LED Module Stem Fixation for Light Distribution and Heat Dissipation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional light bulb shaped LED lamps face challenges in achieving light distribution properties similar to incandescent bulbs, with issues such as blocked light, unstable LED module positioning, heat dissipation, and complex assembly due to the metal case design.

Innovation Solution

A light bulb shaped lamp design featuring a hollow globe with a stem extending inside to directly fix the LED module, allowing for firm positioning and heat dissipation, and using a translucent or transparent adhesive and stem materials to maintain light clarity and prevent shadowing, while ensuring the LED module is securely attached to the stem.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a metal case is provided between the semispherical globe and base to suppress temperature increase of LED, then heat dissipation is improved, but light distribution property deteriorates due to blocked light toward the base

Engineering Contradiction:

ImproveLED temperatureVSAvoidlight distribution property

Core Design Contradiction:

TemperatureVSIllumination intensity

Solution Approach 1:

The invention extracts and removes the metal case from the lamp structure. By eliminating the metal case that blocked light, the patent achieves light distribution properties equivalent to incandescent bulbs while maintaining LED temperature control through alternative means (direct fixation to stem and heat dissipation through lead wires)

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The stem is given multiple functions: it provides structural support for the globe, serves as a heat dissipation path for the LED module, and acts as a fixation point for the LED module. This multi-functional design eliminates the need for a separate metal case while achieving both light distribution and temperature control

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Illumination intensity

If the LED module is supported only by lead wires like filament coil, then light distribution property is improved, but positioning stability deteriorates due to vibration and transportation stress

Engineering Contradiction:

Improvelight distribution propertyVSAvoidLED module positioning stability

Core Design Contradiction:

Illumination intensityVSStability of the object's composition

Solution Approach 1:

The invention merges the support function with the fixation function by directly fixing the LED module to the stem. This combination provides both the light distribution benefits of lead wire support and the positioning stability of rigid fixation, preventing disconnection during vibration and transportation

Inventive Principle:

Principle #5Merging (Combining)

3Stability of the object's composition

If LED module is directly fixed to stem, then positioning stability is improved, but assembly complexity increases due to need for precise positioning and alignment

Engineering Contradiction:

ImproveLED module positioning stabilityVSAvoidassembly complexity

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The invention applies preliminary action by pre-forming engagement protrusions on the stem and corresponding engagement recesses on the LED module base platform. These pre-formed features guide automatic alignment during assembly, eliminating the need for precise manual positioning while maintaining stable fixation

Inventive Principle:

Principle #10Preliminary action

4Temperature

If metal case is used for heat dissipation, then heat dissipation efficiency is improved, but device complexity increases due to integral formation of light-source attachment and peripheral portion

Engineering Contradiction:

Improveheat dissipation efficiencyVSAvoidcase structure complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The invention segments the heat dissipation function from the structural case by using separate components (stem and lead wires) for heat dissipation. This segmentation simplifies the overall device structure by eliminating the complex integral metal case while maintaining effective heat dissipation through distributed thermal paths

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

The design achieves light distribution properties equivalent to incandescent bulbs, enhances heat dissipation, and simplifies assembly by securely fixing the LED module and base platform, preventing light loss and shadowing, and ensuring reliable operation.

Implementation Method 1

the heat generated at the LED is efficiently conducted from the light-source attachment 1220 to the peripheral portion 1210

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Implementation Method 2

the light-emitting module is directly fixed to the stem

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS9285104B2Light bulb shaped lamp and lighting apparatus

Publication Date: 2016.03.15 SIGNIFY HOLDING BV

AI summary

A light bulb shaped lamp according to the present invention includes: a hollow globe; an LED module including a base platform and an LED chip mounted on the base platform, the LED module being provided in the globe; a lead wire for supplying power to the LED module; and a stem extending toward the interior of the globe, in which the base platform is directly fixed to the stem.