Anti-Counterfeiting Pattern With Curved Lithographic Lines
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Solution Overview
Problem
Existing optically variable anti-counterfeiting patterns require precise observation angles and lack dynamic, continuous optical effects when rotated, making them unsuitable for quick identification and prone to forgery.
Innovation Solution
A dynamic optically variable anti-counterfeiting pattern is created by combining lithographic lines with gravure blind embossed relief lines of varying widths and curvatures, printed on a carrier, allowing for continuous optical effects when rotated, achieved through lithography and precise overprinting techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If offset line printing is disposed on the blind embossed side part, then oblique effect is generated, but optically color changing visual angle is narrow
Solution Approach 1:
The patent applies curved lithographic lines with continuously changing curvature (from 0.01-0.02 mm−1 to 1-2 mm−1) instead of straight or simple geometric patterns. This curvature variation creates a broader and more continuous optically variable effect when the pattern is rotated, resolving the contradiction between manufacturing simplicity and optical versatility.
Solution Approach 2:
The patent creates a dynamic optically variable effect by combining lithographic lines with varying widths (200-500 μm to 20-50 μm) and curvatures with gravure blind embossed relief lines. When rotated, this combination produces continuous optical changes rather than static oblique effects, expanding the visual angle and dynamic characteristics.
2Reliability
If parallel lines are used for invisible anti-counterfeiting pattern, then dynamically variable engraving gravure is generated, but accurate overprinting with other graphic pattern is not achieved
Solution Approach 1:
The patent segments the pattern into two distinct components: lithographic lines (curved lines with varying widths) and gravure blind embossed relief lines. This segmentation allows each component to be optimized independently - the lithographic lines provide the dynamic optical effect while the gravure lines provide the relief structure, enabling both dynamic variability and accurate overprinting.
Solution Approach 2:
The patent combines two different printing technologies (lithography and gravure blind embossing) into a composite anti-counterfeiting pattern. The lithographic lines provide the optically variable effect while the gravure relief lines provide the tactile and visual structure, creating a composite pattern that achieves both dynamic effects and manufacturing precision.
3Measurement precision
If engraving gravure is overprinted with offset printing accurate design, then gray level or optically variable effect is generated, but no dynamic effect is produced
Solution Approach 1:
The patent introduces dynamic characteristics by using curved lithographic lines with continuously varying width and curvature, combined with gravure blind embossed relief lines. When the pattern is rotated, this configuration produces continuous optical changes and dynamic effects, transforming the static gray level effect into a dynamic optically variable effect.
Solution Approach 2:
The patent varies key parameters of the lithographic lines including width (from 200-500 μm to 20-50 μm) and curvature (from 0.01-0.02 mm−1 to 1-2 mm−1) along the length of the lines. These parameter changes create the dynamic optically variable effect when the pattern is rotated, while maintaining precise alignment with the gravure relief lines.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a visually identifiable, difficult-to-forgery pattern with continuous optical changes upon rotation, enhancing security and ease of verification.
Implementation Method 1
a continuously variable optical effect is generated when the whole area is rotated along with view angles
Implementation Method 2
The engraving gravure blind embossed relief lines are combined with the lithographic lines, such that a continuously variable optical effect is generated
Data Source
AI summary
An anti-counterfeiting pattern having an optically variable structure, comprising lithographic lines and gravure blind embossed relief lines printed on a carrier. The lithographic lines are a set of lithographic curve lines having a curvature, the widths of the lithographic curve lines changing from thick to thin, or thin to thick. The gravure blind embossed relief lines are a set of curve lines corresponding to the lithographic lines, and having the same curvature. The relief lines are overprinted on the lithographic lines with a width variation identical to that of said lithographic lines. Accurate overprinting of the two printing types forms a curved relief structure wherein the width of the lines changes continuously. When a printed product is rotated and observed, a continuously variable optical effect will be seen, which is visual, readily to identify, anti-copying and difficult to forgery.