Light-Emitting Element Housing for Stable Wavelength Conversion

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Solution Overview

Problem

Light-emitting apparatuses face issues with decreased optical output and unstable chromaticity due to light absorption and multiple reflections within the housing, as well as absorption by electrodes and gold wires, leading to fluctuations in excitation and emitted light intensities.

Innovation Solution

A light-emitting apparatus design featuring a housing with a sloping surface for the light-emitting element and a wavelength conversion body on a flat surface, where the lid portion includes a transparent and reflecting area to direct light efficiently towards the wavelength conversion body, preventing multiple reflections and absorption, and allowing light to pass through or be reflected to minimize losses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the housing interior is filled with wavelength conversion substance, then wavelength conversion is achieved, but light is absorbed by multiple reflection leading to decreased optical output

Engineering Contradiction:

Improvewavelength conversion capabilityVSAvoidoptical output

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The housing interior is divided into two distinct regions: a flat top surface for placing the wavelength conversion substance and sloping side surfaces for light reflection. This segmentation prevents multiple reflections within the housing by directing light efficiently toward the wavelength conversion body, thereby reducing energy loss while maintaining wavelength conversion capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the housing interior have different functions: the flat central top surface is optimized for wavelength conversion substance placement, while the sloping side surfaces are optimized for light reflection. This local quality differentiation ensures that each region contributes optimally to its specific function, minimizing overall energy loss.

Inventive Principle:

Principle #3Local quality

2Productivity

If light-emitting element is disposed on sloping inner wall, then light emission toward wavelength conversion body is achieved, but reflected light is absorbed by electrodes and gold wires leading to decreased optical output

Engineering Contradiction:

Improvelight emission efficiencyVSAvoidoptical output

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The wavelength conversion body is extracted from the housing interior and placed on the flat top surface, separating it from the light emission region. This extraction prevents absorbed light from being re-absorbed by electrodes and gold wires, as the conversion body is positioned where reflected light converges without passing through conductive elements.

Inventive Principle:

Principle #2Taking out (Extraction)

3Illumination intensity

If multiple reflection of light occurs within housing, then light distribution is achieved, but intensity of excitation light and emitted light fluctuate causing unstable chromaticity

Engineering Contradiction:

Improvelight distributionVSAvoidchromaticity stability

Core Design Contradiction:

Illumination intensityVSStability of the object's composition

Solution Approach 1:

Instead of allowing light to reflect randomly within the housing, the sloping surfaces are designed to actively direct and guide light toward the wavelength conversion body. This inversion of the reflection pattern eliminates multiple random reflections that cause intensity fluctuations, thereby stabilizing chromaticity while maintaining adequate light distribution.

Inventive Principle:

Principle #13The other way round (Inversion)

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 stabilizes the chromaticity and prevents a decrease in output power by ensuring that light is effectively directed to the wavelength conversion body, reducing absorption and maintaining consistent light intensity, thereby enhancing the overall efficiency of the light-emitting apparatus.

Implementation Method 1

a wavelength conversion body which converts a wavelength of light emitted from the light-emitting element and emits light having a converted wavelength

Methodology Applied

Scientific EffectWavelength conversion: Fluorescence

Implementation Method 2

The reflecting portion is a portion different from the transparent portion and specularly reflecting the light emitted from the light-emitting element so that the light impinges on the wavelength conversion body

Methodology Applied

Scientific EffectSpecular reflection: Reflection

Data Source

PatentUS11824325B2Light-emitting apparatus and light-emitting element housing

Publication Date: 2023.11.21 NITERRA CO LTD

AI summary

A multilayer wiring substrate includes a first wiring substrate including a plurality of stacked layers made of a thermo setting resin and having a wiring layer formed between each adjacent layer of the layers in a state in contact with the adjacent layers, a second wiring substrate made of a ceramic, and a joining layer disposed between a back surface of the first wiring substrate and a front surface of the second wiring substrate and configured to join the first wiring substrate and the second wiring substrate to each other, wherein at least a surface of the joining layer adjacent to the second wiring substrate is made of a thermo plastic resin.