Rotating Mirror Illumination Device for ADB Scanning Range
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Solution Overview
Problem
Current Adaptive Driving Beam (ADB) headlamps have limited scanning range for laser beams, which restricts the area of illumination and efficiency in vehicle lighting systems.
Innovation Solution
An illumination device with a rotating member featuring multiple flat mirror regions along its circumference, which reflect laser beams at different angles to expand the scanning range, combined with a wavelength conversion member to produce a wider beam projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional ADB headlamp with limited scanning range is used, then the device structure is simple, but the illumination area is restricted
Solution Approach 1:
The rotating member is divided into multiple flat mirror regions (first, second, third, and fourth mirror regions) arranged along the circumferential direction. Each mirror region reflects laser beams at different angles, enabling expanded scanning coverage. This segmentation allows the system to achieve broader illumination area by dividing the reflection function across multiple discrete mirror surfaces.
Solution Approach 2:
The mirror regions are disposed at mutually different angles with respect to lines connecting the rotation axis and the center of each mirror region. This angular arrangement in the circumferential direction creates additional scanning dimensions, allowing the laser beam to cover a wider area by reflecting off mirror regions positioned at different angular orientations around the rotation axis.
2Area of stationary object
If the scanning range is expanded using multiple mirror regions, then the illumination area increases, but the device complexity increases
Solution Approach 1:
Multiple flat mirror regions are integrated into a single rotating member structure that rotates around a common rotation axis. This merging approach allows the system to achieve expanded scanning range through one unified rotating component rather than requiring multiple separate rotating mirrors, thereby reducing overall device complexity while maintaining broad illumination coverage.
Solution Approach 2:
The rotating member serves multiple functions simultaneously: it houses multiple mirror regions for beam reflection, provides rotational movement for scanning, and acts as a unified structural element. This multi-functionality allows the single rotating member to achieve expanded scanning range without proportionally increasing device complexity.
3Area of stationary object
If laser beams are reflected at different angles to expand scanning range, then the beam coverage area increases, but the structural complexity increases
Solution Approach 1:
The mirror regions are disposed at mutually different angles with respect to the lines connecting the rotation axis and the center of each mirror region. This asymmetric angular arrangement allows each mirror region to reflect laser beams at different angles, expanding the scanning range and beam coverage area while maintaining a relatively simple rotational structure.
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 allows for a broader illumination area, enabling more effective light distribution and reduced glare, while maintaining a compact design and efficient heat dissipation.
Implementation Method 1
a rotating member including a plurality of flat mirror regions that are disposed along a circumference direction of the rotating member to sequentially reflect laser beams emitted from the first laser element
Implementation Method 2
Each of the laser beams reflected at a corresponding one of the mirror regions is incident on the wavelength conversion member
Data Source
AI summary
An illumination device includes a laser element, a rotating member including a plurality of flat mirror regions that are disposed along a circumference direction of the rotating member to sequentially reflect laser beams emitted from the first laser element with rotation of the rotating member, and a wavelength conversion member. Each of the laser beams reflected at a corresponding one of the mirror regions is incident on the wavelength conversion member. When viewed in a direction in which a rotation axis of the rotating member extends, the mirror regions are disposed at mutually different angles with respect to respective ones of lines each connecting the rotation axis and the center of a respective one of the mirror regions.