Headlamp Shield Light Guide Diffusion
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Solution Overview
Problem
Conventional vehicle headlamps with shields between reflectors and aspherical lenses suffer from non-uniform light emission due to intentional dark parts, which can lower usability and fail to comply with light intensity regulations, affecting driver visibility and safety.
Innovation Solution
A shield design with a first shield part, a reflection part, and a dark part improvement element, including a light guide and additional shields, is introduced to diffuse light and control the light emission area, ensuring even illumination and compliance with regulations by optimizing the shield's geometry and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a protrusion is formed on the shield surface to create an intentional dark part, then light concentration is prevented and regulation compliance is achieved, but light emission becomes non-uniform and usability is lowered
Solution Approach 1:
The patent introduces a light guide as an intermediary element between the shield and the dark part generation area. The light guide receives light from the LED source and redirects it to illuminate the dark part area, thereby mediating between the need for dark parts (regulation compliance) and uniform light emission (usability). This resolves the contradiction by adding a light-redistributing component that fills the dark areas without removing the shield structure needed for regulation compliance.
2Illumination intensity
If light is blocked by the shield to create dark parts, then light intensity regulation is satisfied, but driver visibility and driving stability are reduced
Solution Approach 1:
The patent applies local quality by creating a non-uniform shield structure with varying transparency or blocking characteristics in different regions. The shield selectively blocks light in specific areas to create dark parts where needed for regulation compliance, while allowing light transmission in other areas to maintain visibility. This localized differentiation resolves the contradiction between light intensity control and driving stability by ensuring that dark parts are created only where necessary without compromising overall visibility.
3Object-affected harmful factors
If the shield blocks light emission to areas above the reference horizon, then glare to other drivers is prevented, but visibility of road signs in those areas is reduced
Solution Approach 1:
The patent segments the shield into multiple regions with different light-blocking characteristics. The upper portion of the shield blocks light emission to areas above the reference horizon to prevent glare, while the lower portion or specific localized areas allow light transmission to illuminate road signs. This segmentation resolves the contradiction by dividing the shield's function into distinct zones that simultaneously achieve glare prevention and road sign visibility.
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 improved shield design enhances driver visibility by distributing light more evenly, reducing glare and improving driving stability while adhering to light intensity regulations, thus optimizing the light emission area for better road sign recognition and reduced light pollution.
Implementation Method 1
a dark part improvement element configured to diffuse light to a predetermined generation area of the dark part in the light emission area
Implementation Method 2
a reflection part including a reflecting surface in contact with one end of the first shield part while having a predetermined angle with the shield surface
Data Source
AI summary
A projection headlamp is provided including a shield disposed between the reflector and aspherical lens of the lamp to control light emission area of the headlamp. The projection headlamp includes a dark part improvement element configured to optimize a shield design to add some light to the dark part or advance light blocked for providing the dark part to a far-field part. This dark part improvement is advantageous for driving, thereby improving a driver's driving stability.