Rotating Reflector Gate Positioning for Headlamp Accuracy
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Solution Overview
Problem
Existing optical units for vehicle headlamps face issues with rotational accuracy, glare, connector reliability, assembly complexity, and symmetry in left and right optical units, due to burrs from injection molding, unintended light output, unstable connections, and asymmetrical layouts.
Innovation Solution
A method of manufacturing a rotating reflector with a blade functioning as a reflecting surface, using injection molding with a gate positioned closer to the rotating part to minimize burrs, and a lens unit with overlapping lenses for compact design, along with a linking structure for improved connector alignment and a support component with angled fixing parts for balanced rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If injection molding is used to manufacture the rotating reflector, then manufacturing efficiency is improved, but burrs are generated that disrupt rotational balance and reduce rotational accuracy
Solution Approach 1:
The patent positions the gate at the rotating part rather than the blade to deliberately direct burr formation to the rotating part. This converts the harmful effect of burrs into a beneficial outcome by ensuring they do not affect the reflective surface or blade performance, thus maintaining both manufacturing efficiency and rotational accuracy.
Solution Approach 2:
The patent applies different quality requirements to different parts: the blade requires high surface quality for light reflection, while the rotating part can tolerate burrs. By localizing the gate to the rotating part, the invention ensures high quality where needed while accepting imperfections where they do not matter.
2Manufacturing precision
If the gate is positioned at the blade for injection molding, then the blade can be fully formed, but burrs are generated on the blade that affect rotational balance and accuracy
Solution Approach 1:
The patent intentionally redirects the harmful burr formation away from the blade to the rotating part. This converts the potential harm of incomplete blade formation into a benefit by ensuring complete blade formation while accepting burrs only in the non-critical rotating part.
3Illumination intensity
If light is emitted outside the optical controller, then more light is produced, but unintended light output causes glare
Solution Approach 1:
The patent extracts and removes light that would otherwise escape outside the optical controller. By providing a reflective or absorbing structure at the peripheral portion, unintended light is captured and redirected or absorbed, eliminating glare while preserving necessary light output through the optical controller.
Solution Approach 2:
The patent introduces an intermediary structure (reflective or absorbing material) at the peripheral portion to mediate between the light source and the external environment. This intermediary captures stray light and prevents it from causing glare, while allowing controlled light to pass through the optical controller.
4Adaptability or versatility
If connectors are mounted on substrates without alignment features, then assembly is flexible, but connector alignment is poor leading to unreliable connections
Solution Approach 1:
The patent performs preliminary action by forming alignment protrusions and grooves during the substrate manufacturing process. This preliminary alignment feature preparation enables both assembly flexibility and connection reliability, as connectors can be easily guided into correct positions without complex assembly procedures.
5Adaptability or versatility
If left and right optical units have asymmetrical layouts, then each unit can be optimized for its side, but manufacturing complexity increases
Solution Approach 1:
The patent applies asymmetry principle by designing the optical units with mirrored symmetrical layouts rather than identical asymmetrical designs. This allows each side to be optimized for its specific directional requirements while maintaining manufacturing simplicity through the use of symmetrical design principles that can be produced using the same tooling and processes.
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 solution enhances rotational accuracy, reduces glare, improves connector reliability, simplifies assembly, and allows for symmetrical left and right optical units, resulting in a more efficient and balanced vehicle headlamp system.
Implementation Method 1
a rotating reflector rotated in one direction around a rotational axis while reflecting light emitted from a light source
Implementation Method 2
a projection lens for projecting the first light reflected by the rotating reflector in a direction of light irradiation of the optical unit
Data Source
AI summary
A rotating reflector is a resin rotating reflector including: a rotating part; and a blade provided around the rotating part and functioning as a reflecting surface, wherein the rotating part has a hole in which a rotary shaft is inserted.