Vehicle Holographic Light Guide Layout to Block Zero-Order Dazzle
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Solution Overview
Problem
Existing holographic lighting devices for vehicles face challenges in achieving a compact construction while effectively suppressing the zero order of illumination light, which can cause viewer dazzle and disrupt the holographic lighting function, particularly in limited installation spaces such as motorcycles.
Innovation Solution
The illumination device employs a light guide body with input and output coupling surfaces arranged at specific angles to ensure total internal reflection of undiffracted light, incorporating holographic structures on the output coupling surface to diffract light while preventing zero-order light from exiting, thus maintaining optical quality and safety without a bulky design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a holographic lighting device is designed to be compact, then the installation space is reduced, but it becomes difficult to effectively suppress the zero order of illumination light which causes viewer dazzle
Solution Approach 1:
A light guide body is introduced as an intermediary component between the illumination source and the hologram. This light guide body redirects the zero order light (undiffracted light that would cause dazzle) away from the viewer's line of sight, while allowing the diffracted holographic light to pass through. This mediator enables compact design by eliminating the need for large-distance separation between components.
Solution Approach 2:
The zero order light is extracted and separated from the main light path using the light guide body. By directing this harmful component (zero order light) into a separate path that does not reach the viewer, the system eliminates the dazzle problem without requiring bulky suppression structures.
2Illumination intensity
If the distance between light source and hologram is increased to achieve better collimation, then the approximation to point light source improves, but the device size increases and compactness is lost
Solution Approach 1:
The mechanical approach of increasing physical distance for collimation is replaced with an optical system using the light guide body. The light guide body uses total internal reflection and refraction to achieve collimation and direction control without requiring large physical separation, substituting optical mechanisms for mechanical spacing.
Solution Approach 2:
Instead of achieving collimation through one-dimensional distance extension, the light guide body uses multi-dimensional optical path manipulation including refraction, reflection, and directional control at different angles to achieve the same collimation effect in a compact three-dimensional space.
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 compact, high-quality holographic lighting system that enhances visibility and safety by preventing viewer dazzle, ensuring effective diffraction of light while maintaining a compact form factor suitable for vehicles like motorcycles.
Implementation Method 1
illumination of a holographic structure of the illumination channel to generate a holographic lighting function
Implementation Method 2
output coupling surface is arranged in a beam path of light rays of the illumination light input-coupled into the light guide body for illumination of the output coupling surface at an angle greater than a critical angle of the total internal reflection
Data Source
AI summary
The invention relates to a lighting device for a vehicle having at least one lighting channel for generating a holographic light function assigned to this lighting channel by lighting a holographic structure of the lighting channel. Each channel includes a lighting assembly and a coupling-in surface of a light guide body disposed along a main beam direction of the lighting assembly. The lighting device also includes a holographic structure disposed on the coupling-out surface of the light guide body. The coupling-out surface is disposed in a beam path of the coupled-in light beams, so that lighting of the coupling-out surface takes place at an angle which is greater than a critical angle of the total reflection. The invention also relates to a rear light for a vehicle and to a vehicle.