JP2017083605A - Transfer foil, forgery prevention medium and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer foil capable of obtaining a forgery prevention effect and high design property with less number of processes and higher alignment accuracy, so as to be used in a forgery prevention medium having an overt function and a covert function, and also to provide a forgery prevention medium and a manufacturing method thereof.SOLUTION: A transfer foil includes, on a substrate, a retardation layer arranged at least in two or more orientations, an OVD function layer, and an adhesive layer sequentially laminated. The retardation layer has a first position alignment mark. The OVD function layer has a second position alignment mark at a location overlapping the first position alignment mark.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transfer foil, an anti-counterfeit medium, and a method for producing the same, which can provide an anti-counterfeit effect and excellent design properties.

  Conventionally, securities such as banknotes, gift certificates, passports, and authentication media have been pasted with a medium that is difficult to forge as a countermeasure against forgery. In this case, the authenticity determination is performed by visual determination (so-called overt function) or determination using a verifier (so-called covert function).

  An anti-counterfeit medium on which an arbitrary image by OVD having an overt function is formed is easily forged because it can be visually recognized. Therefore, in recent years, there has been proposed an anti-counterfeit medium that combines anti-counterfeiting technology using a polymer liquid crystal material that cannot be visually confirmed but appears as a latent image when the filter is turned and can determine the authenticity. (Patent Document 1)

By the way, such an anti-counterfeit medium is used, for example, in the form of an adhesive label or a transfer foil.
These media can be made thinner when used in the form of a transfer foil than when used in the form of an adhesive label. If the anti-counterfeit medium is thinned, the medium attached to the article can be easily broken when it is peeled off. That is, the reuse of the forgery prevention medium can be made impossible, which is more effective. Therefore, the above-mentioned medium is often in the form of a transfer foil particularly when used for the purpose of preventing forgery.

The transfer foil is generally transferred in stripes or transferred with spots. In the case of an anti-counterfeit medium that is transferred by a spot and further combines an overt function and a covert function, if both the overt image and the covert image are fixed patterns, the anti-counterfeit effect and the design are higher than the continuous pattern.
However, in order to align the overt image and the covert image, it is necessary to form an alignment mark in advance by printing or the like, and use it to align the overt image and the covert image. However, when the alignment mark is formed by printing or the like, the number of processes increases by the number of processes. In addition, the conventional alignment mark may not have sufficient alignment accuracy.

Patent No. 4054071

  In view of the above problems, an object of the present invention is to provide a transfer foil, an anti-counterfeit medium, and a method for manufacturing the same, which can obtain an anti-counterfeit effect and high designability with a small number of steps and high alignment accuracy.

  According to a first aspect of the present invention, there is provided a transfer foil in which a retardation layer, an OVD functional layer, and an adhesive layer, which are arranged on at least two axes or more, are sequentially laminated on a base material. A transfer foil is provided, wherein a first alignment mark is provided, and a second alignment mark is provided in a position overlapping the first alignment mark in the OVD functional layer.

  According to a second aspect of the present invention, the second alignment mark is composed of a diffraction grating having a spatial frequency of 2000 lines / mm to 4000 lines / mm and an aspect ratio of 0.5 to 2. A transfer foil according to claim 1 is provided.

  According to a third aspect of the present invention, the second alignment mark is composed of a diffraction grating having a spatial frequency of 2500 lines / mm to 3500 lines / mm and an aspect ratio of 0.5 to 2. A transfer foil according to claim 1 is provided.

  According to the fourth aspect of the present invention, in the transfer foil manufacturing method according to any one of claims 1 to 3, the positional deviation between the first alignment mark and the second alignment mark, Provided is a method for producing a transfer foil, wherein the detection is performed through a polarizer.

  According to a fifth aspect of the present invention, there is provided an anti-counterfeit medium characterized by using the transfer foil according to any one of claims 1 to 3.

  According to the transfer foil of the present invention, when the first alignment mark provided on the retardation layer and the second alignment mark provided on the OVD functional layer are overlapped, the positional deviation is detected via the polarizer. Therefore, it is possible to perform positioning by performing reading and feedback control, and thus a desired transfer foil can be obtained with high positional accuracy. In addition, since the alignment mark can be formed simultaneously with the steps of forming the retardation layer and the OVD functional layer, the number of steps can be reduced.

The conceptual sectional view showing an example of the embodiment of the transfer foil by the present invention. (A) The conceptual diagram which shows the pattern of a phase difference layer in an example of embodiment of this invention. (B) The conceptual diagram which shows the pattern of an OVD functional layer in an example of embodiment of this invention. The conceptual diagram which shows a part of image with which the pattern of the phase difference layer and the OVD functional layer overlapped in an example of embodiment of this invention. The conceptual diagram which shows the case where the 1st alignment mark and the 2nd alignment mark are accumulated and observed from the base material side in an example of embodiment of this invention. The conceptual diagram which shows the case where the mode that the alignment mark overlaps in the example of FIG. 4 is observed through a polarizer. The conceptual diagram which shows the case where the 1st alignment mark and the 2nd alignment mark are accumulated and observed from the base-material side in another example of embodiment of this invention. The conceptual diagram which shows the case where the mode that the alignment mark overlaps in the example of FIG. 6 is observed through a polarizer. The conceptual diagram which shows the case where the 1st alignment mark and the 2nd alignment mark are accumulated and observed from the base-material side in another example of embodiment of this invention. The conceptual diagram which shows the case where the mode that the alignment mark overlaps in the example of FIG. 8 is observed through a polarizer.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a transfer foil and an anti-counterfeit medium according to the present invention and a manufacturing method thereof will be described in detail with reference to the drawings. In addition, this invention is not limited only to these embodiment.

  FIG. 1 is a conceptual cross-sectional view showing an example of an embodiment of a transfer foil in the present invention. The transfer foil 10 has a configuration in which a retardation layer 12, an OVD functional layer 13, and an adhesive layer 14 are sequentially laminated on a base material 11.

FIG. 2 shows the retardation layer 12 and the OVD functional layer 13 including alignment marks. FIG. 2A shows the phase difference layer 12 including the phase difference element 15 and the phase difference element 16 arranged in a pattern. The retardation layer 12 has a first alignment mark 17. The phase difference layer 12 is a layer in which light passing through this layer generates a predetermined phase difference compared to light passing through the air. Both the phase difference 15 and the phase difference 16 are transparent, but are different from each other. A phase difference can be generated. Using this, for example, the optical axis can be set to 0 ° and 45 °.
FIG. 2B is a plan view showing the OVD functional layer 13 of FIG. 1, and includes an OVD 18 and a second alignment mark 19 arranged in a pattern. The OVD pattern 18 can have a diffraction grating structure, for example, and the second alignment mark 19 can have a polarization characteristic by providing a plurality of grooves with a pitch equal to or smaller than the visible light wavelength.
2A and 2B are provided so that the phase difference layer pattern, the OVD functional layer pattern, the first alignment mark, and the second alignment mark overlap each other at the same position. It shows a state.

FIG. 3 shows an observation image of the anti-counterfeit medium after spot transfer of the transfer foil shown in FIG. In the figure, the cedar tree-shaped pattern in a circle is OVD 18, the star pattern is the phase retarder 16, and the background is the phase retarder 15. Observation is made visually, and observed from the phase retarder side after transfer.
FIG. 3A is an image diagram when the phase retarders 15 and 16 and the OVD 18 are combined.
FIG. 3B is an image when the anti-counterfeit medium is visually observed. Since the phase retarders 15 and 16 cannot be visually observed, only the OVD 18 is observed.
FIG. 3 (c) is an image view when observing with a polarizer (not shown). The pattern of the phase retarder 16 is visualized by passing through the polarizer.
Further, FIG. 3D is an image diagram observed when the polarizer is rotated, and the pattern formed by the phase retarder 16 is negative-positive inverted due to the polarization effect. Further, since the phase difference layer 12 pattern and the OVD functional layer 13 pattern are aligned when the transfer foil 10 is manufactured, stars on the tree that are not visually observed as shown in FIG. It became possible to observe by twisting the polarizer.

4, 6, and 8 show an example of how the first alignment mark 17 and the second alignment mark 19 are overlapped when the retardation layer 12 and the OVD functional layer 13 are overlapped. (A) is the same position, (b) is displaced in the flow direction of printing, (c) is displaced in the width direction of the transfer foil, (d) is the flow direction and The image figure at the time of position shift in the width direction is shown.
FIGS. 5, 7, and 9 show images observed when detection is performed via the polarizer 20 with respect to the respective positional shifts of FIGS. 4, 6, and 8. As an example, the case where the position of the pattern of the second alignment mark 19 is changed is illustrated. However, the present invention is not limited to this. For example, even if the pattern of the first alignment mark 17 is changed, the first and second alignment marks 19 Both may be changed.

Next, the material of each layer constituting the transfer foil 10 will be described.
(Base material)
As the base material 11, an unstretched film produced by extrusion or casting, a stretched film produced by stretching, or the like can be used. The stretched film includes a uniaxially stretched film and a biaxially stretched film depending on how to stretch, and both can be used.

  These unstretched films and stretched film materials include cellophane, polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyolefin (PO), ethylene vinyl alcohol (EVOH), polyvinyl alcohol (PVA), polychlorinated. Examples thereof include vinyl, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), nylon, acrylic resin, and triacetyl cellulose (TAC) film.

(Retardation layer)
A material having birefringence can be used for the retardation layer 12 included in the transfer foil of the present invention. Birefringence means that the refractive index of a substance varies depending on the direction of the optical axis, and therefore the speed of light varies when passing through the substance. Therefore, a phase difference is generated in the light after passing through the substance by the difference in the passing speed. As such a material, for example, a liquid crystal material can be used.

  Moreover, the phase difference layer 12 is arrange | positioned at two or more axes. As a method of arranging the optical axis of the retardation layer in two or more axes, the alignment film is subjected to an alignment treatment in a multiaxial direction, and a liquid crystal is applied thereon, whereby a multiaxially aligned liquid crystal can be obtained. . For the alignment treatment of the alignment film for aligning the liquid crystal material, for example, a rubbing alignment method or a photo alignment method can be used. The retardation value can be determined by the birefringence and film thickness of the liquid crystal.

  The photo-alignment method is a method in which the alignment film is irradiated with anisotropic light such as polarized light or non-polarized light from an oblique direction to induce rearrangement of molecules in the alignment film or anisotropic chemical reaction. In this method, anisotropy is imparted to the alignment film, whereby the liquid crystal molecules are aligned. Examples of the photo-alignment mechanism include photo-anisotropy of azobenzene derivatives, photo-dimerization and crosslinking of derivatives such as cinnamic acid ester, coumarin, chalcone and benzophenone, and photolysis of polyimide and the like.

  Specifically, pattern exposure is performed with polarized light in an appropriate wavelength band or non-polarized light from an oblique direction. For example, when aligning in the biaxial direction, pattern exposure is performed by covering the portion whose orientation direction is to be changed with a photomask, and further, the direction is changed to expose unexposed portions covered with the photomask. good. Alternatively, after the entire surface is once exposed to pattern, it may be partially covered with a photomask and changed in direction to be exposed again.

  The rubbing alignment method is a method of rubbing an alignment film created by applying a polymer solution on a substrate with a cloth. The property of the alignment film surface changes in the rubbing direction and liquid crystal molecules are aligned in this direction. It is a thing. For the alignment film, polyimide, PVA, or the like is used.

  When aligning the optical axis in the biaxial direction, cover the part whose orientation direction is to be changed with a mask, rub it with a cloth, remove the mask, then cover the rubbed part with the mask and turn the direction again. After changing and rubbing with a cloth, the mask is removed. Alternatively, the entire surface may be rubbed with a cloth, partially covered with a mask, the direction may be changed, and the mask may be removed after being rubbed with a cloth.

  As a method for forming these alignment films, a known method such as a gravure coating method or a micro gravure coating method can be used.

  A retardation layer can be obtained by providing a liquid crystal material on the alignment film subjected to the alignment treatment. Such liquid crystal materials include photocurable liquid crystal monomers with acrylates at both ends of the mesogenic group, polymer liquid crystals cured with EB or UV, polymer liquid crystals with mesogenic groups in the polymer main chain, molecular main chain itself A liquid crystalline polymer in which the is aligned can be used. The orientation of these liquid crystals can be promoted by heat treatment at a temperature slightly below the NI point at which phase transition occurs after coating.

(Phase difference value)
As the phase difference value, for example, when a polarizer is used for a verifier (not shown) and a reflection layer is incorporated in the transfer foil, the phase difference value may be 1 / 4λ. When a transparent substrate is used, a polarizer is disposed on the back surface of the transfer medium, and a polarizer is used for the verifier, 1 / 2λ is effective.
For example, when a circular polarizer is disposed on the back surface of the transfer medium and a circular polarizer is used as a verifier, 1 / 8λ is effective. In either case, 1 / 4λ, 1 Any phase difference value of / 2λ and 1 / 8λ may be used.

(OVD functional layer)
As shown in FIG. 1, the OVD functional layer 13 is provided by embossing 13 b on the OVD forming layer 13 a to form an OVD 18. OVD (Optical Variable Device) is an image display that uses light interference, and is a display that produces a color shift that changes in color depending on the representation of the stereoscopic image and the viewing angle. Medium.
Particularly, the OVD having a structure such as a hologram or a diffraction grating includes a relief type that records light interference fringes on a plane as a fine uneven pattern, and a volume type that records interference fringes in a volume direction.

  In addition, although the method is different from the OVD functional layer 13 in the present invention, a material that causes a color change (color shift) depending on the viewing angle, such as a multilayer film in which thin films of ceramics or metal materials having different optical characteristics are laminated, is also an example. is there. These OVDs can be said to be effective means for preventing counterfeiting because they give a unique impression such as stereoscopic images and color shifts and require advanced manufacturing techniques.

  As a method for producing a relief type hologram or a relief type diffraction grating, mass production can be carried out using a relief type press plate comprising a fine concavo-convex pattern forming a hologram or a diffraction grating, respectively. That is, a fine uneven pattern can be duplicated by heating and pressing the OVD forming layer 13a with a press plate.

As a material for the OVD forming layer 13a, for example, a thermoplastic resin such as an acrylic resin, an epoxy resin, a cellulose resin, or a vinyl resin, an acrylic polyol having a reactive hydroxyl group, a polyester polyol, or the like with a polyisocyanate as a crosslinking agent. Addition and cross-linked urethane resins, thermosetting resins such as melamine resins, epoxy resins, and phenol resins can be used alone or in combination. Moreover, even if it is a thing other than the above, as long as it can form the said uneven | corrugated pattern, you may use it suitably. Further, a filler or the like may be added to such an extent that the OVD effect is not impaired, thereby further improving transferability.
The OVD forming layer 13a is provided in a pattern by a known printing method.

In order to increase the diffraction efficiency of the OVD 18 in which the OVD forming layer 13a is formed by embossing, the material constituting the relief surface is a high refractive index material such as TiO ₂ , Si ₂ O ₃ , SiO, Fe ₂ O ₃ , ZnS, etc. In addition, metal materials such as Al, Sn, Cr, Ni, Cu, and Au, which have a higher reflection effect, may be used, and these materials may be used alone or in layers. These materials are formed by a known thin film forming technique such as vacuum deposition or sputtering. These materials can also be used as a reflective layer.

  As the adhesive layer 14, for example, a heat-sensitive adhesive that exhibits tackiness when heated can be used. The adhesive layer 14 is provided by applying a resin satisfying the performance to a substrate using a gravure coater, a micro gravure coater, a roll coater, or the like. As a material that can be used, thermoplastic resins such as acrylic resin, vinyl chloride vinyl acetate copolymer, epoxy, and EVA can be used.

(First alignment mark)
As shown in FIG. 2A, the first alignment mark 17 is provided in the retardation layer 12 at the same time as the retardation elements 15 and 16. As an example, FIG. 2 shows a case where the phase retarders 15 and 16 are arranged in a pattern on two axes. In this case, the first alignment mark 17 may be arranged in a different direction from the phase retarders 15 and 16, but may be arranged in the same direction as the phase retarder 16 in order to reduce the number of steps. Moreover, although the example in which the first alignment mark 17 is uniaxially oriented is shown in FIG. 2, the inside of the first alignment mark 17 may be further divided to be multiaxially oriented.

  The first alignment mark 17 is used for alignment when forming the OVD 18 shown in FIG. At that time, the first alignment mark 17 may be sandwiched between polarizers and read by a sensor. Then, since the alignment axes of the first alignment mark 17 and its surroundings (corresponding to the phase retarder 15 portion) are different, the contrast of the image is obtained. The OVD 18 may be formed by embossing while reading it with a sensor and aligning it.

(Second alignment mark)
The second alignment mark 19 is provided at the same time as the OVD 18 is formed by embossing the OVD forming layer 13a. The positional deviation is detected from the overlapping state with the first alignment mark 17 and the alignment of the pattern of the retardation layer 12 and the OVD 18 is performed. The second alignment mark 19 may be provided with the same structure as that of the OVD. However, the second alignment mark 19 can be provided by, for example, a relief type diffraction grating in which a plurality of grooves are arranged, and the spatial frequency is 2000 lines / mm to 4000 lines. It is preferable that the height / width ratio (aspect ratio) of the grooves of the diffraction grating is in the range of 0.5 to 2.
More preferably, the spatial frequency of the diffraction grating is in the range of 2500 lines / mm to 3500 lines / mm as a more optimal range.

  The diffraction grating having such a structure has a very special visual effect. Unlike a diffraction grating generally used, this structure has a feature that diffracted light returns in a direction close to the direction of incident light, and the diffracted light has polarization characteristics. Further, the reflected light also has polarization characteristics. For example, if the arrangement of the diffraction grating is tilted by 90 °, the reflected polarization characteristics also change by 90 °. However, the present invention is not limited to this, and a fine concavo-convex pattern or a color shift can be used similarly to OVD.

  When the above-described diffraction grating is used as the second alignment mark 19, the polarization characteristics change depending on the optical axes of the phase retarders 15 and 16 of the first alignment mark 17 by combining with the first alignment mark 17. When observed through a polarizer, contrast can be generated in the second alignment mark 19. Thereby, when manufacturing the transfer foil of this invention, it becomes possible to read the position shift at the time of superimposing the 1st position alignment mark 17 and the 2nd position alignment mark 19 with higher precision.

(Alignment)
When the OVD 18 is formed by embossing, the first alignment mark 17 is read by a laser sensor or the like while being sandwiched between polarizers, and embossing is performed while performing alignment.

(Detection of misalignment)
After the OVD 18 is formed by embossing, the sensor detects the overlapping state of the first alignment mark 17 and the second alignment mark 19 to confirm the positional deviation. Hereinafter, the positional deviation will be described with reference to FIGS. 4 and 5 as an example.

After the OVD 18 is formed, the overlapping state of the first alignment mark 17 and the second alignment mark 19 is read by an image sensor via a polarizer and feedback controlled. FIG. 4A shows the case where the first alignment mark 17 and the second alignment mark 19 are coincident, that is, the image of the phase difference layer 12 and the image of the OVD 18 are coincident. ing.
In this case, the image read by the sensor through the polarizer is as shown in FIG.
Since the positions of the second alignment mark 19 and the first alignment mark 17 coincide, a dark gray square is detected. In order to achieve this state with no positional deviation, feedback control is performed when a positional deviation has occurred.

  FIG. 4B shows a case where the image of the retardation layer 12 and the image of the OVD 18 are displaced in the flow direction. In that case, the image read through the polarizer is as shown in FIG. 5B, and the portion of the second alignment mark 19 that overlaps the first alignment mark 17 is observed in dark gray. The portion of the second alignment mark 19 that does not overlap the one alignment mark 17 is observed in light gray, and in the example of FIG. 4B, a square of dark gray on the lower side and light gray on the upper side is detected. Become.

  FIG. 4 (c) shows an example in which the position is displaced in the width direction, and FIG. 4 (d) shows an example in which the position is displaced in the flow direction and the width direction. Since the portion where the mark 19 overlaps is observed in dark gray, and the portion where the first alignment mark 17 and the second alignment mark 19 do not overlap is observed in light gray, the portions shown in FIGS. Thus, a square that is partly light gray is detected. A positional shift amount is detected from these images, and feedback control is performed based on the information so that the alignment state becomes as shown in FIG.

  Further, as shown in FIGS. 6 and 7, the second alignment mark 19 may be arranged in a multiaxial arrangement instead of a simple uniaxial arrangement. Also in this case, feedback control is performed so that the alignment state becomes as shown in FIG.

  Further, if the second alignment mark 19 is formed in a rhombus or the like so as to enter the first alignment mark 17 as shown in FIGS. 8 and 9, only the flow direction of printing, only the width direction, and flow Since the image is clearly different from the case where there is a deviation in the direction and the width direction, the positional deviation is easy to detect.

(Transcription)
As a transfer method, the transfer foil is transferred to an object to be transferred by spot transfer using an up-down method or stripe transfer using a roll transfer method. The substrate of the material to be transferred can be used regardless of paper as long as it is in the form of a sheet such as a resin film, a metal plate, and a glass plate.

  The anti-counterfeit medium to which the transfer foil according to the present invention is transferred is as shown in FIG. 3 (a), and the phase retarders 15 and 16 cannot be visually observed. Only the pattern of OVD18 is observed. Here, when the polarizer is turned on, an image in which the patterns of the phase retarders 15 and 16 are visualized as shown in FIGS. 3C and 3D is observed.

  Examples of the present invention will be described below.

Using Lumirror 19F60 as base material 11, an alignment film solution in which alignment film resin was dissolved was applied by microgravure to form a film. Thereafter, the cover was covered with a mask provided with a star-shaped phase retarder 16 and a first alignment mark 17 arranged in succession, and was rubbed with a rubbing cloth in the flow direction of the original fabric.
Further, the portion rubbed in the flow direction was covered with a mask, tilted in the direction of 45 ° with respect to the flow direction, and rubbed with a rubbing cloth to produce an alignment film.

  Thereafter, UV curable liquid crystal UCL-008 manufactured by DIC Corporation was applied by a micro gravure so as to have a phase difference value of λ / 4, and UV curing was performed in an oxygen atmosphere. As a result, the flow direction and phase retarders 15 and 16 inclined by 45 ° in the flow direction were obtained, respectively.

  Next, the OVD formation layer which consists of an acrylic polyol and isocyanate was provided in the whole surface with the direct gravure printing method. Thereafter, the first alignment mark 17 was sandwiched between the polarizers, and while being read by the line sensor, heat embossing was applied with a plate provided with the continuously arranged OVD 18 and the second alignment mark 19 to form an OVD functional layer. After that, the misalignment between the first alignment mark 17 and the second alignment mark 19 is read by an image sensor through a polarizer, and alignment feedback control is performed. The star pattern of the retardation layer 12 and the cedar of the OVD 18 are controlled. The wood pattern was aligned.

Thereafter, an aluminum thin film was formed using a vacuum vapor deposition method so as to have a thickness of 500 mm.
Furthermore, an acrylic resin was provided as an adhesive layer 14 on the entire surface by microgravure to obtain a transfer foil of the present invention.

  The obtained transfer foil was transferred to a transfer object using a hot stamp. When the transferred anti-counterfeit medium was visually observed, only the OVD18 cedar handle was observed. Next, when the polarizer was turned on and observed, a star pattern appeared exactly at the top of the cedar tree, and when this polarizer was rotated, the star pattern was negative-positive inverted.

  From the above experimental results, it was confirmed that the desired transfer foil can be obtained with high positional accuracy and the alignment marks can be formed simultaneously with the steps of forming the retardation layer and the OVD functional layer, so that the number of steps can be reduced.

DESCRIPTION OF SYMBOLS 10 Transfer foil 11 Base material 12 Phase difference layer 13 OVD functional layer 13a OVD formation layer 13b Emboss 14 Adhesive layers 15 and 16 Phase difference element 17 First alignment mark 18 OVD
19 Second alignment mark 20 Polarizer

Claims (5)

A transfer foil in which a retardation layer, an OVD functional layer, and an adhesive layer arranged at least biaxially on a base material are sequentially laminated,
A transfer foil, wherein a retardation layer is provided with a first alignment mark, and an OVD functional layer is provided with a second alignment mark at a position overlapping the first alignment mark.   The transfer according to claim 1, wherein the second alignment mark is composed of a diffraction grating having a spatial frequency of 2000 lines / mm to 4000 lines / mm and an aspect ratio of 0.5 to 2. Foil.   2. The transfer according to claim 1, wherein the second alignment mark is composed of a diffraction grating having a spatial frequency of 2500 to 3500 lines / mm and an aspect ratio of 0.5 to 2. Foil.   4. The method for manufacturing a transfer foil according to claim 1, wherein a displacement between the first alignment mark and the second alignment mark is detected through a polarizer. 5. A method for producing a transfer foil.   An anti-counterfeit medium using the transfer foil according to any one of claims 1 to 3.