CN112505936A - Color anti-counterfeiting printed matter - Google Patents

Color anti-counterfeiting printed matter Download PDF

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Publication number
CN112505936A
CN112505936A CN202110122449.5A CN202110122449A CN112505936A CN 112505936 A CN112505936 A CN 112505936A CN 202110122449 A CN202110122449 A CN 202110122449A CN 112505936 A CN112505936 A CN 112505936A
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China
Prior art keywords
polarization grating
polarization
printing layer
grating
images
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Granted
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CN202110122449.5A
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Chinese (zh)
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CN112505936B (en
Inventor
吕国皎
郑骊
赵百川
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Chengdu Technological University CDTU
Chengdu Univeristy of Technology
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Chengdu Technological University CDTU
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Marketing (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Printing Methods (AREA)
  • Polarising Elements (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

The invention provides a colorful anti-counterfeiting printed matter. The color anti-counterfeiting printed matter consists of a printing layer, 1/4 wave plates and a polarization grating, wherein the polarization grating, 1/4 wave plates and the printing layer are sequentially arranged in front of and behind the printing layer; a color composite image formed by combining a plurality of frames of images is printed on the printing layer; in the color composite image, pixels from images of different frames are periodically arranged in columns; the polarization grating is made of a polaroid and is provided with a light-transmitting slit; 1/4 wave plate is placed between the polarization grating and the printing layer, and the optical axis direction of the wave plate forms an included angle of 45 degrees with the polarization detection direction of the polarization grating; and when the position of the polarized light source moves, the polarized light source can sequentially irradiate different pixel columns on the color synthetic image through the grating slit, thereby sequentially displaying the images of the frames and realizing dynamic display.

Description

Color anti-counterfeiting printed matter
Technical Field
The invention relates to a grating display technology, in particular to a color anti-counterfeiting printed matter.
Background
Typically, images can be printed on paper and used for static display. The invention provides a colorful anti-counterfeiting printed matter, which can realize dynamic display of a printed image through a special optical structure, thereby being used for product anti-counterfeiting.
Disclosure of Invention
The invention provides a colorful anti-counterfeiting printed matter. FIG. 1 is a schematic diagram of the color anti-counterfeiting printed matter. The color anti-counterfeiting printed matter consists of a printing layer, 1/4 wave plates and a polarization grating, wherein the polarization grating, 1/4 wave plates and the printing layer are sequentially arranged in front of and behind.
The printing layer is printed with a color composite image formed by combining a plurality of frames of images. In a color composite image, pixels from images of different frames are arranged periodically in columns. Referring to fig. 1, xyz respectively constitute orthogonal coordinate systems, and pixel rows of images from different frames are periodically arranged in the x direction.
The polarization grating is made of a polarizing plate on which a light-transmitting slit is provided.
1/4 wave plate is placed between the polarization grating and the printing layer, and the optical axis direction of the wave plate forms an included angle of 45 degrees with the polarization detection direction of the polarization grating.
Referring to fig. 2, light with any polarization direction orthogonal to the polarization detection direction of the polarizer of the polarization grating can only be incident from the grating slit position. The incident light is converted into circularly polarized light after passing through the 1/4 wave plate, the circularly polarized light continuously propagates to the printing layer and illuminates the printing layer, after being reflected by the printing layer, the circularly polarized light passes through the 1/4 wave plate again and is converted into linearly polarized light, the polarization direction of the linearly polarized light is the same as the polarization detection direction of the polarizing plate of the polarization grating, and therefore the linearly polarized light can pass through the polarizing plate of the polarization grating and can be projected to all directions in space.
Further, referring to fig. 3, a polarized light source is disposed under the condition of low ambient light intensity, the polarization direction of the light emitted by the polarized light source is orthogonal to the polarization analyzing direction of the polarizer of the polarization grating, and the light source brightness is higher than the ambient light intensity. When the position of the polarized light source is moved in the direction of the arrangement of the pixel columns, that is, when it is moved in the x direction, it can be sequentially irradiated to different pixel columns on the color composite image through the slits on the polarization grating, thereby sequentially displaying the images of the frames. The sequential display of the images of these frames may ultimately enable a dynamic display.
Further, since the brightness of the polarized light source is higher than the intensity of the ambient light, the ambient light has less interference to image display formation.
Further, the distance from the polarized light source to the polarization grating is set asd 2Distance of polarizing grating to printed layerIs separated intod 1The slit pitch of the polarization grating isp 2The pitch of the pixel columns of the image belonging to the same frame on the printed layer isp 1Then the above parameters satisfy: (d 1+ d 2) ×p 2= p 1×d 2。
Alternatively, the slits on the polarization grating may be replaced by an array of through holes.
Alternatively, in the color composite image, pixels from images of different frames are periodically arranged in two dimensions.
In the invention, the images of each frame can be sequentially displayed by moving the position of the polarized light source, so that dynamic display can be finally realized. Different from the traditional printed matter, the invention can be applied to product anti-counterfeiting because the displayed image is changeable.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram of the wave plate according to the present invention for modulating polarization direction.
Fig. 3 is a schematic diagram of the principle of the present invention.
Icon: 010-color anti-counterfeit printed matter; 110-polarization grating; 120-1/4 wave plates; 130-a print layer; 131-first frame image pixel columns; 132-second frame image pixel columns; 133-third frame image pixel columns; 134-fourth frame image pixel column; 200-polarized light source.
It should be understood that the above-described figures are merely schematic and are not drawn to scale.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the terms "first", "second", and the like are used for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Example 1
Fig. 1 is a schematic structural diagram of a color anti-counterfeit printed matter 010 provided in this embodiment. The color anti-counterfeiting printed matter 010 consists of a printing layer 130, an 1/4 wave plate 120 and a polarization grating 110, wherein the polarization grating 110, the 1/4 wave plate 120 and the printing layer 130 are sequentially arranged in front of and behind.
The printing layer 130 is printed with a color composite image in which a plurality of frames of images are combined. In a color composite image, pixels from images of different frames are arranged periodically in columns. Referring to FIG. 3, pixel columns 131-134 from different frames of images are arranged periodically in the x-direction.
Referring to fig. 3, the polarization grating 110 is made of a polarizer, and has light-transmitting slits arranged in the x-direction, and the arrangement direction of the slits is the same as the arrangement direction of the pixel rows 131 to 134 on the color composite image.
Referring to fig. 2, the 1/4 wave plate 120 is disposed between the polarization grating 110 and the printed layer 130, and the optical axis direction of the wave plate forms an angle of 45 degrees with the polarization analyzing direction of the polarizer of the polarization grating.
Referring to fig. 2, light with an arbitrary polarization direction orthogonal to the polarization detection direction of the polarizer of the polarization grating 110 can be incident only from the grating slit position. The incident light passes through the 1/4 wave plate 120 and is converted into circularly polarized light, the circularly polarized light continues to propagate to the printing layer 130 and illuminates the printing layer, and after being reflected by the printing layer 130, the circularly polarized light passes through the 1/4 wave plate 120 again and is converted into linearly polarized light, the polarization direction of the linearly polarized light is the same as the polarization detection direction of the polarizer of the polarization grating 110, and therefore the linearly polarized light can pass through the polarizer of the polarization grating 110 and is projected to all directions in space.
Referring to fig. 3, a polarized light source 200 is disposed under the condition of low ambient light intensity, the polarization direction of the light emitted by the polarized light source 200 is orthogonal to the polarization analyzing direction of the polarizer of the polarization grating 110, and the light source brightness is higher than the ambient light intensity. When the position of the polarized light source 200 is moved in the direction opposite to x, it can sequentially illuminate different pixel columns on the color composite image through the slits on the polarization grating 110, thereby sequentially displaying the images of the frames. Specifically, the first time may be irradiated to the first frame image column 131, the second time may be irradiated to the second frame image column 132, the third time may be irradiated to the third frame image column 133, and the fourth time may be irradiated to the fourth frame image column 134. Therefore, the sequential display of the images of these frames can eventually achieve a dynamic display.
Further, the distance from the polarized light source 200 to the polarization grating 110 is setd 250 mm, distance from the polarization grating 110 to the printed layer 130d 11 mm, slit pitch of the polarization grating 110p 20.254 mm, the pitch of the pixel columns of the image belonging to the same frame on the print layer 130p 10.25908 mm, the above parameters satisfy: (d 1+ d 2) ×p 2= p 1×d 2。
In the present invention, since the images of the respective frames can be sequentially displayed by moving the position of the polarized light source 200, the dynamic display can be finally realized. Different from the traditional printed matter, the invention can be applied to product anti-counterfeiting because the displayed image is changeable.

Claims (4)

1. A color anti-counterfeiting printed matter is characterized in that: the color anti-counterfeiting printed matter consists of a printing layer, 1/4 wave plates and a polarization grating, wherein the polarization grating, 1/4 wave plates and the printing layer are sequentially arranged in front of and behind the printing layer; a color composite image formed by combining a plurality of frames of images is printed on the printing layer; in the color composite image, pixels from images of different frames are periodically arranged in columns; the polarization grating is made of a polaroid and is provided with a light-transmitting slit; 1/4 wave plate is placed between the polarization grating and the printing layer, and the optical axis direction of the wave plate forms an included angle of 45 degrees with the polarization detection direction of the polarization grating; light rays with any polarization direction orthogonal to the polarization detection direction of the polarizer of the polarization grating can only be incident from the grating slit position.
2. A colour security print as claimed in claim 1, wherein: distance from polarized light source to polarization gratingd 2Distance of polarization grating to printed layerd 1Slit pitch of polarization gratingp 2Pitch of pixel columns belonging to the same frame of image on the printed layerp 1And satisfies the following conditions: (d 1+ d 2) ×p 2= p 1×d 2。
3. A colour security print as claimed in claim 1, wherein: the slits on the polarization grating may be replaced by an array of through holes.
4. A colour security print as claimed in claim 1, wherein: in the color composite image, pixels from images of different frames are periodically arranged two-dimensionally.
CN202110122449.5A 2021-01-29 2021-01-29 Color anti-counterfeiting printed matter Active CN112505936B (en)

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Application Number Priority Date Filing Date Title
CN202110122449.5A CN112505936B (en) 2021-01-29 2021-01-29 Color anti-counterfeiting printed matter

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Application Number Priority Date Filing Date Title
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CN112505936B CN112505936B (en) 2021-04-27

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Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1960882A (en) * 2004-04-17 2007-05-09 雷恩哈德库兹两合公司 Film comprising a polymer layer
US20070127024A1 (en) * 2005-12-01 2007-06-07 Hiroshi Nomura Polarization evaluation mask, polarization evaluation method, and polarization determination device
JP2008203738A (en) * 2007-02-22 2008-09-04 Dainippon Printing Co Ltd Medium for determining authenticity, article having the same, label, transfer sheet and transfer foil for the same
JP2011131527A (en) * 2009-12-25 2011-07-07 Toppan Printing Co Ltd Forgery preventive medium, and forgery preventive label, printed matter and transfer foil using the forgery preventive medium, and method for determining authenticity of forgery preventive medium
CN202748301U (en) * 2012-07-20 2013-02-20 西北工业大学 Multiband polarization imaging anti-counterfeiting element identification system
JP2013233733A (en) * 2012-05-09 2013-11-21 Toppan Printing Co Ltd Medium, sticker and transfer foil for preventing forgery and verification method
CN104040387A (en) * 2012-01-03 2014-09-10 3M创新有限公司 Effective media retarder films with spatially selective birefringence reduction
CN105339179A (en) * 2013-02-12 2016-02-17 赛克达戈有限公司 Security device
CN105431301A (en) * 2013-06-26 2016-03-23 国家造币印钞厂-皇家造币厂 Method of providing a security document with a security feature, and security document
CN109085745A (en) * 2018-08-13 2018-12-25 中国科学院上海光学精密机械研究所 The incoherent correlated digital holographic apparatus of single-shot Fresnel based on polarization orientation planar lens
CN209707821U (en) * 2019-04-17 2019-11-29 成都工业学院 A kind of time-multiplexed transparent stereo display device
CN110767105A (en) * 2018-07-27 2020-02-07 京东方科技集团股份有限公司 Display module and display device
CN110969955A (en) * 2018-09-28 2020-04-07 深圳光峰科技股份有限公司 LED display screen
CN111132852A (en) * 2017-10-20 2020-05-08 伟福夫特科技公司 Optical switching device
CN111458963A (en) * 2020-04-15 2020-07-28 四川大学 Front projection type 2D/3D mixed projection display device
CN211180437U (en) * 2020-01-11 2020-08-04 成都工业学院 Printed matter with axially-variable image display
CN111796477A (en) * 2020-08-25 2020-10-20 成都工业学院 High-resolution projection display device

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1960882A (en) * 2004-04-17 2007-05-09 雷恩哈德库兹两合公司 Film comprising a polymer layer
US20070127024A1 (en) * 2005-12-01 2007-06-07 Hiroshi Nomura Polarization evaluation mask, polarization evaluation method, and polarization determination device
JP2008203738A (en) * 2007-02-22 2008-09-04 Dainippon Printing Co Ltd Medium for determining authenticity, article having the same, label, transfer sheet and transfer foil for the same
JP2011131527A (en) * 2009-12-25 2011-07-07 Toppan Printing Co Ltd Forgery preventive medium, and forgery preventive label, printed matter and transfer foil using the forgery preventive medium, and method for determining authenticity of forgery preventive medium
CN104040387A (en) * 2012-01-03 2014-09-10 3M创新有限公司 Effective media retarder films with spatially selective birefringence reduction
JP2013233733A (en) * 2012-05-09 2013-11-21 Toppan Printing Co Ltd Medium, sticker and transfer foil for preventing forgery and verification method
CN202748301U (en) * 2012-07-20 2013-02-20 西北工业大学 Multiband polarization imaging anti-counterfeiting element identification system
CN105339179A (en) * 2013-02-12 2016-02-17 赛克达戈有限公司 Security device
CN105431301A (en) * 2013-06-26 2016-03-23 国家造币印钞厂-皇家造币厂 Method of providing a security document with a security feature, and security document
CN111132852A (en) * 2017-10-20 2020-05-08 伟福夫特科技公司 Optical switching device
CN110767105A (en) * 2018-07-27 2020-02-07 京东方科技集团股份有限公司 Display module and display device
CN109085745A (en) * 2018-08-13 2018-12-25 中国科学院上海光学精密机械研究所 The incoherent correlated digital holographic apparatus of single-shot Fresnel based on polarization orientation planar lens
CN110969955A (en) * 2018-09-28 2020-04-07 深圳光峰科技股份有限公司 LED display screen
CN209707821U (en) * 2019-04-17 2019-11-29 成都工业学院 A kind of time-multiplexed transparent stereo display device
CN211180437U (en) * 2020-01-11 2020-08-04 成都工业学院 Printed matter with axially-variable image display
CN111458963A (en) * 2020-04-15 2020-07-28 四川大学 Front projection type 2D/3D mixed projection display device
CN111796477A (en) * 2020-08-25 2020-10-20 成都工业学院 High-resolution projection display device

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