Coated LED Diffuser Cap for Wide-Angle Illumination
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Solution Overview
Problem
LEDs used in illumination applications have a narrow light distribution angle, which is dissimilar to the wide-angle light distribution of conventional incandescent light bulbs, limiting their effectiveness in replacing incandescent bulbs in various lighting devices.
Innovation Solution
The design of an LED illumination device that includes multiple LED chips configured in an array to provide enhanced illumination uniformity across a wide angle, with a cap having a coating material that combines reflection and diffusion characteristics to distribute light evenly across a wide angle (>180°), and a heat sink for effective heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single LED is used for illumination, then power consumption is reduced and lifetime is extended, but light distribution angle becomes narrow and illumination uniformity deteriorates
Solution Approach 1:
The patent divides a single LED light source into multiple LED chips (e.g., 9 chips arranged in a 3x3 array) to maintain energy efficiency while achieving wide-angle light distribution. Each LED chip emits light independently, and their combined effect provides both narrow individual beams and wide overall distribution through proper optical design.
Solution Approach 2:
The patent employs a cap structure that encloses multiple LED chips, with each chip nested within the cap's optical cavity. The cap integrates multiple functions: it houses the LED array, provides optical diffusion through its material properties, and directs light distribution. This nested arrangement allows compact packaging of multiple light sources while maintaining individual chip efficiency.
2Device complexity
If a single LED is used for illumination, then device complexity is reduced, but illumination uniformity across wide angle deteriorates
Solution Approach 1:
The patent applies local quality by positioning LED chips at specific locations within the cap structure and using a diffusion coating on the cap's inner surface. Each LED chip contributes to a specific region of light distribution, and the diffusion coating uniformly scatters light across the cap's interior, ensuring even illumination distribution across the entire wide viewing angle.
Solution Approach 2:
The patent transitions from a single-point light source to a distributed array of multiple LED chips arranged in a two-dimensional pattern within the cap. This spatial arrangement in multiple dimensions allows the system to achieve wide-angle uniform illumination by combining light from multiple discrete sources positioned at different locations and orientations.
3Use of energy by moving object
If conventional incandescent bulbs are replaced by LEDs, then energy efficiency is improved, but light distribution similarity to incandescent bulbs deteriorates
Solution Approach 1:
The patent creates a multi-functional LED illumination device that maintains the energy efficiency of LEDs while achieving incandescent-like wide-angle light distribution. The cap structure serves multiple purposes: it houses the LED array, provides optical diffusion to soften and spread light, and shapes the beam pattern to match conventional bulb characteristics, making it compatible with existing lighting fixtures and applications.
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 achieves a wide-angle light distribution similar to incandescent bulbs, enhancing illumination uniformity and efficiency while ensuring effective heat management, thereby improving the LED's suitability for various lighting applications.
Implementation Method 1
The cap includes a coating material that comprises both diffusion and reflection characteristics
Implementation Method 2
The cap includes a coating material that comprises both diffusion and reflection characteristics
Implementation Method 3
a heat sink for effective heat dissipation
Data Source
AI summary
The present disclosure provides an illumination device. The illumination device comprises a light-emitting diode (LED) device on a substrate, a heat sink and a cap. The heat sink is thermally connected to the LED device. The cap is secured over the substrate and covering the LED device. The cap includes a coating material having diffusion and reflection characteristics, and the coating material is free of being in direct contact with the LED device. The coating material is applied on a first portion of an inner surface of the cap, but not on a second portion of the inner surface of the cap.