WO2004086106A1 - 透明再帰反射材 - Google Patents
透明再帰反射材 Download PDFInfo
- Publication number
- WO2004086106A1 WO2004086106A1 PCT/JP2004/004309 JP2004004309W WO2004086106A1 WO 2004086106 A1 WO2004086106 A1 WO 2004086106A1 JP 2004004309 W JP2004004309 W JP 2004004309W WO 2004086106 A1 WO2004086106 A1 WO 2004086106A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- transparent
- retroreflective material
- reflective layer
- retroreflective
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims abstract description 81
- 238000002834 transmittance Methods 0.000 claims abstract description 11
- 229910010272 inorganic material Inorganic materials 0.000 claims abstract description 4
- 239000011147 inorganic material Substances 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 99
- 239000004005 microsphere Substances 0.000 claims description 19
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 11
- 239000012790 adhesive layer Substances 0.000 claims description 7
- 239000004408 titanium dioxide Substances 0.000 claims description 5
- -1 aluminum tin oxide Chemical compound 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 abstract 2
- 239000010419 fine particle Substances 0.000 abstract 1
- 239000011241 protective layer Substances 0.000 description 13
- 229920005989 resin Polymers 0.000 description 10
- 239000011347 resin Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000011521 glass Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000011324 bead Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000003431 cross linking reagent Substances 0.000 description 4
- 238000007733 ion plating Methods 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920006289 polycarbonate film Polymers 0.000 description 2
- 239000013464 silicone adhesive Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000005284 excitation 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
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/12—Reflex reflectors
- G02B5/126—Reflex reflectors including curved refracting surface
- G02B5/128—Reflex reflectors including curved refracting surface transparent spheres being embedded in matrix
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/12—Reflex reflectors
- G02B5/122—Reflex reflectors cube corner, trihedral or triple reflector type
- G02B5/124—Reflex reflectors cube corner, trihedral or triple reflector type plural reflecting elements forming part of a unitary plate or sheet
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/12—Reflex reflectors
- G02B5/136—Reflex reflectors plural reflecting elements forming part of a unitary body
Definitions
- the present invention relates to retroreflective materials, and in particular to improvements in their reflective layers. [Background technology]
- retroreflective materials are used for traffic signs or clothes for night identification, and when beam-like light such as a headlight of an automobile is irradiated, return light can be sent out almost in the incident direction. it can.
- a relatively high refractive index microsphere is used to form a light reflecting layer such as a metal film.
- a metal film particularly aluminum, is used for the reflective layer because of its high refraction efficiency due to its high reflectance.
- retroreflective materials When viewed with ordinary light such as under sunlight, these retroreflective materials have the appearance of the retroreflective materials themselves, and the externally reflected light can be observed under linear beam light.
- a retroreflective material can be affixed to a branded product, a card, or the like, so that it can be distinguished from a counterfeit product.
- the present invention has been made in view of the above situation, and an object of the present invention is to provide a transparent retroreflective material capable of visually recognizing information even when pasted on a surface on which information is described. is there.
- the transparent retroreflective material of the present invention is a retroreflective material provided with a retroreflective portion for returning incident light substantially in the traveling direction of incident light, and the retroreflective portion has a refractive index of 2.
- the reflective layer is made of titanium dioxide or indium tin oxide.
- retroreflective material it is preferable to draw information that can be observed as retroreflected light by partially disposing the reflective layer.
- the above-described retroreflective material it is preferable that information that can be observed as retroreflected light be drawn by providing a portion having a different layer thickness and / or refractive index of the reflective layer in the reflective layer.
- the above-mentioned retroreflective material preferably includes a hologram layer or a diffraction pattern recording layer.
- FIG. 1 is a schematic configuration diagram of the transparent retroreflective material of the present invention.
- FIG. 2 is an explanatory diagram when the transparent retroreflective material is placed under normal light (FIG. 2 (a)) and linear light (FIG. 2 (b)).
- FIG. 3 is an explanatory diagram of coloring of retroreflected light.
- FIG. 4 is an explanatory diagram when a transparent retroreflective material is attached to a surface on which information is printed and observed from above.
- FIG. 5 is a schematic configuration diagram of another embodiment of the transparent retroreflective material of the present invention.
- the conventional retroreflective material has not been considered for use such that it is attached to a surface on which information is written and the information is visually recognized.
- the retroreflective material is to be stuck on a passport, a certificate such as a license, a photo or text printed on a card, etc. for the purpose of preventing forgery, etc. It must be able to recognize characters.
- a transparent retroreflective material that can read the information even if it is pasted on the surface on which the information is described is required.
- the performance of recursive reflection must not be impaired.
- the present inventors have conducted intensive studies, and as a result, by using a highly transparent inorganic material having a high refractive index for the reflective layer, it is possible to obtain high transparency while having sufficient performance as a retroreflective material. There was found. Further, by adjusting the thickness of the reflective layer, the retroreflected light can be colored.
- the transparent retroreflective material will be described in detail below with reference to embodiments.
- the normal light refers to light having a variation in existing wavelengths, such as sunlight or illumination light such as a fluorescent lamp, and a variation in the traveling direction of the light.
- Linear light refers to light whose traveling direction is aligned.
- the wavelength may vary.
- the transparent retroreflective material 10 of the embodiment of FIG. 1 is configured by laminating a protective layer 22, a retroreflective portion 12, and an adhesive layer 24.
- the retroreflective section 12 includes a reflective layer 14 and a number of transparent microspheres 16 arranged on the reflective layer 14.
- the reflection layer 14 is made of an inorganic substance having a refractive index of 2.0 or more, for example, a metal oxide.
- a focusing resin layer 18 for focusing is provided on the reflective layer 14, and the transparent microspheres 16 are arranged in a form embedded in the focusing resin layer 18.
- the reflective layer 14 is disposed so that the position of the reflective layer 14 is near the focal position of the transparent microsphere 16.
- the transparent microsphere 16 acts as a spherical lens, and the position of the reflection layer 14 is set as the focal position, and the light reflected by the reflection layer 14 is returned in the incident direction.
- a microsphere fixing layer 20 is provided on the aligned transparent microspheres 16, and a protective layer 22 is further laminated thereon.
- the protective layer 22 is provided for the purpose of supporting other layers and protecting the retroreflective material 10.
- the protective layer 22 is made of a highly transparent material.
- the transparent retroreflective material 10 thus configured has a light transmittance in the wavelength range of 450 to 700 nm of 30 to 99%, more preferably 50 to 99%. It is.
- the adhesive layer 24 allows the retroreflective material 10 to be attached to an article 26 such as a product, card, or certificate.
- the surface of the article 26 is an information recording surface 28 on which information such as photographs, figures, symbols, characters, and pictures is described. As described above, when pasted on the information recording surface 28, the information cannot be visually recognized with the conventional retroreflective material.
- FIG. 2 (a) is an explanatory diagram when the retroreflective material 10 is observed under normal light.
- a part of the light incident on the retroreflective material 10 becomes retroreflected light that returns in substantially the same direction as the incident direction by the action of the transparent microspheres, the focal resin layer, and the reflective layer, as in the conventional case.
- the light transmittance of the reflective layer is sufficiently high, a part of the incident light passes through the reflective layer as it is to the article 26 and is reflected on the surface of the article 26. With this reflected light, information described on the surface of the article 26 can be observed.
- under normal light light is incident from various directions, so retroreflected light itself can hardly be recognized.
- the retroreflective material of the present invention is observed under normal light, its appearance is observed as a transparent film.
- FIG. 2 (b) is an explanatory diagram in the case where the retroreflective material 10 is observed under linear light.
- part of the incident light is reflected by the reflective layer to become retroreflected light, and the rest passes through the reflective layer to reach the article 26, where it is reflected. .
- the incident direction of light is uniform, so that retroreflected light is often observed. Become. Further, information written on the article 26 can be visually recognized by light reflected on the surface of the article 26. In other words, under linear light, retroreflected light can be observed in addition to the information written on the article by observing from the incident direction of the light.
- FIG. 3 is an explanatory view of this, and shows a part of FIG. 1 in an enlarged manner.
- part of the light that has entered the reflective layer 14 is reflected light A that is reflected on the surface of the reflective layer 14, and the rest enters the reflective layer 14 and is reflected on the back surface of the reflective layer 14.
- Reflected light B is Interference occurs due to the optical path difference between the reflected light A and the reflected light B.
- light of a certain wavelength is weakened, and light of a certain wavelength is strengthened.
- retroreflected light of a different color from the incident linear light is observed.
- the color of the retroreflected light is adjusted by adjusting the thickness of the reflective layer in consideration of the refractive index, the phase change at the time of reflection, and the like.
- Table 1 shows the relationship between the color of retroreflective light and the layer thickness of the reflective layer when titanium dioxide is used for the reflective layer and white light is incident.
- the reflective layer is made of an inorganic material having a high light transmittance and a large refractive index
- the present invention provides high reflectivity, high transparency and sufficient retroreflection.
- the thickness of the reflective layer it is possible to adjust the color of the retroreflected light by the interference color. Wear.
- Fig. 4 shows a top view of a state in which such a retroreflective material is attached to an article.
- information such as characters and photographs can be printed on a part of the film, or can be combined with a hologram layer or a diffraction pattern recording layer.
- Figure 5 shows examples of these. 1 are added to portions corresponding to those in FIG.
- the printing information 130 is added to the surface of the protective layer 122.
- the print information 130 is obtained by printing information such as photographs, characters, symbols, and figures on a part of the protective layer 122.
- the printed surface is shown on the protective layer 1 2 2, but printing information is sandwiched between the reflective layer 1 14 and the focal resin layer 1 18 or the back surface of the protective layer 1 2 2 (The side on which the retroreflective section 112 is laminated)
- the print information may be sandwiched between the protective layer 122 and the retroreflective section 112. Even if a part with low light transmittance is provided in this way, it is not printed, and the part has sufficient transparency, so it is printed on the article from the unprinted part, part Information can be read.
- FIG. 5 (b) shows a hologram layer 13 2 laminated on the retroreflective section 1 12 I have.
- the hologram layer 13 2 is formed using a hologram reproducing body on which hologram interference fringes are recorded.
- a conventionally known hologram film may be used as the hologram layer 13 2.
- a material with high light transmittance to some extent, so a translucent hologram reconstructor or transparent hologram reconstructor is used.
- a hologram image emerges on the retroreflective material, and the effect of design and decoration is enhanced. If a hologram regenerating body that can reproduce a hologram image only with a laser beam of a specific wavelength is used as the hologram layer, forgery prevention effect can be improved.
- a hologram layer shown in FIG. 5 (b) is replaced by a diffraction pattern recording layer 134 in which a diffraction grating pattern is recorded using the same technique as that of the hologram.
- the retroreflective material can have a pearlescent appearance.
- the above-mentioned respective layers may be combined and constituted.
- the protective layer 22 has the purpose of supporting the other layers to be laminated and protecting the surface of the retroreflective material.
- the protective layer 22 is required to have resistance to the manufacturing process, quality stability, coating aptitude, workability, and the like.
- it is necessary to use a material with high transparency.
- a material having strength, heat resistance, and heat conductivity that can achieve these objects, for example, polyethylene terephthalate, polyester, polypropylene, polycarbonate, polytetrafluoroethylene, and the like are selected.
- a film having another function such as a hologram or a film having a light diffraction pattern may be used.
- the resin used for the microsphere fixing layer 20 is selected to have good adhesion to the transparent microspheres and high transparency. Examples include acrylic adhesives, urethane adhesives, and silicone adhesives. Further, a crosslinking agent may be added in order to increase the coating strength and the bonding strength with the transparent microspheres. ⁇ Transparent microsphere>
- the transparent microsphere 16 may be a conventionally known one.
- the particle size of 30 ⁇ 80 ⁇ ; 8 & 0-3 10 2 - Ding 1 Omicron 2 based glass, B aO_ZnO- T i 0 2 based glass or the like may be used, its refractive index is 1.9 to 2.
- the refractive index is 1.9 to 2.
- a conventionally known material may be used for the focal resin layer 18.
- high transparency is required.
- acrylic resins, urethane resins, silicone resins and the like can be mentioned.
- a cross-linking agent may be added to increase the film strength.
- a compound having high transparency and high refractive index is used for the reflective layer 14.
- examples include titanium oxide, indium tin oxide, zinc oxide, and tungsten oxide.
- Examples of the method for forming the reflective layer include a vacuum deposition method, an ion plating method, and a sol-gel method. Of these, the ion plating method is superior in terms of adhesion and uniformity of film thickness. Further, although it cannot be said unconditionally based on the material of the substance to be used, the thickness of the reflective layer is preferably 500 to 3000 A in order to obtain a sufficient light transmittance.
- a material having high transparency is also used for the adhesive layer 24.
- examples include acrylic adhesives, urethane adhesives, and silicone adhesives.
- Examples of the form of bonding include bonding with an adhesive, and hot melt bonding by heating.
- Table 2 shows the manufacturing conditions of Examples 1, 2, and 3.
- Table 2 Example 1
- Example 2 Example 3 ultimate vacuum 2. 0 X 10 one 5
- 2. 0 X 10-5 2. 0 X 1 0 ⁇ 5 substrate temperature (° c) 110 24 29
- Ar gas (Torr) 1. 4 X 10-4 2. 0 X 10- 4 2. 0 X 10 one 4 Film Speed (A / s) 2. 1 1. 3 2. 7
- a transparent polycarbonate film having a thickness of 100 ⁇ was used as a protective layer, and titanium dioxide was used as a reflective layer.
- Glass beads having a refractive index of 1.9 were used for the transparent microspheres, and a mixture of a urethane resin and a crosslinking agent was used for the transparent microsphere fixing layer and the focal resin layer.
- the manufacturing method is as follows. A mixture of a urethane-based resin and a cross-linking agent is applied to a transparent polycarbonate film, and glass beads having a refractive index of 1.9 are sprayed before the resin is completely cured. Then, the glass beads were heat-treated at 70 ° C for 3 minutes to fix the glass beads. Next, urethane resin for focusing was applied and dried at 80 ° C for 10 minutes. Further, by using the ion plating method by a high-frequency excitation method (RF method), it was deposited with T i 0 2 in glass beads fixed surface side of the film subjected to the processing. In the ion plating, using T i 0 2 as the evaporation material, it was used an electron gun (EB) as the evaporation source.
- RF method high-frequency excitation method
- the film was formed for 4 minutes with the film forming speed of the reflective layer being 2.1 A / s, and a transparent retroreflective material having a film thickness of the reflective layer of 500 A was obtained.
- Other manufacturing conditions are shown in Table 2.
- Example 2 As a result of visually observing the retroreflective material obtained in Example 1, it was confirmed that the material had sufficient transparency. In addition, in order to examine the retroreflection performance, white linear light was used as the incident linear light, and observation was performed visually from the incident light direction. As a result, gold retroreflection was observed, and it was confirmed that sufficient retroreflection performance was obtained and colored retroreflection was obtained.
- Example 2 In order to examine the retroreflection performance, white linear light was used as the incident linear light, and observation was performed visually from the incident light direction. As a result, gold retroreflection was observed, and it was confirmed that sufficient retroreflection performance was obtained and colored retroreflection was obtained.
- Example 2 had a thickness of the reflective layer of 120 OA.
- the film formation speed of the reflective layer was 1.3 A / s, and the film was formed for 16 minutes. Table 2 shows other manufacturing conditions.
- Example 3 As a result of visually observing the retroreflective material obtained in Example 2, it was confirmed that the material had sufficient transparency. In addition, in order to examine the retroreflection performance, white linear light was used as the incident linear light, and observation was performed visually from the incident light direction. As a result, retroreflected light was observed, confirming that it had sufficient retroreflective performance and that colored retroreflection was obtained.
- Example 3 In order to examine the retroreflection performance, white linear light was used as the incident linear light, and observation was performed visually from the incident light direction. As a result, retroreflected light was observed, confirming that it had sufficient retroreflective performance and that colored retroreflection was obtained.
- Example 3 was that in which the thickness of the reflective layer was 230 OA.
- the film formation speed of the reflective layer was 2.7 A / s, and the film was formed for 14 minutes. Table 2 shows other manufacturing conditions.
- the transparent retroreflective material of the present invention by providing a reflective layer composed of an inorganic substance having a refractive index of 2.0 or more, and transparent microspheres arranged on the reflective layer, sufficient retroreflection is provided. It is possible to obtain a transparent retroreflective material having a reflectance and a light transmittance of 30 to 99% in a wavelength range of 450 to 700 nm.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
- Laminated Bodies (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-85462 | 2003-03-26 | ||
JP2003085462A JP2004294668A (ja) | 2003-03-26 | 2003-03-26 | 透明再帰反射材 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004086106A1 true WO2004086106A1 (ja) | 2004-10-07 |
Family
ID=33095026
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/004309 WO2004086106A1 (ja) | 2003-03-26 | 2004-03-26 | 透明再帰反射材 |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP2004294668A (ja) |
KR (1) | KR20050110622A (ja) |
TW (1) | TW200502588A (ja) |
WO (1) | WO2004086106A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4468902B2 (ja) | 2006-01-17 | 2010-05-26 | 株式会社資生堂 | 情報を記録した積層材料、それを貼付した物品、および情報読み取り方法 |
WO2008156138A1 (ja) * | 2007-06-19 | 2008-12-24 | Marujin Co., Ltd. | 虹色反射光を持つ再帰性反射材 |
JP2011002491A (ja) * | 2009-06-16 | 2011-01-06 | Toppan Printing Co Ltd | 表示体及びラベル付き物品 |
US20120099200A1 (en) * | 2009-07-17 | 2012-04-26 | Nippon Carbide Industries Co., Inc. | Retroreflective sheeting of micro glass sphere provided with image having visual direction |
WO2017099116A1 (ja) | 2015-12-07 | 2017-06-15 | 国立大学法人宇都宮大学 | 表示装置及び空中像の表示方法 |
JP6927554B2 (ja) * | 2015-12-07 | 2021-09-01 | 国立大学法人宇都宮大学 | 表示装置 |
KR20180093324A (ko) * | 2017-02-13 | 2018-08-22 | 이병우 | 전시용 디스플레이 시스템 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50129195A (ja) * | 1974-03-27 | 1975-10-13 | ||
JPS60232503A (ja) * | 1983-03-08 | 1985-11-19 | Toppan Printing Co Ltd | シルクスクリ−ン・マスクによる再帰反射材の蒸着方法 |
JPH0131513Y2 (ja) * | 1982-11-16 | 1989-09-27 | ||
JPH06507737A (ja) * | 1991-05-08 | 1994-09-01 | ミネソタ マイニング アンド マニュファクチャリング カンパニー | 二重レベル検証を有する再帰性反射セキュリティラミネート |
JP2000081831A (ja) * | 1998-07-03 | 2000-03-21 | Shiseido Co Ltd | 再帰反射ホログラム再生体 |
-
2003
- 2003-03-26 JP JP2003085462A patent/JP2004294668A/ja active Pending
-
2004
- 2004-03-26 KR KR1020057013946A patent/KR20050110622A/ko not_active Withdrawn
- 2004-03-26 TW TW093108266A patent/TW200502588A/zh unknown
- 2004-03-26 WO PCT/JP2004/004309 patent/WO2004086106A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50129195A (ja) * | 1974-03-27 | 1975-10-13 | ||
JPH0131513Y2 (ja) * | 1982-11-16 | 1989-09-27 | ||
JPS60232503A (ja) * | 1983-03-08 | 1985-11-19 | Toppan Printing Co Ltd | シルクスクリ−ン・マスクによる再帰反射材の蒸着方法 |
JPH06507737A (ja) * | 1991-05-08 | 1994-09-01 | ミネソタ マイニング アンド マニュファクチャリング カンパニー | 二重レベル検証を有する再帰性反射セキュリティラミネート |
JP2000081831A (ja) * | 1998-07-03 | 2000-03-21 | Shiseido Co Ltd | 再帰反射ホログラム再生体 |
Also Published As
Publication number | Publication date |
---|---|
JP2004294668A (ja) | 2004-10-21 |
KR20050110622A (ko) | 2005-11-23 |
TW200502588A (en) | 2005-01-16 |
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