Parallax Holographic Security Device with Depth Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current security devices for articles of value, such as banknotes, rely on complex designs that are difficult for counterfeiters to replicate but are also challenging for the public to authenticate without training, and they suffer from issues like image blur under non-ideal lighting conditions.
Innovation Solution
A security device featuring a surface relief microstructure that exhibits parallax movement between holographic image elements, with a minimum inter-planar separation of 6 mm and a viewing angle of approximately 40 degrees, allowing for easy verification while maintaining complexity for counterfeiters, and incorporating discrete angularly spaced subsidiary viewing zones to reduce blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex designs are used in security devices, then the difficulty for counterfeiters to produce convincing counterfeits increases, but the effort and inspection required for public verification increases
Solution Approach 1:
The holographic image is segmented into multiple distinct image elements positioned at different depths (at least 6mm separation). This creates discrete visual components that are easy to identify and verify, transforming a complex continuous hologram into segmented, recognizable elements that public can easily distinguish without specialized training.
Solution Approach 2:
The invention adds the depth dimension to holographic image elements, positioning them at different distances from the surface (with minimum 6mm separation). This three-dimensional arrangement creates parallax movement when the device is tilted, providing a simple visual verification method where elements move relative to each other, making authentication intuitive for the public while maintaining high counterfeit resistance.
2Ease of operation
If holographic image elements are positioned at greater depth, then the parallax movement effect increases for easier verification, but image blur increases under non-ideal lighting conditions
Solution Approach 1:
The invention optimizes the depth parameter by establishing a minimum separation of 6mm between image elements and positioning them within a specific depth range. This parameter optimization ensures sufficient parallax movement for easy verification while maintaining image clarity under various lighting conditions, resolving the trade-off between movement effect and image quality.
3Reliability
If multiple holographic image elements at different depths are used, then the device becomes more difficult to counterfeit, but the device complexity increases
Solution Approach 1:
The hologram is segmented into multiple discrete image elements at different depths, each contributing to counterfeit resistance. This segmentation approach maintains relatively simple individual elements while creating complex overall structure that is difficult to replicate, balancing device complexity with security effectiveness.
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 simple and effective authentication method that remains resistant to counterfeiting, with clear recognition of symbols under various lighting conditions, ensuring the device's authenticity is easily verified by the public without the need for training.
Implementation Method 1
surface relief microstructure which, in response to incident radiation, replays a hologram
Implementation Method 2
the first holographic image element exhibits apparent movement relative to the further image, the rate of movement being at least 6 mm per radian of tilt
Data Source
AI summary
A security device including a surface relief microstructure which, in response to incident radiation, replays a hologram viewable within a viewing zone, the hologram including at least a first holographic image element in an image plane spaced from the surface of the microstructure. The device exhibits at least one further image in a plane spaced from the image plane of the first holographic element. On tilting the device, the first holographic image element exhibits apparent movement relative to the further image, which when expressed in radians, a rate of parallax movement per radian equals the spacing between phones and the product of the rate of movement and the included angle of the viewing zone defining a distance at least 20% of the dimension of the device in the direction of movement of the first holographic image element.