Laser Headlamp Optical System Linear Phosphor Conversion
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Solution Overview
Problem
Conventional laser optical systems for head lamps suffer from high light loss and increased weight due to the use of a reflective body, leading to reduced optical efficiency, limited design freedom, and higher manufacturing costs.
Innovation Solution
A laser optical system that eliminates the reflective body by directing the laser beam from a laser diode to a phosphor film, which then outputs white light directly to an aspheric lens, accompanied by a reflective film with a film hole and a silver-colored reflection coating to enhance optical efficiency and reduce system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a reflective body is used to direct white light to the front area, then the light can be redirected to illuminate the road, but light loss occurs at the reflective body surface and the system size and weight increase
Solution Approach 1:
The patent removes the reflective body from the optical system entirely. Instead of using a reflective body to redirect light, the design employs a direct optical path where the laser diode, phosphor converter, and aspheric lens are arranged linearly to guide light forward without reflection, thereby eliminating light loss at reflective surfaces and reducing system complexity
Solution Approach 2:
The patent integrates multiple optical functions into a compact linear arrangement. The laser diode, phosphor film, and aspheric lens are positioned in sequence along the optical axis, merging the light generation, wavelength conversion, and beam shaping functions into a unified compact structure that eliminates the need for separate reflective components
2Illumination intensity
If a reflective body is used to output white light to the front area, then the light can be directed to the road, but the overall size of the optical system becomes large
Solution Approach 1:
The patent transitions from a multi-dimensional reflective optical path to a linear one-dimensional arrangement. By positioning the laser diode, phosphor film, and aspheric lens along a straight optical axis, the design achieves efficient light direction in a compact linear footprint, reducing the overall volume required for the optical system while maintaining illumination performance
3Ease of operation
If a reflective body is used in the optical system, then light can be redirected, but the weight of the optical system becomes heavy
Solution Approach 1:
The patent removes the heavy reflective body component from the optical system. By eliminating this substantial component and replacing it with a lightweight linear optical arrangement using laser diode and aspheric lens, the design achieves light direction control with significantly reduced weight while maintaining operational effectiveness
4Illumination intensity
If a reflective body is used to implement the optical system, then light can be reflected to the front area, but the manufacturing cost increases
Solution Approach 1:
The patent eliminates the reflective body component, thereby removing the associated manufacturing costs for producing, finishing, and installing reflective surfaces. The simplified linear optical system requires fewer precision-manufactured components, reducing overall manufacturing complexity and cost while maintaining white light emission performance
Solution Approach 2:
The patent changes the optical design parameters from a reflective configuration to a direct transmission configuration. This parameter change eliminates the need for precision reflective surfaces and complex alignment procedures, simplifying the manufacturing process and reducing costs while achieving the same light direction function
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 configuration minimizes light loss, reduces system weight, lowers manufacturing costs, and enhances design flexibility by improving optical efficiency and allowing for more compact and cost-effective designs.
Implementation Method 1
a phosphor film formed in a film shape to react on the laser beam that passes through the reflective film to output white light
Implementation Method 2
an aspheric lens configured to direct the white light that permeates the phosphor film to a front area
Implementation Method 3
a reflective film having a film hole formed thereon to pass the laser beam that is diffused through the pattern film
Data Source
AI summary
A laser optical system for a head lamp may include a laser diode, a pattern film having a surface on which a micro pattern is formed to diffuse a laser beam emitted from the laser diode and to specify a width and a height of the beam in accordance with a desired form, a reflective film having a film hole formed thereon to pass the laser beam that is diffused through the pattern film, a phosphor film formed in a film shape to react on the laser beam that passes through the reflective film to output white light, and an aspheric lens configured to direct the white light that permeates the phosphor film to a front area. The laser diode and the aspheric lens, and/or other components in between, may be arranged in a line.