JP3315731B2 - Hybrid molded hologram and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type hologram, wherein the reflection layer is constituted by, for example, a combination of a transparent or translucent reflection layer and a reflection layer having metallic luster. The present invention relates to a hybrid hologram having a partially different reflective layer and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view schematically showing an example of a conventional hologram. The conventional hologram 30 is made of PE
A hologram forming layer 32 is formed on a base material layer 31 such as T. The hologram forming layer 32 is formed of a resin layer 3 on which a relief surface 33a of a hologram image is embossed.
3 and a reflection layer 34 formed on the relief surface 33a of the resin layer 33 to increase the hologram effect.

The reflective layer 34 is a layer in which a metal such as Al (aluminum) is deposited in the case of a silver type, and a metal compound such as ZnS or TiO ₂ is deposited in the case of a transparent type. An adhesive layer 36 for adhering to the adherend 20 is formed on the back side of the reflective layer 34.

[0004]

The hologram 30
Has been evaluated as the most effective as a forgery prevention means formed on a credit card or the like due to the high level of manufacturing technology and the high cost of manufacturing equipment. However, in recent years, holograms used in credit cards and the like have been counterfeited, and the counterfeiting prevention effect has been gradually diminishing. In addition, as holograms become more widespread, novelty in design is being lost, and new designs are also required. An object of the present invention is to solve the above-mentioned problems and provide a novel hybrid hologram having a high anti-counterfeiting effect and a method of manufacturing the same.

[0005]

In order to solve the above-mentioned problems, a first solution of the hybrid hologram according to the present invention is to provide a resin layer on which a hologram image is recorded so as to be capable of reproducing white light, and a resin layer formed of the resin layer. in the hologram comprising a reflective layer formed on the back surface, the reflective layer is formed on the back surface of the resin layer, and a transparent thin film layer having a reflective transparency, the translucent
It has a second reflection layer formed partially on the back surface of the bright thin film layer .

A second solution is that the transparent thin film layer and the second reflection layer are made of substantially the same material. Further, in a third solution, the transparency is provided.
The bright thin film layer is a transparent or translucent layer , and the second reflective layer is a metallic glossy reflective layer.

On the other hand, a first method for producing a hybrid hologram according to the present invention is the method for producing a hybrid hologram according to any one of the first to third means, wherein the hologram image is white. a step of forming the transparent thin film layer on one side of the resin layer is optically reproducible recording, comprising the steps of superimposing a desired pattern shape of the mask on one side of said transparent thin film layer, and the mask on one side of said transparent thin film layer Forming the second reflective layer only on the non-overlapping portion by vapor deposition.

A second method for producing a hybrid hologram according to the present invention is the method for producing a hybrid hologram according to the first or third means, wherein the hologram image is white light. Forming the transparent thin film layer on one side of the resin layer to be reproducibly recorded;
A step of forming the second reflective layer on one side of the transparent thin film layer , a step of forming a mask layer in a desired pattern on one side of the second reflective layer, and a portion where the mask layer is not formed Removing the second reflective layer.

Further, a third method for manufacturing a hybrid hologram according to the present invention is the method for manufacturing a hybrid hologram according to any one of the first to third means, wherein a hologram image is formed. a step of forming the transparent thin film layer on one side of the white light reproducibly recorded the resin layer, forming a mask layer in a desired pattern shape on one side of said transparent thin film layer, the transparent thin film layer and the mask Forming a second reflective layer on one side of the layer; and removing the second reflective layer in a portion where the mask layer is formed.

In the first to third manufacturing methods, the second reflective layer is formed directly on the resin layer, or after forming the transparent thin film layer on the resin layer, or further on the transparent thin film layer . The method may further include a step of forming a relief surface of the hologram image later.

[0011]

According to the present invention, since the transparent thin film layer and the second reflective layer coexist, the production is difficult and the anti-counterfeiting effect is improved. In addition, a desired pattern or the like can be expressed by the reflection layer itself, and a hologram image can be reproduced, so that the degree of freedom of design is improved and a novel pattern can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings and the like. FIG. 1 is a sectional view schematically showing an embodiment of a hybrid hologram according to the present invention, and FIG.
FIG. 3 is a process diagram showing a first embodiment of the method for producing a hybrid hologram according to the present invention. As shown in FIG. 1, the hybrid hologram 10 of this embodiment includes a base layer 11, a hologram forming layer 12, and an adhesive layer 16,
The layers are stacked in this order.

The base material layer 11 is for protecting the hologram forming layer 12 from damage due to external force and for imparting strength, and is not necessary for a transfer foil. As a material of the base material layer 11, a cellulose-based resin, a polyimide-based resin,
A simple substance, a mixture, a copolymer, or the like of a polystyrene resin, a polyester resin, a polyolefin resin, or the like can be used. The thickness of the base material layer 11 is 5 to 200 μm.
m is preferable. It should be noted that the base layer 11 can also serve as the resin layer 13 as described later.

The hologram forming layer 12 is obtained by recording a two-dimensional or three-dimensional image reproducible with white light as a hologram image, for example, by a relief hologram method.
Examples of the imaging method include an image hologram, a rainbow hologram, a multiplex hologram, a computer-aided hologram, and a partially formed holographic grating. Here, the computer-aided hologram refers to a hologram in which a plurality of computer graphics are photographed, instead of photographing an actual object at the time of photographing, and a three-dimensional image is displayed using parallax. Also, the hologram image need not necessarily be recorded by a holographic method, but may be a relief or hologram image obtained by recording by photolithography such as electron beam direct drawing on a photosensitive material such as a photoresist. A partially formed diffraction grating can also be used. Normally, embossed copies of the relief shapes of these recordings are used. The hologram image referred to in this embodiment includes a diffraction pattern formed by the above-described diffraction grating.

The hologram forming layer 12 is formed of a resin layer 13 having a hologram image relief surface 13a formed on the lower surface.
Formed on the relief surface 13a of the resin layer 13 ,
First reflective layer 14 which is a transparent thin film layer having a translucency
And a second reflection layer 15 partially formed on the lower surface of the first reflection layer 14. For example, the second reflective layer 15 may be arranged in a stripe pattern alternately with the first reflective layer 14 as shown in FIG. 2A, or as shown in FIG. One reflective layer 14 may be surrounded in a frame shape.

As a material of the resin layer 13, a thermoplastic resin, a thermosetting resin, or a mixture thereof can be used. In addition, a moldable substance having a radically polymerizable unsaturated group and being cured by heat or light or other radiation can be used. The resin layer 13 is formed on the base material layer 11 by a coating method or the like. If the base material layer 11 can be embossed, such as polyester, polyvinyl chloride, or polycarbonate, the resin layer 13 itself is formed. A hologram image may be formed by a relief hologram or the like, in which case the resin layer 12 is not required.

The first reflective layer 14 needs to have reflective transparency, and may be a transparent material having a different refractive index from the resin layer 13 or a metal thin film layer having a thickness of less than 200 mm. In the former case, the refractive index of the first reflective layer 14 may be larger or smaller than the refractive index of the resin layer 13,
The difference in refractive index is preferably 0.1 or more, more preferably 0.5 or more, and more preferably 1.0 or more. In the latter case, although it is a metal thin film, since the thickness is less than 200 mm, the transmittance of light waves is large,
For this reason, together with the hologram effect manifestation effect, the lower second reflective layer 15 exhibits a non-concealment effect.

The material of the first reflective layer 14 is, for example, a transparent continuous thin film having a higher refractive index than that of the resin layer 13.
Sb ₂ S ₃ (3.0), ZnS (2.1), TiO
₂ (2.3). In order to form the first reflective layer 14 on the resin layer 12, a thin film forming method such as a vacuum evaporation method and a sputtering method may be used.

When a material having metallic luster is used as the second reflective layer 15, for example, Cr, Ti, Fe,
Co, Ni, Cu, Ag, Au, Ge, Al, Mg, S
b, Pb, Pd, Cd, Bi, Sn, Se, In, G
a, Rb and other metals and their oxides, nitrides, etc., alone or in combination of two or more, by vapor deposition, sputtering, ion plating, electrolytic plating, electroless plating, or the like;
Is formed on the reflective layer 14. In the above metals, Al, C
r, Ni, Ag, Au or the like is particularly preferably used, and its film thickness is 10 to 10,000 °, and more preferably 200 to 2,000 °.
0 ° is desirable.

As described above, the first reflective layer 14 and the second reflective layer 15 are made of a material having a transparent reflectivity, and the second reflective layer 15 is made of a metallic luster. When the material has the following, the contrast between the portion where only the first reflective layer 14 is formed and the portion where the first reflective layer 14 and the second reflective layer 15 are formed becomes clear,
A desired picture or the like can be held in the reflective layer in a state where it can be viewed.

For example, as the first reflection layer 14, S
If a material having transparent reflectivity is adopted for both reflective layers, such as b ₂ S ₃ and ZnS for the second reflective layer 15, the first reflective layer can be seen as a mere transparent reflective hologram at first glance. 14 and the first
The difference in the interference effect due to the optical path difference of the reflected light between the portion where the reflection layer 14 and the second reflection layer 15 are formed is further increased.
If the material having the transparent reflectivity is a material having a different refractive index, the portion where only the first reflection layer 14 is formed and the first reflection layer 14 are formed.
The difference in the intensity of the reflected light caused by the difference in the number of reflection surfaces between the reflection layer 14 and the portion where the second reflection layer 15 is formed causes a difference in the intensity distribution of the reproduced hologram image. A picture or the like can be hidden in the hologram image, and the forgery prevention effect and the design can be improved.

Further, for example, the first reflection layer 14 is made of Al with a thickness of 100 °, and the second reflection layer 15 is made of Al.
When the material of the first reflective layer 14 and the material of the second reflective layer 15 are substantially the same such that the thickness of the first reflective layer 14 is 300 The transparency is enhanced, and the thick portions of the first reflective layer 14 and the second reflective layer 15 have high reflectivity. Therefore, the desired pattern or the like is simply held in the reflective layer itself so as to be visible. However, since the materials are substantially the same, the sense of discomfort can be reduced.

The pressure-sensitive adhesive layer 16 is for attaching the hybrid hologram 10 to the surface of the adherend 20. In this embodiment, an acrylic resin, a vinyl resin, a polyester resin, a urethane resin, an amide resin is used. An adhesive such as a resin, an epoxy resin, a rubber resin, or an ionomer resin can be used. The pressure-sensitive adhesive layer 16 has a thickness of 0.1 to 5
It may be about 0 μm, but preferably 1 to 10 μm.

Next, a first embodiment of the method for producing a hybrid hologram according to the present invention will be described with reference to FIG. First, as shown in FIG. 3A, a PET film is used as a base layer 11 and a resin layer 13 such as a mixture of a thermoplastic resin and a thermosetting resin formed on the base layer 11 is formed.
Then, an embossing process for forming a hologram image is performed to form a relief surface 13a. Next, as shown in FIG. 3B, on the relief surface 13a of the resin layer 13,
First reflective layer 14 on which a metal compound such as Sb ₂ S ₃ is deposited
Then, a second reflective layer 15 on which a metal such as Al is deposited is formed.

Further, as shown in FIG. 3C, a mask layer 21 is formed on a portion where the second reflective layer 15 is to be left by a mask printing method such as silk screen printing or gravure printing. Thereafter, as shown in FIG. 3 (D), an alkaline solution such as sodium hydroxide or a solvent such as ferric chloride is used to form a second layer other than the mask layer 21.
The reflection layer 15a is removed, and if necessary, after neutralization with an acid or the like, the alkali or the like is washed away with water to stop the progress of metal corrosion.

FIG. 4 is a process chart showing a modification of the embodiment of FIG. The second reflective layer 15 may be removed as follows. Instead of performing mask printing in FIG. 3C, a photoresist 22 is applied to the entire surface as shown in FIG. 4A, and an original film 23 on which a pattern is recorded as shown in FIG. And exposed with a UV lamp 24. After the light-exposed part is removed by washing, FIG.
As shown in FIG. 3C, the exposed portion of the second reflection layer 15 is removed by etching with an alkaline solution or the like, and the remaining photoresist 22 is removed, whereby the same hybrid hologram 10 as that shown in FIG. Thus, when the contact exposure is performed, the second reflection layer 15 can be formed with high accuracy.

FIG. 5 is a process chart showing a second embodiment of the method for producing a hybrid hologram according to the present invention. Note that the portions performing the same functions as those in the above-described first embodiment will be described with the same reference numerals. First, embossing for forming a hologram image is performed on a resin layer 13 such as an ultraviolet curable resin formed on the base layer 11 using a PET film as the base layer 11, thereby forming a relief surface 13a. Further, as shown in FIG.
A first reflective layer 14 formed by depositing a metal compound such as ZnS is formed on the third relief surface 13a.

Next, as shown in FIG. 5B, a mask layer 25 is formed by printing a mask with a water-soluble ink on a portion where the second reflective layer 15 is to be left. After this, FIG.
As shown in (C), a second reflective layer 15 on which a metal such as Al is deposited is formed on the entire surface. Finally, the water-soluble ink 18
Is washed and removed together with the laminated second reflection layer 15 to obtain the hybrid hologram 10 as shown in FIG.

FIG. 6 is a process chart showing a third embodiment of the method for producing a hybrid hologram according to the present invention. First, a resin layer 13 made of polyethylene is coated with Al to a thickness of 100 Å.
A first reflective layer 14 is formed, and a mold having irregularities corresponding to the relief of the hologram is applied to a side of the resin layer 13 on which the first reflective layer 14 is formed,
By applying heat and pressure, a hologram relief surface 13a (14a) is formed on the resin layer 13 and the first reflection layer 14 (see FIG. 6A). Next, a mask 26 having a space such as a desired pattern is brought into contact with the side of the resin layer 13 on which the first reflective layer 14 is formed (see FIG. 6B), and Al is vacuumed to a thickness of 300 °. By vapor deposition and removing the mask 26 from the relief surface 14a, a hybrid hologram as shown in FIG. 6C can be obtained. In this case, the portion having only the first reflection layer 14 has high transparency, and the portion having the first reflection layer 14 and the second reflection layer 15 has high reflectivity.

The present invention is not limited to the embodiments described above, and various modifications and changes can be made, which are also within the scope of the present invention. For example, the first reflection layer 14 is formed on the resin layer 13, and the second reflection layer 1 is partially formed on the first reflection layer 14.
After forming 5, embossing may be performed.

[0031]

As described above in detail, according to the present invention, since the transparent thin film layer and the second reflective layer are hybridized, the conventional hologram cannot be used due to the difficulty in the manufacturing process, materials and processing techniques. In comparison, the forgery prevention effect is dramatically improved. In addition, the hologram can be easily determined as true or false without any troublesome operation such as mechanical reading.

Furthermore, since the transparent thin film layer and the second reflective layer is mixed, novel holographic obtain unprecedented.

[Brief description of the drawings]

FIG. 1 is a sectional view schematically showing an embodiment of a hybrid hologram according to the present invention.

FIG. 2 is a top view of FIG.

FIG. 3 is a process chart showing a first embodiment of a method for producing a hybrid hologram according to the present invention.

FIG. 4 is a process diagram showing a modification of the embodiment of FIG. 3;

FIG. 5 is a process chart showing a second embodiment of the method of manufacturing a hybrid hologram according to the present invention.

FIG. 6 is a process chart showing a third embodiment of the method for producing a hybrid hologram according to the present invention.

FIG. 7 is a cross-sectional view schematically illustrating an example of a conventional hologram.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 mixed molded hologram 11 base layer 12 hologram forming layer 13 resin layer 14 first reflective layer 15 second reflective layer 16 adhesive layer 20 adherend 21 mask layer 22 photoresist 23 original film 24 UV lamp 25 mask layer

Claims (7)

(57) [Claims] 1. A hologram comprising a resin layer on which a hologram image is recorded so that white light can be reproduced, and a reflection layer formed on the back surface of the resin layer, wherein the reflection layer is formed on the back surface of the resin layer. Transparent, reflective
1. A hybrid hologram, comprising: a transparent thin film layer having a property; and a second reflective layer partially formed on a back surface of the transparent thin film layer . 2. The hybrid hologram according to claim 1, wherein said transparent thin film layer and said second reflection layer are made of substantially the same material. 3. The method according to claim 1, wherein the transparent thin film layer is a transparent or translucent layer , and the second reflective layer is a reflective layer having a metallic luster. Item 3. The hybrid hologram according to Item 2. 4. The method for producing a hybrid hologram according to claim 1, wherein a hologram image is formed on one side of a resin layer on which white light can be reproduced. A step of forming the transparent thin film layer , a step of overlaying a mask having a desired pattern on one side of the transparent thin film layer , and a step of forming the second reflective layer only on a portion of the transparent thin film layer that does not overlap with the mask. Forming a mixed hologram by vapor deposition. 5. The method for producing a hybrid hologram according to claim 1, wherein the transparent thin film layer is provided on one side of a resin layer on which a hologram image is recorded so as to be capable of reproducing white light. Forming; forming the second reflective layer on one side of the transparent thin film layer ; forming a mask layer in a desired pattern on one side of the second reflective layer; Removing the portion of the second reflective layer that is not formed. 6. The method of manufacturing a hybrid hologram according to claim 1, wherein the hologram image is formed on one side of a resin layer on which white light can be reproduced. Forming the transparent thin film layer ; forming a mask layer in a desired pattern on one side of the transparent thin film layer ; forming the second reflective layer on one side of the transparent thin film layer and the mask layer And a step of removing the second reflective layer in a portion where the mask layer is formed. 7. directly to the resin layer, or after forming the transparent thin film layer on the resin layer, or even the transparent
The hybrid hologram according to any one of claims 4 to 6, further comprising a step of forming a relief surface of the hologram image after forming the second reflection layer on the thin film layer. Production method.