Optical Laminate Structure With Switched Hologram and Grating Authentication
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Solution Overview
Problem
Existing security documents lack sufficient security measures, particularly in light diffractable holograms and optically variable effects, making them vulnerable to forgery and authenticity verification difficult.
Innovation Solution
A laminate structure comprising a base material with embedded optical elements, including a hologram and diffraction grating, where the hologram image is visible under normal lighting and the diffraction grating is visible under intense lighting, providing a switching mechanism for authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light diffractable hologram is used in security documents, then optical variable effects are provided, but security is insufficient and forgery is possible
Solution Approach 1:
The optical element is divided into multiple functional layers: a hologram layer for normal viewing and a diffraction grating layer for verification viewing. This segmentation allows each layer to perform its specific function independently, enhancing security through multiple optical effects while maintaining manageable structural complexity
Solution Approach 2:
The diffraction grating structure is embedded within the hologram layer, with the grating lines formed by varying the thickness of the hologram layer itself. This nesting approach integrates multiple optical functions into a single unified structure, providing enhanced security without proportionally increasing overall structural complexity
2Measurement precision
If multiple optical layers are combined to enhance security, then authentication capability is improved, but difficulty in detecting and measuring increases
Solution Approach 1:
The optical element utilizes dynamic optical effects where the hologram displays different images depending on the viewing angle and lighting conditions. The diffraction grating similarly varies its appearance based on incident light angle, providing multiple verification states that enhance authentication accuracy while remaining observable with simple visual inspection
Solution Approach 2:
The diffraction grating is designed to exhibit color variations when illuminated, with different wavelengths being diffracted at different angles. This color-changing property provides a visually distinct verification mechanism that enhances authentication accuracy while being easily detectable through simple visual observation or basic color analysis
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
Enhances security by making it difficult for unauthorized individuals to recognize the diffraction grating, thereby preventing forgery and allowing easy authenticity verification through lighting state changes.
Implementation Method 1
a light diffractable hologram
Implementation Method 2
diffraction grating having a large number of grating lines
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
Provided are an optical element, a laminate body, and a book form having improved security. The optical element 40 is equipped with a hologram layer 41 on which a hologram image 41b is recorded, and a diffraction grating layer 50 laminated under the hologram layer 41. The diffraction grating layer 50 is equipped with a diffraction grating 52a having recesses and protrusions in the thickness direction. In addition, a card 1 is equipped with this optical element 40.