Twisted Filament Lamp Design for Thermal Radiation

Solution Overview

Problem

Conventional lamps with spirally-wound filaments suffer from reduced thermal energy radiation due to filament sagging, increased breakage risk from temperature differences, and higher costs and complexity in manufacturing.

Innovation Solution

A lamp design featuring a twisted filament within a hermetic quartz glass tube, where the filament is tensioned and separated from the tube to prevent sagging and breakage, with leads and holders to maintain tension and support, and caps for sealing, allowing for higher temperature operation without damaging the tube.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of moving object

If the filament is wound into a spiral shape to increase radiation area, then the radiation area is increased, but the filament sags and contacts the tube which limits the maximum temperature to about 1270K

Engineering Contradiction:

Improveradiation areaVSAvoidmaximum operating temperature

Core Design Contradiction:

Area of moving objectVSTemperature

Solution Approach 1:

The patent applies curvature by twisting the filament into a helical shape around a central axis rather than using a simple spiral configuration. This curved geometry increases the radiation surface area while maintaining structural integrity and preventing contact with the tube, thereby enabling higher operating temperatures.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Area of moving object

If the filament is wound into a spiral shape, then the radiation area is increased, but the temperature difference between contact and non-contact portions increases causing breakage

Engineering Contradiction:

Improveradiation areaVSAvoidfilament durability

Core Design Contradiction:

Area of moving objectVSReliability

Solution Approach 1:

The patent introduces asymmetry in the filament structure by twisting it into a helical configuration with specific geometric parameters rather than a symmetric spiral. This asymmetric design creates more uniform heat distribution and reduces localized thermal stress, thereby preventing breakage while maintaining radiation efficiency.

Inventive Principle:

Principle #4Asymmetry

3Ease of manufacture

If the filament is made straight to reduce manufacturing complexity, then the manufacturing process is simplified, but the radiation area is reduced

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidradiation area

Core Design Contradiction:

Ease of manufactureVSArea of moving object

Solution Approach 1:

The patent applies curvature by twisting the filament into a helical shape around a central axis rather than using a simple spiral configuration. This curved geometry increases the radiation surface area while maintaining structural integrity and preventing contact with the tube, thereby enabling higher operating temperatures.

Inventive Principle:

Principle #14Spheroidality (Curvature)

4Quantity of substance

If the filament is made straight to reduce length, then the material cost is reduced, but the radiation area and thermal energy output are reduced

Engineering Contradiction:

Improvefilament material quantityVSAvoidthermal energy radiation

Core Design Contradiction:

Quantity of substanceVSPower

Solution Approach 1:

The patent applies curvature by twisting the filament into a helical shape around a central axis rather than using a simple spiral configuration. This curved geometry increases the radiation surface area while maintaining structural integrity and preventing contact with the tube, thereby enabling higher operating temperatures.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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

Enhanced thermal energy radiation capabilities, reduced filament breakage, and lower production costs due to simpler and more efficient manufacturing processes.

Implementation Method 1

a lamp that radiates high-temperature thermal energy

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Implementation Method 2

a lamp radiates light using a heated filament

Methodology Applied

Scientific EffectIncandescence: Incandescence

Implementation Method 3

a tension is applied to the filament in a direction of the filament

Methodology Applied

Scientific EffectTension: Tension

Data Source

PatentUS7705526B2Lamp with twisted filament structure

Publication Date: 2010.04.27 LG ELECTRONICS INC

AI summary

A lamp including a hermetic tube and a filament configured to radiate thermal energy within the tube. Further, the filament extends along a length direction of the tube and is spaced apart from an inner wall of the tube.