Vehicle Lighting Device With PCB-Mounted Light Shielding

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing vehicle lamp designs suffer from stray light rays that do not meet legal light distribution requirements due to inadequate control, causing glare and poor heat dissipation, with integrated light shielding in the heat sink being inefficient.

Innovation Solution

Employing a light shielding electronic element on the printed circuit board to block stray light rays, allowing the light source to be positioned further from the edge, thereby improving heat dissipation and blocking precision.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a light shielding part is formed integrally on a heat sink, then stray light rays can be blocked, but the light source must be located close to the edge part of the printed circuit board resulting in poor heat dissipation performance

Engineering Contradiction:

Improvestray light rays blockingVSAvoidheat dissipation performance

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The light shielding function is separated from the heat sink structure and implemented as an independent electronic element on the printed circuit board. This segmentation allows the light source to be positioned away from the board edge for better heat dissipation while the separate shielding element provides the required light blocking function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

An electronic element serves as an intermediary component between the light source and the lens, blocking stray light rays without requiring the light source to be positioned near the board edge. This intermediary element enables both good heat dissipation and effective light control.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If the light source is located close to the edge part of the printed circuit board to be close to the light shield, then light blocking can be achieved, but heat dissipation performance deteriorates

Engineering Contradiction:

Improvelight blocking precisionVSAvoidheat dissipation performance

Core Design Contradiction:

Manufacturing precisionVSTemperature

Solution Approach 1:

By separating the light shielding function into an independent electronic element, the light source can be positioned optimally for heat dissipation while the shielding element provides precise light blocking without being constrained by board edge positioning requirements.

Inventive Principle:

Principle #1Segmentation

3Object-affected harmful factors

If a light shielding part is formed integrally on a heat sink, then light blocking is provided, but the weight of the heat sink increases

Engineering Contradiction:

Improvestray light rays blockingVSAvoidheat sink weight

Core Design Contradiction:

Object-affected harmful factorsVSWeight of stationary object

Solution Approach 1:

The light shielding function is extracted from the heat sink structure and implemented as a separate electronic element on the printed circuit board. This extraction reduces the heat sink weight while maintaining the light blocking capability through the separate shielding element.

Inventive Principle:

Principle #2Taking out (Extraction)

4Object-affected harmful factors

If a light shielding part is formed integrally on a heat sink, then light blocking is achieved, but production cost increases

Engineering Contradiction:

Improvestray light rays blockingVSAvoidproduction cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The light shielding function is merged with the printed circuit board assembly by mounting the shielding electronic element directly on the board. This integration eliminates the need for a separate light shielding part on the heat sink, simplifying manufacturing and reducing production costs.

Inventive Principle:

Principle #5Merging (Combining)

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

Enhances heat dissipation performance, improves light ray blocking precision, reduces heat sink weight, and lowers production costs while meeting legal light distribution standards.

Implementation Method 1

at least one light shielding electronic element is also mounted on the printed circuit board, for blocking at least a portion of light rays emitted by the light source towards the lens

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Implementation Method 2

at least a portion of light rays emitted by the light source towards the optical face are guided by the optical face and then emerge through the lens

Methodology Applied

Scientific EffectLight guidance: Reflection

Data Source

PatentUS12435852B2Lighting device and motor vehicle

Publication Date: 2025.10.07 VALEO VISION SA

AI summary

The present invention provides a lighting device including a light source, a printed circuit board, an optical face and a lens, with the light source being mounted on the printed circuit board, and at least a portion of light rays emitted by the light source towards the optical face are guided by the optical face and then emerge through the lens. At least one light shielding electronic element is also mounted on the printed circuit board, for blocking at least a portion of light rays emitted by the light source towards the lens, to prevent this portion of light rays from emerging through the lens directly.