Curved Surface Hologram Production via Material Bending

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Solution Overview

Problem

Current methods for producing holograms on curved surfaces require complex and expensive systems to account for varying reference beam angles, making them unsuitable for high-volume series production.

Innovation Solution

A process and device that bends a flat photosensitive recording material to match the desired geometry, allowing hologram projection without complex systems, using rollers or spheres to adjust the material's curvature, and employing a light source with adjustable illumination to accommodate different geometries.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If complex systems with reference beams at different angles are used to produce holograms on curved surfaces, then the hologram geometry accuracy is improved, but the device complexity and production cost increase

Engineering Contradiction:

Improvehologram geometry accuracyVSAvoidsystem complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Instead of changing the reference beam angles to match curved surfaces, the patent inverts the approach by keeping the reference beam angle fixed and changing the carrier surface geometry. The carrier is formed with a curvature that corresponds to the desired hologram application surface, allowing the hologram to be recorded in the correct geometry from the beginning using a simple reference beam configuration.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the geometric parameter of the carrier surface itself rather than changing optical parameters like reference beam angles. By pre-forming the carrier with the appropriate curvature and using it during hologram recording, the system achieves accurate curved surface holograms without complex optical systems.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If complex systems with reference beams at different angles are used to produce holograms on curved surfaces, then the hologram geometry accuracy is improved, but the productivity decreases

Engineering Contradiction:

Improvehologram geometry accuracyVSAvoidproduction volume

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent inverts the conventional approach by keeping the reference beam configuration simple and fixed, and instead pre-forming the carrier surface to match the desired hologram geometry. This allows for straightforward, repeatable production processes suitable for high-volume manufacturing while maintaining accurate curved surface holograms.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The carrier surface is pre-formed with the appropriate curvature and geometry before the hologram recording process. This preliminary preparation of the carrier enables subsequent high-volume production runs to proceed efficiently without requiring complex real-time adjustments during each hologram production cycle.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If fixed reference beam angle systems are used, then the device complexity is reduced, but the adaptability to different hologram geometries decreases

Engineering Contradiction:

Improvesystem simplicityVSAvoidhologram geometry flexibility

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent introduces flexibility through the carrier design rather than through complex optical systems. The carrier can be manufactured in different geometries and curvatures to match different hologram application requirements, allowing a simple fixed-angle system to produce diverse hologram types by simply changing the carrier template.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The simple fixed-reference-beam system becomes universal through the use of interchangeable carriers with different geometries. Each carrier can be designed for a specific application, allowing the same basic optical system to produce various hologram geometries including flat, curved, and specialized surfaces.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 production of holograms on curved surfaces without complex systems, facilitating high-volume series production and versatility in creating various hologram geometries, reducing costs and simplifying the process.

Implementation Method 1

a flat, photosensitive recording material is bent and the hologram is projected into the curved recording material

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Implementation Method 2

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS12153378B2Process and device for producing a hologram, hologram and illumination device for a vehicle

Publication Date: 2024.11.26 HELLA GMBH & CO KGAA

AI summary

A process is provided for producing a hologram that can be applied in particular to a curved carrier, characterized by the process steps of bending a flat, photosensitive recording material and projecting the hologram into the curved recording material.