Light-emitting Element Package with Patterned Molded Part for Central Illuminance
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Solution Overview
Problem
Conventional light-emitting element packages experience reduced central illuminance when attempting to increase the range of light distribution, leading to decreased illuminance in the central area.
Innovation Solution
A light-emitting element package design featuring a substrate with a light-emitting element and a molded part having a pattern of protrusions on its surface, where the protrusions are cylindrical with a curved upper surface, and are disposed within an angular range of 120 to 130 degrees, enhancing light refraction and distribution while maintaining high central illuminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the lens is used to adjust the distribution of light discharged from the light-emitting element package to increase the range of distribution, then the light emission angle is increased, but the illuminance in the central area is reduced
Solution Approach 1:
The patent applies local quality by creating different surface regions on the molded part with distinct functions: a first area with a pattern of protrusions to control and concentrate light in the central region, and a second area without protrusions to allow broader light distribution. This spatial differentiation of surface properties enables simultaneous optimization of central illuminance and distribution range.
Solution Approach 2:
The patent segments the molded part surface into distinct functional zones: a first area containing multiple protrusions arranged in a pattern, and a second area surrounding the first area that is free of protrusions. This segmentation allows independent optimization of light control in the central region versus broader distribution in peripheral regions, resolving the contradiction between central illuminance and distribution range.
2Area of stationary object
If the light emission angle is increased to expand the distribution range, then the coverage area is improved, but the illuminance concentration in the central area deteriorates
Solution Approach 1:
The patent implements local quality by endowing different regions of the molded part with specialized optical functions. The first area features a pattern of protrusions that refract and concentrate light to maintain high central illuminance, while the second area provides an open surface that permits wide-angle light distribution, thus achieving both high coverage area and concentrated central illuminance.
Solution Approach 2:
The patent divides the molded part surface into a first area with light-controlling protrusions and a second area without protrusions. This segmentation enables the system to simultaneously achieve narrow beam concentration for high central illuminance and wide angular distribution for large coverage area, as each zone performs its specialized function independently.
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 achieves higher illuminance in the direction orthogonal to the center of the emission surface, with illuminance at 30 degrees from the emission surface being lower than at the center, thereby increasing central area illuminance effectively.
Implementation Method 1
Since light is refracted when passing through the molded part, which is formed of, for example, silicon, the molded part may serve as a primary lens.
Data Source
AI summary
Provided is a light-emitting element package, one embodiment comprising: a substrate; a light-emitting element disposed on the substrate; and a molded part surrounding the side surfaces and the top surface of the light-emitting element and having patterns on a surface from which the light incident thereto from the light-emitting element is output, wherein a part of the patterns correspond to a first area corresponding to the light-emitting element, and to a second area around the first area and are arranged at an angular range of 120 to 130 degrees on the surface of the molded part.