Vehicle Headlight Projector Reflector Dual Illuminator Design
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Solution Overview
Problem
Existing vehicle headlights with passing beams and cutoff lines struggle to provide early detection of pedestrians or obstacles beside the driving lane, as the light distribution above the cutoff line is restricted, leading to reduced visibility compared to high beams.
Innovation Solution
A vehicle headlight design incorporating a projector unit for a main light distribution pattern with a cutoff line and a reflector unit for a secondary light distribution pattern that extends above the cutoff line in a predetermined horizontal angle, enhancing visibility by overlapping and extending light coverage beyond the projector's range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cutoff line is provided in the passing beam to prevent glare to oncoming drivers, then compliance with regulations and prevention of glare is improved, but visibility of pedestrians beside the driving lane deteriorates
Solution Approach 1:
The headlight system is divided into two independent illuminators: a first illuminator (projector unit) that produces the main light distribution pattern with a cutoff line to prevent glare, and a second illuminator (reflector unit) that produces a supplementary light distribution pattern extending above the cutoff line. This segmentation allows each unit to perform its specific function without interfering with the other, resolving the contradiction between glare prevention and pedestrian visibility.
Solution Approach 2:
The second illuminator provides enhanced illumination specifically in the region above the cutoff line and outside the predetermined horizontal angle from the elbow point, where pedestrians beside the driving lane are located. This localized supplementation of light intensity in the critical detection zone improves visibility without requiring the entire beam pattern to exceed regulatory limits.
2Reliability
If light distribution above the cutoff line is restricted for the passing beam, then regulation compliance is improved, but early detection capability deteriorates
Solution Approach 1:
The detection function is segmented between two illuminators: the first illuminator maintains regulation compliance by restricting light above the cutoff line in the central viewing angle, while the second illuminator independently provides extended illumination above the cutoff line in the peripheral zones (outside predetermined horizontal angle from elbow point) where early pedestrian detection is critical.
Solution Approach 2:
The second illuminator provides preliminary illumination in the region above the cutoff line before the vehicle reaches a distance where pedestrians would otherwise be undetectable. This advanced illumination in the extended region allows pedestrians to be detected earlier than would be possible with the first illuminator alone, while the first illuminator maintains regulatory compliance.
3Device complexity
If a single illuminator with cutoff line is used, then device simplicity is improved, but light coverage extension capability deteriorates
Solution Approach 1:
The headlight system merges two different optical systems (projector unit and reflector unit) into a single integrated illuminator assembly. The projector unit and reflector unit are positioned and configured to produce overlapping light distribution patterns, creating an extended combined coverage area that exceeds what either unit could achieve alone, while maintaining a unified headlight structure.
Solution Approach 2:
The second illuminator extends the light coverage in the vertical dimension by illuminating regions above the cutoff line, while the first illuminator maintains the horizontal cutoff line structure. This dimensional extension allows the system to increase effective light coverage area without proportionally increasing device complexity, as the extension is achieved through spatial arrangement and optical design rather than adding multiple separate headlight assemblies.
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 design allows for early detection of pedestrians or obstacles beside the driving lane while maintaining compliance with regulations by providing additional light coverage above the cutoff line, improving visibility without increasing the number of headlight components.
Implementation Method 1
a first illuminator that has a projector unit including a projection optical system and illuminates a predetermined region ahead of a vehicle with a first light distribution pattern having a cutoff line at an upper end
Implementation Method 2
a second illuminator that has a reflector unit including a reflective optical system and illuminates, with a second light distribution pattern that partially overlaps with the first light distribution pattern, a region extended further toward an upper side than the first light distribution pattern
Data Source
AI summary
A vehicle headlight includes: a first illuminator that including a projector unit having a projection optical system and illuminates a predetermined region ahead of a vehicle with a first light distribution pattern having a cutoff line at an upper end; and a second illuminator that includes a reflector unit having a reflective optical system and illuminates, with a second light distribution pattern that partially overlaps with the first light distribution pattern, a region extended further toward an upper side than the first light distribution pattern in a range outside a predetermined horizontal angle from an elbow point of the cutoff line.