JPH11272153A - Method for producing multilayer hologram - Google Patents

Abstract

PROBLEM TO BE SOLVED: To multiply record holograms, etc., in good yield by reducing wastes of materials and time even in case of a failure in some multiple exposure. SOLUTION: Plural hologram photosensitive material layers 1(R), 1(G), and 1(B) are stacked and holograms having different characteristics are recorded in the respective hologram photosensitive material layers to form the multi- layered hologram. Here, the hologram layers 1(R), 1(G), and 1(B) which are provided on a temporary base material 2 and have the recorded holograms with the different characteristics are prepared and those hologram layers are transferred sequentially onto a final substrate 6 while aligning to form the hologram of multi-layered constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a multilayer hologram, and more particularly, to a hologram which requires holograms having a plurality of functions to be multiplexed and recorded in multiple layers, for example, R (red), G (green), The present invention relates to a method for producing a multilayer hologram such as a color hologram in which holograms of three colors B (blue) are recorded in separate layers and multiplexed.

[0002]

2. Description of the Related Art Conventionally, there are mainly two methods for producing a hologram in which holograms having a plurality of functions are multiplexed, such as a color hologram in which holograms of three colors RGB are multiplexed and recorded. Taking a color hologram as an example, one is a method of performing triple exposure using a panchromatic hologram photosensitive material while changing the wavelength to RGB, and the second method is a method of performing three exposures with sensitivity to each of RGB. This is a method of forming a layer of a hologram photosensitive material, and performing triple exposure while changing the wavelength on the photosensitive material. A method of sequentially exposing a hologram, in which film formation and exposure are repeated three times, and a method in which a three-layer hologram photosensitive material having sensitivity to each of RGB is formed into a multilayer film first, and then the RGB hologram is triple-exposed. It is.

[0003]

In any of the conventional methods described above, if the last or second exposure fails in three hologram exposures, the first or second exposure is wasted. become. Therefore, in the conventional method, if any of the multiple exposures fails, the hologram photosensitive material, recording time, and the like are wasted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to perform multiplex recording of a hologram having a plurality of functions such as a color hologram. It is an object of the present invention to provide a method for producing a hologram in which a waste of material and time is reduced and a yield is improved even if a failure occurs.

[0005]

According to the present invention, there is provided a method of manufacturing a multilayer hologram in which a plurality of hologram photosensitive material layers are laminated, and holograms having different characteristics are recorded in each hologram photosensitive material layer. In the method for producing a multilayer hologram, a plurality of hologram layers provided on a temporary base material and recorded with holograms having different characteristics are prepared,
The method is characterized in that a hologram having a multilayer structure is produced by sequentially transferring these hologram layers onto a final substrate while performing alignment.

In this case, it is desirable to provide a release layer between the temporary substrate and the hologram layer.

It is desirable to provide an adhesive layer at least between the final substrate and the hologram layer in contact with the final substrate. In that case, the adhesive layer may be one that develops adhesive strength by heating, for example.

Further, the temporary base is made of a porous material having a large number of through holes, and gas is injected from the back of the temporary base to separate the temporary base from the hologram layer. be able to.

Further, the temporary base is made of a porous material having a large number of through-holes, and holograms having different characteristics can be exposed and recorded on a hologram layer formed on the surface thereof.

Another method for producing a multilayer hologram according to the present invention is a method for producing a multilayer hologram in which a plurality of hologram photosensitive material layers are laminated and holograms having different characteristics are recorded in each hologram photosensitive material layer. A plurality of hologram layers having holograms having different characteristics recorded on the surface of the temporary base material by exhaust suction from the back of the temporary base material made of a porous material having a large number of This method is characterized in that a hologram having a multilayer structure is produced by sequentially transferring the hologram onto a final substrate while performing alignment.

[0011] Still another method for producing a multilayer hologram of the present invention is a method for producing a multilayer hologram in which a plurality of hologram photosensitive material layers are laminated and holograms having different characteristics are recorded in each hologram photosensitive material layer.
A plurality of hologram masters on which holograms having different characteristics are recorded are prepared, a hologram photosensitive material layer is formed on these hologram masters, and holograms having different characteristics are copied by irradiating duplicate illumination light from the hologram master side. The method is characterized in that a plurality of hologram layers are duplicated, and the hologram layers are sequentially transferred onto a final substrate while being aligned, thereby producing a hologram having a multi-layer structure.

In the above, alignment marks are holographically recorded on each of the plurality of hologram layers, and the alignment marks of the hologram layer transferred at the time of transfer and the hologram layers to be transferred next are transferred. It is desirable to perform alignment while aligning with the alignment mark, and to sequentially transfer these hologram layers onto the final substrate.

In this case, the alignment marks recorded on the plurality of hologram layers are used when the hologram layers are reproduced at a predetermined interval when the alignment is performed. Is desirably recorded so as to be reproduced on substantially the same plane.

According to the present invention, in a multilayer hologram in which a plurality of hologram photosensitive material layers are laminated and holograms having different characteristics are recorded in each hologram photosensitive material layer, a holographic mark is formed on each of the plurality of hologram layers. And a multilayer hologram characterized in that, when the hologram layers are stacked, a reconstructed image of the alignment mark is used to align the hologram layers.

In this case, it is desirable that the alignment marks recorded on the plurality of hologram layers are recorded such that the position of the reproduced image is reproduced at a different distance from each hologram layer.

In the present invention, in the production of a multilayer hologram in which a plurality of hologram photosensitive material layers are laminated and holograms having different characteristics are recorded in each hologram photosensitive material layer, an inspection step can be provided after each hologram recording. If any of the holograms is found to be defective in the inspection process, the recording may be repeated until the defective hologram becomes a non-defective product without being transferred onto the previously transferred hologram. Hologram recorded before that is not wasted, hologram photosensitive material,
A multilayer hologram can be manufactured with high yield without wasting recording time and the like.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for producing a multilayer hologram according to the present invention will be described below by taking a method for producing a color hologram as an example. From the following description, it is apparent that the method for producing a multilayer hologram of the present invention is not limited to the illustrated color hologram, but can be applied to any hologram in which holograms having a plurality of functions are multiplexed.

FIG. 1 is a diagram for explaining a process for producing a color hologram in the form of a multilayer hologram according to the present invention. The steps are (a), (b), (c), (d),
(E), (f), (g), (h), (i), and (j) are performed in this order, wherein (b), (e), and (h) indicate inspection steps. is there. In this example, the exposure of the hologram of three colors is R (red), G (green), and B (blue).
Shall be performed in this order.

First, in the step of FIG. 1 (a), an R hologram sensitive material layer 1 such as a photopolymer, a photoresist, a silver salt film or the like having a sensitivity to the wavelength of R (red) is formed on a temporary substrate 2 having a flat shape. (R) is formed into a film, and the R hologram light-sensitive material layer 1 is formed.
The object light 3 (R) and the reference light 4 (R) at a predetermined angle at (R).
And the R hologram is exposed.

After developing and fixing the R hologram exposed on the R hologram light-sensitive material layer 1 (R), the R hologram is inspected in the step of FIG. 1B to confirm that a predetermined R hologram is recorded. After the confirmation, the process proceeds to the transfer step of FIG.

In the transfer step shown in FIG. 1C, the temporary base material 2 is reversed, and the R hologram photosensitive material layer 1 (R) on which the R hologram is recorded is transferred onto the transparent substrate 6.
In this case, in order to facilitate transfer onto the transparent substrate 6, a release layer is provided on the surface of the temporary base material 2 as necessary, so that the R hologram light-sensitive material layer 1 (R) is easily released. Also,
An adhesive may be applied to the surface of the R hologram sensitive material layer 1 (R) or the transparent substrate 6 in order to easily transfer the R hologram sensitive material layer 1 (R) to the transparent substrate 6. The same applies to the transfer of the G hologram light-sensitive material layer 1 (G) and the B hologram light-sensitive material layer 1 (B) described below.

Next, in the step of FIG. 1 (d), G (this may be the same as or different from the one used in the step of FIG. 1 (a)) A green hologram light-sensitive material layer 1 (G) such as a photopolymer, a photoresist, or a silver halide film having sensitivity to the wavelength of (green) is formed, and the object light is formed on the G hologram light-sensitive material layer 1 (G) at a predetermined angle. 3 (G)
And reference light 4 (G) are incident, and the G hologram is exposed.

After developing and fixing the G hologram exposed on the G hologram light-sensitive material layer 1 (G), the G hologram is inspected in the step shown in FIG. 1E to confirm that a predetermined G hologram is recorded. After the confirmation, the process proceeds to the transfer step of FIG.

In the transfer step of FIG. 1 (f), the temporary base material 2 is turned over, and the G hologram light-sensitive material layer 1 (G) on which the G hologram is recorded is transferred in the step of FIG. 1 (c). After positioning the R hologram sensitive material layer 1 (R) on the transparent substrate 6 to which the R hologram sensitive material layer 1 (R) has been transferred,
The G hologram light-sensitive material layer 1 (G) is transferred from the temporary base material 2 onto the R hologram light-sensitive material layer 1 (R). This positioning will be described later.

Further, in the step of FIG. 1 (g), a temporary base material 2 in the form of a plate (which may be the same as or different from the one used in the steps of FIGS. 1 (a) and 1 (d)) is to be obtained. Is B (green)
Photopolymer, photoresist,
A B hologram sensitive material layer 1 (B) such as a silver halide film is formed, and object light 3 (B) and reference light 4 (B) are incident on the B hologram sensitive material layer 1 (B) at a predetermined angle. , B hologram is exposed.

After developing and fixing the B hologram exposed to the B hologram photosensitive material layer 1 (B), the B hologram is inspected in the step of FIG. 1 (h), and it is confirmed that a predetermined B hologram is recorded. After the confirmation, the process proceeds to the transfer step of FIG.

In the transfer step of FIG. 1 (i), the temporary base material 2 is turned over, and the B hologram light-sensitive material layer 1 (B) on which the B hologram is recorded is removed in the step of FIG. 1 (f). G hologram light-sensitive material layer 1 on R hologram light-sensitive material layer 1 (R)
After aligning the R hologram sensitive material layer 1 (R) and the G hologram sensitive material layer 1 (G) on the transparent substrate 6 to which (G) has been transferred, the G hologram sensitive material layer 1 (G) is aligned. The B hologram light-sensitive material layer 1 (B) is transferred from the temporary base material 2.

1 (a) to 1 (i), the three hologram photosensitive material layers 1 (B), 1 (1) on the transparent substrate 6 as shown in FIG. 1 (j). G), 1
A multilayer color hologram in which (G) is aligned and laminated in order is obtained.

As described above, in the method of the present invention,
Since an inspection process is provided after recording a single hologram of each color, those inspection processes (FIGS. 1 (b), (e), (h))
If it is found that a hologram of any color is defective, the hologram of the defective color is not transferred onto the previously transferred hologram, and recording can be repeated until the hologram of the defective color becomes a good product. The hologram recorded before that is not wasted, and the hologram photosensitive material, the recording time, and the like are not wasted.

By the way, in the hologram exposure process of each color shown in FIGS. 1A, 1D and 1G, the alignment marks 5 (R), 5 (G) and 5 (B) are put in the hologram of each color. It is desirable to record holographically. These alignment marks 5 (R), 5 (G), 5
(B) is arranged at a fixed position with respect to the object to be recorded, but when the alignment method of the arrangement shown in FIG. 2 described below is adopted, as shown in FIG.
(R) is at a distance L from the R hologram sensitive material layer 1 (R), and the alignment mark 5 (G) is the G hologram sensitive material layer 1.
Positioning mark 5 at a distance L-Δ from (G)
(B) is a distance L−Δ− from the B hologram light-sensitive material layer 1 (B).
δ, and at the same time, each of the reference beams 4 (R),
Illumination is performed at 4 (G) and 4 (B) to record holographically in the hologram of each color. Here, L is an arbitrary constant distance, Δ is the distance between the R hologram light-sensitive material layer 1 (R) and the G hologram light-sensitive material layer 1 (G) in the alignment arrangement of FIG.
Alternatively, the distance between the G hologram light-sensitive material layer 1 (G) and the B hologram light-sensitive material layer 1 (B), and δ is the G hologram light-sensitive material layer 1
(G) is the thickness.

FIG. 2 is a graph showing the relationship between R and R in the transfer step shown in FIG.
FIG. 2 is a view showing an arrangement for aligning a hologram light-sensitive material layer 1 (R) and a G hologram light-sensitive material layer 1 (G) to be transferred thereon, and is transparent before the transfer in the step of FIG. The R hologram light-sensitive material layer 1 (R) on the substrate 6 and the G hologram light-sensitive material layer 1 (G) on the temporary base material 2 are arranged in parallel at an interval Δ, and in the arrangement position, as shown in FIG. ) And (d), the illumination light 7 (R, R) obtained by adding the light traveling in the opposite direction at the same wavelength as the reference light 4 (R) and the light traveling in the opposite direction at the same wavelength as the reference light 4 (G). G) is incident from the temporary base material 2 side, and the image 5 ′ is placed at the position of the registration mark 5 (R) at the time of recording from the R hologram photosensitive material layer 1 (R).
(R) moves the image 5 ′ from the G hologram photosensitive material layer 1 (G) to the position of the registration mark 5 (G) at the time of recording.
(G) forms and reproduces images. At the time of recording, as described above, the alignment mark 5 (R) is aligned with the R hologram photosensitive material layer 1 (R).
Since the alignment mark 5 (G) is located at a distance L-Δ from the G-hologram photosensitive material layer 1 (G), the image 5 ′ of the alignment mark 5 (R)
(R) and the image 5 ′ (G) of the alignment mark 5 (G) are reproduced on the same plane. So, these images 5 '
(R) and 5 ′ (G) are enlarged and photographed by the electronic camera 8 and input to the processing device 9. As shown, the processing device 9 includes a mark image 10 (R) of the alignment mark 5 (R).
And mark image 10 (G) of alignment mark 10 (G)
Are superimposed and input, so that both mark images 10 (R), 1
By sending a feedback signal 11 from the processing device 9 to a position adjustment mechanism (not shown) so that 0 (G) is aligned with each other, and adjusting the position of the G hologram photosensitive material layer 1 (G) on the temporary base material 2, Both positions can be aligned.
Also, in the transfer step of FIG. 1 (i), the G hologram light-sensitive material layer 1 (G) and the B hologram light-sensitive material layer 1 to be transferred thereon
The alignment with (B) is performed in the same manner.

In the embodiment of FIG. 1, FIGS. 1 (c), (f),
In the transfer step (i), the hologram sensitive material layers 1 (R), 1 (G), and 1 (B) are easily transferred to the transparent substrate 6 side. (G), 1
(B) Although it has been described that it is desirable to apply an adhesive to the surface or the transparent substrate 6 side, FIG. 3 shows an example in which a heat-sealing adhesive that generates an adhesive force by heating is used as such an adhesive. This will be described with reference to FIG.

As shown in FIG. 3 (a), R
A hologram light-sensitive material layer 1 (R) is formed, the R hologram is exposed as shown in FIG. 1, developed and fixed, and a heat-sealable adhesive layer 12 is applied thereon to form a film. Then, FIG.
As shown in (b), when the temporary base material 2 is brought into close contact with the transparent substrate 6 on the side of the heat-sealable adhesive layer 12 and the whole is heated, the heat-sealable adhesive layer 12 is melted and acts as an adhesive, Since the R hologram sensitive material layer 1 (R) adheres to the transparent substrate 6, as shown in FIG. 3C, when the temporary base material 2 is separated, the R hologram sensitive material layer 1 (R) is placed on the transparent substrate 6 side. Is transferred to Also in this case, if a release layer is provided on the surface of the temporary base material 2, the R hologram photosensitive material layer 1 (R) is more easily transferred. In the transfer steps of FIGS. 1 (f) and 1 (i), similarly, the heat-sealing adhesive layer 12 is provided and heated at the time of transfer, so that the G-hologram light-sensitive material layer 1 (G) and the B-hologram light-sensitive material layer are heated. 1 (B) can also be transferred reliably.

As shown in FIG. 4 (a), the hologram-sensitive material layers 1 (R), 1 (G), and 1 (B) are peeled off from the temporary base material 2 without fail. Fine through hole 21
A temporary substrate 20 made of a porous material having a large number of An R hologram sensitive material layer 1 (R) is formed on the surface of the temporary base material 20 made of a porous material having such through holes 21, and the R hologram sensitive material layer 1 (R) is exposed to an R hologram. . In the case of FIG. 4B, this exposure step is shown as an embodiment in which a hologram is copied from an R hologram master 22 (R) such as a CGH (computer hologram) made of a chrome mask. That is, the R hologram master 22 (R) is placed in close contact with or apart from the R hologram photosensitive material layer 1 (R), the duplicate illumination light 23 is incident from the hologram master 22 (R) side, and its zero-order transmitted light is emitted. 24 and 1
The R hologram is exposed in the R hologram light-sensitive material layer 1 (R) by causing the next diffraction light 25 to interfere in the R hologram light-sensitive material layer 1 (R). After developing and fixing the R hologram, as shown in FIG.
(R) is brought into close contact with the transparent substrate 6 and the temporary base material 2 made of a porous material is used.
When the gas injection 26 is performed from behind, the R hologram photosensitive material layer 1 (R) is forcibly peeled off from the temporary base material 20. Accordingly, as shown in FIG. 4D, when the temporary base material 20 is separated, the R hologram photosensitive material layer 1 (R) is transferred to the transparent substrate 6 side. Also in this case, an adhesive may be applied to the surface of the R hologram photosensitive material layer 1 (R) or the transparent substrate 6.
1 (f) and 1 (i), a temporary substrate 20 made of a porous material having a large number of fine through holes 21 is similarly used as the temporary substrate, and gas is injected from behind the temporary substrate 20. 26, the G hologram light-sensitive material layer 1 (G) and the B hologram light-sensitive material layer 1 (B) are forcibly peeled off.

FIG. 5 shows another example in which a temporary base material 20 made of a porous material having many fine through holes 21 is used as the temporary base material. This embodiment is an example in which a hologram photosensitive material layer provided with a protective sheet 27 is used to suck and hold the hologram photosensitive material layer through the temporary base material 20. FIG. 5 (a)
As shown in the figure, a protective sheet 27 is laminated on the surface of the R hologram light-sensitive material layer 1 (R).
On the side, the R hologram sensitive material layer 1 (R) is adhered to the surface of the temporary base material 20 made of a porous material. In this state, when the exhaust suction 28 is performed from behind the temporary base material 20 made of a porous material, the R hologram photosensitive material layer 1 (R) is held in close contact with the temporary base material 20 via the protection sheet 27. In this state, as shown in FIG. 5 (b), the R hologram sensitive material layer 1 (R) is brought into close contact with the transparent substrate 6 and the exhaust suction 28 is stopped. 6 is transferred. Again,
An adhesive may be applied to the surface of the R hologram photosensitive material layer 1 (R) or the transparent substrate 6 in advance. Thereafter, as shown in FIG. 5C, the protective sheet 27 on the R hologram light-sensitive material layer 1 (R) is peeled off to prepare for the similar transfer of the next G hologram light-sensitive material layer 1 (G). Similarly, in the transfer process of FIGS. 1F and 1I, the exhaust suction 28 is performed from behind using the temporary base 20 made of a porous material having many fine through holes 21 as the temporary base. The G hologram light-sensitive material layer 1 (G) and the B hologram light-sensitive material layer 1 (B) on which the protective sheet 27 is laminated are suction-held.

In FIG. 6, instead of the temporary base material on which the hologram light-sensitive material layers for each color are laminated, a hologram light-sensitive material layer of the corresponding color is formed on a hologram master for duplicating each color, and the hologram light-sensitive material layers are sequentially transparent after the duplication. An example in which the image is transferred to the substrate 6 will be described. FIG. 6 (a)
As shown in FIG. 6B, an R hologram master 30 (R) having an R hologram surface 29 (R) such as a CGH (computer hologram) made of a chrome mask is used, and as shown in FIG. The R hologram sensitive material layer 1 (R) is formed directly on the surface of the 30 (R), and as shown in FIG. 6 (c), the duplicate illumination light 23 is incident from the hologram master 30 (R) side. The R hologram is duplicated in the R hologram light-sensitive material layer 1 (R) by causing the next transmitted light 24 and the first-order diffracted light 25 from the hologram master 30 (R) to interfere in the R hologram light-sensitive material layer 1 (R). . After developing and fixing the R hologram, as shown in FIG.
The hologram light-sensitive material layer 1 (R) is brought into close contact with the transparent substrate 6, and FIG.
As shown in (e), the R hologram photosensitive material layer 1 (R) is transferred to the transparent substrate 6 side by separating the R hologram master 30 (R). Also in this case, an adhesive may be applied to the surface of the R hologram photosensitive material layer 1 (R) or the transparent substrate 6. Similarly, G hologram light-sensitive material layers 1 (G), B copied from G hologram master and B hologram master
The hologram light-sensitive material layer 1 (B) is sequentially transferred.

Although the method for producing the multilayer hologram of the present invention has been described based on the embodiments, the present invention is not limited to these embodiments, and various modifications are possible.

[0038]

As is apparent from the above description, according to the method for producing a multilayer hologram of the present invention, a plurality of hologram photosensitive material layers are laminated, and holograms having different characteristics are recorded in each hologram photosensitive material layer. In the production of a multi-layer hologram, an inspection step can be provided after each hologram recording, and if any of the holograms is found to be defective in those inspection steps, the hologram previously transferred is placed on the hologram previously transferred. Recording can be repeated until the defective hologram becomes non-defective without transfer, and the hologram recorded before that is not wasted, hologram photosensitive material and recording time are not wasted, and multi-layer holograms are produced with high yield. can do.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a process of producing a color hologram in the form of a multilayer hologram according to the present invention.

FIG. 2 is a diagram showing an arrangement for aligning two hologram photosensitive material layers in a transfer step of FIG. 1 (f).

FIG. 3 is a diagram for explaining a manufacturing process of another embodiment.

FIG. 4 is a view for explaining a manufacturing process of still another embodiment.

FIG. 5 is a diagram for explaining a manufacturing process of another embodiment using a temporary base material made of a porous material.

FIG. 6 is a diagram for explaining a manufacturing process of an example in which a temporary base material is not used.

[Explanation of symbols]

 1 (R) ... R hologram light-sensitive material layer 1 (G) ... G hologram light-sensitive material layer 1 (B) ... B hologram light-sensitive material layer 2 ... Temporary base material 3 (R), 3 (G), 3 (G) ... Object light 4 (R), 4 (G), 4 (G) ... reference light 5 (R), 5 (G), 5 (B) ... alignment mark 5 '(R), 5' (G) ... position Image of alignment mark 6 ... Transparent substrate 7 (R, G) ... Illumination light 8 ... Electronic camera 9 ... Processing device 10 (R), 10 (G) ... Mark image of alignment mark 11 ... Feedback signal 12 ... Heat sealing property Adhesive layer 20: Temporary base material made of porous material 21: Fine through-hole 22 (R): R hologram master 23: Duplicated illumination light 24: Zero-order transmitted light 25: First-order diffracted light 26: Gas injection 27: Protection Sheet 28: Exhaust suction 29 (R): R hologram surface 30 (R): R hologram master

Claims (12)

[Claims] 1. A method for producing a multilayer hologram in which a plurality of hologram photosensitive material layers are laminated and holograms having different characteristics are recorded in each hologram photosensitive material layer, wherein the holograms having different characteristics provided on a temporary base material are provided. Preparation of a multilayer hologram characterized by preparing a plurality of recorded hologram layers and sequentially transferring these hologram layers onto a final substrate while aligning the hologram layers, thereby producing a hologram having a multi-layer structure. Method. 2. The method according to claim 1, wherein a release layer is provided between the temporary substrate and the hologram layer. 3. The method for producing a multilayer hologram according to claim 1, wherein an adhesive layer is provided at least between the final substrate and the hologram layer in contact with the final substrate. 4. The method for producing a multilayer hologram according to claim 3, wherein said adhesive layer develops an adhesive force by heating. 5. The temporary base is made of a porous material having a large number of through holes, and gas is injected from the back of the temporary base to separate the temporary base from the hologram layer. The method for producing a multilayer hologram according to claim 1, wherein 6. The multilayer hologram according to claim 5, wherein the temporary base is made of a porous material having a large number of through holes, and holograms having different characteristics are exposed and recorded on a hologram layer formed on the surface thereof. Production method. 7. A method for producing a multilayer hologram in which a plurality of hologram photosensitive material layers are laminated and holograms having different characteristics are recorded in each hologram photosensitive material layer, wherein a temporary base material made of a porous material having a large number of through holes is provided. Prepare a plurality of hologram layers holding holograms with different characteristics recorded on the surface of the temporary base material by exhaust suction from behind, and align these hologram layers on the final substrate. A method for producing a multilayer hologram, wherein a hologram having a plurality of layers is produced by sequentially transferring. 8. A method for producing a multilayer hologram in which a plurality of hologram photosensitive material layers are laminated and holograms having different characteristics are recorded in each hologram photosensitive material layer, wherein a plurality of hologram masters on which holograms having different characteristics are recorded are prepared. Then, a hologram photosensitive material layer is formed on these hologram masters, and duplicate illumination light is made incident from the hologram master side to duplicate a plurality of hologram layers in which holograms having different characteristics are duplicated. Characterized in that a hologram having a plurality of layers is manufactured by sequentially transferring the hologram onto a final substrate while performing alignment. 9. A positioning mark is holographically recorded on each of a plurality of hologram layers, and a positioning mark of a hologram layer transferred at the time of transfer and a position of a hologram layer to be transferred next. 9. The method for producing a multilayer hologram according to claim 1, wherein the alignment is performed while aligning with the alignment mark, and these hologram layers are sequentially transferred onto a final substrate. . 10. A positioning mark recorded on a plurality of hologram layers, when the hologram layers are reproduced with a predetermined interval between the hologram layers at the time of positioning, the marks of each positioning mark are reproduced. 10. The reproduced image is recorded so as to be reproduced on substantially the same surface.
A method for producing the multilayer hologram according to the above. 11. A multilayer hologram in which a plurality of hologram photosensitive material layers are laminated, and holograms having different characteristics are recorded in each hologram photosensitive material layer, and a positioning mark is holographically recorded in each of the plurality of hologram layers. A multilayer hologram, wherein a reproduced image of a positioning mark is used for positioning the hologram layers when stacking the hologram layers. 12. A positioning mark recorded on a plurality of hologram layers is recorded such that the position of a reproduced image is reproduced at a different distance from each hologram layer. 12. The multilayer hologram according to item 11.