LED Light Distribution Adjusting Member with Curved Surfaces
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Solution Overview
Problem
Light emitting diode (LED) illumination devices exhibit high directivity and non-uniform light distribution due to the use of semicylindrical or hemispherical transparent resin parts, leading to increased luminance in certain areas and surface reflection, which results in a granule-like distribution of light.
Innovation Solution
A light emitting device with a light distribution adjusting member featuring a concave curved surface and convex curved surface portions, along with an accommodating portion that refracts and reflects light to achieve a wider distribution and reduce directivity, incorporating a transparent resin member and wavelength converting materials to enhance light diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a semicylindrical or hemispherical transparent resin part is used to cover LEDs, then light collection efficiency is improved, but light distribution uniformity deteriorates
Solution Approach 1:
The patent employs a semicylindrical transparent resin part with a specific curved surface geometry to cover the LEDs. The curvature is designed to refract light at specific angles, improving light collection while the longitudinal extension helps distribute light more uniformly across the output surface, reducing the concentrated spots caused by simple hemispherical shapes.
Solution Approach 2:
The transparent resin part is designed as a semicylindrical shape rather than a simple hemisphere, extending in the longitudinal direction. This adds a dimensional element that spreads light distribution across a wider area, preventing concentration of light in specific spots while maintaining the light collection benefits of the curved surface.
2Power
If LEDs are arranged in an array on a board, then light output quantity is improved, but directivity increases
Solution Approach 1:
Multiple LEDs arranged in an array are covered by a single semicylindrical transparent resin part that spans across them. This merging approach combines the light output from multiple LEDs into a unified optical structure, distributing the light more evenly and reducing the directivity that would result from individual LED coverage.
Solution Approach 2:
The semicylindrical curved surface acts as a common optical element for multiple LEDs, refracting and distributing light from each LED in a coordinated manner. This curvature helps to diffuse the combined light output, reducing the overall directivity while maintaining high light output quantity from the array.
3Area of stationary object
If a diffusion and transmission panel is disposed adjacent to LED packages, then light coverage area is improved, but non-uniform luminance distribution occurs
Solution Approach 1:
The semicylindrical transparent resin part with its curved surface is positioned to work in conjunction with the diffusion and transmission panel. The curved surface pre-distributes light before it reaches the panel, reducing the granule-like distribution that occurs when LEDs directly interface with the panel, thereby achieving more uniform luminance across the covered area.
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 widens the light distribution and prevents non-uniformity, providing a more uniform luminance distribution and reducing surface reflection in LED-based illumination apparatuses.
Implementation Method 1
a concave curved surface portion provided above light output surfaces of the solid-state light emitting elements and immediately above the solid-state light emitting elements
Implementation Method 2
a pair of convex curved surface portions which are provided in opposite sides of the concave curved surface portion
Data Source
AI summary
A light emitting device includes a plurality of solid-state light emitting elements; a board on which the solid-state light emitting elements are arranged in the form of an array; and a light distribution adjusting member for adjusting a distribution of lights outputted from the solid-state light emitting elements. The light distribution adjusting member is provided to commonly cover at least two of the solid-state light emitting elements, and includes an accommodating portion which accommodates the solid-state light emitting elements; a concave curved surface portion provided above light output surfaces of the solid-state light emitting elements and immediately above the solid-state light emitting elements; and a pair of convex curved surface portions which are provided in opposite sides of the concave curved surface portion, each of the convex curved surface portions being smoothly connected to the concave curved surface portion.