Security Paper Watermark Laser Recess Optical Contrast
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Solution Overview
Problem
Conventional security papers with watermarks offer limited protection against forgery and lack visual attractiveness, failing to combine high security with visual appeal.
Innovation Solution
A security paper featuring a watermark overlaid by a recess area formed through laser radiation, creating a combination motif that appears differently in transmitted and reflected light, with adjustable brightness and design flexibility, enhancing both security and visual appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional watermarks are used for security protection, then the security paper provides basic authentication, but the protection level remains limited and visual attractiveness is reduced
Solution Approach 1:
The patent combines two security features - traditional watermarks and laser-produced recess areas - into a single integrated security element. The watermark provides the base security feature while the laser-cut recess areas overlay it to create a combination motif that appears different in transmitted versus reflected light, thereby enhancing both security and design versatility simultaneously
Solution Approach 2:
The security paper employs a composite security feature consisting of the paper substrate with embedded watermark and superimposed laser-cut recess patterns. This composite structure creates a multi-layered security element where the interaction between the watermark and recess areas produces unique optical effects that are difficult to replicate
2Ease of manufacture
If simple watermark designs are used, then the production process remains simple, but the security against forgery is limited
Solution Approach 1:
The watermark is pre-formed in the paper during the papermaking process, establishing the base security feature before any laser processing occurs. This preliminary action allows the subsequent laser-cut recess areas to be precisely positioned and integrated with the existing watermark pattern, enhancing security without requiring complete redesign of the production process
3Reliability
If complex security features are added to enhance protection, then security against forgery improves, but the visual attractiveness and design freedom are reduced
Solution Approach 1:
The patent introduces a dimensional distinction by creating recess areas that modify the paper's surface topology and light interaction. The laser-cut features create physical depth variations and edge effects that produce different optical properties when viewed in reflected light versus transmitted light, adding a dimensional aspect to the security feature that enhances protection while maintaining design flexibility
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 appealing and easily authenticable security feature that is difficult to counterfeit, offering a high degree of security and design freedom through the interaction of watermarks and laser-cut patterns.
Implementation Method 1
the recess area is formed from at least one linear recess in the security paper produced by the action of laser radiation
Data Source
Figure 1~2c
Figure 2d~3c
Figure 3d~4d
AI summary
The paper has watermarks (14) forming a pattern e.g. portrait, and overlapped by an opening region (16). The opening region forms another pattern and is formed from a linear opening in the paper so that overlapping of the watermarks and the opening region forms a combination pattern (12) of the patterns. The linear opening is produced by effect of laser radiation. The combination pattern has a visual impression changing in transmitted light relative to reflected light. The watermarks include a thin place with a paper thickness reduced relative to surrounding. An independent claim is also included for a method for producing a security paper.