Flexible Circuit Buzzer Using Conductive Vias
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Solution Overview
Problem
The existing methods for electrically coupling speakers or buzzers to flexible circuits in medical devices face challenges such as heat damage, contamination, and uneven solder joints, which increase costs, assembly time, and manufacturing defects.
Innovation Solution
The use of conductive vias plated within holes in the flexible circuit dielectric layers to electrically couple the buzzer directly to the conductive layer, eliminating the need for soldering and reducing assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soldering is used to electrically couple the buzzer to the flexible circuit, then electrical connection is achieved, but heat damage to the dielectric and contamination occur
Solution Approach 1:
The patent replaces the thermal soldering process with a mechanical insertion process. The buzzer is positioned and electrically coupled to the flexible circuit through conductive elements without applying heat, thereby eliminating heat damage to the dielectric and contamination from flux while maintaining reliable electrical connection.
Solution Approach 2:
The patent introduces conductive vias and conductive elements as intermediary components between the buzzer and the flexible circuit. These intermediaries provide the electrical connection pathway without requiring direct soldering to the flexible circuit traces, thus avoiding the harmful effects of heat and flux on the dielectric layers.
2Reliability
If soldering is used to electrically couple the buzzer to the flexible circuit, then electrical connection is achieved, but cleaning steps are required adding cost and time
Solution Approach 1:
The patent replaces the thermal soldering process with a mechanical insertion and lamination process. The buzzer is positioned on the flexible circuit and secured through lamination without soldering, thereby eliminating the need for cleaning steps and reducing both assembly time and manufacturing cost while maintaining reliable electrical connection.
Solution Approach 2:
The patent employs a self-aligning and self-securing mechanism where the buzzer is positioned on the flexible circuit and automatically secured through the lamination process. The conductive elements and vias are designed to provide both electrical connection and mechanical retention without requiring additional soldering or cleaning operations.
3Reliability
If soldering is used to electrically couple the buzzer to the flexible circuit, then electrical connection is achieved, but uneven surfaces result causing lamination difficulties
Solution Approach 1:
The patent replaces the soldering process with a lamination-based electrical coupling method. The buzzer is positioned on the flexible circuit and secured through lamination without creating raised or sunken solder joints. This approach maintains a flat, even surface that prevents lamination difficulties and delamination issues while achieving reliable electrical connection through the conductive vias and elements.
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 reduces assembly time, costs, and manufacturing defects by avoiding soldering, while ensuring robust electrical coupling and insulation of the buzzer within the flexible circuit.
Implementation Method 1
plating the hole and the first contact to form a conductive via, the conductive via electrically coupling the first conductive layer to the first contact
Data Source
AI summary
This document discusses, among other things, systems and methods related to a flexible circuit buzzer apparatus, such as a buzzer apparatus for use in an implantable medical device. In an example, the buzzer apparatus can include a flexible circuit having a first dielectric layer. A conductive layer can be disposed on the first dielectric layer. A hole can be formed in the first dielectric layer, the conductive layer, or both. A buzzer including a first contact can be located proximate to the hole. A conductive via can be plated or deposited in the hole. At least the first contact can be electrically coupled to the conductive layer by the conductive via.