LED Candelabra Lamp with Nested Heat Sink and Filament Optic
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Solution Overview
Problem
Incorporating LED technology into candelabra lamps while maintaining the traditional smaller form factor poses challenges due to the limited internal space, requiring innovative designs to mimic the visual appearance and functionality of incandescent bulbs.
Innovation Solution
The design features a non-optically transmissive base with an optically transmissive enclosure and a thermally coupled heat sink, along with an optic element that mimics the appearance of a traditional incandescent filament, using a single SMD LED component and phosphor to achieve a high CRI and specific color temperature, and includes a wireless module for control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If LED technology is incorporated into candelabra lamps, then energy efficiency and durability are improved, but the limited internal space of the smaller form factor makes it difficult to accommodate LED components and heat dissipation structures
Solution Approach 1:
The patent places the LED assembly, heat sink, and electronics nested within the limited internal volume of the candelabra bulb, with the heat sink forming a cavity structure that houses the electronics while the LED assembly is positioned to couple with the heat sink, maximizing space utilization in the constrained form factor
Solution Approach 2:
The patent extends the heat sink and electronics beyond the traditional base plane into the longitudinal space of the bulb, utilizing the length dimension rather than only radial space, allowing adequate heat dissipation and electronics placement without increasing the bulb's external dimensions
2Duration of action of stationary object
If LED technology is used, then operational lifespan is improved, but maintaining the visual appearance of traditional incandescent filaments becomes challenging
Solution Approach 1:
The patent uses an optic element with a light emitting portion configured to visually appear like a filament, copying the aesthetic appearance of traditional incandescent bulbs while using LED technology for the actual light generation, thus maintaining the desired visual characteristics without the limitations of incandescent filaments
Solution Approach 2:
The patent introduces an optic element as an intermediary between the LED assembly and the external environment, which transforms the LED light output into a visual appearance that mimics a traditional filament, mediating between the functional LED source and the aesthetic requirements
3Temperature
If heat dissipation structures are added to LED assemblies, then thermal management is improved, but device complexity increases
Solution Approach 1:
The heat sink serves multiple functions: it provides thermal management for the LED assembly, forms a structural cavity for housing electronics, and acts as a mounting surface for the LED assembly, thereby reducing overall device complexity through multi-functionality rather than adding separate components for each function
4Shape
If the optic element extends to mimic filament appearance, then visual authenticity is improved, but the space available for other components is reduced
Solution Approach 1:
The patent positions the LED assembly and heat sink in the longitudinal dimension of the bulb rather than occupying the central radial space, allowing the optic element to extend through the center to create the filament appearance while leaving adequate space for thermal management and electronics in the base region
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 replaces traditional incandescent candelabra bulbs with LED technology, providing high CRI, adjustable color temperature, and wireless control, while maintaining a visually appealing and functional form factor.
Implementation Method 1
An LED assembly emits light when energized through an electrical path from the base
Implementation Method 2
The LED assembly may be thermally coupled to a heat sink
Implementation Method 3
An optic element in the enclosure receives the light emitted by the LED assembly. The optic element comprises a first portion that extends to the first side of the plane for transmitting light
Implementation Method 4
The optic element may comprise a stem having a first width and a base having a second width where the second width is at least three times greater than the first width
Implementation Method 5
using a single SMD LED component and phosphor to achieve a high CRI and specific color temperature
Data Source
AI summary
A LED lamp has a non-optically transmissive base connected to an optically transmissive enclosure. A LED assembly emits light when energized through an electrical path from the base. A portion of the heat sink and lamp electronics extend from the base and into the enclosure such that at least an upper portion of the heat sink extends into the interior volume defined by the enclosure. The LED assembly is supported on top of the heat sink such that the LEDs are disposed in the volume of the enclosure. An optic element extends over the LEDs and at least the portion of the heat sink. The size of the non-optically transmissive base of the lamp is reduced relative to the optically transmissive enclosure such that a greater ratio of optically transmissive view space to non-optically transmissive base is provided.