LED Lighting Device with Segmented Lens Plate for Uniform Illumination
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Solution Overview
Problem
Conventional outdoor lighting devices using white light-emitting diodes are bulky and complex in structure, and their light distribution is limited to a central area, making them inefficient when not installed at the center of the area to be lit, and they struggle to distribute light uniformly due to directional control of emitted light.
Innovation Solution
A compact lighting device with an elongated flat substrate and a lens plate featuring a first lens section with curvature surfaces and prisms for longitudinal light distribution, and a second lens section with a cylindrical lens for orthogonal light distribution, allowing light to be directed uniformly without forming secondary peaks, regardless of the device's position relative to the area to be lit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If white light-emitting diodes are arranged in a staircase pattern to scatter light uniformly, then light distribution is improved, but device complexity and size increase
Solution Approach 1:
The lens plate is divided into multiple lens sections, each responsible for controlling light in specific directions. This segmentation allows complex light distribution to be achieved through simpler, modular lens elements rather than a complex staircase structure
Solution Approach 2:
A lens plate is introduced as an intermediary component between the light source and the area to be illuminated. The lens plate performs the light scattering and distribution function, eliminating the need for complex mechanical structures like staircases
2Loss of energy
If a light emission lens is used to collimate and scatter light, then light utilization efficiency is improved, but the device cannot be installed off-center and structure complexity increases
Solution Approach 1:
The lens plate is designed with multiple lens sections that provide both collimation and scattering functions in a single component. This multi-functionality allows the device to maintain high light utilization efficiency while being adaptable to various installation positions and angles
Solution Approach 2:
The lens plate design allows for adjustable installation angles and positions. The optical system maintains its effectiveness across different orientations, providing dynamic adaptability to various installation scenarios without requiring precise centering
3Device complexity
If a cylindrical lens is used to control light in one direction, then device structure is simplified, but light distribution uniformity deteriorates
Solution Approach 1:
The lens plate is divided into multiple lens sections, each with specific optical functions. This segmentation enables uniform light distribution in both longitudinal and width directions while keeping each individual lens section relatively simple in structure
Solution Approach 2:
The patent extends the optical control from one dimension (cylindrical lens) to two dimensions by adding lens sections that control light in orthogonal directions. This dimensional expansion achieves uniform light distribution across the entire illuminated area while maintaining structural simplicity
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 simplifies the structure, enables effective and balanced light distribution across a wide area, and allows for easy operation without adjusting the installation angle, ensuring uniform illumination without secondary peaks, regardless of the device's position.
Implementation Method 1
a first lens section formed on one of the lens-light-incident surface and the lens-light-emitting surface and scattering the light emitted by the semiconductor light sources in the longitudinal direction; and the first lens section has a curvature surface unit including two or more convex section curvature surfaces having different curvature radii
Implementation Method 2
a second lens section formed on the other one of the lens-light-incident surface and the lens-light-emitting surface and distributing the light emitted by the semiconductor light sources in a width direction
Implementation Method 3
the light emission lens has an incident-side-refraction area and an incident-side-total-reflection area on an incidence surface facing the light source
Data Source
AI summary
A lighting device (1) is configured to include: an elongated flat substrate (2); a plurality of semiconductor light sources (3) arranged on the flat substrate in a longitudinal direction of the flat substrate; and a lens plate (4) disposed to face the semiconductor light sources, wherein the lens plate includes a lens-light-incident surface facing the semiconductor light sources and includes a lens-light-emitting surface, a first lens section (5) is formed on one of the lens-light-incident surface and the lens-light-emitting surface and distributing the light emitted by the semiconductor light source in the longitudinal direction, a second lens section (9) is formed on the other one of the lens-light-incident surface and the lens-light-emitting surface for distributing the light emitted by the semiconductor light sources in a width direction, and the first lens section has a curvature surface unit including two or more convex section curvature surfaces having different curvature radii and formed adjacent in the longitudinal direction, each convex section's curvature surface is disposed inside a facing area facing an area corresponding to a width of each semiconductor light source in the longitudinal direction.