Vehicle Headlamp Light Distribution Member for LED Low-Beam
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Solution Overview
Problem
Existing vehicle-mounted headlamps using LEDs struggle to effectively utilize light emitted by LEDs for forming a low-beam lamp light distribution, leading to inefficiencies and leakage of light.
Innovation Solution
A vehicle-mounted headlamp design featuring an LED with its light emitting surface positioned above the optical axis, a projector lens, and a light distribution member with specific incident and reflecting surfaces that guide light emitted by the LED to form a low-beam lamp distribution, ensuring effective use of light while preventing illumination of oncoming vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a first reflecting surface is provided on the optical axis to form low-beam lamp light distribution, then the light distribution for low-beam lamp is formed, but the reflected light travels toward the second reflecting surface and is reflected repeatedly between the two reflecting surfaces causing light attenuation
Solution Approach 1:
The light distribution member is divided into multiple functional surfaces: a first reflecting surface for forming low-beam distribution, and separate second and third reflecting surfaces for capturing upward and downward emitted light respectively. This segmentation prevents light from being reflected repeatedly between two surfaces, thereby reducing light attenuation while maintaining the low-beam light distribution function.
Solution Approach 2:
The light distribution member acts as an intermediary optical component between the LED and the projector lens. It includes a first incident surface, first reflecting surface, second incident surface, third incident surface, and exit surface that work together to redirect light from multiple directions into the projector lens, preventing light loss while maintaining proper light distribution.
2Use of energy by moving object
If light emitted downward from the LED is reflected by the first reflecting surface, then the light is redirected, but the light leaks out and cannot be used effectively
Solution Approach 1:
Different regions of the light distribution member are assigned different functions: the first reflecting surface handles frontward emitted light, the second reflecting surface captures upward emitted light, and the third reflecting surface captures downward emitted light. This local specialization ensures that light in each direction is properly redirected, preventing leakage and improving overall light utilization efficiency.
Solution Approach 2:
The solution extends the light capture from a single plane to multiple spatial dimensions by adding the second incident surface and third incident surface that capture light emitted in upward and downward directions respectively. This multi-dimensional approach ensures comprehensive light collection and redirection, preventing light leakage while maintaining effective light utilization.
3Productivity
If the light emitting surface of the LED is positioned on the upper side of the optical axis with a gap, then light emitted over a wide range can be utilized, but the device complexity increases
Solution Approach 1:
The light distribution member is designed as a multi-functional optical component that simultaneously performs multiple functions: it includes incident surfaces for light entry, reflecting surfaces for light redirection in multiple directions, and an exit surface for light output. This integration of multiple functions into a single component achieves wide-range light utilization while avoiding the need for multiple separate optical elements, thereby controlling device complexity.
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 enables efficient use of LED light over a wide range, forming a low-beam lamp distribution that is effective in illuminating the road while avoiding glare for oncoming drivers, allowing for a compact and low-power headlamp with reduced heat radiation components.
Implementation Method 1
a projector lens that projects light emitted by the LED frontward
Implementation Method 2
a first reflecting surface disposed on the optical axis such that light emitted frontward by the LED enters through the first incident surface
Implementation Method 3
a second incident surface and a second reflecting surface disposed on the upper side of the optical axis such that light emitted upward by the LED enters through the second incident surface and the light entering through the second incident surface is reflected frontward by the second reflecting surface
Implementation Method 4
a third incident surface and a third reflecting surface disposed on the upper side of the optical axis such that light emitted downward by the LED enters through the third incident surface and the light entering through the third incident surface is reflected frontward by the third reflecting surface
Data Source
AI summary
A vehicle-mounted headlamp using an LED includes a projector lens projecting the LED light to the vehicle front. A light distribution member forming a low-beam lamp light distribution includes: a first incident surface through which the LED light emitted frontward enters; a first reflecting surface disposed on an optical axis such that a projector lens side edge overlaps an LED side focus of the projector lens; a second incident surface and a second reflecting surface disposed on an upper side of the optical axis such that the LED light emitted upward enters through the second incident surface and is reflected frontward by the second reflecting surface; and a third incident surface and a third reflecting surface disposed on the upper side of the optical axis such that the LED light emitted downward enters through the third incident surface and is reflected frontward by the third reflecting surface.