LED Housing With Segmented Reflective Sidewalls

Solution Overview

Problem

The existing LED designs suffer from light source loss due to light being reflected back into the housing instead of being emitted, leading to reduced luminance performance and inefficient light use.

Innovation Solution

The LED features a housing with multiple reflective sidewalls at varying inclinations, allowing emitted light to be directed upwards and reducing loss by utilizing total reflection, while also allowing for better placement of the light-emitting chip and conductor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If greater inclinations are provided for the first and second sides of the housing, then light reflection is improved, but the area for locating the light-emitting chip and conductor becomes smaller

Engineering Contradiction:

Improvelight lossVSAvoidarea for locating chip and conductor

Core Design Contradiction:

Loss of energyVSArea of stationary object

Solution Approach 1:

The housing sides are divided into multiple segments with different inclinations. The first side includes a first inclined surface and a second inclined surface, while the second side includes a third inclined surface and a fourth inclined surface. This segmentation allows different regions to serve different functions: steeper inclines for light reflection and flatter inclines for component placement.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the housing are given different local qualities in terms of inclination angle. The upper portions have greater inclinations optimized for light reflection, while the lower portions have smaller inclinations that provide adequate space for locating the light-emitting chip and conductor. This local differentiation resolves the contradiction between light loss reduction and component placement area.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If smaller inclinations are provided for the first and second sides to accommodate components, then component placement becomes easier, but light reflection efficiency decreases

Engineering Contradiction:

Improvecomponent placementVSAvoidlight loss

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The housing sides are divided into multiple segments with different inclinations. The first side includes a first inclined surface and a second inclined surface, while the second side includes a third inclined surface and a fourth inclined surface. This segmentation allows different regions to serve different functions: steeper inclines for light reflection and flatter inclines for component placement.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the housing are given different local qualities in terms of inclination angle. The upper portions have greater inclinations optimized for light reflection, while the lower portions have smaller inclinations that provide adequate space for locating the light-emitting chip and conductor. This local differentiation resolves the contradiction between light loss reduction and component placement area.

Inventive Principle:

Principle #3Local quality

3Illumination intensity

If greater inclinations are provided for light reflection, then luminance performance improves, but light streams are reflected back into the housing instead of being emitted

Engineering Contradiction:

Improveluminance performanceVSAvoidlight source loss

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

Instead of using a single uniform inclination that causes light to be trapped, the invention inverts the approach by using multiple inclinations in sequence. Light streams that would normally be reflected back are instead redirected through a series of inclined surfaces at progressively different angles, ultimately directing them toward the exterior opening for emission.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The housing sides are divided into multiple segments with different inclinations. The first side includes a first inclined surface and a second inclined surface, while the second side includes a third inclined surface and a fourth inclined surface. This segmentation allows different regions to serve different functions: steeper inclines for light reflection and flatter inclines for component placement.

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 design enhances luminance performance by minimizing light loss and improving the arrangement of internal components, resulting in more efficient light emission and better light use.

Implementation Method 1

multiple reflective sidewalls at various inclinations are disposed on sides of the accommodation portion; streams of light emitted from the light-emitting chip travel in different directions through those reflective sidewalls to cause most of those streams of light to leave the accommodation portion

Methodology Applied

Scientific EffectTotal reflection: Total Internal Reflection

Data Source

PatentUS7517110B2Light emitting diode

Publication Date: 2009.04.14 ENNOSTAR CORP

AI summary

An LED including housing, lead frame in the housing, light-emitting chip, and packed colloid; pit accommodation portion being disposed in the housing to expose lead frame, and multiple reflective sidewalls at various inclinations being disposed on a side of accommodation portion; the chip being disposed on a lead frame; streams of light form the chip traveling in different directions when reflected by those sidewalls; and most of those streams of light being emitted out of the accommodation portion to promote luminance performance of the LED.