Parabolic Lens for Cross-Shaped Beam Pattern in LED Packages
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Solution Overview
Problem
Conventional light emitting device packages struggle to achieve a cross-shaped beam pattern for specific illumination applications, such as automotive lighting, due to limitations in light distribution and beam angle control.
Innovation Solution
A light emitting device package design featuring a lens with parabolic lateral surfaces and a semi-spherical light incidence portion, where the lens has a lower surface portion, an upper surface portion, and lateral surfaces with parabolic curvature, allowing for a cross-shaped light distribution by refracting light emitted from the light emitting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a conventional lens design is used, then the manufacturing process is simple, but the light distribution cannot achieve a cross-shaped beam pattern
Solution Approach 1:
The patent applies parabolic curvature to the lateral surfaces of the lens instead of conventional spherical or flat designs. The first and second lateral surfaces are specifically designed with parabolic shapes having different focal lengths, which enables the light to be refracted into a cross-shaped beam pattern while maintaining a systematic manufacturing approach
Solution Approach 2:
The patent changes the optical parameters of the lens by specifying different focal lengths for the parabolic lateral surfaces (first focal length f1 and second focal length f2). By adjusting these focal length parameters and the distance between surfaces, the beam pattern can be controlled to achieve the desired cross-shape
2Length of moving object
If the lateral surfaces are positioned close together, then the lens size is compact, but the beam angle control precision is insufficient
Solution Approach 1:
The patent transitions from controlling beam parameters in a single dimension to using multiple dimensions by introducing both the distance between lateral surfaces (d) and the focal lengths (f1, f2) as independent control parameters. This multi-dimensional parameter space allows for precise beam angle control while maintaining compact lens dimensions
3Manufacturing precision
If the parabolic lateral surfaces are positioned far apart, then the beam angle control is precise, but the overall lens size increases
Solution Approach 1:
The patent optimizes the balance between lens length and beam angle control by establishing specific parameter relationships: the distance between lateral surfaces d should satisfy 0.5f1 < d < 2f1 (where f1 is the first focal length). This parameter optimization enables precise beam control while preventing excessive lens size increase
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 design effectively achieves a cross-shaped beam pattern, enhancing light distribution and meeting the requirements for automotive lighting applications like turn indicators, sidelights, and tail lamps by optimizing the beam angle and intensity.
Implementation Method 1
a lens disposed on the light emitting device, wherein the lens includes a lower surface portion, an upper surface portion parallel to the lower surface portion, and a lateral surface portion positioned between the lower surface portion and the upper surface portion with a plurality of lateral surfaces, wherein the plurality of lateral surfaces is formed in a shape of a parabola
Data Source
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Figure 5~6A
AI summary
Embodiments provide a light emitting device package including a body, a light emitting device the body, and a lens disposed on the light emitting device, wherein the lens includes a lower surface portion, an upper surface portion parallel to the lower surface portion, and a lateral surface portion positioned between the lower surface portion and the upper surface portion and provided with a plurality of lateral surfaces, wherein the plurality of lateral surfaces is formed in a shape of a parabola.