KR101682015B1 - Security film with viewing angle characteristics - Google Patents

Security film with viewing angle characteristics Download PDF

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Publication number
KR101682015B1
KR101682015B1 KR1020150185979A KR20150185979A KR101682015B1 KR 101682015 B1 KR101682015 B1 KR 101682015B1 KR 1020150185979 A KR1020150185979 A KR 1020150185979A KR 20150185979 A KR20150185979 A KR 20150185979A KR 101682015 B1 KR101682015 B1 KR 101682015B1
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KR
South Korea
Prior art keywords
film
layer
direction
security
thickness
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Application number
KR1020150185979A
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Korean (ko)
Inventor
김현수
신화섭
서범준
Original Assignee
한국조폐공사
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Priority to KR1020150185979A priority Critical patent/KR101682015B1/en
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Publication of KR101682015B1 publication Critical patent/KR101682015B1/en

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/003Light absorbing elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04Interconnection of layers
    • B32B7/12Interconnection of layers using interposed adhesives or interposed materials with bonding properties

Abstract

The present invention relates to a security film attached on a confidential document, comprising transparent layer repeated at least one direction perpendicular to a thickness direction of a film and an opaque layer, and determining the thickness of the film and the thickness of at least one direction of the transparent film in order to exhibit an effect to restrict vision when the document is viewed from an observation angle inclined to a predetermined angle or more. The thickness of at least one direction of the transparent layer is not uniform, and a fluorescent layer is inserted between the transparent layer and the opaque layer. According to the present invention, a view angle restriction effect and/or a fluorescent effect to restrict vision according to the observation angle are exhibited, and are deformed according to a position, so a security film with an excellent forgery/alternation prevention effect can be provided.

Description

{SECURITY FILM WITH VIEWING ANGLE CHARACTERISTICS}

FIELD OF THE INVENTION The present invention relates to security films, and more particularly, to security films applied to secure documents.

Security documents such as banknotes, securities, gift certificates, passports, ID cards, and product labels generally use security features to prevent forgery and falsification. Also, these security factors are increasingly included in the product or its package for activation.

The security element is embedded in the security document or is formed in the form of a film and attached to the surface of the security document, and usually has a special visual effect. These visual effects include hologram, moire magnification, fluorescence, and parallactic motion.

However, security elements are always exposed to the risk of forgery, and development of security element technology other than the usual general security elements is always required.

Korean Patent No. 1089435

SUMMARY OF THE INVENTION It is an object of the present invention to provide a security film having a novel structure and a security effect different from existing security elements.

Specifically, it is an object of the present invention to provide a security film having a viewing angle limiting effect.

It is another object of the present invention to provide a security film having a different viewing angle depending on the position of a film.

Another object of the present invention is to provide a security film whose fluorescence intensity changes according to an observation angle.

According to an aspect of the present invention, there is provided a security film to be attached to a security document, the security film comprising a transparent layer and an opaque layer repeated in one direction perpendicular to the film thickness direction, The thickness of the film and the one-direction thickness of the transparent layer are determined so that the effect of restricting the field of view is observed when observed at the true viewing angle, and the thickness of the transparent layer in the one direction is relatively thin, Wherein the transparent portion has a relatively thick second portion in the direction of the first portion, and the first portion has a narrow viewing angle relative to the second portion. At this time, the thickness of the transparent layer in the one direction may be gradually changed in the one direction.

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Further, the security film according to the present invention may be such that a fluorescent layer is inserted between the transparent layer and the opaque layer. At this time, the thickness of at least one of the transparent layer, the opaque layer and the fluorescent layer may not be uniform in the one direction.

Further, the security film according to the present invention may further comprise an adhesive layer or a print layer formed on the lower surface of the film.

The security document according to another aspect of the present invention may be any one of a banknote, a security, a gift certificate, a lottery ticket, a passport, an identification card, a credit card, a product package, and a product label.

According to the present invention, a security film having a new structure and security effect different from existing security elements can be provided.

Specifically, the security film according to the present invention has a structure in which the transparent layer and the opaque layer are repeated in one direction perpendicular to the thickness direction of the film, so that the viewing angle limiting effect is exhibited.

In addition, according to the security film of the present invention, different viewing angles are provided depending on the position of the film.

Further, according to the security film of the present invention, there is an effect that the fluorescence intensity changes according to the observation angle.

1 is a perspective view of a security film according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the security film of FIG. 1 attached to a security document.
3 is a cross-sectional view of a security film according to another embodiment of the present invention.
4 is an exemplary view of the security film manufacturing method of FIG.
5 is a perspective view of a security film according to another embodiment of the present invention.
6 is a cross-sectional view of a security film according to another embodiment of the present invention.
FIG. 7 is a conceptual diagram illustrating a change in fluorescence effect according to an observation angle of the security film according to the embodiment of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 to or limited by the embodiments. In describing the various embodiments of the present invention, corresponding elements are denoted by the same names and the same reference numerals.

The present invention relates to a security film for securing the security of a security document by attaching it to the surface of the security document. In the present invention, the security document must be understood in a broad sense to include objects to which a security film is attached for the purpose of forgery prevention or activation such as banknotes, securities, gift certificates, lotteries, passports, ID cards, credit cards, product packages, product labels And is not limited to documents made of paper.

1 is a perspective view of a security film 1 according to an embodiment of the present invention. 1, a security film 1 according to an embodiment of the present invention includes a transparent layer 110 in at least one direction (x direction in the drawing) perpendicular to the thickness direction (z direction in the figure) And the opaque layer 120 are repeated.

The transparent layer 110 is not particularly limited as long as it is an optically transparent material, and may be a flexible plastic material for easy attachment to security documents. For example, it may be urethane acrylate, urethane melamine, polymethyl methacrylate, polyurethane, polyester, nylon, silicone, polyethylene terephthalate (PET), polycarbonate (PC) or a mixture thereof.

The opaque layer 120 is not particularly limited as long as it is an optically opaque material, and may be a flexible plastic material for easy attachment to security documents. For example, a material mixed with carbon black in urethane acrylate, urethane melamine, polymethyl methacrylate, polyurethane, polyester, nylon, silicone, polyethylene terephthalate (PET), polycarbonate .

Fig. 2 is a cross-sectional view of the security film 1 of Fig. 1 attached to the surface of the security document 10. Fig. Although not shown in FIG. 2, an adhesive layer may be included between the security film 1 and the security document 10, and the adhesive layer may be included in one configuration of the security film 1. A printing layer on which a predetermined character, a figure, a pattern, an image or the like is printed may be included between the security film 1 and the security document 10, and the printing layer may be included as one configuration of the security film 1.

2, the security document 10 or the print layer (not shown) can be identified through the transparent layer 110 when viewed in a direction perpendicular to the surface of the security film 1, 10 are obliquely viewed from the side, the opaque layer 120 can not identify the underlying security document 10 or the print layer. That is, the portion to which the security film 1 is attached is limited to the range of the predetermined angle of view by the opacifying layer 120. The viewing angle a in which the observer can identify the underlying security document 10 or print layer through the security film 1 is determined by the thickness t of the film and the thickness d in the x direction of the transparent layer 110 , the larger t is, and the smaller d is, the narrower the viewing angle a becomes.

3 is a cross-sectional view of a security film 2 according to another embodiment of the present invention. The security film 2 of FIG. 3 has a structure in which the transparent layer 110 and the opaque layer 120 are repeated in at least one direction (x direction in the drawing) perpendicular to the thickness direction of the film (z direction in the drawing) And is different from the security film 1 of Figs. 1 and 2 in that the thickness of the transparent layer in at least one direction is not constant. That is, the security film 2 of FIG. 3 has a first portion (d1) in which the thickness of the transparent layer 110 in the direction in which the transparent layer 110 and the opaque layer 120 are repeated is relatively thin, d2) second portion. According to such a configuration, the viewing angle is relatively narrow (viewing angle a) because the opaque layer 120 is repeated at narrow intervals in the first part, and the viewing angle is relatively wide because the opaque layer 120 is repeated at wide intervals in the second part (Viewing angle b). Therefore, there is an effect that different viewing angle characteristics are displayed depending on the position of the security film 2.

In other words, when the security film 2 is observed while tilting gradually, the field of view is limited in the first portion first, and when the security film 2 is further inclined, the field of view is limited to the second portion. Only the portion (i.e., the second portion) can identify the underlying secure document. This effect is different from the simple viewing angle limiting effect shown in Figs. 1 and 2. When the security film 2 is attached to the security document, the forgery and falsification of the security document becomes more difficult.

In FIG. 3, only two portions of the transparent layer 110 in the x direction have thicknesses d1 and d2. However, the security film 2 may include three or more portions having different thicknesses of the transparent layer 110. FIG. For example, the thickness of the transparent layer 110 in the x direction may be gradually changed. According to this configuration, when the security film 2 is tilted and observed from the side, the effect of increasing the area of the portion where the field of view is limited as the viewing angle moves away from the direction perpendicular to the film can be realized. In addition, when the thickness of the transparent layer 110 is changed irregularly without being gradually changed in any one direction, it is possible to realize an effect of irregularly appearing portions where the field of view is restricted as the viewing angle is away from the direction perpendicular to the film .

FIG. 4 exemplarily shows a method of manufacturing the security film 2 of FIG. The security film 2 can be manufactured by laminating the transparent layer 110 and the opaque layer 120 in advance with predetermined thicknesses d1 and d2 and then cutting the transparent layer 110 and the opaque layer 120 by a desired film thickness t as shown in FIG. Such a method is illustrative, and the method for producing the security film according to the present invention is not limited thereto.

5 is a cross-sectional view of a security film 3 according to another embodiment of the present invention. The security film 3 has a structure in which the fluorescent layer 130 is inserted between the transparent layer 110 and the opaque layer 120 so that the opaque layer 120 and the fluorescent layer 130 are perpendicular to the film thickness direction And is repeated in at least one direction. By inserting the fluorescent layer 130 in this way, a fluorescence effect can be obtained in addition to a simple viewing angle limiting effect.

6 is a sectional view of the security film 4 according to another embodiment of the present invention in which the fluorescent layer 130 is inserted between the transparent layer 110 and the opaque layer 120 and the thickness of the transparent layer 110 is changed . 6, the security film 4 has the transparent layer 110, the opaque layer 120, and the fluorescent layer 130 in at least one direction (x direction in the drawing) perpendicular to the film thickness direction (z direction in the drawing) And includes a first portion where the thickness of the transparent layer 110 is relatively thin (d1) and a second portion where the thickness of the transparent layer 110 is relatively thick (d2). According to this configuration, different viewing angle characteristics are exhibited depending on the position of the security film 4, and an effect of partially changing the fluorescence intensity is exhibited.

FIG. 7 illustrates an image observed while tilting the security film 4 of FIG. 6 from side to side. Fig. 7 (b) shows the case of observation in the direction perpendicular to the film, and Fig. 7 (a) and Fig. 7 (a), when the security film 4 is observed while being tilted to the right, since the fluorescent layer 130 is hidden from the opaque layer 120, the transparent layer 110 and the opaque layer 130 Substantially the same effect as that of the security film 3 shown in Fig. However, when the security film 4 is observed while tilting to the left as shown in FIG. 7 (c), the observer can observe the fluorescence effect by the fluorescent layer 130. When the security film 4 is tilted over a certain angle, The intensity of the fluorescence starts to decrease. At this time, the field of view of the first part is limited so that the security document under the security film 4 can not be identified through the first part. As the angle of tilting the security film 4 is increased, the fluorescence intensity of the first portion is continuously decreased, and the field of view of the second portion of the relatively wide viewing angle is limited beyond a predetermined angle, and the fluorescence intensity of the second portion is also gradually decreased do.

6, when the fluorescent layer 130 is formed on both sides of the non-transparent layer 120, the security film 130 is formed on the right side of the opaque layer 120. In this case, The same effect can be obtained.

In FIG. 6, only two portions of the transparent layer 110 in the x direction have thicknesses d1 and d2. However, the security film 4 may include three or more portions having different thicknesses of the transparent layer 110. FIG. For example, the thickness of the transparent layer 110 in the x direction may be gradually changed. According to this configuration, when obliquely observing the security film 4 from the side, it is possible to realize an effect of gradually increasing the area of the area where the field of view is limited as the observation angle is away from the direction perpendicular to the film, A gradual change effect can be realized. In addition, when the thickness of the transparent layer 110 is changed irregularly without being gradually changed in any one direction, as the viewing angle is shifted away from the direction perpendicular to the film, a portion where the field of view is limited and an irregular fluorescence effect Effect can be realized.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Embodiments of the present invention may be implemented independently, or may be implemented in combination. Accordingly, the scope of protection of the present invention should be determined by the description of the claims and their equivalents.

1, 2, 3, 4: Security film
10: Security documents
110: transparent layer
120: opaque layer
130: Fluorescent layer

Claims (8)

  1. A security film attached to a security document,
    And a transparent layer and an opaque layer repeated in one direction perpendicular to the film thickness direction,
    The thickness of the film and the one-direction thickness of the transparent layer are determined so that the effect of limiting the field of view is observed when observed at an oblique viewing angle that is more than a certain angle,
    Wherein the first portion includes a first portion having a relatively thin thickness of the transparent layer in the one direction and a second portion having a relatively thick thickness of the transparent layer in the one direction, Wherein the film is relatively narrow.
  2. delete
  3. The method according to claim 1,
    Wherein the thickness of the transparent layer in the one direction gradually changes in the one direction.
  4. The method according to claim 1,
    Wherein a fluorescent layer is inserted between the transparent layer and the opaque layer.
  5. 5. The method of claim 4,
    Wherein the thickness of at least one of the transparent layer, the opaque layer and the fluorescent layer is not constant in the one direction.
  6. The method according to claim 1,
    Further comprising an adhesive layer or a printing layer formed on the lower surface of the film.
  7. A secure document to which the security film of any one of claims 1 to 6 is affixed.
  8. 8. The method of claim 7,
    A security document, a bank note, a security certificate, a gift certificate, a lottery ticket, a passport, an identification card, a credit card, a product package, and a product label.
KR1020150185979A 2015-12-24 2015-12-24 Security film with viewing angle characteristics KR101682015B1 (en)

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KR1020150185979A KR101682015B1 (en) 2015-12-24 2015-12-24 Security film with viewing angle characteristics

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Application Number Priority Date Filing Date Title
KR1020150185979A KR101682015B1 (en) 2015-12-24 2015-12-24 Security film with viewing angle characteristics

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KR101682015B1 true KR101682015B1 (en) 2016-12-02

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR930003329B1 (en) * 1988-03-04 1993-04-26 아. 클라인레, 하. 뵈트게 Security element in the form of a thread or a ribbon for intertion in security document and process for product
KR20060121216A (en) 2003-11-21 2006-11-28 나노벤션스 인코포레이션 Micro-optic security and image presentation system
JP2007531003A (en) * 2004-03-25 2007-11-01 シーワ ピーアンドシー カンパニー.,リミテッド. Security film
KR20110029934A (en) * 2009-09-17 2011-03-23 액츠 주식회사 Privacy film

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR930003329B1 (en) * 1988-03-04 1993-04-26 아. 클라인레, 하. 뵈트게 Security element in the form of a thread or a ribbon for intertion in security document and process for product
KR20060121216A (en) 2003-11-21 2006-11-28 나노벤션스 인코포레이션 Micro-optic security and image presentation system
JP2007531003A (en) * 2004-03-25 2007-11-01 シーワ ピーアンドシー カンパニー.,リミテッド. Security film
KR20110029934A (en) * 2009-09-17 2011-03-23 액츠 주식회사 Privacy film

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