Offset Parabolic Reflector Headlamp Cut Line Control
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Solution Overview
Problem
Projector-type headlamps experience sharp changes in illumination intensity near the cut line, leading to increased contrast and driver confusion due to optical axis changes, and require inefficient light-shielding patterns with high-intensity discharge bulbs, limiting adaptability to left-hand and right-hand traffic conditions.
Innovation Solution
A vehicle headlamp design incorporating a parabolic reflector offset from the projection lens, which moderates illumination intensity changes by adjusting the focal point, allowing for efficient light distribution without stripe light-shielding units and enabling easy adaptation to different traffic sides using a detachable light-shielding seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a projector-type headlamp uses a shade to block light and form a cut line, then the light distribution pattern can be controlled, but the illumination intensity changes sharply in the vicinity of the cut line, increasing contrast and potentially confusing the driver
Solution Approach 1:
The patent divides the light distribution function into two separate optical systems: a projection optical system that provides the main light distribution, and a reflection optical system with a parabolic reflector that specifically addresses the cut line region. By segmenting the functions, the reflection system can soften the illumination transition at the cut line without affecting the overall light distribution pattern.
Solution Approach 2:
The parabolic reflector acts as an intermediary optical element that receives light from the source and redirects it to fill in the sharp transition zone near the cut line. This intermediary system moderates the illumination change by adding supplementary light in the critical transition region, reducing the contrast effect.
2Power
If a high-intensity discharge bulb is used as a light source, then the light output is increased, but the light-emitting portion is relatively large with unclear outer edge, requiring stripe light-shielding patterns that deteriorate light flux efficiency
Solution Approach 1:
The patent extracts the light-shielding function from the bulb itself and relocates it to the reflection optical system. By removing the stripe light-shielding pattern requirement from the bulb, the full light flux from the high-intensity discharge bulb can be utilized without being blocked by shielding structures.
Solution Approach 2:
Instead of modifying the bulb with light-shielding patterns, the patent uses the reflection optical system to create the desired light distribution pattern by selectively reflecting and directing light. The reflection system effectively 'copies' the necessary shading function through optical path control rather than physical blocking.
3Stability of the object's composition
If a projector-type headlamp uses a fixed shade to form the cut line, then the light distribution is stable, but the headlamp cannot easily adapt to left-hand and right-hand traffic conditions
Solution Approach 1:
The patent replaces the fixed shade with a movable or adjustable light-shielding seal in the reflection optical system. This dynamic element can be repositioned or reconfigured to adapt to different traffic conditions (left-hand or right-hand traffic) while maintaining stable light distribution through controlled adjustment rather than permanent fixation.
Solution Approach 2:
The reflection optical system with an adjustable light-shielding seal serves multiple functions: it can adapt to different traffic patterns (left-hand and right-hand traffic), maintain stable light distribution when properly configured, and provide the cut line function. This multi-functional design eliminates the need for separate headlamp units for different traffic conditions.
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 design reduces sharp illumination changes near the cut line, enhances visibility, and simplifies the structure by eliminating the need for stripe light-shielding patterns, while allowing easy adaptation to various traffic conditions without compromising light flux or requiring complementary lenses.
Implementation Method 1
a reflection optical system including a parabolic reflector that is provided at a position offset from the projection lens as viewed from the front of the vehicle, and that reflects the light beam emitted from the light source and irradiates the same in front of the vehicle
Data Source
AI summary
A vehicle headlamp includes a light source; a projection optical system that includes a projection lens projecting an image, formed by a light beam emitted from the light, source, forward of the vehicle; and a reflection optical system including a parabolic reflector that is provided at a position offset from the projection lens as viewed from the front of the vehicle, and that reflects the light beam emitted from the light source and irradiates the same in front of the vehicle, wherein the reflector has a light distribution pattern irradiating a region including a cut line, and the projection optical system has a light distribution pattern irradiating downward with respect to the reflector.