KR102040076B1 - Security device comprising micro lens and the fabrication method - Google Patents

Security device comprising micro lens and the fabrication method Download PDF

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Publication number
KR102040076B1
KR102040076B1 KR1020130166882A KR20130166882A KR102040076B1 KR 102040076 B1 KR102040076 B1 KR 102040076B1 KR 1020130166882 A KR1020130166882 A KR 1020130166882A KR 20130166882 A KR20130166882 A KR 20130166882A KR 102040076 B1 KR102040076 B1 KR 102040076B1
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KR
South Korea
Prior art keywords
image
micro lens
color
lens array
security device
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KR1020130166882A
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Korean (ko)
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KR20150077923A (en
Inventor
길정하
채종훈
최일훈
김종재
주성현
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한국조폐공사
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/148—Transitory images, i.e. images only visible from certain viewing angles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/003—Lens or lenticular sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Credit Cards Or The Like (AREA)
  • Stereoscopic And Panoramic Photography (AREA)

Abstract

The present invention provides a spacer, a micro lens array consisting of an array of a plurality of micro lenses formed on the spacer, a first image of a first color formed under the spacer and observed in a first direction through the micro lens array. An image forming layer comprising: a laser marking layer formed below the spacer, the laser marking layer including second images of a second color, the second image being viewed in a second direction through the micro lens array; Color and the second color relates to a security device comprising a micro-lens, characterized in that the different colors, according to the present invention, compared to the conventional security device, each image is formed in the correct position as intended and its security characteristics Not only is this further improved, but also its manufacturing method has a simple effect.

Description

Security device including micro lens and manufacturing method thereof {SECURITY DEVICE COMPRISING MICRO LENS AND THE FABRICATION METHOD}

The present invention relates to a security device including a micro lens and a method of manufacturing the same, and more particularly, to a security device and a method of manufacturing a security device that changes color or image depending on the viewing angle.

In order to prevent forgery of various security products that require security such as banknotes, checks, passports and ID cards, various technologies using optical or electromagnetic principles such as hidden lines and security films have been developed. Among them, the security device using the optical principle is very useful for various security products in that the general consumer can intuitively check the forgery, since the optical effect can be visually recognized without a separate sensing means.

As a security device using an optical principle, there is a device for observing a specific image through a micro lens array, and recently, a technique for improving a security effect by allowing a plurality of images to be observed has been introduced. Such a device includes, for example, a device disclosed in Japanese Patent Laid-Open No. 2011-215202, whose structure is schematically shown in FIG. Referring to FIG. 1, the conventional security device 100 includes a micro lens array 120 having a plurality of lenticular lenses 121 arranged in a predetermined direction on an upper surface of a transparent spacer 110, and a micro lens array 120. And an image forming layer 130 formed at a distance spaced apart from the spacer 110 by a thickness. In this case, the image array 150 is formed in a form in which different images 151, 152, and 153 are sequentially and periodically printed on the bottom surface of the spacer 110 so as to correspond to the lenticular lenses 121. Included.

According to the conventional security device 100, different images are observed according to the viewing angle viewed through the micro lens array 120. That is, when observing in the first direction D1 in the normal direction perpendicular to the plane in which the lenticular lenses are arranged, the first image 151 is observed, and the viewing angle is tilted or viewed from the side to view the second angle ( When it changes to D2), the 2nd image 152 different from the 1st image 151 is observed. In addition, when the viewing angle is changed in the third direction D3 by tilting the security device in another direction or observing from another side, the third image 153 that is different from the first image 151 and the second image 152 is observed. do. The conventional security device 100 has a superior security effect than when only one image is observed due to the characteristic that a plurality of images are observed according to the viewing angle as described above, and general users can easily check whether the forgery is visible to the naked eye. . In particular, when the security device 100 is scanned or copied, only the first image 151 observed in a specific viewing angle D1 direction appears, thereby preventing forgery due to copying or the like.

Meanwhile, a printing method may be used as a method of forming the image array 150 under the spacer 110, but a method of forming a recess in the image forming layer 130 and filling it with ink is preferred. In order to form the respective images 151, 152, and 153 in different colors, the recess formation and the ink filling process must be repeated for each image. That is, after the recesses for forming the first image 151 are formed in the image forming layer 130 and filled with ink of the first color, and then the recesses for forming the second image 152 are formed. The ink is filled with the second color ink, and then the recesses for forming the third image 153 are formed and then filled with the third color ink. The reason for using this method is that it is difficult to fill each recess with ink of different colors when the recesses corresponding to the first to third images are formed at once. This method has the advantage of improving the security effect by forming each image in a different color, but there is a problem that the manufacturing process is very complicated.

In addition, since the image array 150 is formed in a separate process from the microlens array 120 forming process, it is difficult to accurately form each image at the focal position of the lenticular lens 121. That is, in order for the characteristic as intended by the security device 100 to appear, each of the images 151, 152, and 153 must be exactly formed at the focal position of the lenticular lens 121 in the corresponding viewing angle directions D1 and D2 D3. When the microlens array 120 is formed on the spacer 110 and the image array 150 is formed on the bottom surface thereof, each of the images 151, 152, and 153 is formed at the corresponding viewing angles D1, D2, and D3. It is not easy to accurately form the lenticular lens 121 in the focal position. This causes the phenomenon that an unclear image is observed, and when the images are not correctly aligned with each other and an interval between each other causes an error compared to the original design, a plurality of images are mixed and observed at a specific viewing angle. As this may occur, solving these problems is an important task.

In addition, in order to precisely identify whether the security device 100 is forged or not, the error in the position of forming each image should be strictly managed. That is, even if it is difficult to discriminate with the naked eye, for example, when the second image 152 is designed to be formed at the focal position in the second direction D2, whether the image is forged or not is formed by using the precision recognition device. In the manufacturing process of the security device 100, if an error occurs in the formation position of each image, the precision perception itself is meaningless.

Japanese Patent Laid-Open No. 2011-215202

The present invention is to solve the problems of the prior art as described above, to provide a security device and a manufacturing method comprising a microlens so that a plurality of images observed in different colors according to the viewing angle is formed in a simpler method Its purpose is to.

In addition, the present invention provides a security device comprising a microlens such that a plurality of images observed in different colors according to the viewing angle are formed at the exact focal position of the microlens at intervals as intended by the design, and a manufacturing method thereof. There is another purpose.

It is another object of the present invention to provide a security device including a micro lens and a method of manufacturing the same, which allow an image to be formed accurately at a focus position at an angle as intended by the design.

Security device including a micro lens according to an aspect of the present invention for achieving the above object, a micro lens array consisting of a spacer, an array of a plurality of micro lenses formed on the spacer, is formed on the lower portion of the spacer And an image forming layer including first images of a first color observed in a first direction through the micro lens array, and separately formed from the image forming layer under the spacer and in a second direction through the micro lens array. And a laser marking layer comprising second images of the second color observed, wherein the first color and the second color are different colors, and further comprising an additional security element layer below the spacer. can do. In addition, it may further include an adhesive layer for bonding the security device to the security document.

In this case, the laser marking layer includes third images of a third color observed in a third direction through the micro lens array, wherein the third color may be the same as or different from the second color, and the second The images and the third images may be formed on different laser marking layers. The laser marking layer may include a light absorber material, and the second image and the third image may be formed by the light absorber material absorbing laser light.

Further, the first image is formed at a focus position when light is incident on the micro lens in the first direction, and the second image is a focal position when light is incident on the micro lens in the second direction. The third image may be formed at a focal position when light is incident on the microlens in the third direction.

The first direction may be a normal direction perpendicular to the surface of the micro lens array, and the focal length of the micro lens in the first direction may be 40 μm or less.

According to another aspect of the present invention, there is provided a method of manufacturing a security device including a micro lens, comprising: (a) applying a lens array resin to an upper surface of a spacer film and an image forming layer resin on a lower surface thereof, (b) an upper roll and a lower roll Roll casting while passing through to form a microlens array in the lens array resin, and to form a recess for forming the first image in the image forming layer resin, (c) for curing the lens array resin and the image forming layer resin Curing, (d) filling the recess with ink of a first color to form an image forming layer including first images, (e) applying a laser marking layer below the image forming layer, (f And irradiating a laser beam to the laser marking layer to form an image in the laser marking layer. In this case, step (f) may include irradiating laser light in two or more directions.

In addition, an alignment device for aligning the micro lens array and the concave portion is provided on the upper roll and the lower roll, and the upper roll and the lower roll are aligned with the alignment device during the roll casting process. The alignment device may be configured to include a laser transmitter and a laser receiver.

The security document according to another aspect of the present invention is a security document including a security device, the security device is configured to include a micro lens array on the top of the spacer, an image forming layer and a laser marking layer on the bottom, The spacer is made of a transparent film of a predetermined thickness, the microlens array is made of an array of a plurality of microlenses, and the image forming layer is configured to display first images of a first color observed in a first direction through the microlens array. Wherein the laser marking layer includes second images of a second color viewed through a microlens array in a second direction, wherein the laser marking layer has the second color of different colors when viewed in the first direction and the second direction. The first image and the second image are observed. The security device may be a hidden line, and the security document may be a banknote.

According to the security device including a microlens according to the present invention and a method of manufacturing the same, the first image is formed at the same time as the microlens and other images are precisely formed at the focal position of the microlens using a laser, and thus different from each other depending on the viewing angle. There is an effect that a plurality of images observed in color are formed in a simpler way.

In addition, according to the security device and a manufacturing method comprising a micro-lens according to the present invention, since the first image is formed at the same time as the microlens and other images are precisely formed at the focal position of the microlens by using a laser, There is an effect that a plurality of images observed in different colors are formed at the exact focal position of the micro lens at intervals as intended by the design.

In addition, according to the security device including a microlens according to the present invention and a method for manufacturing the same, some images are formed at the focal position of the microlens by using a laser, so that the image is accurately positioned at the focal position at an angle as intended by the design. This has the effect of being formed.

1 is a cross-sectional view of a conventional security device.
2 is a cross-sectional view of a security device including a micro lens according to a first embodiment of the present invention.
3 is a cross-sectional view of a security device including a micro lens according to a second embodiment of the present invention.
4 is a flowchart illustrating a method of manufacturing a security device according to the present invention.
5 is a conceptual diagram for explaining the roll casting step.
6 is a view showing the shape of the upper roll and the lower roll of the casting roll.
7 is an exemplary view in which the alignment device is installed on the upper roll and the lower roll.
8 is a conceptual diagram in which a second image and a third image are formed by laser marking.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or restricted by the embodiments.

In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

2 is a cross-sectional view of a security device including a micro lens according to a first embodiment of the present invention.

Referring to FIG. 2, the security device 200 according to the first embodiment of the present invention includes a spacer 210, a micro lens array 220 formed on the spacer 210, and a lower portion of the spacer 210. It is formed including an image forming layer 230 and a laser marking layer 240 formed on.

The spacer 210 serves to support the security device 200 as a whole and is configured to separate the image forming layer 230 or the laser marking layer 240 from the micro lens 221 by the focal length of the micro lens 221. As long as it is transparent, the material and thickness thereof are not particularly limited, but in order to be applied to a silver wire having a total thickness of about 50 μm or less inserted into a banknote or the like, it may be a polyethylene terephthalate (PET) film having a thickness of about 40 μm or less.

The microlens array 220 formed on the spacer 210 includes a periodic arrangement of the plurality of microlenses 221, where the microlenses 221 extend in a direction perpendicular to the ground of FIG. 2. It may be a spherical or aspherical semi-cylindrical lens. Here, the aspherical surface may be conical, elliptical, parabolic, etc., and the focal position of the image forming layer 230 or the laser marking layer 240 is considered in consideration of the thickness of the spacer 210 because the focal position varies depending on the viewing angle. Its shape can be adjusted to be formed. For example, in FIG. 2, when the light is incident in the first direction D1 perpendicular to the surface of the microlens array, the light is incident on the first image 251 in the direction D2 tilted to the right. The shape of the microlens 221 may be adjusted so that the focal position in the case where the focus position is formed in the third image 253 when light is incident on the second image 252 and in the direction D3 tilted to the left. have. In FIG. 2, the laser marking layer 240 is lower than the image forming layer 230. In this case, the focal length when the light is incident in the second direction D2 and the third direction D3 is set to zero. The shape of the microlenses should be determined so as to be longer than the focal length when light is incident in one direction D1.

The microlens 221 may be formed of an energy curable resin, for example, an ultraviolet curable resin, and may be formed of a compound having a carboxyl group that is excellent in releasability, moldability, adhesion to a substrate and provides a high refractive index. The material is not particularly limited.

In order to apply the security device 200 according to the present invention to a hidden line having a total thickness of about 50 μm or less, it is preferable that the focal length of the micro lens 221 is about 40 μm or less in thickness, so that the width of each micro lens 221 is It is preferable that it is 50 micrometers or less, and height is 15 micrometers or less.

An image forming layer 230 is formed below the spacer 210, and the image forming layer 230 includes first images 251 to correspond to each micro lens 221 in one-to-one correspondence. The first image 251 is formed at the focal position of the microlens 221 when light is incident in the first direction D1 through the microlens 221, and the first direction D1 is a microlens array ( 220) may be in a direction perpendicular to the surface. Of course, the first direction is not limited to the vertical direction, and the direction may vary depending on the angle at which the first image is to be observed.

The first image 251 is an image formed by filling the recessed portion formed on the lower surface of the image forming layer 230 with the ink of the first color, and may be a predetermined image, text, symbol, or figure. In this case, the size of the recess in which the ink of the first color is filled may range from 2 μm to 6 μm.

Also, the laser marking layer 240 formed under the spacer 210 includes a light absorber material that absorbs laser light energy in a laser wavelength range and converts the laser light energy into thermal energy, thereby discoloring or etching the laser light irradiated portion. The second image 252 is included to correspond to the microlens 221 in a one-to-one correspondence, and the third image 253 may be further included. The second image 252 is formed at the focal position of the microlens 221 when light is incident in the second direction D2 through the microlens 221, and the third image 253, which is selectively formed, is micro The light is formed at the focal position of the microlens 221 when the light is incident in the third direction D3 through the lens 221. In this case, the second direction D2 and the third direction D3 may vary depending on which angle the second image 252 and the third image 253 are to be observed.

As the light absorber material included in the laser marking layer 240, metal oxides such as carbon, carbon black, Sn (Sb) O 2 , TiO 2, and the like may be applied, and antimony (III) oxide, which is an anthracene or an infrared absorbing colorant, may be used. , Bismuth oxychloride and the like can be applied. In addition, a flake-type light absorber material such as synthetic or natural mica, talc, kaolin, glass flakes, SiO 2 flakes, and the like may be applied. In the present invention, the light absorber material included in the laser marking layer 240 is a technical idea of the present invention. It does not restrict | limit in particular in the range of.

In FIG. 2, although the laser marking layer 240 is formed under the image forming layer 230, the focal lengths in the second direction D2 and the third direction D3 may vary depending on the shape of the microlens 221. In a case in which the laser marking layer 240 is shorter than the first direction D1, the laser marking layer 240 may be positioned on the image forming layer 230.

In addition, although FIG. 2 illustrates that the first to third images form the image array 250, the present invention is not limited thereto, and at least two or more images may form the image array. In addition, although the second image 252 and the third image 253 are formed in one laser marking layer 240 in FIG. 2, two or more laser marking layers are provided and one or more images are formed in each laser marking layer. In addition, the position of each laser marking layer may be determined according to a focal length in the second direction D2 and the third direction D3.

The security device 200 according to the first embodiment of the present invention of FIG. 2 may be utilized for a partially exposed hidden thread inserted into a banknote or the like. That is, a portion of the micro lens array 220 is exposed to the surface of the banknote, and the image forming layer 230 and the laser marking layer 240 are inserted into the paper making up the banknote. In this case, the banknote is tilted at various angles through a hidden line. The security characteristic in which the observed image changes into the first image 251, the second image 252, and the third image 253 is exerted. In particular, if the shape or color of each image is different, the general consumer can intuitively check whether the forgery by the naked eye, which is not shown by copying, so it is excellent in preventing the forgery of banknotes.

In addition, the security device 200 according to the first embodiment of the present invention may be used attached to a predetermined position of various security documents such as a passport, ID card. In this case, by further including an adhesive layer on the lowermost portion (under the laser marking layer in Figure 2) of the security device 200 can be formed to be able to adhere to the security document.

3 is a schematic cross-sectional view of a security device including a micro lens according to a second embodiment of the present invention.

Referring to FIG. 3, the security device 300 according to the second embodiment of the present invention includes a spacer 210, a micro lens array 220 formed on the spacer 210, and a lower portion of the spacer 210. And an image forming layer 230, a laser marking layer 240, and an additional security element layer 260 formed thereon. That is, the security device 300 according to the second embodiment of the present invention differs only in that it further includes an additional Buan element layer 260 compared with the security device 200 according to the first embodiment of the present invention. The remaining configurations are the same as those described in the first embodiment section.

The additional security element layer 260 is to provide an additional security feature to the security device, and may include at least one of a fluorescent layer, a magnetic layer, and an infrared layer.

The fluorescent layer may be an ultraviolet fluorescent layer that exhibits fluorescence when irradiated with ultraviolet rays, an upconversion fluorescent layer that emits light having a wavelength shorter than that of incident light, and may be printed with ink containing a fluorescent pigment. Can be used.

The magnetic characteristic layer or the infrared characteristic layer is a layer that can be sensed using a separate detector capable of detecting each characteristic, and may be formed by printing ink each containing a magnetic pigment or an infrared pigment.

According to the security device 300 according to the second embodiment of the present invention, there is an advantage that an additional security effect can be obtained in addition to the security effect that different images are observed according to the viewing angle. For example, in the case of forming an image, a text, a figure, etc. with the fluorescent layer, the magnetic layer, or the infrared layer, which is the additional security element layer 260, the visually the same effect as the security device 200 of the first embodiment, In other words, it seems that there is only a security effect that different images are observed depending on the viewing angle, but using a separate detector can detect additional security elements, making forgery and alteration more difficult.

In this case, in FIG. 3, the additional security element layer 260 is formed below the image forming layer 230 and the laser marking layer 240, but is not limited thereto. The image forming layer 230 and the laser marking layer 240 are not limited thereto. ), Or between the image forming layer 230 and the laser marking layer 240.

The security device 300 according to the second embodiment of the present invention may also be utilized for a partially exposed hidden thread inserted into a banknote or the like like the security device 200 according to the first embodiment. That is, a portion of the micro lens array 220 is exposed on the surface of the banknote, and the image forming layer 230, the laser marking layer 240, and the additional security element layer 260 are inserted into the paper making up the banknote. When tilting at various angles, a security characteristic in which the image observed through the hidden line is changed into the first image 251, the second image 252, and the third image 253 is exerted. In addition, when a separate detector is used, The security characteristic that the security element is detected is exerted.

In addition, the security device 300 according to the second embodiment of the present invention may be used attached to a predetermined position of various security documents such as a passport, identification card. In this case, by further including an adhesive layer on the lowermost portion (under the additional security element layer in Figure 3) of the security device 300 can be formed to be able to adhere to the security document.

4 is a flowchart illustrating a manufacturing method of the security devices 200 and 300 according to the present invention, and FIGS. 5 to 8 are views for explaining each manufacturing method step in more detail. Hereinafter, a description will be given based on the manufacturing method of the security device 300 according to the second embodiment of the present invention. However, processes other than the process of forming the additional security element layer 260 may be equally applied to the first embodiment of the present invention. .

A method of manufacturing the security device 200 and 300 according to the present invention will be described with reference to FIGS. 4 to 8. First, the lens array resin 520 for forming the micro lens array is coated on the spacer 210, and the spacer An image forming layer resin 530 for forming an image forming layer is coated on the bottom surface of the 210 (S10). In this case, the space 210 may be a polyethylene terephthalate (PET) film having a thickness of about 40 μm or less, and the lens array resin 520 and the image forming layer resin 530 applied to the upper and lower portions thereof are somewhat soft when applied. The resin may be processed by roll casting, and then cured in a curing process using ultraviolet rays or heat.

Next, a roll casting process is performed while passing the spacer film 210 coated with the lens array resin 520 and the image forming layer resin 530 between the upper roll 600 and the lower roll 700. It is a step (S20) (refer FIG. 5). As shown in FIG. 6, the upper roll 600 has a concave mold 610 in the shape of a micro lens 221 on its surface, and the lower roll 700 has a convex mold 710 in the shape of a recess 531 on its surface. ), The lens array resin 520 is processed into a micro lens array 220 by a roll casting process passing between the upper roll 600 and the lower roll 700, and the image forming layer resin 530. In the recesses 531 are formed for ink filling. Although the shape of the concave mold 610 formed on the upper roll 600 corresponds to the micro lens 221 in FIG. 6, the concave mold 610 is formed in a rectangular cross-sectional shape and roll casted, for example. After the separate heat treatment process may be completed to the shape of the micro lens 221, this process method is well known, so a detailed description thereof will be omitted.

Meanwhile, in order for the first image 251 to be clearly observed through the micro lens array 220, the micro lens 221 and the concave portion 531 need to be exactly aligned and formed. The device may be provided. For example, the laser transmitter 620 is installed on the side of the upper roll 600, and the laser receiver 720 is installed on the side of the lower roll 700, so that the laser light from the laser transmitter 620 is laser. After adjusting the upper roll 600 and the lower roll 700 to the position correctly received by the receiver 720, the roll casting step may be performed, and the microlens 221 and the recess 510 are designed by this method. It can be formed by aligning to the exact position as intended by. In this case, the formation position of the concave portion 510 is preferably a focus position when light is incident in a direction perpendicular to the microlens 221, which can be calculated by the shape of the microlens 221. In addition, the laser transmitter 620 and the laser receiver 720 of FIG. 7 are just one example of an alignment device, and it will be apparent to those skilled in the art that various modifications are possible.

Referring back to FIG. 4, after the roll casting step S20, a curing step S30 for curing the lens array resin 520 and the image forming layer resin 530 is performed. When resin is used, ultraviolet curing, and when thermosetting resin is used, heat curing to cure the resin by heat can proceed.

Next, the ink filling step S40 is a step of completing the image forming layer 230 by filling ink of the first color into the recess 531 formed in the image forming layer resin 530. By the ink filling step S40, a first image 251 of the first color observed in the first direction D1 is formed, and the ink curing step may be further performed if necessary.

Next, the laser marking layer 240 is applied to the lower portion of the image forming layer 230 and laser marking is performed to form at least one image different from the first image (S50 and S60). The laser marking step S60 will be described with reference to FIG. 8. The first laser light 810 is provided through the microlens array 220 from the outside so that the second image 252 can be formed on the laser marking layer 240. The second laser light 820 is irradiated from the outside through the micro lens array 220 so that the third image 253 may be formed on the laser marking layer 240. The first laser light 810 and the second laser light 820 are irradiated so that a focal point can be formed at a position where the second image 252 and the third image 253 are formed, respectively, and the irradiation angle is the microlens 221. ), The thickness of the spacer 210 and the image forming layer 230 may be calculated.

Since the laser marking layer 240 includes the light absorber material, the second image 252 and the third image 253 are formed precisely at the focal position where the laser light 810, 820 is irradiated, and the light absorber material is properly applied. By selecting, the color of the second image 252 and the third image 253 can be formed in a color different from that of the first image 251. In addition, by adjusting the intensities of the first laser light 810 and the second laser light 820, it is possible to distinguish the colors of the second image 252 and the third image 253, and a plurality of laser marking layers are provided. The colors of the images formed by laser marking may be different by forming into layers and including different light absorber materials in each layer.

Next, forming an additional security element layer 260 to provide additional security characteristics (S70), it may be a step of printing an image, text, graphics, etc. with fluorescent ink, magnetic ink or infrared ink. .

In addition, although not shown in FIG. 4, a process of adding an adhesive layer for bonding and using the security device 200 according to the present invention to a security document may be further included.

According to this manufacturing method, the recess in which the first image 251 is formed is formed simultaneously with the microlens in a state where the upper roll 600 and the lower roll 700 are exactly aligned so that the first image 251 is in the first direction. Since the second image 252 and the third image 253 are formed by laser marking, the second image 252 and the third image 253 may be formed at the focal position of D1, and the laser beams 810 and 820 are irradiated at a pre-calculated angle. Can be formed at the exact focal position intended. Therefore, according to the present invention, when manufacturing a security device in which a plurality of images of different colors are observed at different viewing angles, compared to the conventional security device, each image is formed at an exact position as intended, and the security characteristic is further improved. The manufacturing method also has a simple effect.

Although described above with reference to the limited embodiments and the drawings, which are illustrative, it will be apparent to those skilled in the art that various modifications are possible within the scope of the technical idea of the present invention. In addition, the technical ideas described in the embodiments may be independently implemented, or may be combined with each other. Therefore, the protection scope of the present invention should be defined by the description of the claims and their equivalents.

100, 200, 300: security device
110, 210: spacer
120, 220: micro lens array
121, 221: microlenses
151, 251: first image
152, 252: second image
153, 253: third image
130, 230: image forming layer
240: laser marking layer
150, 250: image array
260: additional security element layer
520: lens array resin
530: image forming layer resin
600: upper roll
700: lower roll
620: laser transmitter
720: laser receiver

Claims (15)

Spacers;
A micro lens array formed of an array of a plurality of micro lenses of the same shape formed on the spacer;
An image forming layer formed under the spacer, the image forming layer including first images of a first color viewed through a micro lens array in a first direction;
A laser marking layer formed below the spacers, the laser marking layer being formed separately from the image forming layer and including second images of a second color observed in a second direction through the micro lens array;
Including;
The first color and the second color are different colors,
The first image is formed at a focus position when light is incident on the micro lens in the first direction,
The second image is formed at a focus position when light is incident on the micro lens in the second direction,
The first direction is a normal direction perpendicular to the surface of the micro lens array,
And a focal length of the microlens in the first direction is 40 [mu] m or less. The method of claim 1,
The laser marking layer includes third images of a third color viewed in a third direction through the micro lens array.
And the third color is the same as or different from the second color. The method of claim 2,
And the second images and the third images are formed on different laser marking layers. The method of claim 2,
And the third image is formed at a focal position when light is incident on the microlens in the third direction. The method of claim 1,
And an additional security element layer under the spacer. The method of claim 2,
The laser marking layer comprises a light absorber material,
And the second image and the third image are formed by the optical absorber material absorbing laser light. delete delete The method of claim 1,
Security device comprising a micro lens further comprises an adhesive layer for adhering the security device to the security document. As a manufacturing method of a security device including a micro lens,
(a) applying a lens array resin on the top surface of the spacer film and an image forming layer resin on the bottom surface;
(b) Roll casting while passing between the upper roll and the lower roll to form a microlens array formed of an array of a plurality of microlenses having the same shape in the lens array resin, and a recess for forming the first image in the image forming layer resin. Forming;
(c) a curing step for curing the lens array resin and the image forming layer resin;
(d) filling the recess with ink of a first color to form an image forming layer including first images;
(e) applying a laser marking layer below the image forming layer;
(f) irradiating a laser beam on the laser marking layer to form a second image of a second color in the laser marking layer;
Including,
The first color and the second color are different colors,
The first image is formed at a focus position when light is incident on the micro lens in a first direction,
The second image is formed at a focus position when light is incident on the micro lens in a second direction,
The first direction is a normal direction perpendicular to the surface of the micro lens array,
A focal length of the micro lens in the first direction is 40 μm or less, characterized in that the manufacturing method of a security device comprising a micro lens. The method of claim 10,
The upper roll and the lower roll is provided with an alignment device for aligning the micro lens array and the concave portion,
And a micro lens, wherein the upper roll and the lower roll are aligned with the alignment device during the roll casting process. The method of claim 11,
The alignment device is a manufacturing method of a security device comprising a micro lens, characterized in that comprising a laser transmitter and a laser receiver. The method of claim 10,
The step (f) is a method of manufacturing a security device comprising a micro lens, comprising the step of further irradiating the laser light in two or more directions to form a third image separately from the second image. A security document containing a security device,
The security device is configured to include a micro lens array on the spacer, an image forming layer and a laser marking layer on the bottom,
The spacer is made of a transparent film of a predetermined thickness,
The micro lens array is composed of an array of a plurality of micro lenses of the same shape,
The image forming layer includes first images of a first color viewed in a first direction through the micro lens array,
The laser marking layer includes second images of a second color viewed in a second direction through the micro lens array,
When viewed from the first direction and the second direction, the first image and the second image of different colors are observed,
The first image is formed at a focus position when light is incident on the micro lens in the first direction,
The second image is formed at a focus position when light is incident on the micro lens in the second direction,
The first direction is a normal direction perpendicular to the surface of the micro lens array,
And a focal length of the microlens in the first direction is 40 mu m or less. The method of claim 14,
The security device is a hidden line,
The security document is a security document, characterized in that the banknote.
KR1020130166882A 2013-12-30 2013-12-30 Security device comprising micro lens and the fabrication method KR102040076B1 (en)

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EP3405353A4 (en) 2016-04-22 2019-11-06 Wavefront Technology, Inc. Optical switch devices
KR101875566B1 (en) * 2017-01-25 2018-07-09 그린비월드(주) Security film for counterfeit prevention
CA3073365A1 (en) 2017-10-20 2019-04-25 Wavefront Technology, Inc. Optical switch devices
KR102459325B1 (en) * 2018-09-12 2022-10-27 한국조폐공사 A security document comprising of lens array and printed images and a preparation method thereof
CN209765087U (en) * 2019-04-09 2019-12-10 苏州苏大维格科技集团股份有限公司 Multilayer dynamic anti-counterfeiting film

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