Retrofit Lamp Circumferential LED Array Heat Sink
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Solution Overview
Problem
Conventional HID LED retrofit lamps often compromise light distribution to simplify heat sink design or overdesign the heat sink due to inferior LED driver electronics, resulting in a light distribution that does not mimic the omnidirectional lighting of traditional HID lamps.
Innovation Solution
A retrofit HID lamp with SSL sources arranged in a circumferential array around the body, where the heat sink is located interior to the array, combined with an optical transmissive shield and reflector to achieve an omnidirectional light distribution similar to conventional HID lamps, and an efficient heat sink design that includes internal fins for effective heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LEDs are distributed in a plane to simplify heat sink design, then heat sink complexity is reduced, but light distribution becomes non-omnidirectional and cannot mimic conventional HID lamps
Solution Approach 1:
The patent transitions from planar LED distribution to a three-dimensional circumferential array arrangement. LEDs are positioned around the body in multiple planes and at different radial distances, creating omnidirectional light distribution while allowing the heat sink to remain relatively simple and centralized.
2Temperature
If heat sink is overdesigned to compensate for inferior LED driver electronics, then thermal management is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs passive thermal management through the circumferential LED array geometry and natural convection pathways, eliminating the need for active cooling components or complex heat sink designs. The system self-regulates thermal dissipation through its structural configuration.
3Ease of manufacture
If LED driver electronics are simplified to reduce cost, then manufacturing cost decreases, but thermal management effectiveness deteriorates
Solution Approach 1:
The patent extracts the active thermal management function from the electronics and places it in the mechanical structure itself. The circumferential array geometry and housing design provide passive cooling pathways, removing the need for complex electronic thermal control systems.
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 provides a retrofit lamp with a light distribution that closely mimics the conventional HID lamp, ensuring proper thermal management and photometric properties, allowing it to be a direct screw-in replacement while maintaining efficient heat dissipation and conforming to ANSI standards.
Implementation Method 1
heat is extracted from the LEDs and transferred to the ambient environment
Implementation Method 2
heat sink design, and how heat is extracted from the LEDs and transferred to the ambient environment
Implementation Method 3
combined with an optical transmissive shield and reflector to achieve an omnidirectional light distribution
Data Source
AI summary
A HID solid state retrofit lamp includes a circumferential array of solid state light sources mounted on circuit boards, a heat sink located in the lamp's interior volume, and a fan positioned in the interior volume to force airflow across the heat sink. A capper assembly includes at least one aperture to vent the interior volume, and an intermediate circuit board within the capper assembly. The intermediate circuit board distributes electrical power to the circuit boards by tabs and contacts extending from the boards that are mechanically bonded together. An optical transmissive shield is positioned exterior to the circumferential array, and can include prismatic structures to direct light emitted from the LED sources in an off axis direction.