Accessory Controller Switch Module Injection Molding
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Solution Overview
Problem
Designing electronic device accessories with button controller and microphone assemblies that are not overly complex or costly while ensuring satisfactory reliability and performance is a challenge.
Innovation Solution
The solution involves a button controller with a switch module containing dome switches and a microphone, where the switches and electrical components are mounted within plastic structures formed using injection molding, with a printed circuit and cable strain relief structures integrated into the design to provide a reliable and efficient assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional assembly methods with separate components are used, then ease of manufacture is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple discrete components (switches, microphone, electrical components, and plastic housing) into an integrated injection-molded assembly. The switch terminals are formed by molding plastic around terminal structures, creating a unified component that reduces assembly steps and overall device complexity while maintaining manufacturing efficiency.
Solution Approach 2:
The injection-molded plastic structure serves multiple functions simultaneously: it provides structural housing, electrical insulation, mechanical support for switches and microphone, and integration medium for all components. This multi-functionality reduces the number of separate parts needed, thereby reducing device complexity.
2Device complexity
If integrated injection molding is used, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The injection molding process is divided into multiple sequential stages: first forming the plastic structure around switch terminal structures, then adding dome switch members, followed by mounting the printed circuit and microphone, and finally sealing with additional plastic layers. This segmentation of the molding process allows each stage to be optimized independently, managing precision requirements.
Solution Approach 2:
Switch terminal structures are pre-formed and positioned within the mold cavity before the injection molding begins. This preliminary positioning ensures precise placement of electrical terminals relative to the plastic housing, reducing the precision burden on the molding process itself while achieving accurate component alignment.
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 results in a cost-effective and reliable electronic device accessory with improved performance and durability, ensuring effective signal routing and user control through the use of dome switch members and injection-molded plastic structures.
Implementation Method 1
The plastic structures may be formed using injection molding operations. For example, switch terminals for the switches may be formed by molding plastic around switch terminal structures.
Data Source
AI summary
An accessory may be provided with a button controller having a microphone and switches. Plastic structures for the accessory may be formed by injection molding. Plastic structures may be molded around switch terminals. Switches may be formed using dome switch members and the switch terminals. A printed circuit with components may be mounted in the plastic structures. Recesses in the structures may be configured to receive the dome switch members, components on the printed circuit board, and wires in a cable. A backplate may be used to cover the printed circuit. A layer of plastic may be molded over the backplate to seal an interface created by the backplate. Cable strain relief structures may be molded into the layer of plastic. A lip on the strain relief structures may prevent particles from entering the controller.