Vehicle Headlamp Rectangular LED Orientation for Light Distribution
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Solution Overview
Problem
Existing vehicle headlamps using semiconductor light emitting devices face challenges in forming light distribution patterns with high accuracy, leading to irregularities in light intensity and complexity in controlling horizontal and vertical light diffusion.
Innovation Solution
A vehicle headlamp design incorporating a focused-beam lamp unit and a diffused-beam lamp unit, each with a rectangular light emitting surface and a corresponding optical member, where the focused-beam unit forms a vertically narrow pattern and the diffused-beam unit forms a wider pattern, allowing for simplified light distribution control by adjusting the orientation and position of the light source images to minimize intensity irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If both horizontal and vertical light diffusion are controlled by optical members (reflector and projection lens) to form a diffused beam pattern, then the diffused beam pattern can be achieved, but the light distribution control becomes complex
Solution Approach 1:
The invention divides the light diffusion control into separate horizontal and vertical components. The reflector controls horizontal diffusion while the projection lens controls vertical diffusion, segmenting the complex two-dimensional control into simpler one-dimensional controls that can be independently optimized
Solution Approach 2:
The invention introduces an intermediary approach by using the rectangular light emitting surface orientation as a passive geometric element that inherently provides different diffusion characteristics in horizontal and vertical directions, reducing the need for complex active optical control
2Illumination intensity
If light source images are condensed toward a cutoff line to form a hot zone for focused beam pattern, then the focused beam pattern is achieved, but unnecessary brightness below the hot zone or strong irregularity in light intensity occurs
Solution Approach 1:
The invention applies local quality by making the light emitting surface rectangular with different side lengths in horizontal and vertical directions, creating locally optimized light distribution characteristics where the longer side provides enhanced diffusion in that direction, thereby controlling the hot zone formation and reducing intensity irregularities
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 simplified light distribution control and reduces irregularities in light intensity, allowing for a more accurate and efficient formation of low-beam light patterns with improved horizontal and vertical cutoffs.
Implementation Method 1
the semiconductor light emitting devices are light emitting chips, such as light emitting diodes (LEDs)
Implementation Method 2
a first optical member via which light from the first semiconductor light emitting device is projected forward from the focused-beam lamp unit
Data Source
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AI summary
A vehicle headlamp (11) has a focused-beam lamp unit (20), and a diffused-beam lamp unit (30). The focused-beam lamp unit has a first semiconductor light emitting device (22) having a first rectangular light emitting surface (22a), and a first optical member (21) that projects light from the first semiconductor light emitting device to form a focused beam pattern. The diffused-beam lamp unit has a second semiconductor light emitting device (32) having a second rectangular light emitting surface (32a), and a second optical member (31) that projects light from the second semiconductor light emitting device to form a diffused beam pattern, the diffused beam pattern being wider than the focused beam pattern in a direction along a vertical line in front a vehicle on which the vehicle headlamp is mounted. The focused-beam lamp unit and the diffused-beam lamp unit are arranged to form a light distribution pattern by combining the focused beam pattern and the diffused beam pattern.