Decorative Functional Component Transparent Partial Surface
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Solution Overview
Problem
Existing decorative and functional components with transparent surfaces face mechanical stresses due to material bonding, which can impair optical properties and make the viewing window recognizable, especially when used in front of displays.
Innovation Solution
The plastic carrier and cover body are joined with a loose form fit and coated with a low-viscosity transparent plastic, allowing for a tension-free connection and subsequent over-injection with a transparent elastic material to conceal the separate arrangement optically and prevent mechanical stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the viewing window is enclosed in the housing using a tongue-and-groove joint with material bonding, then fluid-tight sealing is achieved, but mechanical stresses are generated that affect the optical properties of the viewing window
Solution Approach 1:
The functional component is divided into multiple independent parts: the housing (first component) and the viewing window (second component). These components are kept mechanically decoupled through a loose form-fit connection, allowing each to maintain its own structural integrity without transmitting stresses to the other. This segmentation resolves the contradiction by enabling sealing through the loose fit without creating stress bonds that would degrade optical properties.
Solution Approach 2:
A loose form-fit connection acts as an intermediary between the housing and viewing window. This intermediate connection provides fluid-tight sealing while deliberately avoiding rigid material bonding, thus preventing the transmission of mechanical stresses to the viewing window. The loose fit serves as a mediator that achieves sealing functionality without the harmful side effect of stress-induced optical degradation.
2Productivity
If a two-component injection-molded part is used to create a viewing window in a housing, then manufacturing efficiency is improved, but mechanical stresses are unavoidable which affect the optical properties
Solution Approach 1:
Instead of creating a monolithic two-component injection-molded part, the invention segments the housing and viewing window into separate components that are assembled through a loose form-fit connection. This segmentation allows for efficient manufacturing of individual components while avoiding the stress-generating material bonding inherent in traditional two-component injection molding, thus maintaining productivity without the harmful mechanical stresses.
Solution Approach 2:
The viewing window is extracted as a separate component from the housing structure, rather than being integrally molded as a two-component part. This extraction allows the viewing window to be manufactured independently and assembled with the housing through a loose fit, eliminating the unavoidable mechanical stresses that arise from material bonding in conventional two-component injection molding while preserving manufacturing efficiency.
3Object-affected harmful factors
If the viewing window is made as a separate component with loose form fit, then mechanical stresses are prevented, but the separate arrangement becomes visually recognizable
Solution Approach 1:
The housing and viewing window, though mechanically decoupled through loose form fit, are merged into a unified visual appearance. The design integrates the separate components so seamlessly that their individual boundaries are not visually distinguishable, achieving a homogeneous aesthetic appearance while maintaining the stress-free loose connection between components.
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
This solution mechanically decouples the components, preventing mechanical stresses and ensuring the optical properties are preserved while concealing the multi-part design, thus enhancing the functionality and aesthetics of the functional component.
Implementation Method 1
coated together with a low-viscosity curing transparent plastic by flooding
Data Source
Figure 1~2b
Figure 3a~3c
Figure 4a~4d
AI summary
Described is a decorative functional component having a transparent partial surface, having a plastic substrate that is made of a first plastic material and has a recess, and a flat covering body that is made of a transparent second plastic material and covers or fills the recess of the plastic substrate, wherein the plastic substrate and the covering body are joined by a loose locking fit and are jointly coated, by flooding, with a low-viscosity curing transparent plastic.