Light Shield Aperture Optics for Uniform LED Illumination
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Solution Overview
Problem
Existing lighting devices using LED emitters often suffer from non-uniform light intensity and hot spots, which can be perceived as separate light sources, detracting from a seamless and uniform illumination effect.
Innovation Solution
The lighting device incorporates internal optical structures with light shields and reflectors that redirect and diffuse light, using apertures and lenses to distribute light uniformly across the cover lens, minimizing hot spots and creating a continuous light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED emitters are used for illumination, then power consumption is reduced and lifetime is extended, but non-uniform light intensity and hot spots occur
Solution Approach 1:
The lighting device is divided into multiple independent emitter modules arranged in series, with each module containing its own optical structures (light shield, reflector, lenses). This segmentation allows independent optimization of light distribution in each module, preventing hot spots and achieving uniform overall illumination while maintaining LED energy efficiency.
Solution Approach 2:
Optical intermediary structures including light shields, reflectors, and lenses are introduced between the LED emitters and the final light output. These intermediaries redirect and diffuse the light from high-intensity LED sources to achieve uniform illumination, resolving the contradiction between energy efficiency and light uniformity.
2Adaptability or versatility
If multiple LED emitters are combined in the same package, then white light with wide gamut of color points is generated, but non-uniform brightness distribution occurs
Solution Approach 1:
Multiple LED emitters with different color temperatures are segmented into separate emitter modules, each with its own optical control structures. This allows independent optimization of light distribution for each color temperature source, achieving uniform brightness while maintaining the ability to generate white light with wide gamut of color points.
Solution Approach 2:
Different optical structures (light shields, reflectors, lenses) are tailored for each emitter module based on its specific color temperature and emission characteristics. This local optimization ensures that each emitter contributes uniformly to the overall light output, resolving the brightness uniformity issue while preserving color temperature versatility.
3Illumination intensity
If light shields with apertures are used to redirect light, then uniform brightness distribution is achieved, but device complexity increases
Solution Approach 1:
The optical control function is segmented into modular light shields with apertures, reflectors, and lenses that can be independently manufactured and assembled. This modular segmentation manages complexity by breaking down the overall optical system into standardized, repeatable units that achieve uniform brightness distribution.
Solution Approach 2:
The light shield with apertures serves multiple functions: it redirects light from emitters, creates uniform brightness distribution, and defines the optical path for subsequent reflectors and lenses. This multi-functionality reduces the number of separate components needed, managing device complexity while achieving brightness uniformity.
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 substantially uniform brightness and color distribution along the length of the lighting device, eliminating perceptible hot spots and providing a cohesive illumination effect.
Implementation Method 1
The light shield may include a first surface configured to reflect the light emitted by emitter
Implementation Method 2
The reflector may be configured to reflect the light generated by the emitter toward the first lens
Implementation Method 3
The second lens may be configured to diffuse the redirected first portion of light prior to passing through the first lens
Implementation Method 4
The first lens may be configured to diffuse the light generated by the emitter
Data Source
AI summary
A lighting device may include a first lens, a housing defining a cavity, an emitter, a reflector, and an internal optical structure. The emitter may be mounted within the housing. The emitter may be configured to generate light. The reflector may be located within the cavity. The reflector may be configured to reflect the light generated by the emitter toward the first lens. The internal optical structure may be located between the emitter and the first lens. The internal optical structure may include a second lens and a light shield between the second lens and the emitter. The light shield may include a first surface configured to reflect the light emitted by emitter. The light shield may include one or more apertures therethrough that are configured to allow the light emitted by the emitter to pass therethrough.