Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
  • G03H1/0252—Laminate comprising a hologram layer
  • G03H1/0256—Laminate comprising a hologram layer having specific functional layer
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
  • G03H2001/2625—Nature of the sub-holograms
  • G03H2001/263—Made of different recording materials
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2250/00—Laminate comprising a hologram layer
  • G03H2250/34—Colour layer
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2250/00—Laminate comprising a hologram layer
  • G03H2250/37—Enclosing the photosensitive material
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2250/00—Laminate comprising a hologram layer
  • G03H2250/39—Protective layer
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2260/00—Recording materials or recording processes
  • G03H2260/12—Photopolymer
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2260/00—Recording materials or recording processes
  • G03H2260/30—Details of photosensitive recording material not otherwise provided for

Definitions

• the present invention relates to a holographic recording medium for irradiating an object beam and a reference beam to record information by interference fringes.
• recording materials used for the recording layer of the holographic recording medium as described above include a rewritable material such as a photorefractive material and a write-once type material such as a photopolymer. is there.
• the present invention is to improve the trade-off between V and holographic recording in which the recording sensitivity and the shelf life are compatible, and to improve the shelf life for a recording medium having excellent recording sensitivity. It is a problem to be solved.
• the present inventor has found that the above trade-off can be improved by selectively blocking light in the photosensitive wavelength range with a film or the like having wavelength selectivity.
• a holographic recording medium that includes a recording layer, and irradiates the recording layer with object light and reference light having the same recording wavelength to record information by interference fringes. Is covered with a photosensitive protective layer, and the recording layer is set so that the sensitivity of the material to incident light falls from a short wavelength side to a long wavelength side near the recording wavelength.
• a holographic recording medium comprising a recording layer, and irradiating the recording layer with object light and reference light having the same recording wavelength to record information by interference fringes. Is covered with a photosensitive protective layer, and the recording layer is set so that the sensitivity of the material to incident light falls from a short wavelength side to a long wavelength side near the recording wavelength. Absorbs or reflects light in at least a short wavelength region of a longer wavelength region and a shorter wavelength region than a certain wavelength band around the recording wavelength, and selectively emits light in the certain wavelength band.
• a holographic recording medium characterized by being set to be transparent.
• the photosensitive protection layer covers two substrates sandwiching the recording layer, an outer peripheral end surface of the recording layer between the two substrates, and an outer peripheral end surface of the two substrates.
• the photosensitive protective layer is composed of two substrates sandwiching the recording layer, an end face seal covering the outer peripheral end surface of the recording layer between the two substrates.
• the recording layer is sandwiched between two substrates, and the photosensitive protective layer is configured to cover the recording layer and the two substrates (1) or (2).
• the photosensitive protective layer has an adhesive function when attaching the recording layer to the substrate, and includes a material having a wavelength longer than a certain wavelength band centered on the recording wavelength.
• the two substrates absorb or absorb at least light in a short wavelength region of a longer wavelength region and a shorter wavelength region than a certain wavelength band around the recording wavelength in the optical glass material.
• (3) or (4) comprising an optical glass plate formed by separating a light absorbing material that reflects and selectively transmits light in the certain wavelength band.
• FIG. 1 is a perspective view showing a holographic recording medium according to a first embodiment of the present invention in a partially sectional view.
• FIG. 2 is a graph showing the relationship between the sensitivity of the recording layer and the transmittance of the photosensitive protective layer in Example 1 in relation to the recording / reproducing wavelength.
• FIG. 3 is a graph showing the transmittance of a sharp cut filter used as a photosensitive protective layer in Example 1 as a function of wavelength.
• FIG. 4 is a diagram showing the transmittance of a photosensitive protective layer and the sensitivity of a recording layer in Example 2 as a function of the recording / reproducing wavelength.
• FIG. 5 is a perspective view showing a holographic recording medium according to Example 3 as a partial cross section.
• FIG. 6 is a perspective view showing a holographic recording medium according to Example 4 as a partial cross section.
• FIG. 7 is a perspective view showing a holographic recording medium according to Example 5 as a partial cross-sectional view.
• Figure 8 Diagram showing the relationship between the light transmittance and the conversion sensitivity of specific photosensitive materials used for the recording layer as a function of wavelength
• FIG. 9 is a graph showing the absorbance of a specific polymerization initiator used in the photosensitive protective layer in relation to the wavelength.
• the holographic recording medium has a recording layer covered with a photosensitive protective layer, and the recording layer has a sensitivity corresponding to a recording wavelength of a material having a short wavelength side near the recording wavelength.
• the photosensitive protective layer is set so as to sharply rise to the long wavelength side, and the light-sensitive protective layer is set so that the light transmittance corresponding to the recording wavelength sharply falls from the long wavelength side to the short wavelength side near the recording wavelength.
• the recording layer is sandwiched between two substrates, and the photosensitive protective layer is configured to cover the recording layer together with the two substrates, thereby achieving the above object.
• the holographic recording medium 10 includes a recording layer 12, two substrates 14 and 16 sandwiching the recording layer 12, and a photosensitive layer covering the entire outer peripheral surfaces of the substrates 14 and 16 sandwiching the recording layer 12.
• the protective layer 18 is provided.
• the holographic recording medium 10 irradiates the recording layer 12 with object light and reference light having the same wavelength at the same time, and records information using the interference fringes.
• the material of the recording layer 12 has a sensitivity to incident light that falls sharply from a short wavelength side to a long wavelength side near the recording (reproducing) wavelength ⁇ w, as shown by a symbol A in FIG. It is set as follows.
• the photosensitive protective layer 18 is set so that the light transmittance for incident light falls sharply toward the longer wavelength side and shorter wavelength side near the recording wavelength w.
• a specific material of the recording layer 12 is a material that generates microscopic refractive index modulation by being exposed to a beam having a recording wavelength ⁇ w, and is usually a photopolymer.
• the photopolymer contains a photopolymerizable monomer, a photopolymerization initiator, and a binder as main components, and may contain a thermal polymerization inhibitor and a visible light sensitizing dye as needed. It is preferable that the photosensitive protective layer 18 does not transmit light in a wavelength region shorter and longer than the recording wavelength ⁇ w. Don't let it happen! / That is, it may transmit light on the long wavelength side.
• a sharp cut filter (or a color filter) whose optical characteristics are shown in FIG. 3 is used.
• SCF-52Y, SCF-50Y, SCF-48Y, and SCF-44 ° manufactured by Sigma Koki are used.
• This sharp cut filter is for dispersing a light absorbing substance in the optical glass and transmitting only light on a longer wavelength side than a specific wavelength, and sets the recording wavelength w as the specific wavelength. .
• the recording layer 12 is covered with the photosensitive protective layer 18, and the light transmittance of the photosensitive protective layer 18 is shorter than the recording / reproducing wavelength w. Since environmental light of a wavelength is blocked, and the sensitivity of the recording layer 12 is insensitive to light having a wavelength longer than the recording / reproducing wavelength w, environmental exposure of the recording layer 12 can be suppressed.
• light having a wavelength w during recording or reproduction can pass through the photosensitive protective layer 18, which does not hinder recording and reproduction.
• the photosensitive protective layer 18 in this example has the optical characteristics indicated by the symbol B in Fig. 4 and transmits only light in a certain wavelength band centered on the recording (reproducing) wavelength ⁇ w. It is set to do so.
• the photosensitive protection layer 18 can protect the recording layer 12 and the exposure power of environmental light without hindering recording and reproduction.
• the photosensitive protective layer 18 is provided so as to cover the entire recording layer 12 and the two substrates 14 and 16 sandwiching the recording layer 12.
• the present invention is not limited to this, and may have a configuration as shown in Embodiment 3-5.
• two substrates 22 and 24 sandwiching the recording layer 12 also serve as a photosensitive protective layer.
• the two substrates 22 and 24 apply, to the optical glass material, light in at least a short wavelength region of a longer wavelength region and a shorter wavelength region than a certain wavelength band centered on the recording wavelength ⁇ w. It is composed of an optical glass plate formed by dispersing a light absorbing material that absorbs and selectively transmits light in the predetermined wavelength band.
• the substrates 22 and 24 have a size protruding from the outer peripheral end surface of the recording layer 12 with respect to the recording layer 12, and the gap between them is filled with an end surface seal 26, and the end surface seal 26 and the substrates 22 and 24 The and constitute a photosensitive protective layer.
• the end face seal 26 does not transmit a recording beam (a beam having a recording wavelength of ⁇ w), so that the same material as the photosensitive protective layer 18 or a material that blocks all light is used. Is also good.
• the substrates 32 and 34 sandwiching the recording layer 12 have the same size as the recording layer 12, and the recording layer 12 is sandwiched.
• the outer peripheral side surfaces (four surfaces) of the substrates 32 and 34 and the recording layer 12 are covered with an end face seal 36.
• the substrates 32 and 34 and the end face seal 36 are made of the same materials as the substrates 22 and 24 and the end face seal 26 of the third embodiment shown in FIG.
• an end seal 46 having an adhesive function is provided in the holographic recording medium 40 of the fifth embodiment. It was used as an adhesive when the recording layer 12 was attached to the substrates 22 and 24.
• a light absorbing material similar to the above is dispersed in a resin having an adhesive function, so that the material has a function of protecting the photosensitive material even after curing (adhesion).
• a light absorbing material may be used without transmitting light in a wide spectral region including the wavelength ⁇ w of the recording beam!
• FIG. 8 shows a film thickness 1.5% containing IRGACURE784 manufactured by Chinoku Specialty Chemicals Co., Ltd. The light transmittance and conversion sensitivity when a 00 mm photosensitive material is used as the recording layer are shown.
• a photosensitive material containing about 1.5% of IRGACURE784 as a polymerization initiator (see FIG. 8) It is preferred to use.
• SCF-52Y (A in Fig. 3) or SCF-50Y (B in Fig. 3) is used as the photosensitive protective layer, light at a wavelength shorter than 532 nm can be efficiently blocked, and A reduction in shelf life due to exposure can be suppressed.
• FIG. 9 shows the absorbance of a polymerization initiator containing 0.1%, 0.010%, and 0.001% (indicated by A, B, and C) of IRGACURE784 similar to the above in relation to wavelength. Show.
• a holographic recording medium having a high function can be provided while achieving both recording sensitivity and shelf life.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Holo Graphy (AREA)

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Citations (2)

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• 2004
  • 2004-01-07 JP JP2004001957A patent/JP2005195862A/ja active Pending
  • 2004-12-20 WO PCT/JP2004/019042 patent/WO2005066721A1/ja not_active Ceased
  • 2004-12-20 CN CNB2004800400329A patent/CN100547500C/zh not_active Expired - Fee Related
  • 2004-12-20 US US10/584,130 patent/US7304774B2/en not_active Expired - Fee Related

Patent Citations (2)

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