Patterned Polarizer Optical Security Decryption Without Rotation
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Solution Overview
Problem
Current optical security devices rely on polarizers that require precise positioning and rotation for decryption, limiting their versatility and security features, especially when integrated into substrates like banknotes or booklets where rotation is impractical.
Innovation Solution
An optical security system featuring a patterned anisotropic optical element and a patterned polarizer, both encrypted using the same encryption map, allowing the polarizer to be positioned and shifted relative to the element for decryption without rotation, providing additional security levels and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a polarizer is used for decryption in conventional optical security devices, then the information can be decrypted, but the polarizer requires precise positioning and rotation which limits versatility and is impractical for substrate integration
Solution Approach 1:
The patent divides the decryption function into two separate patterned elements: a patterned anisotropic optical element containing encrypted information and a patterned polarizer containing the decryption key. Both elements are integrated into the substrate, eliminating the need for rotation while maintaining decryption capability through relative positioning only.
Solution Approach 2:
The patent transitions from a single polarizer requiring two-dimensional rotation to a patterned polarizer system where decryption is achieved through relative positioning in one dimension (lateral shift). The encryption map creates corresponding patterns in both elements that align when positioned correctly, solving the rotation problem by operating in a different dimensional mode.
2Reliability
If part of the information content is shared between the optical element and the polarizer, then high security is achieved, but each design requires a different polarizer which reduces versatility
Solution Approach 1:
The patent creates a universal patterned polarizer that can decrypt multiple different information patterns. The polarizer contains a periodic encryption map pattern that can align with various information patterns through lateral shifting. This allows one polarizer design to serve multiple security applications, greatly enhancing versatility while maintaining high security through the shared key mechanism.
3Ease of operation
If conventional encryption methods are used with single position polarizers, then decryption is possible, but only one observation mode is available which limits security features
Solution Approach 1:
The patent introduces dynamic observation modes by enabling lateral shifting of the patterned polarizer relative to the patterned anisotropic element. This creates multiple decryption positions (e.g., first position for positive image, second position for negative image), transforming a static single-mode system into a dynamic multi-mode system that offers varied observation perspectives for enhanced security verification.
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
Enables secure decryption and decoding of information with enhanced flexibility, allowing the same polarizer to decrypt different information patterns and offering both positive and negative image appearances by shifting the polarizer, suitable for applications where rotation is not feasible.
Implementation Method 1
an optical element with anisotropic optical properties having information encoded and encrypted in an orientation pattern
Implementation Method 2
optical element with patterned anisotropic optical property
Implementation Method 3
a patterned polarizer which can be arranged in a first and in a second position on the same side of the optical element such that in both positions the information incorporated in the optical element can be decrypted and decoded
Data Source
Figure 1a~1b
Figure 2a~2d
Figure 2e~2i
AI summary
The invention relates to an optical security system comprising an optical element with a patterned anisotropic optical property, wherein information is encoded and encrypted in the pattern of the optical element. The system further comprises a patterned polarizer in which the pattern is such that the information stored in the optical element can be decrypted.