A structure for enhancing the effect of endorsement image, anti-counterfeiting card, and endorsement method

Abstract

The present invention provides a structure for enhancing the effect of endorsement images, which can make the endorsement information appear clearer and ensure that the copied image of the endorsed information is clear and complete after copying the card. The structure comprises: a base layer serving as a support structure; a laser-etched layer for laser-annotating the information and carrying the endorsement image, disposed on one side of the base layer; and a composite surface layer disposed on the side of the laser-etched layer away from the base layer. The composite surface layer comprises a structural support layer embossed with a holographic micro-nanostructure. The holographic micro-nanostructure, which overlaps the endorsement image area, is fabricated using a grating with a period of 200 nm to 750 nm, a line width of 50 nm to 200 nm, and a groove depth of 100 nm to 160 nm. The composite surface layer also comprises a dielectric coating layer, formed by filling the surface where the holographic micro-nanostructure is located with a transparent oxide film with a refractive index greater than 1.8. The dielectric coating layer has a thickness of 10 nm to 400 nm and a transmittance of ≥20% in the 800 nm to 1100 nm wavelength range. The present invention also discloses an anti-counterfeiting card made using the structure for enhancing the effect of endorsement images and an endorsement method.

Description

Technical Field

[0001] The present invention relates to the technical field of card and certificate anti-counterfeiting, and in particular to a structure for enhancing the effect of endorsement image, an anti-counterfeiting certificate card, and an endorsement method. Background Art

[0002] In today's society, various card-based documents, represented by second-generation ID cards, are widely used in fields such as identity authentication, quick payment, and access control. A key step in the card-based document production process is to sign the cardholder's personalized information onto the card surface through printing, imprinting, or etching. This personalized information includes text information such as the cardholder's name, date of birth, address, and gender, as well as image information such as facial images and signatures. This information constitutes the card-based document's signature information. During the production process using laser printing and endorsement equipment, the signature template is signed onto the card surface through laser printing and other methods. Laser printing converts personalized information into a dot matrix laser beam, which is then scanned axially by a scanning mirror onto the photosensitive drum in the electronic imaging system for exposure. The resulting color image is then developed, transferred, fixed, de-charged, and cleaned.

[0003] However, in addition to personalized information, the information integrated on the surface of anti-counterfeiting cards also includes an anti-counterfeiting image for the card's own anti-counterfeiting function. Currently, most anti-counterfeiting images are partially transparent holographic anti-counterfeiting patterns, usually embedded in the card itself. However, the intersection of the holographic image and the personalized information endorsement area affects the clarity and legibility of the endorsement. In particular, when scanning or copying the entire card surface, some traces of the holographic image remain, affecting the clarity, aesthetics, and legibility of the copied image of the endorsement information. Summary of the Invention

[0004] To address the problem in the prior art of holographic images adversely affecting the recognition and copying of endorsement information on anti-counterfeiting cards, the present invention provides a structure for enhancing the effect of endorsement images. This structure can make the endorsement information appear clearer, and after copying the card, the copy image of the endorsement information is clear and complete. The present invention also discloses an anti-counterfeiting card made using this structure and a method for enhancing the effect of endorsement images on anti-counterfeiting cards.

[0005] The technical solution of the present invention is as follows: a structure for enhancing the effect of endorsement images, comprising: a base layer as a supporting structure, a laser etching layer for laser endorsement information and carrying the endorsement image arranged on one side of the base layer, characterized in that:

[0006] A composite surface layer is provided on a side of the laser etching layer away from the base layer, wherein the composite surface layer includes a structural support layer embossed with a holographic micro-nano structure;

[0007] The holographic micro-nanostructure that overlaps with the endorsed image area is made of a grating with a grating period of 200 nm to 750 nm, a line width of 50 nm to 200 nm, and a groove depth of 100 nm to 160 nm.

[0008] The composite surface layer also includes a dielectric coating layer, which is formed by filling a transparent oxide film with a refractive index greater than 1.8 on the structural surface where the holographic micro-nano structure is located. The dielectric coating layer has a thickness of 10nm~400nm and a transmittance of ≥20% in the 800nm~1100nm band.

[0009] It is further characterized by:

[0010] The structural support layer is formed by curing a polymer compound coating containing carbonate chain segments, has a thickness of 1 to 10 µm, and a light transmittance of ≥50% in the 800 nm to 1100 nm wavelength band;

[0011] The laser etching layer is made of a highly flexible special film made of polycarbonate or PETG. The thickness of the laser etching layer is 50µm to 300µm, and the absorption rate of the functional film in the 800nm ​​to 1100nm band is ≥50%;

[0012] The composite surface layer also includes a protective layer formed by curing a polymer compound coating containing carbonate chain segments and disposed on the dielectric coating layer. The protective layer has a thickness of 0.5µm to 20µm and a light transmittance of ≥50% in the 800nm ​​to 1100nm band.

[0013] The composite surface layer further includes a carrier substrate layer disposed between the structural support layer and the laser etching layer. The carrier substrate layer is made of the same material as the laser etching layer, has a thickness of ≥50µm, and has a light transmittance of ≥50% in the 800nm-1100nm band.

[0014] A white reflective layer is provided on one side of the base layer adjacent to the laser etching layer. The material of the reflective layer is the same as that of the laser etching layer. The thickness of the reflective layer is ≥50µm, and its reflectivity in the 800nm~1100nm band is ≥70%, and its transmittance is ≤10%.

[0015] An anti-counterfeiting card made of a structure that enhances the effect of endorsement images, characterized by:

[0016] The laser etching layer and the composite surface layer are symmetrically arranged on both sides of the base layer to form an anti-counterfeiting card that can be signed on both sides.

[0017] An anti-counterfeiting card made of a structure that enhances the effect of endorsement images, characterized by:

[0018] The laser etching layer and the composite surface layer are sequentially arranged on one side of the base layer, and a base layer is arranged on the other side of the base layer. The base layer includes a tough structure of polycarbonate or PETG material to form an anti-counterfeiting card that can be signed on one side.

[0019] A method for annotating a structure with enhanced image effects, characterized in that when laser annotating the laser-etched layer of an anti-counterfeiting card, the optical characteristics of the laser used for the annotating include: an optical band of 980 nm to 1100 nm, and an incident light angle of -45° to 45°.

[0020] It is further characterized by:

[0021] When laser signing the laser-etched layer of the anti-counterfeiting card, after the laser outputs the light source, the scanning galvanometer component deflects the light path and focuses the scene, and the focused light spot is scanned on the composite structure film layer. The spot diameter is 5µm ~50µm, and the image and text are printed.

[0022] The present invention provides a structure for enhancing the effect of annotated images, in which a color-changing effect is formed by a nano-grating contained in a holographic pattern made of a grating. Through the color-changing effect formed by the grating structure, the holographic image can only be observed in the direction of reflected light, and no holographic image imprint will remain during scanning and copying, thereby ensuring that the image formed after copying of the annotation information is clear and complete; by controlling the thickness of the dielectric coating layer, the optical path difference of the light beam reflected by the outer surface and the inner surface of the oxide film is an odd multiple of half the wavelength, resulting in destructive interference, and the user can clearly see the annotation information when passing through the dielectric coating layer; based on the grating structure in the technical solution of the present invention, a laser with an optical band of 980 nm ~ 1100 nm is used to pass through the composite optical film without interference, diffraction, reflection or absorption, and accurately etch the annotation image, thereby further improving the presentation effect of the annotation information; by setting the annotation laser with a spot diameter of 5µm ~ 50µm for the annotation operation, it is possible to present a bitmap image of ≥400DPI, thereby further ensuring the clarity and readability of the annotation image information. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a structure for enhancing the effect of endorsed images according to the present invention;

[0024] Figure 2 Schematic diagram of the laser incident angle in the laser etching method;

[0025] Figure 3 The light transmittance of the composite surface layer and dielectric coating layer made based on the technical solution of the present invention;

[0026] Figure 4 is the light absorption rate of the laser etching layer based on the technical solution of the present invention. DETAILED DESCRIPTION

[0027] like Figure 1 As shown, the present invention provides a structure for enhancing the effect of annotated images. As a base layer of a supporting structure, a laser etching layer 6 for laser annotating information and carrying annotated images is arranged on one side of the base layer. A composite surface layer is arranged on the side of the laser etching layer 6 away from the base layer. The composite surface layer includes a structural support layer 4 on which a holographic micro-nano structure 3 is pressed. The holographic micro-nano structure overlapping with the annotated image area is made of a dual-channel grating with a grating period of 200 nm to 750 nm, a line width of 50 nm to 200 nm, and a groove depth of 100 nm. nm~160nm; the composite surface layer also includes a dielectric coating layer 2, which is filled with a transparent oxide film with a refractive index greater than 1.8 on the structural surface where the holographic micro-nano structure 3 is located to form a dielectric coating layer 2, the thickness of which is 10nm~400nm, and the transmittance of the light in the 800nm~1100nm band is ≥20%; the grating structure in the technical solution of the present invention enables near-ultraviolet light, visible light and near-infrared light with a spectral band of 380nm~800nm ​​to be reflected in different directions, thereby making the anti-counterfeiting image formed by the anti-counterfeiting holographic micro-nano structure present a colorful effect.

[0028] The structural support layer 4 is made of a polymer compound coating containing carbonate chain segments, such as a UV coating that is cured by light curing and / or heat curing, has a thickness of 1-10 µm, and a light transmittance of ≥50% in the 800 nm-1100 nm wavelength band.

[0029] The laser etching layer 6 is a highly flexible special film of polycarbonate or PETG, with a thickness of 50µm to 300µm. The absorption rate of the functional film in the 800nm ​​to 1100nm band is ≥50%;

[0030] The composite surface layer also includes a carrier substrate layer 5 disposed between the structural support layer 4 and the laser etching layer 6. The carrier substrate layer 5 is made of the same material as the laser etching layer 6, has a thickness of 50µm or greater, and has a light transmittance of 50% or greater in the 800nm-1100nm band. The carrier substrate layer 5 serves as a structural layer for protecting the laser etching layer 6. Due to the similar material, the carrier substrate layer 5 generates a very strong bonding force during the hot pressing process, ensuring a strong bond between the layers of the anti-counterfeiting card. When the card is bent, this soft and elastic structural layer protects the laser etching layer, reducing the probability of the laser structure on the relatively fragile laser etching layer being damaged by bending during use. The thickness of the carrier substrate layer 5 is set to 50µm or greater, which gives the film layer greater surface tension, making it less prone to curling and better maintaining its structure. This also reduces production failures caused by static electricity during the production process.

[0031] A white reflective layer 7 is provided on the side of the base layer adjacent to the laser etching layer 6. The reflective layer 7 is made of the same material as the laser etching layer 6, has a thickness of 50 µm or greater, and a reflectivity of 70% or greater in the 800 nm to 1100 nm wavelength band. The reflective layer reflects incident light during laser etching and user use, thereby improving the signature and imaging effects of the signature image.

[0032] The composite surface layer also includes a protective layer 1 disposed on the dielectric coating layer 2 and formed by curing a polymer compound coating containing carbonate chain segments, such as a UV coating, through light curing and / or heat curing. The protective layer 1 has a thickness of 0.5µm to 20µm and a transmittance of ≥50% in the 800nm ​​to 1100nm band.

[0033] In an embodiment of the present invention, the structure of the anti-counterfeiting card made based on the structure for enhancing the effect of the signature image includes: a protective layer 1, a dielectric coating layer 2, a holographic micro-nano structure 3, a supporting layer 4, a bearing substrate layer 5, a laser etching layer 6, a reflective layer 7, and a core layer 8 for setting a range card chip, wherein the bearing substrate layer 5, the laser etching layer 6, the reflective layer 7, and the core layer 8 are made of polycarbonate or PETG, the protective layer 1, the holographic micro-nano structure 3, and the supporting layer 4 are made of a UV coating containing a polycarbonate-friendly raw material, and the dielectric coating layer 2 is an oxide film; when processed and formed through the heating lamination and cold pressing processes, the structural layers are bonded at the molecular level, and the formed anti-counterfeiting card is durable, and because of its material composition, the physical changes of the structural layers will not be caused by the processing process. Even after processing and forming, the transmittance and light reflectivity of each structural layer can be maintained, which can ensure clear imaging of the signature image.

[0034] By using the technical solution of the present invention, an anti-counterfeiting card that can be signed on one side can be made. The laser etching layer and the composite surface layer are arranged in sequence on one side of the base layer, and a base layer is arranged on the other side of the base layer away from the laser etching layer. The material of the base layer includes: a tough structure of polycarbonate or PETG material; the laser etching layer 6 and the composite surface layer can also be symmetrically arranged on both sides of the base layer to form an anti-counterfeiting card that can be signed on both sides.

[0035] A method for enhancing the image effect of an anti-counterfeiting card is characterized in that: when the laser etching layer of the anti-counterfeiting card is laser-marked, the optical characteristics of the laser used for the marking include: an optical band of 980 nm to 1100 nm, an incident light angle of -45° to 45°, and the like. Figure 2As shown; when the laser etching layer of the anti-counterfeiting card is laser-annotated, after the laser outputs the light source, it passes through the scanning galvanometer component to deflect the light path and focus the scene, and the focal spot is scanned on the composite structure film layer. The spot diameter is 5µm ~ 50µm, and the image and text are printed; by using a laser with a spot diameter of 5µm ~ 50µm for signing, a bitmap image of ≥400DPI can be presented, with a delicate effect and no obvious texture, ensuring that the signed image information can be presented to the user more clearly; the laser used for signing can use existing lasers such as: carbon dioxide gas lasers, YAG lasers, solid lasers, semiconductor lasers, etc., which can emit lasers in the band of 980 nm ~ 1100nm.

[0036] In the technical solution of the present invention, a composite surface layer is composed of a protective layer 1, a dielectric coating layer 2, a holographic micro-nano structure 3, a support layer 4, and a supporting substrate layer 5. By controlling the thickness and transmittance of each structural layer in the composite surface layer, the optical path difference generated by the light beams reflected from the outer surface and the inner surface of the film when the light enters the film is an odd multiple, thereby eliminating the interference effect of the film material, so that the range image and the signature image passing through the composite surface can be clearly displayed to the user; at the same time, a multi-layer composite thin film optical system is constructed, which uses the technology of transmitting and reflecting ultraviolet light, visible light and infrared light beams multiple times on each interface to achieve a high-brightness holographic effect, and can also pass through 980 nm ~ 1100 nm infrared laser, so that the laser equipment can accurately etch the signature information and accurately display it to the user.

[0037] Attachment Figure 3 In the figure, 1# curve represents the transmittance of the composite surface layer. 2# curve represents the transmittance of UV curing / thermocuring coating. The horizontal axis represents the wavelength of the incident light, and the vertical axis is the transmittance. Through the 1# curve, it can be observed that in the 860-1100nm band, the transmittance reaches 16.7%. Through the 2# curve, it can be observed that in the 860-1100nm band, the transmittance reaches 81.8%. Therefore, it can be judged that the transmittance of the dielectric coating is approximately 20.4%; through this set of experimental data, it can be seen that the transmittance of the composite surface layer and dielectric coating made based on the technical solution of the present invention can ensure that users can see clear signed image information.

[0038] Attachment Figure 4 is the absorptivity of the laser-etched layer. Sample 1 shows the absorptivity of the laser-etched layer at different wavelengths. The horizontal axis represents the wavelength of the incident light, and the vertical axis represents the absorptivity. The absorption curve for sample 1 shows that in the 800-1100nm band, the absorptivity of the laser-etched layer is ≥54%, further ensuring that the endorsement information can be clearly presented to the user.

Claims

1. A structure for enhancing the effect of endorsement images, comprising: As the base layer of the supporting structure, a laser etching layer for laser endorsement information and carrying the endorsement image is provided on one side of the base layer, characterized in that: A composite surface layer is provided on a side of the laser etching layer away from the base layer, wherein the composite surface layer includes a structural support layer embossed with a holographic micro-nano structure; The holographic micro-nanostructure that overlaps with the endorsed image area is made of a grating with a grating period of 200 nm to 750 nm, a line width of 50 nm to 200 nm, and a groove depth of 100 nm to 160 nm. The composite surface layer further includes a dielectric coating layer, which is formed by filling a transparent oxide film with a refractive index greater than 1.8 on the structural surface where the holographic micro-nano structure is located. The dielectric coating layer has a thickness of 10nm to 400nm and a light transmittance of ≥20% in the 800nm ​​to 1100nm band. The thickness of the dielectric coating layer is controlled so that the optical path difference between the light beams reflected from the outer and inner surfaces of the oxide film is an odd multiple of half the wavelength, resulting in destructive interference and eliminating the interference effect of the film material, ensuring that the user can clearly see the endorsement information through the composite surface layer; The grating structure in the holographic micro-nano structure allows near-ultraviolet light, visible light and near-infrared light in the spectral band of 380nm~800nm ​​to be reflected in different directions, so that the anti-counterfeiting image formed by the anti-counterfeiting holographic micro-nano structure presents a colorful effect.

2. The structure for enhancing the effect of endorsement images according to claim 1, characterized in that: The structural support layer is formed by curing a polymer compound coating containing carbonate chain segments, has a thickness of 1 to 10 μm, and a light transmittance of 50% or more in the 800 nm to 1100 nm wavelength band.

3. The structure for enhancing the effect of endorsement images according to claim 1, characterized in that: The laser etching layer is made of a highly flexible special film made of polycarbonate or PETG. The thickness of the laser etching layer is 50µm to 300µm, and the absorption rate of the functional film in the 800nm ​​to 1100nm band is ≥50%.

4. The structure for enhancing the effect of endorsement images according to claim 1, characterized in that: The composite surface layer also includes a protective layer disposed on the dielectric coating layer and formed by curing a polymer compound coating containing carbonate chain segments. The protective layer has a thickness of 0.5µm to 20µm and a light transmittance of ≥50% in the 800nm ​​to 1100nm band.

5. The structure for enhancing the effect of endorsement images according to claim 1, characterized in that: The composite surface layer also includes a bearing substrate layer arranged between the structural support layer and the laser etching layer. The material of the bearing substrate layer is the same as that of the laser etching layer, the thickness is ≥50µm, and the transmittance of the bearing substrate layer in the 800nm~1100nm band is ≥50%.

6. The structure for enhancing the effect of endorsement images according to claim 1, characterized in that: A white reflective layer is provided on one side of the base layer adjacent to the laser etching layer. The material of the reflective layer is the same as that of the laser etching layer. The thickness of the reflective layer is ≥50µm, and its reflectivity in the 800nm~1100nm band is ≥70%, and its transmittance is ≤10%.

7. An anti-counterfeiting card made of a structure for enhancing the effect of endorsement images according to claims 1 to 6, characterized in that: The laser etching layer and the composite surface layer are symmetrically arranged on both sides of the base layer to form an anti-counterfeiting card that can be signed on both sides.

8. An anti-counterfeiting card made of a structure for enhancing the effect of endorsement images according to claims 1 to 6, characterized in that: The laser etching layer and the composite surface layer are sequentially arranged on one side of the base layer, and a base layer is arranged on the other side of the base layer. The base layer includes a tough structure of polycarbonate or PETG material to form an anti-counterfeiting card that can be signed on one side.

9. A structural endorsement method for enhancing the endorsement image effect according to claims 1 to 6, characterized in that: When laser marking is performed on the laser etching layer, the optical characteristics of the marking laser used include: an optical band of 980 nm ~ 1100 nm, and an incident light angle of -45° ~ 45°.

10. The structural endorsement method for enhancing the endorsement image effect according to claim 9, characterized in that: When the laser etching layer is laser-annotated, after the laser outputs the light source, the scanning galvanometer component deflects the light path and focuses the scene, and the focal spot is scanned on the composite structure film layer. The spot diameter is 5µm ~50µm, and images and text are printed.

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