JP5541439B2 - Hologram replication device, hologram replication method, and hologram replicated thereby - Google Patents

Description

  The present invention relates to a hologram duplicating device, a hologram duplicating method, and a hologram duplicated thereby, and more particularly to a hologram duplicating device for reproducing at a wavelength different from a recording wavelength, a hologram duplicating method, and a hologram duplicated thereby. .

  In recent years, image display devices and optical elements using lasers and LEDs as light sources have been developed. Since the hologram has a function of diffracting light of a specific wavelength in a specific direction, the light utilization efficiency is high with respect to the laser and LED narrow-band wavelength light source, and the device is miniaturized and a lens function diffuser function is added. Enable. Since the laser and the LED have different center wavelengths for each specification, a method of reproducing the hologram at a wavelength different from the recording wavelength is effective.

  Patent Document 1 discloses that a hologram is reproduced at a wavelength different from the recording wavelength. Further, Patent Document 2 is known as a method for mass-producing holograms.

JP-A-60-35701 Japanese Patent No. 2849021

M. Watanabe, D. Kodama, T. Matsuyama, and T. Hotta, "Mass-produced color graphic arts holograms", Proc. SPIE 3637, pp. 204-212, 1999

  The technique described in Patent Document 1 has the following problems. First, it does not support full-color reflection hologram recording, and it is difficult to achieve full color. Moreover, it does not correspond to the entire surface RGB, and mass production is difficult. Furthermore, since the recording is performed with laser beams having the same intensity, RGB cannot be balanced.

  Next, a replication method for mass production of holograms will be described. FIG. 15 is a diagram for explaining a process of copying to the second hologram recording photosensitive material 2 when recording and reproducing have the same wavelength, and FIG. 16 shows the second hologram 2 ′ duplicated in FIG. It is a figure for demonstrating the process to reproduce | regenerate. It is.

  First, the first surface 2a of the second hologram recording photosensitive material 2 is laminated on the first surface 1'a side of the first hologram 1 'as a hologram master, and the second surface 1'b side of the first hologram 1' is laminated. A back layer 3 that absorbs light having a wavelength around at least the recording wavelength is laminated.

  Next, when the first reproduction illumination light 21 is incident on the first hologram 1 ′, the first reproduction light 22 is diffracted, and the first reproduction light 22 is emitted from the first surface 2 a to the second hologram recording photosensitive material 2. Incident as second object light 31, the first reproduction illumination light 21 enters as second reference light 32 from the second surface 2 b and interferes. Thereafter, the second hologram recording photosensitive material 2 is post-processed to produce a second hologram 2 '.

  At the time of reproduction, as shown in FIG. 16, the second reproduction illumination light 41 traveling in the same direction as the second reference light 32 at the time of recording shown in FIG. , The second reproduction light 42 traveling in the same direction as the second object light 31 during recording shown in FIG. 15 is diffracted. Further, the second object light 31 at the time of recording is made incident on the second hologram 2 ′ by making the second reproduction illumination light 41 traveling in the direction opposite to the second reference light 32 at the time of recording incident from the first surface 2 ′ a. The second reproduction light 42 traveling in the opposite direction may be diffracted.

  When mass production of full-color holograms having RGB reproduction wavelengths using such a duplication method, as shown in Non-Patent Document 1, the reference light incident angle of the hologram master is the same for each color of RGB. By doing so, as shown in FIG. 17, the optical system for duplication can be made slightly compact. However, the RGB of the reference light at the time of duplication recording all enter the hologram at the same angle, and the wavelength and incident angle of the laser at the time of reproduction are determined. The diffraction efficiency decreases as the wavelength shifts. Therefore, it becomes difficult to use as a hologram element.

  In order to solve this, it is possible if the incident angles of the reference light at the time of duplication are different for RGB, but as shown in FIG. 18, an enlargement member such as a spatial filter is used as an optical system for duplication. 104, the parallel light conversion member 105 such as a collimating lens, and the holographic mirror 106 as an optical element need to be constructed separately for each of RGB, resulting in an increase in the size of an optical system for duplication.

  The present invention has been made in view of such problems of the prior art, and an object of the present invention is to compactly form an optical system for reproducing a hologram to be reproduced at a wavelength different from the recording wavelength with a simple structure. A hologram duplicating apparatus, a hologram duplicating method for duplicating a hologram to be reproduced at a wavelength different from the recording wavelength by a simple method, and a hologram duplicated thereby.

The hologram replication apparatus of the present invention that achieves the above object is
In order from one side, a hologram photosensitive material for duplication, a hologram master that reproduces at least one luminous flux of RGB at a reproduction wavelength different from that at the time of recording, a back layer that absorbs light having a wavelength around the recording wavelength of the hologram precursor, In the hologram duplicating apparatus for producing a duplicate hologram by irradiating each hologram light beam to the hologram master and the duplication hologram photosensitive material,
A laser irradiator for irradiating each of the R, G, and B lasers;
One parallel light beam, which is a combination of the R, G, and B light beams irradiated by the laser irradiator, is changed to the same angle as the reference light at the time of recording on the hologram master for each of the R, G, and B light beams. And an optical element that emits light toward the hologram master and the duplicate hologram photosensitive material,
It is provided with.

  The optical element may be a holographic mirror.

  Further, the holographic mirror is composed of a single piece, and changes an angle of at least one of RGB.

  The holographic mirror is characterized in that an R holographic mirror that changes the angle of R, a G holographic mirror that changes the angle of G, and a B holographic mirror that changes the angle of B are stacked. To do.

Furthermore, the hologram replication method of the present invention that achieves the above-described object is as follows.
Producing a hologram master that reproduces at least one luminous flux of RGB at a reproduction wavelength different from that at the time of recording;
In order from the one side, the step of laminating a replica hologram sensitive material, the hologram original plate, and a back layer that absorbs light having a wavelength around the recording wavelength;
Irradiating one parallel luminous flux in which the luminous fluxes of RGB are combined ;
Changing each of the one parallel light beam to an RGB light beam having the same angle as the reference light at the time of recording the hologram master by an optical element;
A light beam emitted from the optical element is incident on the hologram original plate and the hologram photosensitive material for duplication, and a hologram is duplicated;
It is characterized by having.

  Furthermore, the hologram of the present invention that achieves the above object is manufactured by the hologram duplication method.

  According to the present invention, a hologram duplicating apparatus that compactly forms an optical system for reproducing a hologram reproduced at a wavelength different from the recording wavelength with a simple structure, and a hologram reproduced at a wavelength different from the recording wavelength by a simple method Can be provided, and a hologram reproduced by the method can be provided.

It is a figure which shows the process for producing a reflection type hologram. It is a figure explaining the state of the interference fringe in the photosensitive material for 1st hologram recording at the time of recording. It is an enlarged view of an interference part. It is a figure for demonstrating the process of reproducing | regenerating 1st hologram 1 '. It is a figure explaining the state of the interference fringe in 1st hologram 1 'at the time of reproduction | regeneration. It is an enlarged view of the interference part in 1st hologram 1 '. It is a figure for demonstrating the process at the time of the hologram reproduction | regeneration in the case of changing the wavelength of R and B by the time of recording and reproduction | regeneration. It is a figure for demonstrating the process at the time of the hologram recording in the case of changing the wavelength of R and B by the time of recording and the time of reproduction | regeneration. It is a figure which shows the hologram duplication apparatus of 1st Embodiment. It is a figure which shows the example of a holographic mirror. It is a figure which shows the example of a holographic mirror. It is a figure which shows the hologram duplication apparatus of 2nd Embodiment. It is an enlarged view of a dichroic mirror. It is a figure which shows the optical element of 3rd Embodiment. It is a figure which shows the replication of the conventional hologram. It is a figure which shows reproduction | regeneration of the conventional duplicated hologram. It is a figure which shows the conventional hologram replication apparatus. It is a figure which shows the conventional hologram replication apparatus.

  Hereinafter, a hologram replication method according to the present invention and a hologram produced by the method will be described with reference to the drawings.

  First, a method for producing a hologram master will be described. FIG. 1 is a diagram showing a process for producing a first hologram, FIG. 2 is a diagram for explaining the state of interference fringes in the first hologram recording photosensitive material 1 during recording, and FIG. 3 is an enlarged view of an interference portion. is there.

  In the present embodiment, as shown in FIG. 1, a first object light 11 having a predetermined first wavelength λ and made of parallel light or substantially parallel light is applied to the first hologram recording photosensitive material 1 on the first surface on one side. At the same time, the first object light 11 made of parallel light or substantially parallel light is incident on the first hologram recording photosensitive material 1 from the second surface 1b opposite to the incident side of the first object light 11. The first reference light 12 having the same first wavelength λ is incident at a predetermined first incident angle.

  By causing the first object light 11 and the first reference light 12 to enter the first hologram recording photosensitive material 1, as shown in FIG. The first reference light 12 interferes.

  When the first object light 11 and the first reference light 12 interfere with each other, as shown in FIG. 3, the first object light 11 and the first reference light 12 have two angles formed in the first hologram recording photosensitive material 1. Interference fringes (dotted lines) are generated in the direction of the bisector. The interference fringes form an equal angle θ with respect to each of the first object light 11 and the first reference light 12. At this time, when the interference fringe interval is d and the recording wavelength is λ, each parameter satisfies the relationship 2d sin θ = λ.

  Thereafter, the first hologram recording photosensitive material 1 is post-processed to produce a first hologram 1 'as a hologram master.

  FIG. 4 is a diagram for explaining the process of reproducing the first hologram 1 ′, FIG. 5 is a diagram explaining the state of interference fringes in the first hologram 1 ′ during reproduction, and FIG. 6 is the first hologram 1 ′. It is an enlarged view of the inside interference part.

  At the time of reproduction, as shown in FIG. 4, the first reproduction illumination light 21 traveling in the same direction as the first reference light 12 at the time of recording shown in FIG. 1 is diffracted by the first reproduction light 22 traveling in the same direction as the first object light 11 at the time of recording shown in FIG. Further, the first object light 11 at the time of recording is made incident on the first hologram 1 ′ by making the first reproduction illumination light 21 traveling in the direction opposite to the first reference light 12 at the time of recording incident from the first surface 1 ′ a. The first reproduction light 22 traveling in the opposite direction may be diffracted.

  In the present embodiment, the first reproduction light 22 having a wavelength different from that at the time of recording is incident on the first hologram 1 ′ to diffract the first reproduction light 22.

  In order for the first reproduction light 22 to be diffracted in the same direction as the first object light 11 as shown in FIG. 5 by making the first reproduction illumination light 21 incident on the first hologram 1 ′, as shown in FIG. As described above, the first reproduction illumination light 21 and the first reproduction light 22 have the same angle θ ′ with respect to the interference fringes (dotted lines) in the first hologram 1 ′, and it is necessary to satisfy the Bragg reflection condition. At this time, when the interference fringe interval is d and the wavelength of the reproduction illumination light 21 is λ ′, the relationship of 2dsin θ ′ = λ ′ needs to be satisfied. At the same time, it is necessary to satisfy the relationship of 2dsinθ = λ.

  Here, when λ ′ = λ, θ ′ = θ is established, and the reproduction illumination light 21 having the same wavelength λ as the recording traveling in the same direction as the first reference light 12 at the time of recording the first hologram 1 ′ is incident. It will be the case.

  In the case of λ ′ <λ, in order to satisfy the relationship of 2dsinθ ′ = λ ′ and 2dsinθ = λ at the same time, the incident angle θ ′ of the first reproduction illumination light 21 to the interference fringes is smaller than the angle θ at the time of recording. '<Θ must be set. That is, the first reference light 12 having the wavelength λ is incident at an angle θ during recording and the wavelength λ smaller than the wavelength λ of the first reference light 12 during reproduction so that the relationship of 2dsinθ ′ = λ ′ and 2dsinθ = λ is satisfied simultaneously. The first reproduction illumination light 21 can be diffracted by being incident at an incident angle θ ′ to an interference fringe smaller than the angle θ of the first reference light 12.

  Further, when λ ′> λ, in order to satisfy the relationship of 2dsinθ ′ = λ ′ and 2dsinθ = λ at the same time, the incident angle θ ′ of the first reproduction illumination light 21 with respect to the interference fringes is set to be larger than the angle θ at the time of recording. It is necessary to largely set θ ′> θ. That is, the first reference light 12 having a wavelength λ is incident at an angle θ during recording so as to satisfy the relationship of 2dsin θ ′ = λ ′ and 2dsin θ = λ simultaneously, and the wavelength λ is larger than the wavelength λ of the first reference light 12 during reproduction. The first reproduction illumination light 21 can be diffracted by being incident at an incident angle θ ′ to an interference fringe larger than the angle θ of the first reference light 12.

  Thus, the wavelength λ and the angle θ of the first reference light 12 and the wavelength λ ′ and the angle θ ′ of the first reproduction illumination light 21 are set so as to satisfy the relationship of 2dsin θ ′ = λ ′ and 2dsin θ = λ. By doing so, the wavelength λ of the first reference light 12 and the wavelength λ ′ of the first reproduction illumination light 21 can be made different. For example, an Ar gas laser (wavelength 476.5 nm) is used as the reproduction wavelength, It is also possible to use a semiconductor laser (wavelength 440 nm).

  Next, an example of setting the wavelengths and angles of RGB light during full-color hologram recording and reproduction will be described. For example, an R Kr laser (wavelength 647.1 nm), a G DPSS laser (wavelength 532 nm), and a B Ar laser (wavelength 476.5 nm) are used as recording lasers, and an R semiconductor laser (reproducing laser) (wavelength 476.5 nm). A wavelength 640 nm), a G DPSS laser (wavelength 532 nm), and a B semiconductor laser (wavelength 440 nm) are used.

  FIG. 7 is a diagram for explaining a process during hologram reproduction when the R and B wavelengths are changed between recording and reproduction, and FIG. 8 is a diagram for changing the R and B wavelengths between recording and reproduction. It is a figure for demonstrating the process at the time of the hologram recording in a case.

  In the present embodiment, the wavelengths of R and B are changed between recording and reproduction, and as shown in FIG. 7, the reproduction angles of RGB at the reproduction wavelength λ ′ different from the recording wavelength λ are set to the same angle. The case will be described. In addition, although R is demonstrated here, it is the same also about B.

  At this time, as shown in FIG. 6, the angle between the interference fringes generated in the first hologram 1 ′ and the R reproduction illumination light 21R and the R reproduction light 22R is θ ′, and the interference fringe interval is d, Assuming that the reproduction wavelength of the reproduction light 22R of the reproduction illumination light 21R and the reproduction light 22R is λR ′, each parameter satisfies the relationship of 2dsin θ ′ = λR ′ and satisfies the Bragg reflection condition.

  In order to set the reproduction angles of RGB at the reproduction wavelength λ ′ different from the recording wavelength λ to the same angle as shown in FIG. 7, the angles at which RGB enter the first hologram recording photosensitive material 1 at the time of recording are set. change.

  At the time of recording, as shown in FIG. 8, since the wavelength of R is recorded as the recording wavelength λR, the incident angle of R is corrected by calculation, and the object beam 11R and the reference beam 12R are subjected to the first hologram recording photosensitive. Incident on material 1.

  At this time, as shown in FIG. 3, for example, the angle between the interference fringes generated in the first hologram recording photosensitive material 1 and the R object light 11R and the R reference light 12R is θ, and the interference fringe interval is d, where the recording wavelength of the object beam 11R and the reference beam 12R is λR, each parameter satisfies the relationship of 2dsinθ = λR and satisfies the Bragg reflection condition.

  Here, with respect to R, since the interference fringe d does not change between the design time and the recording time, λR / sinθ = λR ′ / sinθ ′, and θ can be obtained.

  At the time of recording, as shown in FIG. 8, the first angle is set so that the angle between the interference fringes generated in the first hologram recording photosensitive material 1 and the R object light 11R and the R reference light 12R becomes θ. Object light 11R and reference light 12R are incident on the hologram recording photosensitive material 1.

  As shown in FIG. 7, reproduction illumination lights 21R, 21G, and 21B having different wavelengths are identical to the first hologram 1 ′ recorded as shown in FIG. 8 from the same second surface 1′b as the reference lights 12R, 12G, and 12B. When incident at an angle, the reproduction lights 22R, 22G, and 22B are diffracted at the same angle from the second surface 1′b.

  Next, a hologram replication apparatus that replicates a full-color hologram when the wavelength is different between recording and reproduction will be described.

  FIG. 9 is a diagram illustrating the hologram duplicating apparatus according to the first embodiment.

  The light emitted from the RGB laser irradiators 101R, 101G, and 101B is reflected by the first reflecting surfaces 102R, 102G, and 102B, each of which is composed of a dichroic mirror, etc., and is synthesized into one optical path by the second reflecting surface 103. After being magnified by a light beam enlarging member 104 such as a Schal filter, the light is collimated by a parallel light converting member 105 such as a collimating lens and is incident on a holographic mirror 106 as an optical element.

  In the holographic mirror 106, the RGB light beams are reflected at a predetermined angle and are incident on the second hologram sensitive material 2 and the first hologram 1 '. The incident angles of RGB incident on the second hologram sensitive material 2 and the first hologram 1 'are the same as those of the first reproduction illumination light 21 of the first hologram 1'.

  As shown in FIG. 15, the R, G, and B light beams are incident on the first hologram 1 ′ as the first reproduction illumination light 21, and the first reproduction light 22 is diffracted to produce the second hologram recording as a duplication hologram sensitive material. The first reproduction light 22 is incident as the second object light 31 from the first surface 2a and the first reproduction illumination light 21 is incident as the second reference light 32 from the second surface 2b on the photosensitive material 2 for interference. . Thereafter, the second hologram recording photosensitive material 2 can be post-processed to produce a second hologram 2 'as a duplicate hologram.

  At the time of reproduction, as shown in FIG. 16, the second reproduction illumination light 41 for each of RGB that travels in the same direction as the second reference light 32 at the time of recording as shown in FIG. By making it enter from 2 surface 2'b, as shown in FIG. 15, the 2nd reproduction | regeneration light 42 of each RGB which advances in the same direction as the 2nd object light 31 at the time of recording is diffracted. Therefore, it is possible to produce a full-color duplicate hologram in which the recording wavelength and the reproduction wavelength are different.

  10 and 11 are diagrams showing examples of the holographic mirror 106. FIG.

  The holographic mirror 106 shown in FIG. 10 reflects light incident on the same optical path of RGB into different optical paths. The holographic mirror 106 shown in FIG. 11 reflects the light incident on the same optical path of RGB. The R holographic mirror 106R, the G holographic mirror 106G, and the B holographic mirror 106B are reflected on three different optical paths.

  FIG. 12 is a diagram showing the hologram duplicating apparatus according to the second embodiment, and FIG. 13 is an enlarged view of the dichroic mirror 107. The hologram duplication device of the second embodiment applies a dichroic mirror 107 as an optical element instead of the holographic mirror 106 of the hologram duplication device of the first embodiment.

  As shown in FIG. 13, the dichroic mirror 107 reflects light incident on RGB in the same optical path to three different optical paths by three dichroic mirrors 107 R, 107 G and 107 B for dichroic mirrors. It is.

  Note that the hologram duplication apparatus may use an optical element as shown in FIG. 14 as the third embodiment. The optical element used in the hologram duplication device of the third embodiment is a combination of both the holographic mirror 106 of the hologram duplication device of the first embodiment and the dichroic mirror 107 of the hologram duplication device of the second embodiment. .

  As shown in FIG. 14, the optical elements 106 and 107 reflect light incident on RGB in the same optical path to three different optical paths by two holographic mirrors 106RG for RG and dichroic mirror 107B for B, respectively.

  As described above, according to the present embodiment, in order from one side, the second hologram recording photosensitive material 2, the first hologram 1 ′ that reproduces at least one light beam of RGB at a reproduction wavelength different from that at the time of recording, In a hologram duplicating apparatus for producing a second hologram 2 ′ by laminating a back layer 3 that absorbs light having a wavelength around the recording wavelength of the first hologram 1 ′ and irradiating the first hologram 1 ′ with reproduction illumination light The laser irradiator 101 that irradiates each of the R, G, and B lasers, and the light irradiated by the laser irradiator 101 for each of the R, G, and B light beams is the same as the reference light at the time of recording the first hologram 1 ′. And an optical element 106 that emits toward the first hologram 1 'and the second hologram recording photosensitive material 2 by changing to an angle, so that the hologram is reproduced at a wavelength different from the recording wavelength. It can be made compact with a simple structure of the optical system for the ram replication. It should be noted that the second hologram recording photosensitive material 2 and the first hologram 1 'or the first hologram 1' and the back layer 3 may be laminated via an index matching liquid or the like.

  Further, since the optical element 106 includes the holographic mirror 106, it can be formed more compactly.

  Further, the holographic mirror 106 is composed of a single sheet and changes the angle of at least one of RGB, so that it can be formed more compactly.

  Further, the holographic mirror 106 is formed by stacking the R holographic mirror 106R for changing the angle of R, the G holographic mirror 106G for changing the angle of G, and the B holographic mirror 106B for changing the angle of B. Further, it can be formed with a simpler structure.

  Furthermore, the hologram duplication method of the present embodiment that achieves the above object comprises the steps of producing a first hologram 1 ′ that reproduces at least one luminous flux of RGB at a reproduction wavelength different from that during recording, and sequentially from one side. , A step of laminating the second hologram recording photosensitive material 2, the first hologram 1 ', and a back layer 3 that absorbs light having a wavelength around the recording wavelength, a step of irradiating RGB light flux, and a RGB light flux Is changed to the same angle as the reference light at the time of recording the first hologram 1 ′ by the optical element 106, and the light beam emitted from the optical element 106 is incident on the first hologram 1 ′ and the second hologram recording photosensitive material 2. And the step of replicating the hologram, so that the hologram to be reproduced at a wavelength different from the recording wavelength can be replicated by a simple method.

  Furthermore, since the hologram of the present embodiment that achieves the above object is produced by the hologram duplication method, it can be duplicated by a simple method.

DESCRIPTION OF SYMBOLS 1 ... 1st hologram recording photosensitive material 1 '... 1st hologram (hologram original)
2 ... Photosensitive material for second hologram recording (hologram sensitive material for duplication)
2 '... 2nd hologram (replicated hologram)
3 ... back layer 11 ... first object light 12 ... first reference light 21 ... first reproduction illumination light 22 ... first reproduction light 31 ... second object light 32 ... second reference light 41 ... second reproduction illumination light 42 ... Second reproducing light 101 ... Laser irradiator 102 ... first reflecting surface 103 ... second reflecting surface 104 ... light beam expanding member 105 ... parallel light converting member 106 ... holographic mirror (optical element)
107 ... Dichroic mirror (optical element)

Claims (6)

In order from one side, a hologram photosensitive material for duplication, a hologram master that reproduces at least one luminous flux of RGB at a reproduction wavelength different from that at the time of recording, a back layer that absorbs light having a wavelength around the recording wavelength of the hologram precursor, In the hologram duplicating apparatus for producing a duplicate hologram by irradiating each hologram light beam to the hologram master and the duplication hologram photosensitive material,
A laser irradiator for irradiating each of the R, G, and B lasers;
One parallel light beam, which is a combination of the R, G, and B light beams irradiated by the laser irradiator, is changed to the same angle as the reference light at the time of recording on the hologram master for each of the R, G, and B light beams. And an optical element that emits light toward the hologram master and the duplicate hologram photosensitive material,
A hologram duplicating apparatus comprising:   The hologram replication device according to claim 1, wherein the optical element is a holographic mirror.   3. The hologram duplicating apparatus according to claim 2, wherein the holographic mirror is composed of a single piece and changes an angle of at least one of RGB.   The holographic mirror is formed by stacking an R holographic mirror for changing an R angle, a G holographic mirror for changing an G angle, and a B holographic mirror for changing an B angle. Item 3. The hologram duplicating device according to Item 2. Producing a hologram master that reproduces at least one luminous flux of RGB at a reproduction wavelength different from that at the time of recording;
In order from the one side, the step of laminating a replica hologram sensitive material, the hologram original plate, and a back layer that absorbs light having a wavelength around the recording wavelength;
Irradiating one parallel luminous flux in which the luminous fluxes of RGB are combined ;
Changing each of the one parallel light beam to an RGB light beam having the same angle as the reference light at the time of recording the hologram master by an optical element;
A light beam emitted from the optical element is incident on the hologram original plate and the hologram photosensitive material for duplication, and a hologram is duplicated;
A hologram duplication method characterized by comprising:   A hologram duplicated by the hologram duplication method according to claim 5.

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