LED Lamp Cover with Segmented Transmissive Regions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional high-output LED light bulbs face challenges in providing uniform light distribution due to heat dissipation requirements, which often obstruct light output near the base and result in shadows, making them less desirable for applications like table lamps.
Innovation Solution
The design incorporates a cover with distinct transmissive regions, including a non-diffusing portion proximate to the LED support structure and a diffusing portion distal from it, allowing for enhanced light escape and heat dissipation through strategically placed apertures, reducing the need for external heatsinks and improving light output near the base.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heatsink is arranged between the base and globe portions of the bulb to dissipate heat, then heat dissipation is improved, but light output near the base is blocked
Solution Approach 1:
The cover is segmented into multiple transmissive regions with different optical properties: a first transmissive region proximate to the LED support structure that permits undiffused light passage, and a second transmissive region distal from the support structure that permits diffused light passage. This segmentation allows light to escape from multiple zones while heat dissipation pathways remain unobstructed.
Solution Approach 2:
Different portions of the cover are assigned different optical qualities: the first transmissive region is configured for undiffused light transmission to enhance base area illumination, while the second transmissive region is configured for diffused light transmission. This local differentiation resolves the contradiction by optimizing light output in specific zones without compromising overall heat dissipation.
2Temperature
If a conventional heatsink design is used, then thermal management is improved, but uniform light distribution deteriorates due to shadows
Solution Approach 1:
The invention transitions from a single-zone light transmission approach to a multi-zone transmissive cover with distinct regions. The first transmissive region proximate to the LED support structure provides undiffused light for uniform distribution, while the second distal region provides diffused light, creating a dimensional differentiation in light transmission pathways that eliminates shadows while maintaining thermal management.
3Temperature
If external heatsinks are used for thermal management, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The cover is designed to perform multiple functions simultaneously: it provides structural enclosure, enables light transmission with differentiated optical properties, and facilitates heat dissipation. By merging these functions into a single integrated component rather than using separate external heatsinks, device complexity is reduced while thermal management effectiveness is maintained.
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 enhances light output near the base of the LED light bulb, reduces heat-related obstructions, and allows for tailored light characteristics, addressing the limitations of conventional LED bulbs by improving both light distribution and thermal management.
Implementation Method 1
the first transmissive region and the second transmissive region differently affect light emissions transmitted therethrough
Implementation Method 2
a non-diffusing portion proximate to the support structure and arranged to permit passage of substantially undiffused light, and (b) a diffusing portion distal from the support structure and arranged to permit passage of diffused light
Implementation Method 3
When bias is applied across doped layers, holes and electrons are injected into one or more active layers where they recombine to generate light that is emitted from the device
Implementation Method 4
A representative example of a white LED lamp includes a package of a blue LED chip (e.g., made of InGaN and/or GaN), coated with a phosphor (typically YAG:Ce) that absorbs at least a portion of the blue light and re-emits yellow light
Implementation Method 5
Heat dissipating elements such as heatsinks are commonly provided in thermal communication with high intensity LEDs, since is necessary to prevent a LED from operating at an unduly high junction temperature
Data Source
AI summary
A LED lamp including a cover with first and second transmissive regions that differently affect light emissions (e.g., with respect to diffusion, color, or other characteristics) transmitted therethrough. One or more apertures may be defined in a diffusive cover for a LED lamp to permit flow of air and escape of heat, and also to permit escape of directly emitted or reverse scattered light proximate to a base of the LED lamp. Multiple diffuser segments may be overlapped with intervening apertures.