WO2006011304A1 - 光情報記録媒体およびその記録方法と製造方法 - Google Patents
光情報記録媒体およびその記録方法と製造方法 Download PDFInfo
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- WO2006011304A1 WO2006011304A1 PCT/JP2005/010337 JP2005010337W WO2006011304A1 WO 2006011304 A1 WO2006011304 A1 WO 2006011304A1 JP 2005010337 W JP2005010337 W JP 2005010337W WO 2006011304 A1 WO2006011304 A1 WO 2006011304A1
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- WIPO (PCT)
- Prior art keywords
- recording medium
- optical information
- information recording
- layer
- dlc layer
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 16
- 230000001678 irradiating effect Effects 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 239000000758 substrate Substances 0.000 claims description 23
- 238000000149 argon plasma sintering Methods 0.000 claims description 18
- 230000000737 periodic effect Effects 0.000 claims description 11
- 238000010894 electron beam technology Methods 0.000 claims description 10
- 238000010884 ion-beam technique Methods 0.000 claims description 10
- 238000005253 cladding Methods 0.000 claims description 7
- 238000005268 plasma chemical vapour deposition Methods 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 229910003460 diamond Inorganic materials 0.000 claims description 2
- 239000010432 diamond Substances 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims 1
- 238000010030 laminating Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 74
- 239000011521 glass Substances 0.000 description 14
- 239000011347 resin Substances 0.000 description 12
- 229920005989 resin Polymers 0.000 description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 10
- 229910052804 chromium Inorganic materials 0.000 description 10
- 239000011651 chromium Substances 0.000 description 10
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 9
- 239000004926 polymethyl methacrylate Substances 0.000 description 9
- 239000012792 core layer Substances 0.000 description 7
- 238000005530 etching Methods 0.000 description 5
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 4
- 230000005469 synchrotron radiation Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 206010034960 Photophobia Diseases 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000003848 UV Light-Curing Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 208000013469 light sensitivity Diseases 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000307 polymer substrate Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
- G11B7/24044—Recording layers for storing optical interference patterns, e.g. holograms; for storing data in three dimensions, e.g. volume storage
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
-
- 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
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0402—Recording geometries or arrangements
- G03H1/0408—Total internal reflection [TIR] holograms, e.g. edge lit or substrate mode holograms
-
- 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
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/18—Particular processing of hologram record carriers, e.g. for obtaining blazed holograms
- G03H1/182—Post-exposure processing, e.g. latensification
-
- 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
- G03H2001/026—Recording materials or recording processes
- G03H2001/0268—Inorganic recording material, e.g. photorefractive crystal [PRC]
-
- 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
- G03H2001/2605—Arrangement of the sub-holograms, e.g. partial overlapping
- G03H2001/261—Arrangement of the sub-holograms, e.g. partial overlapping in optical contact
- G03H2001/2615—Arrangement of the sub-holograms, e.g. partial overlapping in optical contact in physical contact, i.e. layered holograms
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2240/00—Hologram nature or properties
- G03H2240/50—Parameters or numerical values associated with holography, e.g. peel strength
- G03H2240/54—Refractive index
Definitions
- the present invention relates to an optical information recording medium, and more particularly to an optical information recording medium capable of easily recording at high density and having excellent durability.
- Non-Patent Document l OPTRONICS, (2 001), No. 11, pp. 149-154.
- the pit depth is set to 4 types including 0, the reflectivity of the reproduction light beam varies depending on the pit depth, so it is shown in the schematic graph of FIG.
- four types of reflectivity can be obtained from multiple pits arranged in the scanning direction of the reproduction light beam. That is, one pit can represent any value of 0, 1, 2, and 3. This is equivalent to recording 2 bits of information in one pit.
- Non-Patent Document 2 O plus
- a hologram memory can record three-dimensional information in a three-dimensional recording medium.
- a large number of two-dimensional data pages can be recorded in an overlapping manner.
- the two-dimensional data can be recorded and reproduced in units of one page.
- FIGS. 5 and 6 illustrate an example of a method for recording information on a hologram recording medium and an example of a method for reproducing the recorded information, respectively.
- a material for such a hologram recording medium iron-doped lithium niobate (Fe: LiNbO) or a photopolymer whose refractive index can be increased by light irradiation is used! RU
- object light 33 including information of two-dimensional digital data 32 is projected onto a hologram recording medium 31 through a lens 34.
- the reference beam 35 having a predetermined angle with respect to the object beam 33 is projected on the hologram recording medium 31.
- the hologram force formed by the interference between the object light 33 projected on the hologram recording medium 31 and the reference light 35 is recorded as a change in the refractive index in the hologram recording medium 31. That is, one page of digital data 32 can be recorded in the hologram recording medium 31 at a time.
- a hologram recording medium 31 data of different pages can be recorded in an overlapping manner by changing the irradiation angle or wavelength of the reference light 35. Then, by using the reference light having the same conditions as the reference light used for the recording as the readout light, the recording data of each page can be reproduced individually.
- the hologram memory as described above can also record and reproduce two-dimensional images such as figures and photographs as page data.
- Japanese Patent Laid-Open No. 11-345419 of Patent Document 1 and OPTRON of Non-Patent Document 3 ICS, (2001), No. 11, pp. 143-148 discloses a laminated waveguide hologram memory having a structure in which single mode planar waveguides are laminated.
- FIG. 7 illustrates an example of the laminated waveguide hologram memory disclosed in Patent Document 1 with a schematic cross-sectional view.
- This laminated waveguide hologram memory is composed of a plurality of core layers 12-1, 12-2,..., 12 sandwiched between a plurality of clad layers 1 to 11, 11-2,. -n-1 is included. Then, each lamination unit of the clad layer, the Z core layer, and the Z clad layer acts as a planar single mode waveguide with respect to the wavelength of the laser beam 13 used.
- One page of 2D data can be recorded in one planar waveguide.
- the end face of the planar waveguide into which the laser beam 13 is introduced through the lens 14 is a reflecting surface 15 having an angle of 45 degrees with respect to the waveguide plane.
- the reproduction laser beam 13 is reflected by the (cylindrical) lens 14 on the reflection line 18 of the specific planar waveguide (see FIG. 7).
- the guided light 16 introduced into the planar waveguide from the reflection line 18 propagates in a plane in the waveguide and is partially scattered by the light scattering element (hologram) 19.
- the light scattering element has periodicity, there is a direction in which the phases of the scattered light of each light scattering element force coincide with each other, and the direction becomes diffracted light 17 and travels out of the planar waveguide.
- a hologram image 20 is formed.
- the hologram image 20 can be read by capturing the hologram image 20 with a CCD or the like. At this time, since the hologram image 20 appears as diffracted light 17 having a specific angle with respect to the waveguide surface, it can be projected onto the CCD without the need for a projection lens.
- the focal position of the laser beam 13 is adjusted by the lens 14 to change the planar waveguide through which the light propagates, and the page information recorded in each planar waveguide can be read out individually.
- the pattern of the light scattering element 19 corresponding to the desired information can be obtained by a computer (see Non-Patent Document 3).
- FIG. 8 is a schematic cross-sectional view illustrating an example of a method for manufacturing a laminated waveguide hologram memory as shown in FIG.
- an ultraviolet ray curable resin layer 22 is spin-coated on a glass substrate 21 to a thickness of, for example, 8 m, and is cured by irradiation with ultraviolet rays 23.
- This UV-cured resin layer 22 is to act as a cladding layer.
- a PMMA (polymethyl methacrylate) layer 24 is, for example, 1.
- a roller 25 having a line-shaped uneven pattern is run at a period of 0.46 m, and the uneven pattern is transferred to the PMMA layer 24.
- This PMMA layer 24 serves as a core layer. Further, the uneven pattern formed on the surface of the core layer acts as a periodic light scattering element, and the pattern is obtained in advance by a computer corresponding to the information to be recorded.
- Patent Document 1 Japanese Patent Laid-Open No. 345419
- Non-patent literature l OPTRONICS, (2001), No. 11, pp. 149-154
- Non-Patent Document 2 0 plus E, Vol. 25, No. 4, 2003, pp. 385-390
- Non-Patent Document 3 OPTRONICS, (2001), No. 11, pp. 143-148
- the lithium niobate hologram memory has low light sensitivity and a narrow recording dynamic range.
- the hologram memory of lithium niobate is expensive and has a low lifetime due to reproduction deterioration in which the recording disappears by repeated reading.
- the photopolymer has a problem of volume shrinkage before and after recording. That is, if the recording material expands or contracts, the pitch of the diffraction grating in the hologram changes and the diffraction conditions change, so that reading cannot be performed using the reference light at the time of recording.
- Photopolymers also have recordings where the refractive index change ⁇ due to light irradiation is as small as 0.04 or less. The dynamic range cannot be increased.
- the laminated waveguide hologram memory described above uses a PMMA core layer and an ultraviolet curable resin cladding layer.
- the light scattering element is made of an ultraviolet curable resin that fills the fine recesses on the surface of the PMMA core layer. That is, light scattering is caused by the refractive index difference ⁇ between PMMA and the UV curable resin.
- the refractive index of PMMA is 1.492
- the refractive index of UV-cured resin is 1.480. That is, the refractive index difference ⁇ between PMMA and the UV curable resin is only 0.012.
- Such a small refractive index difference ⁇ cannot be said to be sufficiently large to form a light scattering element.
- the UV-cured resin layer is also subject to deterioration due to changes over time.
- the main object of the present invention is to provide an optical information recording medium that can be easily recorded at high information density and has excellent durability. Is to provide in the strike.
- An optical information recording medium includes a diamond 'like' carbon (DLC) layer deposited on a substrate, and recording of information on the optical information recording medium includes a plurality of recording spots. It is characterized in that it can be performed by irradiating an energy beam to a selected recording spot area of the area and increasing the refractive index of the DLC layer in the recording spot area.
- DLC diamond 'like' carbon
- the DLC layer in any selected recording spot region can be increased to any value set in a plurality of refractive index steps by irradiation with an energy beam.
- an energy beam is applied to the DLC layer through a metal film mask pattern including an opening corresponding to a recording spot region whose refractive index is to be increased.
- the refractive index of the DLC layer in the recording spot area should be increased by irradiating with any of ultraviolet rays, X-rays, ion beams, and electron beams.
- ultraviolet rays, X-rays, ion beams, energy beams as energy beams are passed to the DLC layer through an additional metal film mask pattern including openings corresponding to the recording spot regions selected from the recording spot regions having an increased refractive index.
- the refractive index of the DLC layer in those selected recording spot areas by irradiating either This step may be repeated one or more times.
- a method for recording information on an optical information recording medium through an energy beam absorption mask whose thickness is locally changed in multiple steps corresponding to a recording spot area. Irradiating the DLC layer with an ultraviolet ray, an X-ray, an ion beam, or an electron beam as an energy beam to increase the refractive index of the DLC layer in the recording spot region, and the energy beam absorbing layer
- the spot region may be locally thinned as the refractive index level of the spot region increases.
- An optical information recording medium includes a DLC layer formed on a substrate, and recording of information on the optical information recording medium is performed as object light including information to be recorded. It is characterized in that it can be stored as a refractive index modulation structure formed in the DLC layer by a hologram generated by irradiating the DLC layer with ultraviolet rays and ultraviolet rays as reference light.
- a laminated waveguide type holographic optical information recording medium in which a plurality of cladding layers and a plurality of DLC layers are alternately laminated, and each DLC layer includes Different information is recorded and periodic light scattering elements corresponding to the recorded information are generated, and each of the periodic light scattering elements is a minute region with an increased refractive index.
- a DLC layer is deposited on a light-transmitting substrate acting as a cladding layer, and (b) corresponds to a periodic light scattering element.
- the DLC layer is irradiated with any of ultraviolet rays, X-rays, ion beams, and electron beams as energy beams through the metal film mask pattern including the apertures to increase the refractive index of the DLC layer in those aperture regions.
- C a plurality of pairs of the clad layer and the DLC layer that have undergone the above steps (a) and (b), and (d) the DLC exposed as the uppermost layer.
- the method includes a step of overlaying a cladding layer on the layer.
- the DLC layer in the optical information recording medium as described above can be preferably deposited by plasma CVD.
- the invention's effect [0029] According to the present invention, a large refractive index change can be obtained by irradiating an energy beam of a DLC layer having excellent durability. Therefore, a DLC recording layer that can be easily recorded at high information density and has excellent durability. Can be provided at low cost.
- FIG. 1 is a schematic cross-sectional view illustrating a method for producing an optical information recording medium according to an embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view illustrating a method for producing an optical information recording medium according to another embodiment of the present invention.
- FIG. 3 is a schematic cross-sectional view illustrating a method for manufacturing an optical information recording medium according to still another embodiment of the present invention.
- FIG. 4 is a schematic graph showing the difference in reflectance from a plurality of pits having different depths in a multi-value optical disk.
- FIG. 5 is a schematic perspective view illustrating the operation of writing data to the hologram recording medium.
- FIG. 6 is a schematic perspective view illustrating the operation of reading the hologram recording medium force data.
- FIG. 7 is a schematic cross-sectional view illustrating an example of a laminated waveguide hologram memory.
- FIG. 8 is a schematic cross-sectional view illustrating an example of a method for producing the laminated waveguide hologram memory of FIG.
- the present inventors have confirmed that the refractive index can be increased by irradiating the light transmissive DLC film with an energy beam.
- DLC films can be formed by plasma CVD (chemical vapor deposition) on silicon substrates, glass substrates, polymer substrates, and other various substrates.
- a translucent DLC film obtained by such plasma CVD usually has a refractive index of about 1.55.
- SR light generally includes electromagnetic waves in a wide wavelength range from ultraviolet light to X-rays.
- the refractive index can be similarly modulated by implanting ions such as H, Li, B, and C.
- the refractive index can be similarly modulated by irradiation with excimer laser light such as ArF (193 nm), XeCl (308 nm), XeF (351 nm), or Ar laser light (488 nm).
- excimer laser light such as ArF (193 nm), XeCl (308 nm), XeF (351 nm), or Ar laser light (488 nm).
- the schematic cross-sectional view of FIG. 1 illustrates a method of manufacturing an optical information recording medium and information recording according to Embodiment 1 of the present invention.
- the DLC layer 2 is deposited on the glass substrate 1 by a known plasma CVD to a thickness of 1 ⁇ m, for example.
- a chromium film is deposited on the glass substrate 3 by vapor deposition, for example, and a metal film mask pattern 4 is produced by patterning the chromium film by stepper exposure and etching.
- This metal film mask pattern 4 includes a plurality of minute openings corresponding to a plurality of recording spot regions.
- the produced metal film mask pattern 4 is overlaid on the DLC layer 2.
- a bin area is formed and binary recording is performed.
- the reproduction light beam is irradiated onto the optical information recording medium, the amount of light reflected or transmitted through the recording spot area changes depending on the refractive indexes n and n.
- Embodiment 2 multilevel recording is performed on an optical information recording medium including a DLC layer.
- binary recording is performed as in the case of the first embodiment illustrated in FIG.
- the second metal film mask pattern 4 a is overlaid on the DLC layer 2.
- This second metal film mask pattern 4a corresponds to the recording spot area selected by the recording spot area force whose refractive index is increased to n in FIG.
- the DLC layer 4 is again irradiated with ultraviolet rays 5 through the second metal film mask pattern 4a.
- Multi-value recording will be performed.
- multi-value recording can be performed by repeating ultraviolet irradiation using a further metal film mask pattern.
- FIG. 3 illustrates a method of manufacturing an optical information recording medium and information recording according to Embodiment 3 of the present invention.
- the plasma is formed on the glass substrate 1.
- DLC layer 2 is deposited by means of CVD.
- a chromium film is deposited on the DLC layer 2, and a metal film mask pattern 4b in which the chromium film is patterned by stepper exposure and etching is produced.
- stepper exposure and etching are performed in a plurality of stages, and in the example of FIG. 3, the metal film mask pattern 4b includes a thickness of 0 in a plurality of minute areas corresponding to a plurality of recording spot areas. It has been changed in three stages. Then, the ultraviolet ray 5 is irradiated to the DLC layer 4 through the metal film mask pattern 4b.
- the ultraviolet ray 5 is the thickest of the metal film mask pattern 4b, and the region cannot be transmitted! /, But thin areas can be partially transparent.
- ultraviolet light having a wavelength of 250 nm can partially penetrate a chromium film having a thickness of about 60 nm or less.
- the metal film mask pattern 4b functions as an energy beam absorbing layer that absorbs the energy beam in accordance with the thickness changed stepwise for each minute region corresponding to the recording spot region. Therefore, by irradiating the DLC layer 4 with ultraviolet rays 5 through the metal film mask pattern 4b, a recording spot region force whose refractive index is changed in three steps is formed in the SDLC layer 2, and thus 3 Value recording will be performed.
- two-dimensional digital data is hologram-recorded on the DLC recording layer in the same manner as described with reference to FIGS. That is, the DLC layer force of about 1 ⁇ m thickness deposited on the glass substrate by plasma CVD is used as the hologram recording medium 31 in FIG.
- a chromium film force stepper exposure and etching deposited on a glass substrate are processed into a metal film mask pattern representing two-dimensional digital data, and this metal film mask pattern is used as the two-dimensional digital data 32 in FIG.
- ultraviolet light having a wavelength of 250 nm and an energy density of 20 mWZmm 2 is used as the object light 33 that passes through the two-dimensional digital data 32 of the chromium film.
- This object light is applied to the hologram recording medium 31 of the DLC lens 34. Projected by.
- ultraviolet light as reference light 35 is also applied to the DLC hologram recording medium 31, and a hologram resulting from the interference between the object light 33 and the reference light 35 is recorded as a change in refractive index in the DLC recording medium 31.
- Embodiment 5 a laminated waveguide hologram memory is produced.
- a DLC layer 2 force such as a thickness lOOnm is deposited on a glass substrate 1 having a thickness of 100 m, for example, by a well-known plasma CVD.
- a chromium film is deposited on the glass substrate 3, and a metal film mask pattern 4 is produced by patterning the chromium film by stepper exposure and etching.
- This metal film mask pattern 4 corresponds to one page of data, and has a plurality of periodic minute apertures corresponding to periodic light scattering elements (holograms) 19 as shown in FIG. Contains.
- a DLC recording layer that can be easily recorded at high information density and has excellent durability. Can be provided at low cost.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/658,584 US20090010135A1 (en) | 2004-07-28 | 2005-06-06 | Optical Information Recording Medium, and Recording Method and Manufacturing Method Thereof |
EP05751137A EP1783566A1 (en) | 2004-07-28 | 2005-06-06 | Optical information recording medium, and recording method and manufacturing method thereof |
KR1020077002073A KR20070035049A (ko) | 2004-07-28 | 2005-06-06 | 광 정보 기록 매체 및 그 기록 방법과 제조 방법 |
CA002574378A CA2574378A1 (en) | 2004-07-28 | 2005-06-06 | Optical information recording medium, and recording method and manufacturing method thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004220435A JP2006039303A (ja) | 2004-07-28 | 2004-07-28 | 光情報記録媒体およびその記録方法と製造方法 |
JP2004-220435 | 2004-07-28 |
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WO2006011304A1 true WO2006011304A1 (ja) | 2006-02-02 |
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PCT/JP2005/010337 WO2006011304A1 (ja) | 2004-07-28 | 2005-06-06 | 光情報記録媒体およびその記録方法と製造方法 |
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US (1) | US20090010135A1 (ja) |
EP (1) | EP1783566A1 (ja) |
JP (1) | JP2006039303A (ja) |
KR (1) | KR20070035049A (ja) |
CN (1) | CN1989462A (ja) |
CA (1) | CA2574378A1 (ja) |
TW (1) | TW200606927A (ja) |
WO (1) | WO2006011304A1 (ja) |
Cited By (1)
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JP2007317249A (ja) * | 2006-05-23 | 2007-12-06 | Omron Corp | 光メモリ及びその製造方法、光メモリ媒体並びに情報読み取り装置 |
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- 2005-06-06 EP EP05751137A patent/EP1783566A1/en not_active Withdrawn
- 2005-06-06 WO PCT/JP2005/010337 patent/WO2006011304A1/ja active Application Filing
- 2005-06-06 CN CNA200580025412XA patent/CN1989462A/zh active Pending
- 2005-06-06 CA CA002574378A patent/CA2574378A1/en not_active Abandoned
- 2005-06-06 US US11/658,584 patent/US20090010135A1/en not_active Abandoned
- 2005-06-06 KR KR1020077002073A patent/KR20070035049A/ko not_active Application Discontinuation
- 2005-07-11 TW TW094123381A patent/TW200606927A/zh unknown
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Also Published As
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KR20070035049A (ko) | 2007-03-29 |
JP2006039303A (ja) | 2006-02-09 |
TW200606927A (en) | 2006-02-16 |
EP1783566A1 (en) | 2007-05-09 |
CA2574378A1 (en) | 2006-02-02 |
US20090010135A1 (en) | 2009-01-08 |
CN1989462A (zh) | 2007-06-27 |
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