Vehicle Light Emitting Module Ceramic Board Electrode Design

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Solution Overview

Problem

In light emitting modules for vehicles, the planar electrode portions on the radiating board can cause short circuits due to contact with the radiating member, especially when moisture or foreign substances are present, leading to increased risk of electrical failure.

Innovation Solution

The planar electrode portions on the ceramic board are designed with exposure regions positioned away from the abutting surface, and non-exposure regions are formed by covering parts with an insulating layer, preventing contact with the radiating member and facilitating design for feeding terminal placement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the planar electrode portion is formed on the whole of both ends in the orthogonal direction to the abutting direction of the radiating member, then the electrical connection is improved, but the risk of short circuit increases due to contact with the radiating member

Engineering Contradiction:

Improveelectrical connectionVSAvoidshort circuit risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating the planar electrode portion into exposure regions and non-exposure regions. The non-exposure regions are positioned away from the abutting surface to prevent contact with the radiating member, while the exposure regions maintain electrical connection functionality. This spatial differentiation resolves the contradiction between ensuring electrical connection and preventing short circuits.

Inventive Principle:

Principle #3Local quality

2Volume of moving object

If the planar electrode portion is positioned near the abutting surface for compact design, then the device size is reduced, but the risk of moisture-induced short circuit increases

Engineering Contradiction:

Improvedevice sizeVSAvoidmoisture-induced short circuit

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an insulating layer as an intermediary between the planar electrode portion and the radiating member in the non-exposure regions. This insulating layer prevents direct contact and blocks moisture pathways, thereby eliminating the short circuit risk while allowing the electrode to be positioned in a compact arrangement near the abutting surface.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If the planar electrode portion is fully exposed for easy manufacturing, then the manufacturing process is simplified, but the short circuit prevention capability is reduced

Engineering Contradiction:

Improveelectrode formationVSAvoidshort circuit prevention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent segments the planar electrode portion into exposure regions and non-exposure regions. The exposure regions remain fully exposed for easy manufacturing and electrical connection, while the non-exposure regions are covered with insulating layers to prevent short circuits. This segmentation allows the manufacturing process to remain simple while ensuring reliability through selective coverage.

Inventive Principle:

Principle #1Segmentation

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 effectively prevents short circuits during assembly and operation, ensuring reliable electrical connections and reducing the risk of moisture-induced failures, while allowing for easier design and manufacturing by separating the electrode regions.

Implementation Method 1

another surface in the vertical direction formed as a radiating surface, which is provided in face contact with the radiating member to radiate heat

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS8016469B2Light emitting module and lighting device for vehicle

Publication Date: 2011.09.13 KOITO MFG CO LTD

AI summary

A ceramic board is formed in an almost rectangular shape and has one side surface of an outer peripheral surface formed as an abutting surface, which is caused to abut on positioning surfaces of a radiating member, and one surface in a vertical direction formed as a device disposing surface on which a semiconductor light emitting device is to be disposed. Predetermined conductive patterns are formed on the ceramic board. A light emitting portion has a semiconductor light emitting device. A pair of positive and negative planar electrode portions are formed on the ceramic board and connected to the semiconductor light emitting device through the conductive patterns. At least a part of the pair of planar electrode portions are set to be exposure regions exposed to the device disposing surface of the ceramic board and the exposure regions are positioned in portions other than a portion linked to the abutting surface in an outer peripheral portion of the device disposing surface.