Holographic Layer Lamination for Wider-Angle Secure Optical Images
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Solution Overview
Problem
Existing optical devices forming holographic images are not satisfactory in terms of manufacturing flexibility, security, and image quality, particularly in terms of brightness and color palette, with restricted viewing angles and difficulty in observing the image due to stereoscopic vision, making them vulnerable to forgery and counterfeiting.
Innovation Solution
An optical device comprising a textured layer with first macro-textures and a holographic layer intermediate between the textured layer and a carrier, where the holographic layer is deformed by lamination to create second macro-textures, forming a personalized arrangement of pixels with modified diffractive properties, enhancing the holographic image's security and viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If holographic diffraction gratings use relatively small incident-light illumination angles to separate wavelengths, then wavelength separation is improved, but viewing angle range is restricted
Solution Approach 1:
The patent applies macro-textures to the holographic layer that modulate the diffraction pattern in a second spatial dimension. The texture pattern (e.g., array of protrusions or recesses) superimposes an additional diffraction grating structure on the base holographic grating, creating a composite diffraction effect that expands the viewing angle while maintaining wavelength separation through the interaction of both grating structures.
Solution Approach 2:
The invention combines the holographic diffraction grating with a macro-texture layer to create a composite optical structure. The macro-texture acts as an additional optical element that modifies the diffraction characteristics, allowing the system to achieve both good wavelength separation and expanded viewing angles through the synergistic effect of the two structured layers.
2Manufacturing precision
If correct illumination and observation angles are used for holographic images, then image quality is improved, but ease of operation deteriorates due to stereoscopic vision difficulties
Solution Approach 1:
The macro-texture divides the holographic layer into multiple discrete textured regions (protrusions or recesses arranged in a pattern). Each textured region acts as an independent diffraction element that contributes to the overall image. This segmentation creates multiple viewing pathways that accommodate different eye positions and angles, making it easier for observers to find the correct viewing angle despite stereoscopic vision challenges.
Solution Approach 2:
The macro-textured holographic layer dynamically adapts its diffraction pattern based on the incident light angle and observer position. As the viewing angle changes, the textured regions selectively diffract light to maintain image visibility across a broader range of angles, effectively making the viewing conditions more dynamic and accommodating rather than fixed and restrictive.
3Ease of manufacture
If lamination is used to assemble textured layer with carrier, then manufacturing flexibility is improved, but device complexity increases
Solution Approach 1:
The patent combines the macro-texture formation and holographic layer assembly into a single lamination process. The macro-textured layer is laminated directly onto the carrier containing the holographic layer, integrating multiple functions (texturing, hologram formation, and structural assembly) into one manufacturing step. This merging reduces the number of separate processing steps and simplifies the overall manufacturing workflow.
Solution Approach 2:
The macro-textured layer serves as an intermediary element between the carrier and the final holographic image. During lamination, this intermediate layer transfers its texture pattern to the holographic layer while simultaneously providing structural support and optical modulation. This intermediary approach allows for flexible manufacturing where the textured layer can be prepared separately and then integrated with the holographic layer in a single lamination operation.
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 device produces a secure, high-quality holographic image that is difficult to reproduce or falsify, with improved viewing angles and authenticatable patterns, suitable for use in security documents.
Implementation Method 1
the holographic layer comprising a diffraction grating forming, via a holographic effect, an arrangement of pixels in a basis of at least two distinct colours
Implementation Method 2
forming, via a holographic effect, an arrangement of pixels
Implementation Method 3
The first surface of the textured layer is assembled by lamination with the carrier so that the holographic layer, placed between the textured layer and the carrier, is deformed by the first macro-textures
Implementation Method 4
is deformed by the first macro-textures so as to comprise second macro-textures conformal with said first macro-textures
Data Source
AI summary
An optical device and to a corresponding manufacturing process, the device including a textured layer including, on its surface, first macro-textures; and a carrier including, on its surface, a holographic layer intermediate between the textured layer and the carrier. The holographic layer includes a diffraction grating forming, via a holographic effect, an arrangement of pixels in a basis of at least two distinct colours. The textured layer is assembled by lamination with the carrier so that the holographic layer, placed between the textured layer and the carrier, is deformed by the first macro-textures so as to include second macro-textures conformal with the first macro-textures, the visual appearance of the arrangement of pixels being personalized via the second macro-textures.