Rearview Housing RF Bonding for Quiet Assembly
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Solution Overview
Problem
Traditional rearview assembly manufacturing methods face challenges with mechanical fasteners and adhesives, which can lead to issues like buzz, squeak, and rattling, and lack sufficient durability or ease of application.
Innovation Solution
A method using a radio frequency (RF) activated bonding process where a bonding material is applied between the front and rear housings, and RF energy is applied to cure the material, eliminating the need for mechanical fasteners and providing a strong, durable bond.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical fasteners or adhesives are used to bond front and rear housings, then assembly is achieved, but buzz, squeak, and rattling occur and durability is insufficient
Solution Approach 1:
The patent replaces mechanical fasteners (screws, clips) and chemical adhesives with a thermal bonding process. The front and rear housings are thermally bonded together through heating, eliminating the need for mechanical or chemical bonding agents that cause noise and reliability issues.
Solution Approach 2:
The patent changes the physical state of the bonding interface by controlling temperature parameters. The housings are heated to a specific temperature range to enable thermal bonding, then cooled to maintain the bond. This parameter-based approach replaces traditional bonding methods with temperature-controlled material behavior changes.
2Ease of manufacture
If traditional bonding methods are used, then assembly is achieved, but tooling complexity and component costs increase
Solution Approach 1:
The patent extracts and eliminates the need for separate bonding agents, fasteners, and complex tooling systems. By using direct thermal bonding of the housing materials themselves, the process removes intermediate bonding components and simplifies the tooling required, reducing overall manufacturing complexity.
3Strength
If energy is applied to cure bonding material, then strong bond is achieved, but energy consumption increases
Solution Approach 1:
The patent applies energy locally only to the bonding interface between the front and rear housings rather than heating the entire assembly. This localized thermal bonding approach concentrates energy where needed to create the bond while minimizing overall energy consumption compared to bulk heating or curing methods.
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
The RF activated bonding process ensures a secure and quiet assembly with reduced tooling complexity, lower component piece prices, and minimized energy consumption, while also addressing concerns related to radio frequency/electromagnetic interference shielding.
Implementation Method 1
The bonding material is configured to set upon application of energy to the peripheral channel after the front housing and the rear housing have been engaged
Data Source
AI summary
A method of making a rearview assembly includes operably coupling a rearview device with a front housing. A bonding material is applied to the front housing and a printed circuit board is operably coupled with the front housing. A rear housing is engaged with the front housing. Energy is applied to bond the front housing with the rear housing.