Vehicle Lighting Device Using Holographic Waveguide Substrate
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Solution Overview
Problem
Existing vehicle lighting devices with holographic features require significant installation space due to the need for large optical components and waveguides, limiting design flexibility and efficiency.
Innovation Solution
A lighting device incorporating a secondary hologram system with a waveguide substrate, coupling-in, and coupling-out holograms that allows for compact illumination of a primary hologram, enabling efficient use of space and variable decoupling efficiency, along with spectral filtering capabilities, allowing for different lighting functions and signatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional free-beam optics and optical components are used to illuminate holograms, then the lighting device can achieve the desired luminous signature, but the installation space required becomes comparatively large
Solution Approach 1:
The patent embeds the illumination optics directly within the holographic element structure. The waveguide substrate contains embedded optical elements that guide and shape light internally, eliminating the need for separate external optical components. This nesting approach allows the illumination system to be integrated within the hologram assembly, dramatically reducing the overall installation space while maintaining effective hologram illumination
Solution Approach 2:
The patent combines the holographic element and illumination system into a single integrated assembly. The waveguide substrate serves dual functions as both the structural base for the hologram and the optical medium for light guidance. By merging these previously separate components, the design eliminates the space required for distinct optical housings and mounting structures
2Volume of moving object
If a waveguide substrate with input and output holograms is used to compact the illumination system, then the installation space is reduced, but the device complexity increases due to multiple hologram layers and coupling mechanisms
Solution Approach 1:
The waveguide substrate performs multiple functions simultaneously: it serves as the structural support for the holographic elements, as the optical medium for light guidance, and as the platform for both input and output coupling holograms. This multi-functionality reduces the need for additional separate components, thereby managing complexity while achieving compact integration
Solution Approach 2:
The illumination system is segmented into distinct functional zones within the waveguide: an input hologram region for light coupling in, a waveguide core for light transmission, and an output hologram region for light coupling out. This segmentation allows each component to be optimized independently while maintaining overall system compactness, making the complex structure more manageable and manufacturable
3Area of stationary object
If the output hologram couples light out over a large area to illuminate the primary hologram, then the illumination coverage is improved, but the coupling efficiency varies spatially
Solution Approach 1:
The output hologram is designed with spatially varying coupling characteristics. Different regions of the output hologram have optimized coupling efficiencies tailored to the local illumination requirements. This allows the system to maintain high overall coupling efficiency while still achieving broad illumination coverage, as each local region contributes optimally to the total light output
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
This solution enables the creation of compact, versatile lighting devices that can produce various luminous signatures with reduced space requirements, supporting multiple lighting functions and efficient illumination of large areas while utilizing broadband light sources without additional filters.
Implementation Method 1
an input hologram for coupling light from a light source into the waveguide substrate
Implementation Method 2
a waveguide substrate
Implementation Method 3
an output hologram for coupling light out of the waveguide substrate as the illumination light
Implementation Method 4
a primary hologram for generating a luminous function in response to illumination with illumination light
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4D
AI summary
The invention relates to a lighting device for motor vehicles. Said lighting device comprises a primary hologram (11) for providing a lighting function when the primary hologram (11) is illuminated with illumination light (14). The illumination light (14) is directed towards the primary hologram (11) via a secondary hologram system (12) which comprises a coupling-in hologram, a waveguide substrate and a coupling-out hologram.