Optical Unit With Horizontally Diffusing Portion For Headlamp Glare Reduction
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Solution Overview
Problem
Existing optical units for vehicle headlamps face issues with creating a natural light distribution pattern, increasing maximum luminous intensity, and reducing glare, particularly due to the overlap of condensed and diffused light distribution patterns which can result in a salient boundary and potential glare from adjacent light emitting modules.
Innovation Solution
Incorporating a projection lens with a horizontally diffusing portion to diffuse the second light distribution pattern mainly in the right-left direction, and an optical member that deflects the second light's optical path away from the rotary reflector to overlap with the first light distribution pattern, along with a condenser lens and expanding lens portions to control light paths and reduce glare by preventing direct entry into adjacent lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a condenser lens with multiple lens portions is used to increase the illumination region, then the light distribution pattern covers a larger area, but light from one light emitting module may enter adjacent lens portions causing glare
Solution Approach 1:
The condenser lens is divided into multiple lens portions, each corresponding to a specific light emitting module. This segmentation allows independent control of light paths from each module, preventing light from one module from entering adjacent lens portions and causing glare, while still achieving comprehensive coverage of the illumination region.
Solution Approach 2:
Each lens portion is optimized with specific local optical properties to control the light distribution from its corresponding light emitting module. This local optimization ensures that light is directed precisely where needed without spilling into adjacent regions, eliminating glare while maintaining large illumination coverage.
2Area of stationary object
If condensed and diffused light distribution patterns are combined to form high-beam pattern, then the illumination region size increases, but the boundary between patterns becomes salient
Solution Approach 1:
A horizontally diffusing portion is introduced as an intermediary element between the condensed and diffused light distribution patterns. This intermediary component gradually transitions the light distribution characteristics, blending the two patterns together and eliminating the salient boundary while preserving the expanded illumination region.
3Device complexity
If the second light source is disposed to enter the projection lens without reflection, then the optical path is simplified, but the light distribution pattern may not properly overlap with the first light distribution pattern
Solution Approach 1:
The second light source is positioned in a different spatial dimension and orientation relative to the projection lens, allowing its light to enter the lens from a different angle and form a distribution pattern that properly overlaps with the first light distribution pattern. This dimensional arrangement achieves pattern overlap without requiring complex reflective optical paths.
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 enhances the naturalness of the light distribution pattern, increases the luminous intensity, and reduces glare by diffusing the light distribution patterns differently and controlling light paths, resulting in a more uniform and effective illumination.
Implementation Method 1
a horizontally diffusing portion formed in a portion of the projection lens, and the horizontally diffusing portion diffuses the second light mainly in the right-left direction
Implementation Method 2
a rotary reflector that rotates about an axis of rotation while reflecting first light emitted from the first light source
Implementation Method 3
a projection lens that projects the first light reflected by the rotary reflector into a light illuminating direction of the optical unit
Data Source
AI summary
An optical unit includes a first light source, a second light source, a rotary reflector that rotates about an axis of rotation while reflecting first light emitted from the first light source, and a projection lens that projects the first light reflected by the rotary reflector into a light illuminating direction of the optical unit to form a first light distribution pattern. The second light source is disposed such that second light emitted from the second light source enters the projection lens without being reflected by the rotary reflector. The projection lens is configured to project the second light into the light illuminating direction of the optical unit to form a second light distribution pattern such that the second light distribution pattern overlaps an end portion of the first light distribution pattern in a right-left direction.