Vehicle Front Lamp Light Source Unit Heat Sink Design
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Solution Overview
Problem
Conventional vehicle front lamps using LED modules are prone to increased size and weight due to long heat sinks, suffer from blurry cut-off lines leading to undesired beam patterns, and experience heat interference between LED modules, which affects light output, and the drive circuit is inefficiently cooled within a hermetically sealed environment.
Innovation Solution
A compact light source unit design featuring a heat sink with a concave portion and a reflector with a through-hole, a light-blocking component to form desired beam patterns, and a circuit cover with ventilation holes to enhance heat dissipation and reduce module interference, allowing for efficient cooling and weight reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a large heat sink is provided to dissipate heat from LED modules, then heat dissipation effectiveness is improved, but the size and weight of the vehicle front lamp increase
Solution Approach 1:
The reflector is positioned inside the concave portion of the heat sink, with the light source arrangement portion passing through a through-hole in the reflector. This nested configuration allows the heat sink to accommodate the reflector and light source modules within its structure, reducing the overall size and weight while maintaining effective heat dissipation surface area
Solution Approach 2:
The heat sink features a concave portion that extends inward, creating a three-dimensional structure that increases heat dissipation surface area without proportionally increasing external dimensions. This allows effective heat dissipation while keeping the overall size and weight reduced
2Volume of moving object
If LED modules are arranged close together to reduce size, then compactness is improved, but heat interference between modules increases affecting light output
Solution Approach 1:
The concave portion of the heat sink creates localized thermal management zones around each light source module. The reflector positioned within the concave portion reflects light while the heat sink structure provides localized heat dissipation pathways, allowing modules to be arranged closely without heat interference affecting light output
3Reliability
If the drive circuit is enclosed in a hermetically sealed environment, then protection is improved, but heat dissipation from the drive circuit becomes inefficient
Solution Approach 1:
The circuit cover acts as an intermediary component that provides hermetic sealing for the drive circuit while incorporating ventilation holes that allow heat to escape. This mediator structure reconciles the conflicting requirements of protection and heat dissipation by providing both functions simultaneously
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 results in a shorter, lighter, and more efficient vehicle front lamp with improved beam patterns and extended LED module lifespan by effectively dissipating heat and minimizing module interference, while also ensuring efficient cooling of the drive circuit within the sealed environment.
Implementation Method 1
a heat sink (40) including a light source arrangement portion (41) on which the light source module (10, 20) is arranged
Implementation Method 2
effectively dissipating heat and minimizing module interference
Implementation Method 3
a reflector (30) which reflects light emitted from the light source module (10, 20)
Implementation Method 4
a light-blocking component (50) that blocks light emitted from the light source module (10, 20) and reflected off the reflector (30)
Implementation Method 5
a circuit cover (80) with ventilation holes to enhance heat dissipation and reduce module interference
Data Source
AI summary
A light source unit includes a light source module, a heat sink including a light source arrangement portion on which the light source module is arranged and a plurality of heat dissipation fins that are plate-shaped and arranged in a first direction such that main surfaces thereof face each other, a drive circuit for controlling driving of the light source module, and a circuit cover configured to cover the drive circuit. The light source arrangement portion is provided on an anterior surface side of the heat sink, the plurality of heat dissipation fins are provided on a posterior surface side of the heat sink, and the circuit cover is attached to the heat sink such that at least two ventilation holes are present in a spatial region framed by a part of the heat sink that is on the posterior surface side and the circuit cover.