Vehicle Headlamp Diaphragm Shaft Groove Design
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Solution Overview
Problem
Vehicle headlight diaphragm shafts with grooves fail to adequately address undesired scattered light issues, particularly in shielded light distributions, leading to glare or legally impermissible light values.
Innovation Solution
The diaphragm shaft features grooves that are separated by sharp edges, with the front plane of each groove extending at a greater angle to the lateral surface than the rear plane, capturing and redirecting scattered light back into the headlight, and having a black, light-absorbing surface to further reduce unwanted radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a diaphragm shaft with grooves is used to reduce scattered light, then scattered light is reduced to some extent, but the problem of scattered light in shielded light distributions cannot be satisfactorily resolved
Solution Approach 1:
The lateral surface of the diaphragm shaft is segmented into multiple grooves that extend along the axial direction. These grooves divide the surface into distinct segments that collectively block scattered light paths while maintaining the structural integrity of the diaphragm shaft.
Solution Approach 2:
The grooves are strategically positioned and dimensioned to provide localized light blocking properties where scattered light occurs. The grooves have specific depths and spacing that are optimized for their local function of intercepting scattered light rays without affecting the overall optical performance of the headlight system.
2Ease of manufacture
If grooves are spaced apart on the diaphragm shaft, then manufacturing is simplified, but unwanted scattered radiation cannot be sufficiently reduced
Solution Approach 1:
The grooves are designed to extend beyond what would be minimally required, with their lengths and spacing providing excessive coverage of scattered light paths. This ensures that even with simplified manufacturing and spacing, the grooves collectively intercept all relevant scattered light rays, achieving sufficient light blocking without requiring complex precision manufacturing.
3Measurement precision
If the diaphragm shaft is positioned precisely to achieve sharp HD line, then light distribution accuracy is improved, but positioning complexity and cost increase
Solution Approach 1:
The grooves on the diaphragm shaft are designed to automatically compensate for positioning variations. The distributed groove pattern ensures that scattered light is blocked across a range of positions, allowing the system to maintain acceptable performance without requiring precise active positioning control. The structure itself provides the positioning tolerance.
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 significantly reduces or eliminates undesired scattered light, allowing for legal light values in shielded light distributions without the need for precise positioning of the diaphragm shaft, thereby enhancing the optical performance and reducing manufacturing complexity.
Implementation Method 1
The ribs 'capture' light that reaches the aperture shaft from too steeply above and scatters it back into the headlight
Implementation Method 2
Furthermore, the shaft can have a black, light-absorbing surface, as a result of which the scattered light can be further reduced
Data Source
Figure 1~2
Figure 3a~3c
Figure 4a~4c
AI summary
The headlamp has a diaphragm shaft comprising a cover surface, which comprises a focal line for rotary positions. The cover surface of the diaphragm shaft comprises grooves (30-35) at a region of the focal line for dimmed light. The grooves run parallel to a rotation axis of the diaphragm shaft. The adjacent grooves are directly limited together in a rotation direction and/or a circumferential direction. The adjacent grooves are separated from each other by common point edges (40-45). The grooves completely penetrate a focal line section, which run in an inclined manner.