Rearview Button with Fulcrum Lever for Accidental Activation Prevention
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Solution Overview
Problem
Existing rearview assemblies lack an intuitive and ergonomic design for actuating buttons, making it difficult to activate functions without accidental activation, especially when adjusting the reflected surface or display image.
Innovation Solution
A rearview assembly with buttons that have a proximal end adjacent to the rearview device and a distal portion spaced from it, featuring a connecting member as a fulcrum, allowing force application at the distal portion to actuate the button and activate functions with decreasing requisite force, and a switch assembly with switches at the distal portion for activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If buttons are disposed close to the rearview device for compact design, then device complexity is reduced, but accidental activation becomes more likely during adjustment
Solution Approach 1:
The button features non-uniform force distribution along its length, with the distal portion requiring less actuation force than the proximal portion. This local quality variation ensures that only deliberate pressing at the distal end activates the function, while accidental contact elsewhere does not trigger activation.
Solution Approach 2:
A connecting member acts as an intermediary between the button and the switch. It includes a fulcrum that creates a lever mechanism, where force applied at the distal portion of the button is amplified to actuate the switch, while force applied at the proximal end is not sufficient to activate it.
2Reliability
If buttons require high actuation force, then accidental activation is prevented, but ease of operation deteriorates
Solution Approach 1:
The connecting member with fulcrum acts as a mechanical advantage system. It allows a small force applied at the distal portion of the button to be amplified into a larger force at the switch, making the button easy to press while still preventing accidental activation through the asymmetric force distribution.
Solution Approach 2:
The system changes the force parameter along the length of the button, creating a gradient where the distal portion has lower actuation force requirements than the proximal portion. This parameter variation enables easy deliberate activation while maintaining protection against accidental activation.
3Device complexity
If buttons are positioned at the proximal end for compact design, then device complexity is reduced, but intuitive operation becomes difficult
Solution Approach 1:
The button is designed with different functional zones: the distal portion is optimized for user interaction with lower actuation force, while the proximal portion serves as the structural attachment point. This local differentiation makes the button intuitive to operate while maintaining a compact overall structure.
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 design provides an intuitive and ergonomic solution for actuating buttons, reducing the risk of accidental activation and enhancing user interaction by requiring force application at the distal portion, thus improving usability and functionality.
Implementation Method 1
A connecting member generally defines a fulcrum that is operably coupled with the button adjacent the proximal end of the button. Application of force to the distal portion facilitates actuation of the button
Data Source
AI summary
A rearview assembly includes a housing configured to support a rearview device. A button is disposed on a side of the housing and includes a proximal end adjacent the rearview device. A distal portion is spaced from the rearview device. A switch is proximate the distal portion of the button. Actuation of the switch activates a function of the rearview device. The requisite force to actuate the button decreases as the force is moved from the proximal end of the button to the distal portion. The switch is in abutting contact with the housing at the proximal end and is spaced from the housing by a gap at the distal portion.