Holographic Optical Device for Laser Headlight Light Shaping
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Solution Overview
Problem
Conventional laser-based vehicle headlight systems require costly and bulky optical elements like aspheric lenses, scattering devices, and mixing rods for focusing and intensity distribution, limiting miniaturization and increasing alignment complexity.
Innovation Solution
A compact laser lighting module utilizing a holographic optical device to transform and focus laser light onto a light conversion device, eliminating the need for separate focusing elements by acting as both a collimating lens and light shaping unit, thereby reducing size and alignment efforts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional aspheric lenses and multiple optical elements are used for focusing and intensity distribution, then the desired light distribution is achieved, but the device size increases and alignment complexity increases
Solution Approach 1:
The patent combines multiple optical functions (focusing and intensity distribution) into a single holographic optical element. This element simultaneously performs the work of separate aspheric lenses, scattering devices, and mixing rods, thereby reducing the number of components and simplifying alignment while maintaining the desired light distribution characteristics
Solution Approach 2:
The holographic optical element is designed to perform multiple optical functions simultaneously - acting as both a focusing element and an intensity distribution controller. This multi-functional approach eliminates the need for separate specialized optical components, reducing overall device complexity
2Illumination intensity
If traditional aspheric lenses and multiple optical elements are used for focusing and intensity distribution, then the desired light distribution is achieved, but the device size increases
Solution Approach 1:
The patent combines multiple optical functions (focusing and intensity distribution) into a single holographic optical element. This element simultaneously performs the work of separate aspheric lenses, scattering devices, and mixing rods, thereby reducing the number of components and simplifying alignment while maintaining the desired light distribution characteristics
Solution Approach 2:
The holographic optical element integrates multiple optical functionalities within a single compact structure, effectively nesting the functions of multiple traditional optical components into one unified element, thereby reducing the overall volume required
3Illumination intensity
If separate optical elements are used for focusing and light shaping, then the desired intensity distribution is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple optical functions (focusing and intensity distribution) into a single holographic optical element. This element simultaneously performs the work of separate aspheric lenses, scattering devices, and mixing rods, thereby reducing the number of components and simplifying alignment while maintaining the desired light distribution characteristics
Solution Approach 2:
The holographic optical element can be manufactured using holographic recording techniques that allow for precise replication of complex optical patterns. This copying approach enables mass production of the integrated element at lower costs compared to manufacturing and assembling multiple precision optical components
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 holographic optical device enables a compact and efficient laser lighting module with a tailored light distribution, achieving a more compact design and simplified alignment compared to conventional systems, while maintaining the desired intensity and wavelength conversion for vehicle headlights.
Implementation Method 1
The holographic optical device may, for example, be a volume grating diffracting the laser light such that the intended focusing and light distribution of the (blue) laser light is enabled on the light converter
Implementation Method 2
the light converter is adapted to convert the first transformed laser light to converted light, wherein a peak emission wavelength of the converted light is in a longer wavelength range than a laser peak emission wavelength of the first transformed laser light
Data Source
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AI summary
The invention describes a laser lighting module (105) for a vehicle headlight comprising a laser (110) for emitting laser light (10), a light conversion device (130), and a holographic optical device (120) for transforming part of the laser light (10) to first transformed laser light (11) and focusing that on the light conversion device (130) for converting the first transformed laser light (11) to converted light (20). The holographic optical device (120) is transparent to the converted light (20), and transforms another part of the laser light (10) to second transformed laser light (12) which is mixed with the converted light (20) after the latter has been transmitted through the holographic optical device (120). The invention further describes a vehicle headlight comprising at least one such laser lighting module (105).