Optoelectronic Housing Segmented Plastic for Contrast
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Solution Overview
Problem
Conventional pre-packaged leadframe designs for optoelectronic components made from white, reflective thermoplastic materials lack satisfactory optical properties, particularly in video displays, leading to low contrast between light points and the housing surface, and are prone to color inhomogeneities and paint peeling under environmental conditions.
Innovation Solution
A housing with a plastic base body formed from two distinct plastic components, where the second component on the front side differs in optical properties due to added dye or reflection-increasing fillers, enhancing contrast and reflectivity, and produced using a two-component injection molding method, with electrical connection conductors enclosed and a reflector-like depression for the mounting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white, reflective thermoplastic material is used for the plastic base body, then the reflectivity of the housing surface is improved, but the contrast between light points and the surrounding housing surface deteriorates
Solution Approach 1:
The housing surface is segmented into multiple regions with different optical properties: a first region with high reflectivity (white filler) and a second region with low reflectivity (black dye) surrounding the light points. This segmentation allows each region to perform its specific optical function independently, resolving the contradiction between overall reflectivity and local contrast.
Solution Approach 2:
Different optical properties are applied to different locations on the housing surface. The central region has high reflectivity to maximize overall light output, while the peripheral regions have low reflectivity to enhance contrast for light points. This local differentiation of material properties resolves the contradiction by optimizing each area for its specific function.
2Reliability
If black ink is printed on the plastic base body surface to increase contrast, then the contrast between light points and housing surface is improved, but color stability and resistance to peeling deteriorate
Solution Approach 1:
Instead of using a separate ink layer that can peel, the housing is made from a composite material where the low-reflectivity regions are integrated into the plastic base body itself through black dye and encapsulating resin. This composite structure eliminates the interface between separate layers, preventing peeling while maintaining color stability and contrast.
Solution Approach 2:
The low-reflectivity pattern is created by selectively applying black dye and encapsulating resin to form the desired housing features directly in the molding process, rather than printing ink on the surface. This creates a permanent, integrated copy of the desired pattern that is structurally part of the housing.
3Reliability
If a two-component injection molding method is used to produce the plastic base body, then the optical properties and contrast are improved, but the manufacturing complexity increases
Solution Approach 1:
The two-component injection molding process combines the formation of the plastic base body and the optical functional areas (with different reflectivity) into a single integrated manufacturing step. The first component forms the structural base body, and the second component forms the optical functional areas with specific reflectivity properties, merging structure and optical function in one process.
Solution Approach 2:
The optical functional areas are formed during the molding process itself, before the housing is assembled or painted. The black dye and encapsulating resin are injected and cured in place, creating the low-reflectivity regions as an integral part of the housing structure, eliminating subsequent painting or coating steps.
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 achieves improved optical properties by increasing contrast and reflectivity, reducing the risk of color instability and peeling, resulting in a more effective and durable optoelectronic component housing.
Implementation Method 1
an increase in contrast can advantageously be achieved by adding black dye
Implementation Method 2
The reflectivity of the front surface of the plastic base body can advantageously be increased by adding white filler
Data Source
Figure 1~2
AI summary
A housing for an optoelectronic component (1) comprising a plastic basic body (5) having a front side (6) with a mounting region for at least one radiation-emitting or radiation-detecting body (2) is disclosed, wherein the plastic basic body (5) is formed from at least one first plastic component (51) and at least one second plastic component (52) wherein the second plastic component (52) is arranged at the front side (6) of the plastic basic body (5), is formed from a material which differs in terms of at least one optical property from the material of the first plastic component (51) and forms an optical functional region of the plastic basic body (5). A method for producing a housing for an optoelectronic component and a light-emitting diode component are furthermore disclosed.