality of recorded element holograms are combined in parallel or partially overlapped to produce a first-stage hologram (hereinafter referred to as an H1 hologram), and then a recorded object image is simultaneously generated from the H1 hologram. Reproducing, simultaneously reproducing a recorded object image from each element hologram of the H1 hologram, placing a hologram recording material for the second stage hologram in the vicinity of the reproduced object image, and reflecting or transmitting a volume hologram (hereinafter, This is a method of recording as H2 hologram).

Hereinafter, description will be given with reference to the drawings. FIG. 1 is a diagram showing a photographing arrangement of a plurality of element holograms constituting a first stage H1 hologram when a screen switching hologram is produced by a two-step method based on the present invention. In this embodiment, as the photosensitive material for recording element holograms, photosensitive materials 11 _{11 to} 11 ₁₃ made of silver salt material having higher sensitivity than the photopolymer are used. First, as shown in FIG. The first photosensitive material 11 ₁₁ is arranged facing the first object (shown here as a cube) O ₁ to be recorded on the first screen. Then, dissipate incident object light 1 ₁ scattered by the first object O ₁ is illuminated by the laser beam of the first object O ₁ a predetermined wavelength to the first photosensitive material 11 _11, the first photosensitive material 11 ₁₁ The reference light 2 ₁ consisting of parallel light from the same light source coherent with the object light 1 ₁ at the incident angle θ is simultaneously incident on the surface of the first light-sensitive material 11 _11, and the element hologram 11 ₁₁ of the first object O ₁ is incident on the first photosensitive material 11 _11. To expose. Here, the photosensitive material 11 ₁₁ and the element hologram 11 ₁₁ are denoted by the same reference numeral 11 ₁₁ . The other photosensitive materials 11 ₁₂ and 11 ₁₃ and element holograms 11 ₁₂ and 11 ₁₃ are the same.

Here, a silver salt material (silver salt sensitive material) is used for the photosensitive materials 11 _{11 to} 11 ₁₃ in place of the photopolymer, because a plurality of element holograms 11 constituting the first stage H1 hologram in the arrangement of FIG. _When photographing _{11 to} 11 ₁₃ , it is necessary to increase the distance between the objects O _{1 to} O ₃ and the photosensitive materials 11 _{11 to} 11 ₁₃ to some extent, but the objects O _{1 to} O ₃ and the photosensitive materials 11 _{11 to} 11 ₁₃ can be separated. distance intensity of the object beam 1 ₁ to 1 ₃ is weakened by releasing the. For this reason, a photopolymer having a lower sensitivity than that of a silver salt material results in a long exposure time, and a bright hologram cannot be produced. In addition, when a photopolymer is used, the incident angle to the recording material during recording and during reproduction changes due to the shrinkage, but the silver salt sensitive material is less affected by the shrinkage than the photopolymer. Therefore, a silver salt material is used for the photosensitive materials 11 _{11 to} 11 ₁₃ .

Further, as shown in FIG. 1 (b), the second object to be recorded in the second window (in this case are indicated by triangular pyramid.) Placing the second photosensitive material 11 ₁₂ facing the O ₂ To do. Then, the object beam 1 ₂ scatters the second object O ₂ in the first object O ₁ second by illuminating a laser beam having the same wavelength as in recording the hologram of the object O ₂ second photosensitive material 11 ₁₂ And the reference light 2 ₂ composed of parallel light from the same light source coherent with the object light 1 ₂ at the same incident angle θ as that of the reference light 2 ₁ is simultaneously incident on the surface of the second photosensitive material 11 ₁₂ . The element hologram 11 ₁₂ of the second object O ₂ is exposed to the second photosensitive material 11 ₁₂ .

Similarly, as shown in FIG. 1C, the third photosensitive material 11 ₁₃ faces the third object (shown here as a cylindrical body) O ₃ recorded on the third screen. Deploy. Then, the third object O ₃ first, the second object O _1, O ₂ of the object beam 1 ₃ scattered by the third object O ₃ is illuminated by a laser beam having the same wavelength as in recording the hologram first together to enter the third photosensitive material 11 _13, consisting of parallel light from the third light-sensitive material 11 reference light 2 ₁ to the face of _13, 2 ₂ and the object beam 1 ₃ at the same angle of incidence θ and coherent same source the reference beam 2 ₃ are incident at the same time, exposing the third object O ₃ element holograms 11 ₁₃ to the third photosensitive material 11 _13.

In this way, holograms of different objects O _{1 to} O ₃ are exposed and recorded on the respective element holograms 11 _{11 to} 11 ₁₃ using the reference light 2 ₁ to 2 ₃ having the same incident angle θ and the same wavelength.

The first to third photosensitive materials 11 _{11 to} 11 ₁₃ on which the separate holograms are exposed as described above are developed and bleached to produce element holograms 11 _{11 to} 11 ₁₃ .

Next, as shown in FIG. 2, a plurality of element holograms 11 _{11 to} 11 ₁₃ are arranged in parallel so as to be adjacent to each other to form an H1 hologram 11. Incidentally, the parallel process of a plurality of elemental holograms ₁₁ 11 to 11 ₁₃ may be arbitrary.

Then, the reproduction illumination light 3 that travels in the opposite direction to the reference beams 2 ₁ to 2 ₃ when the element holograms 11 _{11 to} 11 ₁₃ are recorded on the H 1 hologram 11 in which the element holograms 11 _{11 to} 11 ₁₃ are arranged in parallel is represented by H 1. When the hologram 11 is incident from the side opposite to the side on which the reference beams 2 ₁ to 2 ₃ are incident, the element holograms 11 _{11 to} 11 ₁₃ are recorded on the surface of the H1 hologram 11. object O ₁ ~ O ₃ of the element holograms in the same position as the relative position ₁₁ 11-11 by the diffracted light ₄₁ to ₃ from ₁₃ images O ₁ of the first to third objects O ₁ ~ O ₃ '~ O ₃ 'Is reproduced and imaged. If the positions of the _first to third objects O _{1 to} O ₃ are spatially overlapped with each other, the images O ₁ ′ to O ₃ ′ are also spatially overlapped to form an image. The second stage H2 hologram recording photosensitive material 21 is arranged in the vicinity of the position where the images O ₁ ′ to O ₃ ′ of the _first to third objects O _{1 to} O ₃ are imaged. A reference beam 5 consisting of parallel light from the same light source that interferes is incident simultaneously at an arbitrary incident angle from the opposite side or the same side as the diffracted beams 4 ₁ to 4 _3, and the second-stage H2 hologram is exposed in the photosensitive material 21. To do. In this embodiment, a photopolymer is used as the photosensitive material 21 for hologram recording at the second stage, and the exposed photosensitive material 21 is heated and irradiated with ultraviolet rays as post-processing to produce the H2 hologram 21. Here, the photosensitive material 21 and the H2 hologram 21 are denoted by the same reference numeral 21.

Here, the incident direction of the reference light 5 is a direction substantially parallel to the parallel direction of the plurality of element holograms 11 _{11 to} 11 ₁₃ of the H1 hologram 11 when the reference light 5 is projected onto the surface of the H1 hologram 11. It is preferable.

By the way, the photopolymer is used for the photosensitive material 21 without using the same silver salt material (silver salt sensitive material) as the photosensitive materials 11 _{11 to} 11 _{13. When the} silver salt material is used for the photosensitive material 21, the silver salt material is used. Is very sensitive, noise components from the H1 hologram 11 are also recorded on the photosensitive material 21. However, when a photopolymer is used, almost no noise components from the H1 hologram 11 are recorded, and the photopolymer itself This is because the transparency is high and the noise is low.

The H2 hologram 21 recorded as described above is a volume hologram. In the case of FIG. 2 in which the reference light 5 is incident from the side opposite to the diffracted lights 4 ₁ to 4 ₃ , the H2 hologram 21 is recorded as a reflection hologram. When the light is incident from the same side as the diffracted beams 4 ₁ to 4 ₃ , it is recorded as a transmission hologram.

As shown in FIG. 3, the reproduction illumination light 6 traveling in the opposite direction to the reference light 5 at the time of recording on the H2 hologram 21 recorded in this way is the reference light 5 at the time of recording with respect to the H2 hologram 21. when the incident from the opposite side, with the first to third objects O ₁ ~ O image O ₁ of ₃ images O ₁ of the '~O _3' "~O _3" is reproduced overlap spatially by the diffraction light 7 A window 25 having the same size as the recording surface of the H1 hologram 11 is reproduced at the position of the original H1 hologram 11. Then, among the first to third objects O ₁ image O ₁ of ~ O ₃ "~ O _3", the image O ₁ of the first object O ₁ "corresponds to the first element holograms 11 ₁₁ in the window 25 reproduced by the diffracted light component ₇₁ towards the range 25 _1, image O ₂ of the second object O ₂ "by diffracted light component 7 ₂ towards the range 25 ₂ corresponding to the second element holograms 11 ₁₂ in the window 25 is reproduced, the image O ₃ of the third object O ₃ "is reproduced by the diffracted light component 7 ₃ towards the range 25 ₃ corresponding to the third element holograms 11 ₁₃ in the window 25. Accordingly, the observing eye E in FIG. 3 is within the angle range α ₁ (the range 25 ₁ in the window 25 is the angle range in which the position where the reference light 5 of the H2 hologram 21 is incident), the image O ₁ ″ of the first object O ₁ (cube). Appears in the vicinity of the H2 hologram 21, and the angle range α ₂ (the range 25 ₂ in the window 25 is the H2 hologram 21. Of when the reference light 5 is in the angle range) looking into position to incident, visible on the image O ₂ "is H2 hologram 21 near the second object O ₂ (triangular pyramid), the angle range alpha ₃ (in window 25 of When the range 25 ₃ is in an angle range where the reference light 5 of the H2 hologram 21 is incident, the image O ₃ ″ of the third object O ₃ (cylindrical body) can be seen in the vicinity of the H2 hologram 21. Depending on the viewing direction, the observed screen is switched to the images O ₁ ″ to O ₃ ″. In addition, the images O ₁ ″ to O ₃ ″ of each object are three-dimensional (3D), and the three-dimensional screen is sequentially switched depending on the viewing direction. In FIG. 3, the cube, the triangular pyramid, and the cylinder illustrated in the angle ranges α _{1 to} α ₃ are illustrated to distinguish the stereoscopic images that can be seen in the corresponding angle ranges. It does not indicate the position where the image is reproduced. The reproduction position is the position of the images O ₁ ″ to O ₃ ″ near the H2 hologram 21.

In the case of configuring the H1 hologram 11, in the case of FIG. 2, the plurality of element holograms 11 _{11 to} 11 ₁₃ are arranged in parallel so as to contact each other. However, as shown in FIG. They may be arranged in parallel so as to overlap each other, or may be arranged in parallel with each other through a gap 14. In the H2 hologram 21 recorded from such an H1 hologram 11, as shown in FIG. 5 corresponding to FIG. 3, the range 25 ₁ corresponding to the first element hologram 11 ₁₁ in the window 25 and the second element overlap each other to the extent that the range 25 ₂ corresponding to the hologram 11 ₁₂ corresponding to a portion 13 of FIG. 4, the range 25 ₂ and the third element holograms 11 corresponding to the second element holograms 11 ₁₂ in the window 25 It is separated from the range 25 ₃ corresponding to ₁₃ within a range corresponding to the gap 14 in FIG. Correspondingly, the angle ranges α ₁ and α ₂ overlap in the angle range α ₁₂ , and the angle ranges α ₂ and α ₃ are separated in the angle range α ₂₃ . Both Therefore, when the observing eye E is in the angle range alpha ₁₂ in FIG. 5, the "image O ₂ of the second object O ₂ (triangular pyramid)" first object O ₁ image O ₁ of the (cubic) Is visible in the vicinity of the H2 hologram 21 and is in the angular range α ₂₃ , nothing is visible. Therefore, in FIG. 5, while moving the observation eye E from top to bottom, the cube is first visible, then both the cube and the triangular pyramid are visible, then the cube disappears and only the triangular pyramid is visible, and then nothing is visible. There is no area, and then the cylinder is visible.

Further, the plurality of element holograms 11 _{11 to} 11 ₁₃ are not limited to a rectangular shape having the same size, but may have any size and any shape and arrangement. FIG. 6 is a diagram showing an example thereof. FIG. 6A shows a case where element holograms 11 _{11 to} 11 ₁₉ are arranged in a two-dimensional matrix, and FIG. 6B shows element holograms 11 having different shapes. _This is a case where _{11 to} 11 ₁₃ are arranged two-dimensionally apart.

In the arrangement shown in FIG. 1, when divergent light is used as the reference lights 2 ₁ to 2 ₃ at the time of photographing the element holograms 11 _{11 to} 11 ₁₃ of the H1 hologram 11, the reproduction illumination light for producing the H2 hologram 21 shown in FIG. 3, the convergent light must be used, and it is necessary to generate convergent light that covers the entire area of the H1 hologram 11 using a convex lens having a larger aperture than that of the H1 hologram 11, and the recording apparatus becomes expensive. Therefore, by using parallel light as the reference light 2 _{1 to} 2 ₃ and the reproduction illumination light 3, a lens or a parabolic mirror having the same size as that of the H1 hologram 11 may be used.

In the above description, the number of screens to be switched according to the viewing direction is three, but the number can be any number of two or more, and the element holograms 11 ₁₁ to 11 of the H1 hologram 11 are changed according to the number of screens to be switched. The number of ₁₃ may be set and the holograms of the objects O _{1 to} O ₃ corresponding to the element holograms 11 _{11 to} 11 ₁₃ may be recorded.

  By the way, the screen switching hologram produced by the two-step method described above is a monochromatic hologram. One example of producing a full-color screen switching hologram by this method will be described below. In this embodiment, three R (red), G (green), and B (blue) holograms are each produced as a H1 hologram from a plurality of element holograms.

FIG. 7 is a diagram showing a photographing arrangement of a plurality of element holograms 11 _11R , 11 _12R , and 11 _13R constituting the _R H1 hologram 11 _R in the three first-stage H1 holograms. Basically, it is the same as in the case of FIG. 1, but as shown in FIG. 7A, the surface of the first object (shown here as a cube) O ₁ recorded on the first screen. Thus, the first photosensitive material 11 _11R for R having sensitivity to the wavelength λ _R of _R is disposed. Then, the first object O ₁ is illuminated with a laser beam having a specific wavelength λ _R (for example, 647.1 nm) of _R, and the object light 1 _1R scattered by the first object O ₁ is converted into the first photosensitive material 11 for R. together to enter the _11R, is incident reference light 2 _1R consisting collimated light from the first light-sensitive material 11 _11R object beam 1 _1R and coherent same light source at an incident angle θ on the surface of the R simultaneously, for R exposing the first photosensitive material 11 _11R first object O ₁ of R element holograms 11 _11R to the. Here, the photosensitive material 11 _11R and the element hologram 11 _11R are denoted by the same reference numeral 11 _11R . The other photosensitive materials 11 _12R and 11 _13R and element holograms 11 _12R and 11 _13R are the same.

Further, as shown in FIG. 7B, the second object to be recorded on the second screen (in this case, indicated by a triangular pyramid) O ₂ has a sensitivity _R to the wavelength λ _R of R. The second photosensitive material 11 _12R is disposed. Then, the second object O ₂ is illuminated with laser light having the same R wavelength λ _R as that when the hologram of the first object O ₁ is recorded, and the object light 12 _R scattered by the second object O ₂ is used for the R object. together to be incident on the second photosensitive material 11 _12R, the collimated light from the second light-sensitive material 11 _12R reference light 2 _1R and the object beam 1 _2R at the same incident angle θ as coherent same light source to the surface of the R The reference light 2 _2R is simultaneously incident, and the R element hologram 11 _12R of the second object O ₂ is exposed to the R second photosensitive material 11 _12R .

Similarly, as shown in FIG. 7C, the third object (shown here as a cylindrical body) recorded on the third screen faces O ₃ and is sensitive to the wavelength λ _R of _R. A third photosensitive material 11 _13R is disposed. Then, the third object O ₃ is illuminated with a laser beam having the same wavelength λ _R as that when the holograms of the first and second objects O ₁ and O ₂ are recorded, and the object light 13 _R scattered by the third object O ₃ is used. _Is incident on the third photosensitive material 11 _13R for R, and is incident on the surface of the third photosensitive material 11 _13R from the same light source that is coherent with the object light 1 _3R at the same incident angle θ as the reference lights 2 _1R and 2 _2R. The reference light 2 _3R composed of the parallel light is simultaneously incident, and the R element hologram 11 _13R of the third object O ₃ is exposed to the third photosensitive material 11 _13R for R.

The first to third photosensitive materials 11 _{11R to} 11 _13R for R, on which the separate holograms are exposed as described above, are developed and bleached to produce element holograms 11 _{11R to} 11 _13R for R.

In order to photograph a plurality of element holograms 11 _11G , 11 _12G , and 11 _13G constituting the H1 hologram 11 _G of _G , as shown in FIG. 8A, the first object O recorded on the first screen is recorded. _{A first} photosensitive material _1111G for G having a sensitivity to the wavelength λ _G of _G is disposed facing ₁ . The first object O ₁ is illuminated with a laser beam having a specific wavelength λ _G (for example, 532 nm) of _G, and the object light 1 _1G scattered by the first object O ₁ is applied to the first photosensitive material 11 _11G for G. causes incident, is incident first photosensitive material 11 reference light 2 _1G consisting collimated light from _11G plane the object beam 1 _1G and coherent same light source at an incident angle θ on the for G at the same time, the for G 1 of the photosensitive material 11 _11G exposing a first object O ₁ of G elemental hologram 11 _11G. Here, the photosensitive material 11 _11G and the element hologram 11 _11G are denoted by the same reference numeral 11 _11G . The other photosensitive materials 11 _12G and 11 _13G and element holograms 11 _12G and 11 _13G are the same.

Further, as shown in FIG. 8B, the second photosensitive material 11 _12G for G having sensitivity to the wavelength λ _G of _G is arranged facing the second object O ₂ recorded on the second screen. . Then, the second object O ₂ is illuminated with a laser beam having the same G wavelength λ _G as that when the hologram of the first object O ₁ is recorded, and the object light 12 _G scattered by the second object O ₂ is used for G. together to be incident on the second photosensitive material 11 _12G, the collimated light from the second light-sensitive material 11 _12G object beam 1 at the same angle of incidence θ and the reference light 2 _1G to the plane of _2G and coherent same light source for G The reference light 2 _2G is incident simultaneously, and the G element hologram 11 _12G of the second object O ₂ is exposed on the second photosensitive material 11 _12G for G.

Similarly, as shown in FIG. 8C, a third photosensitive material 11 _13G having sensitivity to the wavelength λ _G of _G is arranged facing the third object O ₃ recorded on the third screen. Then, the third object O ₃ is illuminated with a laser beam having the same wavelength λ _G as that when the holograms of the first and second objects O ₁ and O ₂ are recorded, and the object light 13 _G scattered by the third object O ₃ is used. the causes are incident on the third photosensitive material 11 _13G for G, the third photosensitive material 11 _13G reference light 2 _1G to the plane of, 2 _2G and the object beam 1 _3G at the same incident angle θ as coherent same source The reference light 2 _3G composed of parallel light beams is simultaneously incident, and the G element hologram 11 _13G of the third object O ₃ is exposed on the third photosensitive material 11 _13G for G.

The first to third photosensitive materials 11 _{11G to} 11 _13G for G on which the separate holograms are exposed as described above are developed and bleached to produce element holograms 11 _{11G to} 11 _13G for G.

Further, the plurality of element holograms 11 _11B , 11 _12B , and 11 _13B constituting the _B H1 hologram 11 _B are similarly photographed. The shooting arrangement in that case is shown in FIG. The description is the same as in the case of FIGS. However, as the specific wavelength λ _B of _B , for example, a laser beam having a wavelength of 476.5 nm) is used, and the first, second, and third photosensitive materials 11 _11B and 11 _12B for B having sensitivity to the wavelength λ _B of B are used. 11 _13B , the object beams 1 _1B , 1 _2B , 1 _3B and the reference beam 2 _1B , 2 _2B , 2 _3B interfere with each other, and the B element hologram 11 _11B , 2nd of the first object O ₁ The B element hologram 11 _12B of the object O _{2 and} the B element hologram 11 _13B of the third object O ₃ are exposed. Then, the first to third photosensitive materials 11 _{11B to} 11 _13B for B to which different holograms are exposed are developed and bleached to produce element holograms 11 _{11B to} 11 _13B for B.

Next, as shown in FIGS. 10 to 12, a plurality of element holograms 11 _{11R to} 11 _13R for _R , a plurality of element holograms 11 _{11G to} 11 _13G for _G , and a plurality of element holograms 11 _{11B to} 11 11 for _{B, respectively. 13B} are arranged in parallel so as to be adjacent to each other in the same manner as the monochromatic element holograms 11 _{11 to} 11 ₁₃ (FIGS. 2 and 4), and the R H1 hologram 11 _R , the G H1 hologram 11 _G , and the B H1 hologram, respectively. 11 _B.

Next, an example of a method for producing a second-stage H2 hologram using the above-described H1 holograms 11 _R , 11 _G , 11 _B will be described. First, as shown in FIG. 10, the reference beam 2 when recording the _R element holograms 11 _{11R to} 11 _13R on the R H1 hologram 11 _{R in} which the R element holograms 11 _{11R to} 11 _13R are arranged in parallel. wavelength lambda _R of the reproduction illumination light 3 _R traveling in the opposite and _1R to 2 _3R, is incident from the side opposite to the side where the reference light 2 _1R to 2 _3R when the recording with respect to H1 hologram 11 _R of R is incident And the _first position by the diffracted beams 4 _1R to 4 _3R from the element holograms 11 _{11R to} 11 _{13R at the} same positions as the relative positions of the objects O _{1 to} O ₃ at the time of recording with respect to the surface of the _R H1 hologram 11 _R. to third objects O ₁ ~ O ₃ of the image O _1R '~O _3R' of the R component is reproduced imaged. If the positions of the _first to third objects O _{1 to} O ₃ are spatially overlapped with each other, the images O _1R ′ to O _3R ′ are also spatially overlapped to form an image. The second-stage R wavelength λ _R affixed on the transparent substrate 22 near the position where the R component images O _1R ′ to O _3R ′ of the _first to third objects O _{1 to} O ₃ are imaged. An R H2 hologram recording photosensitive material 21 _R having a high sensitivity is arranged, and the reference light 5 _R composed of parallel light of the same wavelength from the same light source coherent with the reproduction illumination light 3 _R is diffracted into the diffracted lights 4 _1R to 4 _{1. 3R} is simultaneously incident at any angle of incidence from the opposite side or the same side as, exposes of H2 hologram 2-stage R in the photosensitive material 21 _R.

Thereafter, the photosensitive material 21 _R is post-processed to lose the photosensitivity (in this embodiment, a photopolymer is used as the photosensitive material 21 _R , 21 _G , 21 _B for the second stage hologram H2 recording, These photosensitive materials after exposure are heated and irradiated with ultraviolet rays as post-processing.) Further, as shown in FIG. 11, for G-recording of H2 hologram having sensitivity to _G wavelength λG in the second stage. A photosensitive material 21 _G is pasted. Then, the transparent substrate 22 is arranged at the same position as the relative position in FIG. 10, and the element holograms 11 _{11G to} 11 _{13G for G} are arranged in parallel at the same position instead of the H1 hologram 11 _R of R in FIG. Similarly, the G H1 hologram 11 _G is arranged, and similarly, the wavelength that travels in the opposite direction to the reference beams 2 _1G to 2 _3G when the _G element holograms 11 _{11G to} 11 _13G are recorded on the G H1 hologram 11 _G the lambda _G of the reproduction illumination light 3 _G, when the incident from the side opposite to the side where the reference light 2 _1G to 2 _3G when the recording with respect to H1 hologram 11 _G enters the G, the H1 hologram 11 _G of G the first to the same position as the relative position of the object O ₁ ~ O ₃ when the recording with respect to the plane by the diffraction light 4 _1G to 4 _3G from the element holograms 11 _11G to 11 _13G 3 objects O ₁ ~ O ₃ G component images O _1G ′ to O _3G ′ are reconstructed. In the vicinity of these G component images O _1G ′ to O _3G ′, the second stage G H2 hologram recording photosensitive material 21 _G attached on the transparent substrate 22 is located, and the reproduction illumination light 3 _G the reference light 5 _R and the same direction when the reference light 5 _G consisting of parallel light of the same wavelength from coherent same light source R, is incident simultaneously at the same incidence angle, the second stage in the photosensitive material 21 _G G H2 hologram is exposed.

Thereafter, the photosensitive material 21 _G is post-processed to lose the photosensitivity, and further, as shown in FIG. 12, a photosensitive material for B H2 hologram recording having sensitivity to the _B wavelength λ _B in the second stage. Paste 21 _B. Then, the transparent substrate 22 located 10, placed in the same position as the relative position of Figure 11, in the same position in place of H1 hologram 11 _G of G in FIG. 11, element holograms 11 _11B to 11 _13B for B There is disposed a H1 hologram 11 _B of formed by parallel B, similarly, opposite to the reference light 2 _1B to 2 _3B when the recording element holograms 11 _11B to 11 _13B for B in the H1 hologram 11 _B of the B When the reproduction illumination light 3 _B having the wavelength λ _B traveling to is incident on the _B H1 hologram 11 _B from the side opposite to the side on which the reference lights 2 _1B to 2 _3B are incident upon recording, the B H1 hologram 11 object O ₁ ~ O ₃ relative position each element in the same position as the hologram 11 _11B to 11 first to third object by the diffraction beam 4 _1B to 4 _3B from _13B O ₁ when the surface of the recording with respect to the _B ~ O ₃ of the B component image O _1B '~O _3B' of is reproduced imaged. In the vicinity of these B component images O _1B ′ to O _3B ′, the second-stage B H2 hologram recording photosensitive material 21 _B affixed on the transparent substrate 22 is positioned, and the reproduction illumination light 3 _B In the photosensitive material 21 _B , the reference light 5 _B consisting of parallel light of the same wavelength from the same light source coherent with the reference light 5 _R and _G is simultaneously incident in the same direction and the same incident angle as the reference lights 5 _R and 5 _G. Then, the second stage B H2 hologram is exposed.

Finally, the photosensitive material 21 _B is similarly post-processed to eliminate the photosensitivity, so that the second stage R H2 hologram (21 _R ), G H2 hologram (21 _G ), A full-color H2 hologram 21 ′ obtained by laminating _B H2 holograms (21 _B ) is obtained.

The H2 hologram 21 full color 'as well, as described with reference to FIG. 3, H2 hologram 21' reproduction illumination light 6 traveling in the opposite to the reference light 5 _R, 5 _G, 5 _B when the recorded, in this case When white light is incident on the H2 hologram 21 ′ (corresponding to the H2 hologram 21 in FIG. 3) from the side opposite to the reference light 5 _R , 5 _G , 5 _{B at} the time of recording, the first light is diffracted by the diffracted light 7. The RGB three-color images O ₁ ″ to O ₃ ″ of the third objects O _{1 to} O ₃ are reproduced while being spatially overlapped, and at the positions of the original H1 holograms 11 _R , 11 _G , 11 _B A window 25 having the same size as the recording surfaces of _R , 11 _G and 11 _B is reproduced. Then, the first to third in the object O ₁ image O ₁ of ~ O ₃ "~ O _3", a first image O ₁ of the object O ₁ "is the first element holograms 11 _11R in the window 25, 11 _11G , 11 _11B is reproduced by the diffracted light component 7 ₁ toward the range 25 _1, and the image O ₂ ″ of the second object O ₂ corresponds to the second element holograms 11 _12R , 11 _12G , 11 _12B in the window 25. reproduced by the diffracted light component 7 ₂ towards the range 25 ₂ to the image O ₃ of the third object O ₃ "in the range 25 ₃ corresponding to the third element holograms 11 _13R, 11 _13G, 11 _13B in window 25 ₃ is reproduced by the diffracted light component 7 _{3. The reference} eye 5 _R , 5 _G , 5 _{B of the} H2 hologram 21 is incident on the observation eye E in the angle range α ₁ (range 25 ₁ in the window 25). when a location angle range) that allow for the first object O ₁ (image O ₁ full color cube) " H2 'looks near, the angle range alpha ₂ (range 25 ₂ H2 hologram 21 in the window 25 (21 hologram 21 (21)' angle expected reference light 5 _R, 5 _G, 5 _B is incident position of) range ), The full-color image O ₂ ″ of the second object O ₂ (triangular pyramid) is seen in the vicinity of the H2 hologram 21 (21 ′), and the angle range α ₃ (the range 25 ₃ in the window 25 is the H2 hologram). when the 21 of the reference beam 5 _R, 5 _G, 5 _B is in the angle range) that allow for location of the incident, it third object O ₃ (the full-color image O ₃ of the cylinder) "appear in the vicinity of H2 hologram 21 Thus, the screen observed according to the viewing direction is switched to the full-color images O ₁ ″ to O ₃ ″. In addition, the images O ₁ ″ to O ₃ ″ of each object are three-dimensional (3D), and the three-dimensional screen is sequentially switched depending on the viewing direction.

10 to 12, the recording order from the H1 holograms 11 _R , 11 _G , and 11 _B is not limited to the order of R, G, and B, and may be in any order.

The full-color H2 hologram 21 ′ is prepared in the order described above by sequentially laminating RGB hologram recording photosensitive materials 21 _R , 21 _G and 21 _B on the common transparent substrate 22 as described above. Instead of exposing the color holograms, a single photosensitive material having photosensitivity for the R, G, and B colors may be exposed sequentially or simultaneously. However, for simultaneous exposure, the H1 holograms 11 _R , 11 _G , and 11 _B need to be stacked and reproduced simultaneously, but the H1 holograms 11 _R , 11 _G , and 11 _B are transmissive and have wavelength dependency. Since it is not high and has chromatic dispersion, a noisy hologram is recorded as the H2 hologram. However, such noise can be reduced by manufacturing the H1 holograms 11 _R , 11 _G , and 11 _B as a volume type and a reflection type.

In addition, the hologram recording photosensitive materials 21 _R , 21 _G , and 21 _B are sequentially laminated on the common transparent substrate 22, and the corresponding color holograms are not sequentially exposed, but the hologram recording photosensitive material 21 _R. , 21 _G and 21 _B may be exchanged in order, and the corresponding color H2 hologram may be exposed and recorded, and the recorded RGB H2 holograms may be stacked and integrated to form a full-color H2 hologram 21 ′. . In this case, each H2 hologram is exposed in order to compensate for the relative position between the holograms being shifted by the thickness of each hologram as a result of lamination, and the relative shift of the image position of each color component to be reproduced. At this time, it is necessary to adjust the distance from the H1 holograms 11 _R , 11 _G , and 11 _B for each color.

Further, the element holograms 11 _11R , 11 _12R , 11 _13R , 11 _11G , 11 _12G , 11 _13G , 11 _11B , 11 _12B , and 11 _13B constituting the H1 holograms 11 _R , 11 _G , and 11 _B are also as described above. In addition, although the photosensitive materials 11 _11R , 11 _11G , 11 _11B ; 11 _12R , 11 _12G , 11 _12B ; 11 _13R , 11 _13G , 11 _13B are used for each color, of course, R, G, B 3 colors are used. Multiple recording may be performed in a single photosensitive material having photosensitivity (in this case, three photosensitive materials are used instead of nine photosensitive materials). However, in that case, as described above, when manufactured as a transmission type, since the wavelength dependency is not high and there is chromatic dispersion, a noisy hologram is recorded as an H2 hologram. Such a noise can be reduced by manufacturing as a volume type and a reflection type.

In the case of producing the full-color screen-switching hologram shown in FIGS. 7 to 12, a plurality of H1 holograms 11 _R , 11 _G , and 11 _B are formed as in the case of the monochromatic hologram. The element holograms 11 _{11R to} 11 _13R ; 11 _{11G to} 11 _13G ; 11 _{11B to} 11 _13B are not only arranged in parallel so as to be in contact with each other, but also overlap with each other at a part 13 as described with reference to FIG. They may be arranged in parallel, or may be arranged in parallel with each other through the gap 14. The angle dependency of the switching of the observation image from the H2 hologram 21 ′ recorded from the H1 holograms 11 _R , 11 _G , and 11 _B is the same as that described for the monochromatic hologram.

  As described above, the screen switching hologram manufacturing method of the present invention and the screen switching hologram manufactured by the method have been described based on the embodiments. However, the present invention is not limited to these embodiments, and various modifications are possible. . For example, although different objects (cube, triangular pyramid, cylinder) are recorded on the plurality of element holograms constituting the H1 hologram, the same object may be recorded on each element hologram. Alternatively, for example, a series of different frames (scenes) of continuous movements of the same person or animal may be recorded. FIG. 13 is a diagram showing an example of a series of scenes. From the left to the right in the top row of frames in the upper diagram, from the left to the right in the middle, and then from the left to the right in the lower row. Shows how the horse runs. When a series of these scenes are recorded on the plurality of top-to-bottom element holograms constituting the H1 hologram, as shown in FIG. 14, while moving the observation eye E from top to bottom, The replay image is continuously switched, and a moving image effect that makes a horse seem to run can be obtained. In the case of a full-color hologram, the recorded object image may be reproduced in full color on a screen that is a screen change, and the monochrome recorded object image may be reproduced on another screen. The screen-switching hologram according to the present invention can be used as a hologram having a high anti-counterfeit effect and design properties, and can also be used as an optical element.

It is a figure which shows imaging | photography arrangement | positioning of the some element hologram which comprises the H1 hologram of the 1st step | paragraph at the time of producing a screen switching type hologram by a 2 step method based on this invention. It is a figure which shows the imaging arrangement | positioning of the H2 hologram of the 2nd step. It is a figure for demonstrating the effect | action of the produced screen switching type hologram. It is a figure for demonstrating the deformation | transformation of the parallel method of the element hologram which comprises the H1 hologram of the 1st step. It is a figure for demonstrating the effect | action of the screen switching type hologram produced by taking the parallel arrangement of FIG. It is a figure which shows the other example of arrangement | positioning of the element hologram which comprises an H1 hologram. It is a figure which shows imaging | photography arrangement | positioning of the some element hologram which comprises the R1 H1 hologram of the 1st step | paragraph, when producing a full-color screen switching type hologram based on this invention. It is a figure which shows imaging | photography arrangement | positioning of the some element hologram which comprises the H1 hologram of the 1st step | paragraph, when producing a full-color screen switching hologram based on this invention. It is a figure which shows imaging | photography arrangement | positioning of the some element hologram which comprises the H1 hologram of B of the 1st step | stage when producing a full-color screen switching type hologram based on this invention. It is a figure which shows the imaging arrangement | positioning of the R2 H2 hologram of the 2nd step. It is a figure which shows the imaging arrangement | positioning of the H 2 hologram of the 2nd step. It is a figure which shows the imaging arrangement | positioning of the H2 hologram of B of the 2nd step. It is a figure which shows the example of a series of scenes of the continuous motion recorded on a some element hologram. It is a figure for demonstrating that a moving image effect is acquired from the screen switching type hologram produced using the element hologram of FIG.

Explanation of symbols

1 ₁ to 1 ₃ ... object light 1 _1R , 12 _2R , 1 _3R ... R object light 1 _1G , 1 _2G , 1 _3G ... G object light 1 _1B , 1 _2B , 1 _3B ... B object light 2 ₁ to 2 ₃ ... Reference light 2 _1R , 2 _2R , 2 _3R ... R reference light 2 _1G , 2 _2G , 2 _3G ... G reference light 2 _1B , 2 _2B , 2 _3B ... B reference light 3 ... Reproduction illumination light 3 _R ... R reproduction illumination light 3 _G ... G reproduction illumination light 3 _B ... B reproduction illumination light 4 ₁ to 4 ₃ ... Diffraction light from element hologram 4 _1R to 4 _3R ... R diffraction light 4 from element hologram _1G to 4 _3G ... G diffracted light from element hologram 4 _1B to 4 _3B ... B diffracted light from element hologram 5 ... Reference light 5 _R ... R reference light 5 _G ... G reference light 5 _B ... B Reference light 6 ... reconstructed illumination light 7 ... diffracted light 7 _{1 to} 7 _N ... diffracted light component 11 ... H1 hologram 11 _R ... R H1 hologram 11 _G ... G H1 hologram 11 _B ... B H1 hologram 11 ₁₁ -11 ₁₉ Photosensitive material (element hologram)
11 _{11R to} 11 _13R ... Photosensitive material for R (element hologram for R)
11 _{11G to} 11 _13G ... Photosensitive material for G (element hologram for G)
11 _{11B to} 11 _13B ... Photosensitive material for B (element hologram for B)
13 ... Overlapping part 14 ... Gap 21 ... H2 hologram recording photosensitive material (H2 hologram)
21 '... H2 hologram 21 _R ... H2 hologram recording photosensitive material 21 _G ... H2 hologram recording photosensitive material 21 _B ... H2 hologram recording photosensitive material 22 ... transparent substrate 25 ... window for B for G for R full color 25 _{1 to} 25 _N ... O _{1 to} O ₃ corresponding to the element hologram of the window O ₁ ′ to O ₃ ′ Object image O ₁ ″ to O ₃ ″ Object image O _1R ′ to O _1R '... R component image of the object O _1G ' to O _1G '... G component image of the object O _1B ' to O _1B '... B component image of the object

Claims (11)

A screen-switching hologram manufacturing method in which an observation screen is switched depending on a viewing direction, in which an object to be displayed on a separate screen is recorded on a plurality of element hologram recording materials using a reference beam having the same incident angle, and the plurality of element holograms Are arranged in parallel to form a first-stage hologram, and object images recorded on the element holograms are simultaneously reproduced from the constructed first-stage hologram, and second-stage hologram recording is performed in the vicinity of the reproduced object image. A method for producing a screen-switching hologram, characterized in that a material is arranged and recorded as a reflection-type or transmission-type volume hologram. A full-color screen-switching hologram manufacturing method in which the observation screen is switched depending on the viewing direction, in which a plurality of element hologram recording materials are prepared for different colors, and a separate screen is provided on each of the element hologram recording materials for each wavelength of each color. The object to be displayed on the hologram is recorded using a reference beam having the same incident angle, and the plurality of element holograms are arranged in parallel to form a first-stage hologram of each color. The object image of the corresponding color component recorded on each element hologram is reproduced simultaneously, and a second-stage hologram recording material is arranged in the vicinity of the reproduced object image and recorded as a reflection type or transmission type volume hologram. A method for producing a screen switching hologram. A second-stage hologram recording material capable of simultaneously reproducing an object image of a corresponding color component recorded on each element hologram in order from a plurality of first-stage holograms and recording a color component corresponding to the vicinity of the reproduced object image 3. The method for producing a screen switching hologram according to claim 2, wherein the hologram is arranged and recorded as a reflection type or transmission type volume hologram. While sequentially stacking the second-stage hologram recording materials for different colors, the object images of different color components are reproduced in order from the plurality of first-stage holograms and recorded on the sequentially stacked second-stage hologram recording materials. The method for producing a screen switching hologram according to claim 3. When the reference light is projected onto the surface of the first-stage hologram, the incident direction of the reference light when recording the second-stage hologram is approximately the parallel direction of the plurality of element holograms of the first-stage hologram. 5. The method for producing a screen switching hologram according to claim 1, wherein the directions are parallel to each other. 6. The screen switching hologram manufacturing method according to claim 1, wherein in the parallel arrangement of the plurality of element holograms in the first stage hologram, the element holograms are arranged in parallel so as to partially overlap each other. . 7. A screen-switching hologram according to claim 1, wherein a silver salt photosensitive material is used as the first stage hologram recording material, and a photopolymer is used as the second stage hologram recording material. Manufacturing method. 8. The method for producing a screen switching hologram according to claim 1, wherein substantially parallel light is used as reference light used for recording the first stage hologram and the second stage hologram. It consists of a volume hologram, and when it is irradiated with a predetermined reproduction illumination light, a plurality of object images are reproduced in the vicinity of the hologram surface, and a window is recorded so as to be reproduced at a position separated from the hologram surface by a predetermined distance. The screen-switching hologram, wherein diffracted light for reproducing each of the plurality of object images is recorded so as to be incident on different areas of the window. 10. The screen-switching hologram according to claim 9, wherein diffracted light for reproducing each of the plurality of object images is recorded so as to be incident on a partially overlapping area in the window. The screen switching hologram according to claim 9 or 10, wherein the screen switching hologram is recorded as a full-color hologram.

Images