LED Lamp Thermal Management via Integrated Board and Diffusive Lenses

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

LED lighting systems require effective heat dissipation and uniform light distribution without the need for a separate heat sink, while maintaining a compact form factor suitable for replacing traditional incandescent or fluorescent lighting.

Innovation Solution

An optically transmissive enclosure with a thermally dissipative LED board that integrates heat dissipation and light diffusion, using a PCB or MCPCB with thermally conductive materials and diffusive lenses to dissipate heat and create a uniform omnidirectional light pattern, eliminating the need for a separate heat sink.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a separate heat sink is added to dissipate heat from LEDs, then heat dissipation effectiveness is improved, but device complexity and volume increase

Engineering Contradiction:

Improveheat dissipation effectivenessVSAvoidstructure complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent combines the heat dissipation function with the existing LED board by integrating thermally dissipative materials directly into the board structure. The LED board serves dual purposes: electrical circuit support and heat dissipation, eliminating the need for a separate heat sink component and reducing overall device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The LED board is designed to perform multiple functions simultaneously: it provides electrical circuit support for the LEDs and acts as a thermal management component through its thermally dissipative properties. This multi-functionality reduces the total number of components needed in the lighting system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Temperature

If a separate heat sink is added to dissipate heat from LEDs, then heat dissipation effectiveness is improved, but the compact form factor is compromised

Engineering Contradiction:

Improveheat dissipation effectivenessVSAvoidlamp volume

Core Design Contradiction:

TemperatureVSVolume of moving object

Solution Approach 1:

The heat dissipation function is merged into the LED board itself, which is already a necessary component of the lamp. By making the LED board thermally dissipative, the patent eliminates the need for additional volume-consuming heat sink structures, maintaining the compact form factor required for bulb replacement applications.

Inventive Principle:

Principle #5Merging (Combining)

3Illumination intensity

If diffusive lenses are positioned close to LEDs for light diffusion, then light uniformity is improved, but heat dissipation efficiency deteriorates

Engineering Contradiction:

Improvelight uniformityVSAvoidheat dissipation efficiency

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The patent applies different functional properties to different regions of the LED board: the areas near the LEDs have high thermal conductivity for efficient heat dissipation, while the diffusive lenses positioned closer to the LEDs provide light uniformity. This localized functional differentiation allows both heat dissipation and light diffusion to work effectively without mutual interference.

Inventive Principle:

Principle #3Local quality

4Illumination intensity

If an optically transmissive enclosure is used for light distribution, then light diffusion is improved, but heat dissipation capability is reduced

Engineering Contradiction:

Improvelight distribution uniformityVSAvoidheat dissipation capability

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The enclosure is designed with differentiated optical properties: regions closer to the LEDs have higher optical transparency to allow efficient light extraction and distribution, while regions farther from the LEDs have higher thermal conductivity to facilitate heat dissipation to the ambient environment. This spatial variation in material properties resolves the conflict between light distribution and heat dissipation.

Inventive Principle:

Principle #3Local quality

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 effectively dissipates heat and provides a uniform omnidirectional light pattern, meeting energy efficiency standards and allowing the LED lamp to operate without a separate heat sink, enhancing its compactness and efficiency.

Implementation Method 1

The LED board may dissipate heat from the first LED and the second LED without a heat sink

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

The first diffusive lens and the second diffusive lens may provide a diffuse scattering layer that produces a more uniform far field pattern

Methodology Applied

Scientific EffectLight scattering: Scattering

Data Source

PatentUS10082269B2LED lamp

Publication Date: 2018.09.25 PROSPERINA VENTURES LLC

AI summary

A lamp includes an optically transmissive enclosure and a base connected to the enclosure. A LED board is positioned in the enclosure and has a first side and a second side. A first LED array is mounted on the first side and a second LED array is mounted on the second side where the LED arrays are operable to emit light when energized through an electrical path from the base. A first diffusive lens and a second diffusive lens are located inside of and spaced from the enclosure. The first diffusive lens receives light emitted from the first LED array and the second diffusive lens receives light emitted from the second LED array.