JP2010276660A - Method for duplicating hologram and hologram duplicated by the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for duplicating a hologram, the method bringing out the diffraction performance of an precursor and the modulation amount in the refractive index of a recording material as much as possible and duplicating a high-quality hologram; and to provide a hologram duplicated by the method. <P>SOLUTION: The method includes steps of: stacking, in the order from one side, a transmissive holographic polymer dispersion liquid crystal element 1' that diffracts only p-polarized light, a half-wave plate 3, and a hologram material 2 for duplication; irradiating the transmissive holographic polymer dispersion liquid crystal element 1' with p-polarized reproducing illumination light 23 through the one side; splitting the reproducing illumination light 23 into first-order light 25 and zero-order light 24 by the transmissive holographic polymer dispersion liquid crystal element 1'; converting the first-order light 25 and the zero-order light 24 from p-polarized light into s-polarized light by the half-wave plate 3; and using the first-order light 25 converted into s-polarized light as an object light 26 and the zero-order light 24 converted into s-polarized light as reference light 27 to be incident on the hologram material 2 for duplication, so as to duplicate a transmissive hologram 2'. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hologram replication method and a hologram replicated thereby, and more particularly to a hologram replication method using s-polarized light and a hologram replicated thereby.

  In a liquid crystal display device, a technique for switching between display and non-display of a liquid crystal screen by turning on and off a voltage applied to a transparent electrode formed in a display range is known. Recently, a holographic polymer-dispersed liquid crystal in which an interference pattern by a laser is recorded on a polymer dispersed liquid crystal (hereinafter referred to as “PDLC”) that can switch between light scattering and non-scattering states. With the development of holographic polymer dispersed liquid crystal (hereinafter abbreviated as “HPDLC”), it is possible to control the presence or absence of light diffraction by voltage drive.

  Usually, HPDLC is recorded using a liquid crystal cell in which an ITO transparent electrode is vapor-deposited on the inside and the gap is uniformly controlled, so that there is little variation in diffraction efficiency within the surface, and there is little contamination with foreign matter, etc. It is suitable as. In addition, since the material is liquid, mass transfer during the photochemical reaction is easy, and the adjustment of the refractive index modulation amount is easier than with coated silver salt materials and photopolymers. This is advantageous because the diffraction efficiency of the original can be easily controlled. As a method for mass-producing holograms, as in Non-Patent Document 1, a technique for closely exposing a hologram master and a photosensitive material is known.

JP 2000-212465 A

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

  As an HPDLC material, for example, a material such as that disclosed in Patent Document 1 is known, and the refractive index of the liquid crystal having the refractive index in the isotropic region (or the average refractive index of the entire material) and the refractive index anisotropy is known. When the hologram is configured by the difference, the produced HPDLC mainly diffracts p-polarized light (linearly polarized light, and the vibration plane of light is perpendicular to the interference fringes).

  However, it is preferable to use s-polarized light (linearly polarized light, whose light vibration plane is parallel to the interference fringes) for the exposure of the hologram. Compared with the case where s-polarized light is used, the contrast of the interference fringes is lowered, and the performance of the material cannot be sufficiently obtained.

  The present invention has been made in view of such problems of the prior art, and its purpose is to maximize the diffraction performance of the original and the refractive index modulation amount of the recording material, and to replicate a high-quality hologram. It is to provide a hologram duplication method and a hologram duplicated thereby.

  The hologram duplicating method of the present invention that achieves the above object comprises the steps of laminating a transmissive holographic polymer dispersed liquid crystal element that diffracts only p-polarized light, a half-wave plate, and a duplicating hologram material in order from one side. Irradiating the transmission type holographic polymer dispersed liquid crystal element from one side with p-polarized reproduction illumination light, and applying the reproduction illumination light to the transmission light holographic polymer dispersion liquid crystal element with primary light and zero order light. A step of converting the primary light and the zero-order light from p-polarized light to s-polarized light by the half-wave plate, and the primary light converted to the s-polarized light as object light, and the s And having the zero-order light converted into polarized light as reference light to be incident on the duplication hologram material and duplicating the transmission hologram.

  In addition, the hologram duplication method of the present invention that achieves the above object comprises laminating a reflective holographic polymer dispersed liquid crystal element that diffracts only p-polarized light, a half-wave plate, and a duplication hologram material in order from one side. Irradiating the replication hologram material with s-polarized reference light from the other side, converting the reference light from s-polarized light to p-polarized light with the half-wave plate, and being converted into the p-polarized light Diffracting the reproduction illumination light by the reflective holographic polymer dispersed liquid crystal element and reflecting it as primary light; converting the primary light from p-polarized light to s-polarized light by the half-wave plate; and s The primary light converted into polarized light is used as object light, is incident on the duplication hologram material, interferes with the s-polarized reference light, and duplicates the reflection hologram. And wherein the Rukoto.

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

  According to the present invention, HPCDLC can be reproduced with p-polarized light, and s-polarized light can be recorded with s-polarized light, and the diffraction efficiency of the original can be controlled. It is possible to provide a hologram production method for producing a high-quality duplicate hologram by maximizing the refractive index modulation of the recording material and a hologram produced thereby.

It is a figure which shows the liquid crystal cell of this embodiment. It is AA sectional drawing of FIG. It is a figure which shows the method of producing the transmissive HPDLC original plate of 1st Embodiment. It is a figure which shows the method of reproducing | regenerating the transmission type HPDLC original plate of 1st Embodiment. It is a figure which shows the method to duplicate the transmission hologram of 1st Embodiment. It is a figure which shows the method to reproduce | regenerate the duplicated transmission type hologram of 1st Embodiment. It is a figure which shows the method of producing the reflection type HPDLC original plate of 2nd Embodiment. It is a figure which shows the method of reproducing | regenerating the reflection type HPDLC original plate of 2nd Embodiment. It is a figure which shows the method to duplicate the reflection type hologram of 2nd Embodiment. It is a figure which shows the method of reproducing | regenerating the duplicated reflection type hologram of 2nd Embodiment.

  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 process of injecting a photosensitive liquid crystal material into a liquid crystal cell and sealing it in a liquid crystal cell for producing an HPDLC as an original plate will be described. FIG. 1 is a diagram showing a liquid crystal cell of the present embodiment, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

  As shown in FIG. 1, the liquid crystal cell 1 is patterned so that two glass substrates 11 (11a, 11b) are bonded by a sealing agent 12 and the periphery of the glass substrate 11 is surrounded by leaving a material injection port 12a. Yes.

  As shown in FIG. 2, a gap 14 for injecting a liquid crystal material is provided between two opposing glass substrates 11 (11a, 11b) on which ITO thin film transparent electrodes 13 (13a, 13b) are evaporated. In order to make the gap 14 uniform, glass beads 15 having the same particle diameter are dispersed. Here, a liquid crystal material sensitive to visible light is injected by a vacuum injection method, and a sealing agent is applied to the injection port and cured.

  Next, a process for recording an interference pattern by a laser in the liquid crystal cell 1 into which the material has been injected will be described.

  FIG. 3 is a diagram showing a method for producing a transmission HPDLC hologram master.

  The object light 21 and the reference light, which are coherent laser beams from different angles with respect to one glass surface, with respect to the glass cell 1 for liquid crystal containing a liquid crystal material sensitive to visible rays shown in FIGS. 22 is irradiated and an interference pattern is recorded.

  The hologram photosensitive material comprising the liquid crystal cell 1 is subjected to post-processing such as a non-coherent ultraviolet irradiation / heating step to become a transmission type HPDLC hologram 1 'as a transmission type holographic polymer dispersed liquid crystal element. In order to produce such a transmission type HPDLC hologram 1 ', it is preferable to use a nematic liquid crystal as the hologram sensitive material and a mixture of monomers and oligomers as the polymer material. Specifically, phenylglycidil ether acrylate hexamethylene diisocyanate urethane prepolymer, 2-hydroxyethyl methacrylate, dimethylol tricyclodecane diacrylate, and the like can be used.

  The laser and wavelength used for photographing are 514 nm of Ar laser. Therefore, N-Phenylglycine may be added as a photopolymerization initiator, and Dibromofluoresceine may be added as a dye for absorbing light having a laser wavelength near 515 nm.

  FIG. 4 is a diagram illustrating a process of reproducing the transmission type HPDLC hologram manufactured according to the first embodiment. In order to reproduce the transmission type HPDLC hologram 1 ′, when the p-polarized reproduction illumination light 23 is irradiated from an opposite direction to the reference light 22 at the time of photographing at an angle in the vicinity of the Bragg angle that the wavelength of the visible light that is the reproduction light satisfies, The secondary reproduction light 24 and the primary reproduction light 25 can be diffracted.

  Next, using the produced transmission HPDLC hologram 1 ′ as an original, p-polarized reproduction illumination light 23 is applied to the original of the transmission HPDLC hologram 1 ′, and the 0th-order light 24 and 1 diffracted as p-polarization by the original is obtained. The process of converting the next light 25 into s-polarized light and recording the duplication hologram material 2 will be described.

  FIG. 5 is a diagram illustrating a method of replicating the transmission hologram according to the first embodiment. As shown in FIG. 5, the transmission HPDLC hologram 1 ′, the original half-wave plate 3, and the duplication hologram material 2 are laminated in this order from the incident side of the reproduction illumination light 23. As the half-wave plate 3, a quartz wave plate made by Newport was used.

  Then, p-polarized reproduction illumination light 23 is incident on the original of the transmission type HPDLC hologram 1 ′ from the direction opposite to the reference light 22 at the time of photographing. The reproduction illumination light 23 incident as p-polarized light on the original of the transmission type HPDLC hologram 1 ′ is branched into the 0th order light 24 and the diffracted primary light 25 which are transmitted by the original of the transmission type HPDLC hologram 1 ′. Is converted from p-polarized light to s-polarized light and enters the hologram material 2 for duplication.

  That is, the primary light 25 converted into s-polarized light by the half-wave plate 3 enters the duplication hologram material 2 as object light 26, and the zero-order light 24 enters the duplication hologram material 2 as reference light 27. . Then, an interference pattern is recorded on the duplication hologram material 2 by the object beam 26 and the reference beam 27, and the transmission hologram 2 'is duplicated.

  FIG. 6 is a diagram illustrating a method for reproducing a duplicated transmission hologram according to the first embodiment. As shown in FIG. 6, when the reproduction illumination light 28 is incident on the transmission hologram 2 ′ from the direction opposite to the reference light 27, the reproduction light 29 is diffracted. The transmission hologram 2 'was of the same quality as a hologram produced by two-beam interference with s-polarized light.

  As described above, the hologram replication method of the first embodiment includes a step of laminating the transmission type HPDLC hologram 1 ′ that diffracts only p-polarized light, the half-wave plate 3, and the replication hologram material 2 in order from one side. Irradiating the transmissive HPDLC hologram 1 ′ with p-polarized reproduction illumination light 23 from one side, and branching the reproduction illumination light 23 into primary light 25 and zero-order light 24 by the transmission HPDLC hologram 1 ′. The step of converting the primary light 25 and the zero-order light 24 from the p-polarized light to the s-polarized light by the half-wave plate 3, the primary light 25 converted to the s-polarized light as the object light 26, and the 0 converted to the s-polarized light And the step of making the next light 24 incident on the duplication hologram material 2 as the reference beam 27 and duplicating the transmission hologram 2 ′, so that the HPDLC is suitable for the original plate. High-quality transmission type that can be performed with p-polarized light, can be recorded with s-polarized light for duplication, can control the diffraction efficiency of the original, maximize the refractive index modulation of the hologram recording material The hologram 2 ′ can be duplicated.

  Next, a method for producing the reflective HPDLC original plate according to the second embodiment will be described. FIG. 7 is a view showing a method for producing a reflective HPDLC original plate according to the second embodiment.

  A liquid crystal cell 4 containing a liquid crystal material sensitive to visible rays shown in FIGS. 1 and 2 is irradiated with an object beam 31 which is a coherent laser beam with respect to one glass surface, and from the other glass surface. The reference beam 32 is irradiated from different angles, and the interference pattern is recorded.

  The hologram photosensitive material comprising the liquid crystal cell 4 is subjected to post-processing such as a non-coherent ultraviolet irradiation / heating process to become a reflective HPDLC hologram 4 '. In order to produce such a reflection type HPDLC hologram 4 ', light having a refractive index of n3 or thermosetting polymer material (for example, thermosetting polymer material: epoxy resin (n3 = 1.5), or photocurable type) Polymer material: polymer material composed of light rack LA0208 (n3 = 1.5)) and twisted nematic liquid crystal whose refractive index can be changed from n1 to n2 (n1> n2 ≧ n3) by an electric field (for example, E-manufactured by Merck) 7: n1 = 1.75, n2 = 1.52).

  The laser and wavelength used for photographing are 514 nm of Ar laser. Therefore, N-Phenylglycine may be added as a photopolymerization initiator, and Dibromofluoresceine may be added as a dye for absorbing light having a laser wavelength near 515 nm.

  FIG. 8 is a diagram showing a process of reproducing the reflection type HPDLC hologram produced in the second embodiment. In order to reproduce the reflective HPDLC hologram 4 ', reproduction is performed by irradiating the p-polarized reproduction illumination light 33 from the direction opposite to the reference light 32 at the time of photographing at an angle near the Bragg angle that the wavelength of the visible light that is the reproduction light satisfies. The light 34 can be diffracted.

  Next, using the produced reflective HPDLC hologram 4 ′ as an original, p-polarized reproduction illumination light 33 is applied to the original of the reflective HPDLC hologram 4 ′, and the reproduced light 34 diffracted as p-polarized by the original is s-polarized. A process for recording the duplication hologram material 5 will be described.

  FIG. 9 is a diagram illustrating a method of replicating the reflection hologram according to the second embodiment. As shown in FIG. 9, the original of the reflective HPDLC hologram 4 ′, the half-wave plate 3, and the replication hologram material 5 are laminated in this order toward the incident side of the reproduction illumination light 33. As the half-wave plate 3, a quartz wave plate made by Newport was used.

  Then, s-polarized reference light 35 is incident on the duplication hologram material 5 from the direction opposite to the reference light 32 at the time of photographing the reflective HPDLC hologram 4 ′. The reference light 35 incident on the duplication hologram material 5 as s-polarized light is converted from s-polarized light to p-polarized light by the half-wave plate 3 and is incident on the original of the reflective HPDLC hologram 4 ′ as reproduction illumination light 33. The reproduction illumination light 33 is diffracted by the original of the reflective HPDLC hologram 4 ′ and reflected as reproduction light 34 that is the primary light. The reproduction light 34 is converted from p-polarized light to s-polarized light by the half-wave plate 3 and enters the duplication hologram material 5.

  That is, the reproduction light 34 converted to s-polarized light by the half-wave plate 3 enters the duplication hologram material 5 as object light 36 and interferes with the reference light 35. Then, an interference pattern is recorded on the duplication hologram material 5 by the object beam 36 and the reference beam 35, and the reflection hologram 5 'is duplicated.

  FIG. 10 is a diagram illustrating a method for reproducing a duplicated reflection hologram according to the second embodiment. As shown in FIG. 10, when the reproduction illumination light 37 is incident on the reflection hologram 5 ′ from the opposite direction to the reference light 35, the reproduction light 38 is diffracted. The reflection hologram 5 'was of the same quality as a hologram produced by two-beam interference with s-polarized light.

  As described above, the hologram duplication method of the second embodiment includes a step of laminating the reflective HPDLC hologram 4 ′ that diffracts only p-polarized light, the half-wave plate 3, and the duplication hologram material 5 in order from one side. Irradiating the hologram material for replication 5 from the other side with s-polarized reference light 35, converting the reference light 35 from s-polarized light to p-polarized light by the half-wave plate 3, and reproducing illumination converted into p-polarized light The step of diffracting the light 33 by the reflective HPDLC hologram 4 ′ and reflecting it as the primary light 34, the step of converting the primary light 34 from the p-polarized light to the s-polarized light by the half-wave plate 3, and the s-polarized light The primary light 34 is made into object light 36, is incident on the duplication hologram material 5, and interferes with the s-polarized reference light 35 to duplicate the reflection hologram 5 ′. For HPDLC, HPCDLC can be reproduced with p-polarized light, and recording onto the hologram material for duplication can be performed with s-polarized light. The diffraction efficiency of the original plate can be controlled, and the refractive index modulation of the hologram recording material can be maximized. The high-quality reflection hologram 5 ′ can be duplicated.

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal cell 1 '... Transmission type HPDLC hologram (Transmission type holographic polymer dispersion liquid crystal element)
2 ... Holographic material for duplication 2 '... Transmission type duplication hologram 3 ... Half wave plate 4 ... Liquid crystal cell 4' ... Reflection type HPDLC hologram (reflection type holographic polymer dispersed liquid crystal element)
5 ... Reproduction hologram material 5 '... Reflective replication hologram 11 ... Glass substrate 12 ... ITO thin film transparent electrode 13 ... First reference light 14 ... Gap 15 ... Glass beads 21 ... Object light 22 ... Reference light 23 ... Reproduction illumination light 24 ... 0th order light (reproducing light)
25 ... Primary light (reproducing light)
26 ... Object light 27 ... Reference light 28 ... Reproduction illumination light 29 ... Reproduction light 31 ... Object light 32 ... Reference light 33 ... Reproduction illumination light 34 ... Primary light (reproduction light)
35 ... Reference light 36 ... Object light 37 ... Reproduction illumination light 38 ... Reproduction light

Claims (3)

Laminating a transmissive holographic polymer dispersed liquid crystal element that diffracts only p-polarized light, a half-wave plate, and a replication hologram material, in order from one side;
Irradiating the transmission type holographic polymer dispersed liquid crystal element from one side with p-polarized reproduction illumination light;
Branching the reproduction illumination light into primary light and zero-order light by the transmissive holographic polymer dispersed liquid crystal element;
Converting the primary light and the zero-order light from p-polarized light to s-polarized light by the half-wave plate;
The primary light converted into the s-polarized light is used as object light, and the zero-order light converted into the s-polarized light is used as reference light to enter the replication hologram material, and a transmission hologram is replicated;
A hologram duplication method characterized by comprising: Laminating a reflective holographic polymer dispersed liquid crystal element that diffracts only p-polarized light, a half-wave plate, and a hologram material for duplication in order from one side;
Irradiating the replication hologram material from the other side with s-polarized reference light;
Converting the reference light from s-polarized light to p-polarized light by the half-wave plate;
Diffracting the reproduction illumination light converted into p-polarized light by the reflective holographic polymer dispersed liquid crystal element and reflecting it as primary light;
Converting the primary light from p-polarized light to s-polarized light by the half-wave plate;
Making the primary light converted into s-polarized light into object light, entering the hologram material for replication, causing interference with the s-polarized reference light, and replicating a reflection hologram;
A hologram duplication method characterized by comprising:   A hologram duplicated by the hologram duplication method according to claim 1.

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