JP2002215011A - Method for manufacturing color hologram by hologram duplication method, and method for manufacturing color hologram original plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method or manufacturing a volume type color hologram which exhibits no deviation of the visual area in each color and which presents a bright color image when an image is reproduced from a duplicated hologram. SOLUTION: In a method for producing color holograms by the hologram duplication method from a hologram original plate in which the volume holograms of separate colors are recorded on a plurality of hologram sensitive material layers 11R, 11G, and 11B, the angles of incidence IOR, IOG, and IOB of respective reference beams 12R, 12G, and 12B of each color are changed and recorded for every color when recording the volume hologram on each hologram sensitive material layers 11R, 11G, and 11B of the hologram original plate so that the difference of the contraction of the hologram sensitive material 11R, 11G, and 11B for each color of the hologram original plate is compensated.

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 color hologram by a hologram duplication method and a method for producing a color hologram master used in the method. The present invention relates to a method for producing a color hologram capable of producing a color hologram capable of observing an image and a method for producing a color hologram master for that purpose.

[0002]

2. Description of the Related Art As a method for producing a color volume hologram, first, a first color hologram is produced by two-beam interference, and then the first color hologram is reproduced to reproduce the first color hologram. Second away from
And a method of producing a color hologram with a multi-layer structure by sequential exposure by the Denisyk method, a method of producing a color hologram by simultaneous exposure, and the like.

Further, when a volume hologram is copied from a volume hologram on which a scattering object is recorded by a hologram duplication method, unnecessary interference fringes are removed to obtain a hologram capable of restricting a viewing area of an observed image and observing a bright image. A method is disclosed in JP-A-10-340038.

[0004]

When the H1H2 method is used, it is possible to obtain a hologram capable of observing an image with a limited viewing zone. There is a bad problem.

[0005] In addition, the Denishook method has a problem that unnecessary interference fringes are generated due to a large amount of specular reflection components and a problem that only a dark image can be observed due to a wide viewing area. JP-A-10-
Using the replication method disclosed in US Pat.
Although it is possible to obtain a volume hologram in which the process is simple and the viewing zone is controlled, when the contraction rates of the recording layers for R (red), G (green), and B (blue) of the hologram master are different,
There is a problem that the visual field in which a reproduced image can be observed is shifted for each color.

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 hologram master having a plurality of volume hologram photosensitive materials having different shrinkage rates as hologram photosensitive materials for each color. When a color hologram is produced by the hologram duplication method using a hologram, a method of producing a volume type color hologram that can obtain a bright color image without deviation of the visual field in each color when reproducing the duplicated hologram, and a color hologram master for that purpose Is to provide a method for producing the same.

[0007]

According to the present invention, there is provided a method for producing a color hologram by a hologram duplication method, comprising the steps of: preparing a hologram from a hologram master in which volume holograms of different colors are recorded in a plurality of hologram photosensitive material layers; In a method of producing a color hologram by a replication method,
The incident angle of the reference light of each color when recording a volume hologram on each hologram light-sensitive material layer of the hologram master, for each color, so as to compensate for the difference in the shrinkage rate of the hologram light-sensitive material layer for each color of the hologram master. This method is characterized in that recording is changed.

In this case, when a color hologram is copied from the hologram master to a single hologram sensitive material layer by the hologram copying method, the incident angles of the reproduced illumination lights of the respective colors incident on the hologram master can be made substantially the same. .

Another method of producing a color hologram by a hologram duplication method according to the present invention is a method of producing a color hologram by a hologram duplication method from a hologram master in which volume holograms of different colors are recorded on a plurality of hologram photosensitive material layers. The hologram when a color hologram is copied from the hologram master to a single hologram light-sensitive material layer by a hologram copying method so as to compensate for a difference in shrinkage rate of a hologram light-sensitive material layer for each color of the hologram master. This method is characterized in that the reproduction illumination light of each color incident on the original plate is duplicated while changing the incident angle for each color.

In this case, the incident angles of the reference lights of the respective colors when recording the volume hologram on each hologram sensitive material layer of the hologram master can be made substantially the same.

The method for producing a color hologram master according to the present invention is a color hologram master used for producing a color hologram by a hologram duplication method, wherein volume holograms of different colors are recorded on a plurality of hologram photosensitive material layers. In the method for producing a color hologram master
The incident angle of the reference light of each color when recording a volume hologram on each hologram light-sensitive material layer of the hologram master, for each color, so as to compensate for the difference in the shrinkage rate of the hologram light-sensitive material layer for each color of the hologram master. This method is characterized in that recording is changed.

In the present invention, the reference light of each color when recording a volume hologram on each hologram sensitive material layer of the hologram master is compensated for the difference in shrinkage of the hologram sensitive material layer for each color of the hologram master. Incident angle of reconstructed illumination light of each color incident on the hologram master when recording by changing the incident angle for each color, or when copying a color hologram from the hologram master to one hologram photosensitive material layer by the hologram duplication method Is changed for each color, so even if the contraction rate of the hologram photosensitive material layer for each color of the hologram master is different, the color hologram copied from the hologram master has no shift in the visual field for each color. No color shift occurs, and a bright color image can be observed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The method of producing a color hologram by the hologram duplication method of the present invention takes into account the difference in shrinkage of the hologram photosensitive material for each color of the hologram master, and takes into account the difference in the reference light of each color when photographing the master. By changing the angle of incidence or the angle of incidence of the duplicate illumination light when photographing a duplicate product by the hologram duplication method for each color, there is no shift in the visual field in each color when reproducing the duplicate hologram, and This is a method for producing a volume type color hologram that can obtain a bright color image having a visual field of the above.

Hereinafter, first, Japanese Patent Application Laid-Open No.
No. 340038 describes the principle of the hologram duplication method, and the method for producing a color hologram of the present invention will be described based on the principle.

The principle of the hologram duplication method disclosed in JP-A-10-340038 will be described with reference to the drawings.

It is considered that a scattered object is recorded as a volume hologram (Denishook hologram), which is used as an original, and a hologram is duplicated by superimposing another recording material on the original.

First, as shown in FIG. 1, an illuminating light 2 is applied to an object O, and a scattered light 3 from the illuminating light 2 and a reference light 2 serving as the illuminating light interfere with each other in a volume hologram photosensitive material 1 such as a photopolymer. Record the hologram master. At this time, the object O
May be performed not by the 0th-order light 2 transmitted through the volume hologram photosensitive material 1 but by a branched light different from the light 2. The incident angle of the reference light 2 at the time of recording the original is I ₀ , and its wavelength is λ ₀ .

The shrinkage ratio of the volume hologram photosensitive material 1 (post-shrinkage ratio is δ, expressed by 1-δ, and 1 when there is no shrinkage) by ν ₀ due to post-processing of the original recorded in this way is ν _0. The change in the slant angle of the fringe (interference fringe) recorded therein (the angle formed by the normal to the fringe surface with respect to the normal to one surface of the volume hologram photosensitive material) is defined as τ ₀ .

As shown in FIG. 2, another volume hologram photosensitive material 4 is closely adhered to the original 1 'recorded and post-processed as shown in FIG. Illumination light 5 having a wavelength λ ₁ is incident from the side at an incident angle I ₁ , and a diffracted light 6 diffracted from the original 1 ′ interferes in the volume hologram photosensitive material 4 to perform hologram replication. In addition,
When the original 1 ′ is a transmission type, the illumination light 5 is incident from the original 1 ′ side.

The contraction rate of the volume hologram light-sensitive material 4 due to the post-processing of the hologram thus duplicated is ν ₁ , and the change in the slant angle of the fringe recorded therein is τ ₁ .

The average bending of the volume hologram light-sensitive materials 1 and 4
Folding rate n₁, The external refractive index is n ₀And

Now, as shown in FIG. 3, the volume hologram 4 'thus duplicated is illuminated with an illumination light 7 at an incident angle θ.
(Assumed illumination angle), and observation is performed from a direction centered on the angle φ (assumed observation center angle). Such a in order to allow observation, fringe 8 of at least slant angle S _g is must be replicated in a volume hologram 4 '.

Hereinafter, such a fringe 8 is reproduced.
Angle I of Illumination Light 5 at Duplication for Copying ₁Find the condition
But before that, the symbols are organized below.

I ₀ : Original recording reference light incident angle λ ₀ : Original recording wavelength ν ₀ : Original photosensitive material shrinkage ratio τ ₀ : Original fringe slant angle change I ₁ : Duplicating illumination light incident angle λ ₁ : Duplicating wavelength ν ₁ : Duplicated photosensitive material contraction rate τ ₁ : Duplicate fringe slant angle change n ₀ : Refractive index outside photosensitive material n ₁ : Refractive index inside photosensitive material θ: Assumed illumination angle φ: Assumed observation center angle S _g : Assumed slant angle For simplicity, When "'" is added to the angle in photosensitive materials 1 and 4,
The slant angle S _g is given by: S _g = (θ ′ + φ ′) / 2 = {sin ⁻¹ (n ₀ / n ₁ × sin θ) + sin ⁻¹ (n ₀ / n ₁ × sin φ)} 2.・ (1) must be satisfied.

[0025] Now, the original plate 1 'hologram 4, which was copied or post-processing the fringe of the slant angle S _g of the previous post-processing at the time of recording'
When copying as a fringe with the same slant angle S _g during copying, the pitch (distance between fringes) P _t0 at the time of copying (FIG. 2) the fringe with the slant angle S _g during recording in the master 1 ′ is P _t0 = ν ₀ n ₀ λ ₀ / {2n ₁ cos (I ₀ ′ −S _g −τ ₀ )} (2)

Further, the pitch P _t1 (slant angle S _{g-tau 1)} at the time of replication of the fringe slant angle S _g in the hologram 4 'duplicating-aftertreatment (FIG. 2), P _t1 = n ₀ λ ₁ / {2n ₁ cos (I ₁ ′ −S _g + τ ₁ )} (3)

The refractive indices of both photosensitive materials 1 and 4 are equal to n ₁ , and both the fringe to be duplicated of original 1 ′ and the fringe to be duplicated and recorded in photosensitive material 4 are duplicated while satisfying the Bragg condition. From the condition, P _t0 = P _t1 (4) From the above (1) to (4), the incident angle I ₁ of the illumination light 5 at the time of duplication.
Ν ₀ n ₀ λ ₀ / {2n ₁ cos (I ₀ ′ −S _g −τ ₀ )} = n ₀ λ ₁ / {2n ₁ cos (I ₁ ′ −S _g + τ ₁ )} ·· _{· (5) ν 0 λ 0} / cos (I 0 '-S g -τ 0) = λ 1 / cos (I 1' -S g + τ 1) cos (I 1 '-S g + τ 1) = λ 1 / (Ν ₀ λ ₀ ) × cos (I ₀ ′ −S _g −τ ₀ ) I ₁ ′ = ± cos ⁻¹ ｛λ ₁ / (ν ₀ λ ₀ ) × cos (I ₀ ′ −S _g −τ ₀₎ )｝ + S _g −τ ₁ sin ⁻¹ (n ₀ / n ₁ × sin I ₁ ) = S _g −τ ₁ ± cos ⁻¹ [λ ₁ / (ν ₀ λ ₀ ) × cos ｛sin ⁻¹ (n ₀ / _{n 1 × sinI 0) -S g} -τ 0}] I 1 = sin -1 "n 1 / n 0 × sin <± cos -1 [λ 1 / (ν 0 λ 0) × cos {sin -1 ( n ₀ / n ₁ × sin I ₀ ) − {sin ⁻¹ (n ₀ / n ₁ × sin θ) + sin ⁻¹ (n ₀ / n ₁ × sin φ)} / 2 −τ ₀ }] + {sin ⁻¹ (n _{0 / n 1 × sinφ) +} sin -1 (n 0 / n 1 × sinθ)} / 2 -τ 1>"= f (I 0, _{, Φ, ν 0, λ 1} / λ 0, n 1 / n 0, τ 0, τ 1) ··· (6) i.e., when replicated in the illumination light 5 incident angle I ₁ satisfying the expression (6), In the post-processed hologram 4 ', there are many fringes having various slant angles formed by the light 3 scattered in many directions from the object O during recording (FIG. 1).
A fringe having at least a specific slant angle S _g will eventually be replicated as a fringe 8 having the same slant angle S _g . In the above study, slant angle changes τ ₀ and τ ₁ were considered, but they can be ignored in an actual volume hologram photosensitive material.

Now, according to the present invention, a multicolor recording lip
A method for producing a man hologram will be described. Shown in FIG.
As described above, the R (red) light scattering unit 10_RAnd G (green) light scattering
Part 10_GAnd B (blue) light scattering section 10_BObject 1 consisting of
Consider making multi-color recording Lippmann holograms
I can. First, as shown in FIG.
R volume hologram sensitive material 11_RIn the R wavelength band
Wavelength λ_0RIllumination light 12_RIs the incident angle I_0RAnd R volume holog
Ram sensing material 11_RAnd the transmitted light is R
Light scattering unit 10_RScattered light and incident light 12_RAnd the R body
Hologram material 11_RR volume holograph
4B is recorded and post-processed.
Y, G volume hologram sensitive material 11_GSuperimposed, G wave
Wavelength λ in long band_0GIllumination light 12_GIs the incident angle I_0GG body
Hologram material 11_GFrom the side, and the transmitted light
G light scattering section 10 of object 10_GScattered light and incident light 1
2 _GAnd G volume hologram sensitive material 11_GLet me interfere in G
After recording and post-processing the volume hologram,
As shown in FIG. 4C, the B volume hologram photosensitive material 11_B
And the wavelength λ in the B wavelength band_0BIllumination light 12_B
Is the incident angle I_0BAnd B volume hologram sensitive material 11_BIncident from side
And the transmitted light is reflected by the B light scattering portion 10 of the object 10._BScattered by
Light and incident light 12_BAnd B volume hologram sensitive material 11
_BRecord the B volume hologram by interfering in
The superimposed body is referred to as an original 13 (FIG. 5).

Here, the R volume hologram photosensitive material 11 _R , G
Volume hologram sensitive material 11 _G , B volume hologram sensitive material 11
_When the contraction rates of _B are ν _0R , ν _0G , and ν _0B , these are generally not equal.

As is apparent from the above equation (6), I ₁ = f (I ₀ , θ, φ, ν ₀ , λ ₁ / λ ₀ , n ₁ / n
₀ , τ ₀ , τ ₁ ) can be expressed as follows: if the value of ν ₀ is different for each of the R, G, B colors, I _1R , I _1G , I _1B for these different colors, ie, duplicate illumination light incidence When trying to make the angles the same, θ, φ, λ ₁
If / λ ₀ , n ₁ / n ₀ , τ ₀ , τ ₁ are the same for these different colors, then I _0R , I _0G , I _0B , that is, the original recording reference light incident angle, Material shrinkage ν _0R , ν
_0G and ν _0B must be changed.

When the above equation (6) is rewritten into an equation in which I ₀ is the left side, the following equation is obtained.

I ₀ = sin ⁻¹ << n ₁ / n ₀ × sin <[sin ⁻¹ (n ₀ / n ₁ × sin θ) + sin ⁻¹ (n ₀ / n ₁ × sin φ)] / 2 + τ ₀ ± cos ^-1 [(ν ₀ λ ₀ ) / λ ₁ × cos ｛sin ⁻¹ (n ₀ / n ₁ × sin I ₁ ) − ｛sin ⁻¹ (n ₀ / n ₁ × sin θ) + sin ⁻¹ (n ₀ / n ₁ × sinφ)｝ / 2 + τ ₁ }] >> = g (I ₁ , θ, φ, ν ₀ , λ ₁ / λ ₀ , n ₁ / n ₀ , τ ₀ , τ ₁ ) (7) Therefore, when the original plate photosensitive material shrinkage ratios ν _0R , ν _0G , ν _0B are different for each color, the common I ₁ , θ, φ and the known λ ₁ / λ
₀ , n ₁ / n ₀ , τ ₀ , and τ are substituted into the right side of Equation (7), and ν _0R , ν _0G , and ν _0B that are different for each color are separately substituted, and the original plate as shown in FIG. 13 (FIG. 5) R, G,
Illumination light 12 _R for the photosensitive materials 11 _R , 11 _G , and 11 _B for _B ,
The incident angles I _0R , I _0G , and I _{0B of} 12 _G and 12 _B are obtained.

The incident angle I obtained in this way_0R,
I_0G, I_0B5 using the original 13 recorded with
As shown in FIG.
Sensitive to all R, G, B wavelength regions
Another volume hologram sensitive material 14 is arranged in parallel with the master 13
And the wavelength λ in the R wavelength band_1RLight and wavelengths in the G wavelength band
λ _1GLight and wavelength λ in the B wavelength band_1BLayered with the light of
Or duplicate illumination light 15 which is separately incident_RGBThe common incidence
Corner I₁When the light is incident from below the original 13, the object 10
An image 10 ′ is reproduced near the surface of the volume hologram photosensitive material 14,
The original 13 is duplicated on the volume hologram photosensitive material 14. this
Hologram copied and recorded in the volume hologram photosensitive material 14
Gram is a Lippmann-type three-color image hologram (image
Page hologram). The volume is
The hologram recorded in the hologram photosensitive material 14 is R,
G and B have the same θ and φ for both colors,
Does not occur. In addition, in the arrangement of FIG.
Of locating the program sensitive material 14 at the position of the object 10 during recording.
The reason is to make an image hologram,
And, of course, copy the original 13
May go.

Next, a specific example will be described. For R, G, B
In each case, the assumed illumination angle θ is 35 ° and the assumed observation center angle φ is −
5 °, refractive index n outside the photosensitive material₀1, the refractive index n in the photosensitive material₁1.
5. Original fringe slant angle change τ₀0, duplicate furin
JIS Slant angle change τ₁Is set to 0, and the original recording wavelength λ of R_0R
= Replication wavelength λ_1RIs 647.1 nm and the original recording wavelength λ of G is
_0G= Replication wavelength λ_1GIs 532 nm, the original recording wavelength λ of B_0B
= Replication wavelength λ_1BIs 457.9 nm, common to R, G, and B
Illumination light incident angle I of₁To set to 20 °
The original plate photosensitive material shrinkage ratio ν_0R, Ν_0G, Ν_0BIs 0.9
In the case of 87, 0.985, and 0.983, equation (7)
The original recording reference light incident angle I_0R, I_0G, I _0BAre each
30.23 °, 31.31 °, 32.32 °, small
Rounding off several points, 30 °, 31 °,
32 °. And such an incident angle I_0R= 30
°, I_0G= 31 °, I_0B= Original 13 recorded at 32 °
, R, G, and B common duplicate illumination light incident angle I₁= 20 °
Calculating the viewing zone of the replicated three-color image hologram,
As shown in FIG. In this case, the angle of incidence is
Is 35 °. In FIG. 6, the axis on the circumference indicates the angle.
The radial direction indicates brightness. R, G, B
The characteristics of the three colors are almost the same, and the viewing zones are the same, causing color shift.
Not come FIG. 7 shows the incidence of the original recording reference beam during the original recording.
Corner I_0R, I_0G, I _0BSimilar figures when all are set to 30 °
It is. In this case, it is apparent that the viewing zones of the three colors are shifted.
From the comparison between FIG. 6 and FIG. 7, the effectiveness of the present invention is clear.
It is.

From the above results, if the shrinkage rate of the hologram photosensitive material for each color constituting the original plate is known, it is possible to obtain a bright duplicate color hologram without any shift in the visual field, no color shift, and no color shift. I understand.

By the way, the difference in the shrinkage rate of each hologram sensitive material 11 _R , 11 _G , 11 _B of the original 13 is described above.
Original recording reference beam incident angles I _0R , I _0G , I at the time of original 13 recording
_By changing _0B for each color, the deviation of the visual field is eliminated in each color of the duplicated hologram so as to have a desired visual field. As is apparent from the equation (6),
I ₀ , θ, φ are commonly set, and ν _0R , ν different for each color
_0G , duplicated illumination light incident angles I _1R , I _1G , I _1B corresponding to ν _0B
Can also be requested.

That is, the incident angle I _0R of the illuminating light 12 _R , 12 _G , 12 _{B to} the R, G, B sensitive materials 11 _R , 11 _G , 11 _B when the master 13 as shown in FIG. The original 13 is manufactured by setting I _0G and I _0B to I ₀ common to each color, and then, as shown in FIG. 8, the R and G are positioned below the original 13 at the position where the object 10 was arranged at the time of recording. , And B are arranged in parallel with the master 13 so that the duplicate illumination light 16 _R of the wavelength λ _1R in the R wavelength band has an incident angle I _1R , and Illumination light 16 of wavelength λ _1G
G is the incident angle I _1G , and the duplicate illumination light 16 _B of the wavelength λ _1B in the B wavelength band is incident at the incident angle I _1B at the same time from below the original 13, and the image 10 ′ of the object 10 becomes a volume hologram sensitive material. The original 13 is reproduced near the fourteenth surface, and the original 13 is copied to the volume hologram photosensitive material 14. Thus, the volume hologram photosensitive material 14
The hologram replicated and recorded therein is a Lippmann-type three-color image hologram (image plane hologram). The hologram recorded in the volume hologram light-sensitive material 14 by this duplication has the same θ and φ for any of the R, G, and B colors, and there is no shift due to the color of the visual field.

A specific example of this case will be described. For each of R, G and B, the assumed illumination angle θ is 35 ° and the assumed observation center angle φ
-5 °, the refractive index n ₀ outside the photosensitive material is 1, the refractive index n ₁ inside the photosensitive material is 1.5, the fringe slant angle change τ ₀ of the original plate is 0, the fringe slant angle change τ ₁ of the duplicate is 0, and R Original recording wavelength λ _0R = duplication wavelength λ _1R is 647.1 nm, G original recording wavelength λ _0G = duplication wavelength λ _1G is 532 nm, B original recording wavelength λ _0B = duplication wavelength λ _1B is 457.9 nm, and R, G, B
When trying to set the common original recording reference light incident angle I ₀ to 31 °, when the original photosensitive material contraction rates ν _0R , ν _0G , ν _0B are 0.987, 0.985, 0.983 respectively, From equation (6), the incident angles I _1R , I _1G , and I _1B of the replicated illumination light are 21.79 °, 19.87 °, and 18.88 °, respectively.
0 ° and 19 °. Then, from the original 13 recorded at the common original recording reference light incident angle I ₀ = 31 °,
Different illumination light incident angles I _1R = 22 ° for R, G, B, I
_When the visual field of the three-color image hologram copied from the master 13 at _1G = 20 ° and I _1B = 19 ° is calculated, the result is as shown in FIG. In this case, the incident angle of the white reproduction illumination light is 35 °. From FIG. 9, the characteristics of the three colors R, G, and B are substantially the same.
The viewing zones match and no color shift has occurred. The effectiveness of this case is apparent from a comparison between FIG. 9 and FIG.

Although the method of producing a color hologram by the hologram duplication method of the present invention and the method of producing a color hologram master used in the method have been described based on the principle and the examples, the present invention is limited to these examples. However, various modifications are possible.

[0040]

As is clear from the above description, according to the method for producing a color hologram by the hologram duplication method of the present invention and the method for producing the color hologram master used in the method, the hologram sensitive material for each color of the hologram master is used. In order to compensate for the difference in the shrinkage of the layers, the angle of incidence of the reference light of each color when recording a volume hologram on each hologram sensitive material layer of the hologram master is recorded by changing the incident angle for each color, or from the hologram master. When a color hologram is copied to a single hologram light-sensitive material layer by a hologram copying method,
Since the reproduction angle of each color incident on the hologram master is duplicated while changing the incident angle for each color, even if the shrinkage ratio of the hologram photosensitive material layer for each color of the hologram master is different, it is copied from the hologram master. Color hologram
There is no shift in the visual field for each color, no color shift occurs, and a bright color image can be observed.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a method of recording a volume hologram master.

FIG. 2 is a diagram for explaining a hologram duplication method from a volume hologram master.

FIG. 3 is a diagram for explaining an assumed illumination angle and an assumed observation center angle of a copied volume hologram;

FIG. 4 is a diagram for explaining a method for producing a multicolor recording Lippmann hologram master according to one embodiment of the present invention.

FIG. 5 is a diagram for explaining a method of replicating a three-color image hologram from the hologram master shown in FIG.

FIG. 6 is a diagram illustrating a viewing zone of a three-color image hologram obtained according to one embodiment of the present invention.

FIG. 7 is a diagram illustrating a viewing zone of a three-color image hologram obtained by a comparative example.

FIG. 8 is a diagram for explaining a method of replicating a three-color image hologram from a hologram master according to another embodiment of the present invention.

FIG. 9 is a diagram illustrating a viewing zone of a three-color image hologram obtained according to another embodiment of the present invention.

[Explanation of symbols]

O: object 1: volume hologram sensitive material 1 ': original plate 2: illumination light (reference light) 3: scattered light 4: volume hologram sensitive material 4': volume hologram 5: illumination light 6: diffracted light 7: illumination light 8 ... fringe 10 ... object 10 '... image 10 of the object _R ... R (red) light scattering portion 10 _G ... G (green) light scattering portion 10 _B ... B (blue) light scattering portion 11 _R ... R volume hologram photosensitive material 11 _G ... G volume hologram photosensitive material 11 _B ... B volume hologram photosensitive material 12 _R ... illumination light 13 ... hologram master of the illumination light 12 _B ... B wavelength band of the illumination light 12 _G ... G wavelength band in R wavelength band 14 ... Another volume hologram light-sensitive material 15 _RGB : duplicate illumination light 16 _R : duplicate illumination light in the R wavelength band 16 _G : duplicate illumination light in the G wavelength band 16 _B : duplicate illumination light in the B wavelength band

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kenji Ueda 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 2K008 AA09 BB04 FF03 FF17 HH01

Claims (5)

[Claims] 1. A method for producing a color hologram by a hologram duplication method from a hologram master in which volume holograms of different colors are recorded on a plurality of hologram light-sensitive material layers, comprising: A hologram duplication method, comprising: changing the incident angle of reference light of each color for each color when recording a volume hologram on each hologram light-sensitive material layer of the hologram master so as to compensate for a difference in shrinkage ratio. Method of producing a color hologram according to the above. 2. The method according to claim 1, wherein when the color hologram is copied from the hologram master to one hologram sensitive material layer by a hologram copying method, the incident angles of the reproduction illumination lights of the respective colors incident on the hologram master are substantially the same. A method for producing a color hologram by the hologram duplication method according to claim 1. 3. A method of producing a color hologram by a hologram duplication method from a hologram master in which volume holograms of different colors are recorded on a plurality of hologram light-sensitive material layers, comprising: To compensate for the difference in shrinkage, 1
When a color hologram is duplicated by a hologram duplication method on a hologram light-sensitive material layer of a layer, a hologram duplication method is characterized in that duplication is performed by changing an incident angle of reproduction illumination light of each color incident on the hologram master for each color. How to make a color hologram. 4. The color hologram by the hologram duplication method according to claim 3, wherein when recording a volume hologram on each hologram light-sensitive material layer of the hologram master, incident angles of reference lights of respective colors are made substantially the same. Method of manufacturing. 5. A method for producing a color hologram master used for producing a color hologram by a hologram duplication method, wherein a volume hologram of different colors is recorded on a plurality of hologram photosensitive material layers. The angle of incidence of the reference light of each color when recording a volume hologram on each hologram photosensitive material layer of the hologram master so as to compensate for the difference in shrinkage of the hologram photosensitive material layer for each color of the hologram master. A method for producing a color hologram master, characterized in that recording is performed by changing the color hologram.