Electronic Device Case with Integrated Shielding via In-Mold Decoration
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Solution Overview
Problem
The existing manufacturing processes for electronic device cases are complex and time-consuming, leading to increased defective rates and costs due to separate processing of the plastic case body and electromagnetic shielding layer.
Innovation Solution
A method involving vacuum formed films and in-mold decoration injection molding, where an electromagnetic shielding layer is formed on a vacuum formed film using electroplating, evaporation, or sputtering processes, and integrated with the case body during injection molding to simplify the process and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate processing steps are used for the plastic case body and electromagnetic shielding layer, then the quality of each component can be ensured, but the manufacturing process becomes complex and time-consuming
Solution Approach 1:
The patent combines the plastic case body and electromagnetic shielding layer into a single integrated structure by forming the metal layer directly on the plastic case body during injection molding. This merging of components eliminates separate assembly steps, reduces process complexity, and maintains quality through integrated manufacturing.
Solution Approach 2:
The electromagnetic shielding layer is formed in advance during the injection molding process itself, before final assembly. The metal foil or powder is prepared and positioned within the mold cavity, and the plastic material is injected to encapsulate it, creating a pre-integrated structure that eliminates subsequent assembly operations.
2Reliability
If multiple separate processing steps are used for case manufacturing, then component quality can be maintained, but production time increases
Solution Approach 1:
The patent merges multiple manufacturing operations into a single injection molding cycle. The plastic case body and electromagnetic shielding layer are formed simultaneously in one process step, eliminating the need for separate processing and assembly operations, thereby dramatically reducing manufacturing cycle time.
Solution Approach 2:
The injection molding process continues uninterrupted to form both the plastic case body and encapsulate the electromagnetic shielding layer. The metal foil or powder is positioned in the mold cavity, and the plastic material is injected continuously to create the integrated structure without stopping or requiring additional processing steps.
3Manufacturing precision
If separate processing steps are used for case body and electromagnetic shielding layer, then manufacturing precision can be controlled, but manufacturing cost increases
Solution Approach 1:
The patent combines the manufacturing of the plastic case body and electromagnetic shielding layer into a single integrated process. This eliminates multiple processing steps, reduces the need for separate quality control operations, and lowers manufacturing costs through process simplification and reduced labor requirements.
Solution Approach 2:
The injection molding process is made multi-functional by simultaneously forming the plastic case body and integrating the electromagnetic shielding layer. This universal process approach eliminates the need for separate specialized equipment and operations for each component, reducing overall manufacturing complexity and cost.
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 significantly simplifies the manufacturing process, reduces production time, and lowers costs by integrating the electromagnetic shielding layer and external surfaces in a single in-mold decoration injection molding step.
Implementation Method 1
a vacuum formed film is formed on a first mold
Implementation Method 2
the method of forming the electromagnetic shielding layer includes an electroplating process
Implementation Method 3
the method of forming the electromagnetic shielding layer includes an evaporation process
Implementation Method 4
the method of forming the electromagnetic shielding layer includes a sputtering process
Implementation Method 5
an in-mold decoration injection molding process is performed to form a case body between the second surface and the patterned film
Data Source
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Figure 7
AI summary
A method for manufacturing a case (200) of an electronic device includes the following steps. First, a vacuum formed film (210a) is formed on a first mold (100), and the vacuum formed film (210a) has a first surface (214) and a second surface (216). Then, an electromagnetic shielding layer (220) is formed on the first surface (214). Afterwards, a patterned film (300) and the vacuum formed film (210a) are provided in the second mold (400), and an in-mold decoration injection molding process is performed to form a case body (200) between the second surface (216) and the patterned film (300).