Electronic Device Housing Insert Molded Plastic Substrate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for an improved housing construct for electronic devices that is lighter, thinner, and maintains mechanical protection and integrity while accommodating additional components and features.
Innovation Solution
The solution involves a housing component that integrates multiple materials, including a metal housing, a plastic substrate, and a thermoplastic overlayer, where the plastic substrate is positioned within the metal housing before insert molding, and post-processing techniques are used to create complex mechanical features and channels for components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a thin metal housing is used to reduce weight and thickness, then the device becomes lighter and thinner, but the housing warps and bends during insert molding
Solution Approach 1:
A plastic substrate is introduced as an intermediary component between the metal housing and the thermoplastic overlayer. This plastic substrate prevents direct contact between the molten thermoplastic and the thin metal housing, thereby preventing warping and bending while still allowing the insert molding process to proceed
Solution Approach 2:
The housing is constructed as a composite structure combining metal and plastic materials. The metal housing provides structural strength and form, while the plastic substrate provides thermal isolation and prevents warping during molding. This composite approach allows the housing to be thin and light while maintaining shape stability
2Ease of manufacture
If traditional insert molding is used without a plastic substrate, then the manufacturing process is simpler, but the thin metal housing warps and bends
Solution Approach 1:
The plastic substrate is prepared and positioned within the metal housing before the insert molding process begins. This preliminary action prevents warping during molding, and the substrate can be pre-formed to accommodate complex mechanical features that will be created after molding
Solution Approach 2:
The plastic substrate serves as a mediator between the metal housing and the thermoplastic overlayer, preventing direct thermal contact that would cause warping. This intermediary component is standard industry practice for protecting thin metal housings during insert molding
3Ease of manufacture
If complex mechanical features are created through post-processing, then the features can be formed without expensive tooling, but additional processing steps are required
Solution Approach 1:
The plastic substrate is prepared in advance with predetermined geometric features that will become the complex mechanical features after molding. This preliminary preparation eliminates the need for expensive post-molding tooling, as the features are formed by removing material from the pre-prepared substrate
Solution Approach 2:
The plastic substrate acts as a disposable mold form that can be easily prepared and discarded. Instead of using expensive, complex tooling that would be needed to create the same features through traditional molding, the substrate is a simple component that can be readily manufactured and replaced
4Volume of moving object
If the housing is made thinner to accommodate smaller components, then the device form factor is reduced, but mechanical protection and integrity are compromised
Solution Approach 1:
The housing uses a composite construction where the metal housing provides structural strength and protection, while the plastic substrate provides additional mechanical support and protection during molding. This composite approach allows the housing to be thin while maintaining adequate mechanical protection
Solution Approach 2:
The plastic substrate is formed to conform to the interior surface of the metal housing, creating a curved, conformal interface that distributes mechanical stresses evenly throughout the thin housing structure, thereby maintaining integrity despite the reduced thickness
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 approach prevents warping and bending of thin metal housings during insert molding, allows for the creation of complex snap features without expensive tooling, and enables the design of electronic devices with extremely small form factors while maintaining mechanical integrity.
Implementation Method 1
a thermoplastic material is heated to a molten state
Implementation Method 2
then cooled to a solid state
Data Source
AI summary
A component for an electronic device include a housing and a plastic substrate. The plastic substrate is disposed in, and adjacent to, the housing, A thermoplastic overlayer is insert molded into the housing. The plastic substrate is disposed between the housing and the thermoplastic overlayer after the insert molding. The plastic substrate and the thermoplastic overlayer can share at least one common incision penetrating the thermoplastic overlayer and at least partially penetrating the plastic substrate.