Resin Package Cavity with Curved Stepped Surface for Light Reflection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light emitting devices with resin packages face challenges in efficiently reflecting light emitted by the light emitting element due to the design of the reflecting surface, which affects the light's incident efficiency onto a light guide plate and the appearance around the light entrance.
Innovation Solution
A resin package design featuring a molded resin housing with a cavity that includes a curved and stepped portion, where the first lead has an elevated portion for mounting the light emitting element, allowing for improved light reflection and increased luminosity by positioning the light emitting element higher than the stepped portion, and the second lead is exposed from the housing for efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional reflecting surface design is used in the resin package, then the structure is simple, but the light incident efficiency onto the light guide plate is reduced and the appearance around the light entrance is degraded
Solution Approach 1:
The cavity's inner surface is segmented into distinct functional zones: a curved portion for light reflection, a stepped portion for positioning, and a bottom portion for lead mounting. This segmentation allows each zone to optimize its specific function, improving overall light incident efficiency while maintaining manageable structural complexity
Solution Approach 2:
Different regions of the cavity inner surface are given different geometric properties tailored to their specific functions. The curved portion has a specific radius of curvature optimized for light reflection, the stepped portion provides precise positioning for the light emitting element, and these local variations in geometry enhance light incident efficiency without requiring complete redesign of the entire cavity
2Illumination intensity
If the light emitting element is positioned at a lower height, then the device structure is simpler, but the light emission direction and luminosity are suboptimal
Solution Approach 1:
The first lead is designed with an elevated portion that extends vertically upward from the bottom portion of the cavity, creating a height dimension that positions the light emitting element at an optimized elevation. This vertical dimensioning allows the light emitting element to be positioned higher without increasing horizontal complexity, improving luminosity and light emission direction
Solution Approach 2:
The elevated portion of the first lead is pre-formed during the molding process to provide the optimal mounting height for the light emitting element before the element is actually installed. This preliminary structuring ensures correct positioning is built-in from the start, avoiding the need for additional height-adjustment mechanisms
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 enhances light reflection and incident efficiency onto a light guide plate, improving the appearance and functionality of the light emitting device by ensuring the light is emitted in a desired direction with increased luminosity and efficient heat dissipation.
Implementation Method 1
a reflecting surface of the opening is curved... The inner surface includes a curved portion... enhances light reflection and incident efficiency
Implementation Method 2
the second lead is exposed from the housing for efficient heat dissipation
Data Source
AI summary
A resin package includes a molded resin housing, a first lead, and a second lead. The molded resin housing includes a cavity open upward. The cavity includes an inner surface. The inner surface includes a curved portion and a stepped portion provided on a lower side of the curved portion. The first lead and the second lead are provided in a bottom portion of the cavity such that at least a part of the first lead and the second lead is exposed from the molded resin housing. The first lead includes an elevated portion on which a light emitting element is mounted. An upper surface of the elevated portion is provided higher than an upper end portion of the stepped portion.