Security Hologram Exposure Layout for 3D Viewing Angles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing three-dimensional holograms as security elements are complex and limited in providing a three-dimensional impression with different views from various angles.
Innovation Solution
A method involving the holographic exposure of monoscopic images from different directions onto a recording material, ensuring exposure directions form a standard convergence angle for human viewing, allowing the human brain to reconstruct a three-dimensional object by perceiving images with each eye, resulting in a multiplex volume reflection hologram with enhanced depth perception and versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional contact printing process is used to produce holograms, then production complexity is reduced, but three-dimensional perception capability is lost
Solution Approach 1:
The patent segments the holographic recording process into multiple sequential exposures, each capturing a monoscopic image from a different detection direction. By dividing the three-dimensional object into multiple two-dimensional views and exposing them separately onto the recording material, the system achieves three-dimensional perception capability while maintaining a relatively simple contact printing production process.
2Adaptability or versatility
If multiple monoscopic images are exposed from different directions, then three-dimensional perception is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent systematically varies the detection direction parameter when exposing multiple monoscopic images onto the recording material. By controlling and changing the angular parameters of exposure directions while maintaining standard convergence angles, the system achieves three-dimensional perception without requiring excessive manufacturing precision, as each exposure is deliberately designed with specific angular relationships.
3Ease of operation
If standard convergence angle is used for all exposures, then human viewing comfort is improved, but viewing angle range is limited
Solution Approach 1:
The patent extends the viewing experience by adding the time dimension through sequential exposures from multiple detection directions. While each individual exposure uses standard convergence angles for comfort, the combination of multiple exposures at different angular positions creates an expanded viewing angle range, allowing observers to perceive the three-dimensional object from various viewpoints by moving their position relative to the hologram.
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 the mass production of individually distinct security holograms with high spatial depth and a wide range of viewing angles, offering a three-dimensional perception from different directions, suitable for security documents and items.
Implementation Method 1
generating coherent laser radiation and splitting the laser radiation into a reference component and at least one object component, and guiding the reference component and the at least one object component such that the reference component and the at least one object component illuminate the recording material from opposite sides and interfere within the recording material
Implementation Method 2
a method for producing a security hologram... into which several, at least three, monoscopic images of the same three-dimensional object are exposed
Implementation Method 3
providing holographic recording material; generating coherent laser radiation and splitting the laser radiation into a reference component and at least one object component
Implementation Method 4
The exposure directions all lying in one plane and, at least in pairs, enclosing a standard convergence angle for human viewing. This means that during reconstruction, individual monoscopic reconstructed images are reconstructed in reconstruction directions that correspond to the exposure directions but are oriented in opposite directions. The reconstruction directions corresponding to the exposure directions are chosen such that... that a human observer, under at least one viewing geometry, perceives one of the two reconstructed images with one eye and the other with the other eye, so that the human brain reconstructs a three-dimensional object from this.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a method for producing a security hologram (201) and a security hologram (201) produced in this way. The method comprises the steps of: providing several, at least three, monoscopic images (12-x) of a three-dimensional object (5) from different detection directions (12-x), wherein each of the several images (12-x) is assigned to exactly one of the different detection directions (12-x); providing a holographic recording material (200); generating coherent light (120) and splitting the coherent light (120) into at least one reference component (150; 150-x) and at least one object component (140; 140-x); and leading the at least one reference share (150; 150-x) and the at least one object share (140; 140-x), such that the at least one object share (140'; 140-x) and the at least one reference share (150;150-x) irradiate the recording material (200) from opposite sides and interfere within the recording material (200), wherein the multiple images (12-x) are projected under different exposure directions (210-x) with respect to the recording material (200), each of the multiple images (12-x) being assigned exactly one of the different exposure directions (210-x), characterized in that the exposure directions (210-x) all lie in one plane and at least pairwise enclose a standard convergence angle (α) for human viewing, so that a stereoscopic effect is perceptible to a human observer.;