Button Integration for Electronic Devices
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Solution Overview
Problem
In portable electronic devices, the integration of user interface features like buttons with fastening systems can lead to space constraints, compromising the sealing of components and the placement of user interface elements, particularly due to competition for space around the device's periphery.
Innovation Solution
A button assembly is designed with a tactile switch, a polymeric film welded to the switch body with gaps that allow air passage while preventing liquid ingress, and a button bracket with a snap clip for securing components, ensuring proper sealing and user interface functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fastening systems are distributed around the interface between components to secure the device, then the structural integrity and sealing are improved, but the available space for user interface elements is reduced
Solution Approach 1:
The button assembly is integrated directly into the peripheral housing structure, combining the user interface element with the structural component. The button cap, switch body, and housing form a unified assembly where the button serves both as a user interface element and as part of the structural perimeter, eliminating the need for separate fastening systems that would compete for space.
2Volume of stationary object
If components are tightly spaced to accommodate more functions within a small form factor, then the device size is reduced, but the proper sealing of components becomes difficult
Solution Approach 1:
The button assembly is nested within the peripheral housing structure, with the button cap positioned within an opening in the display cover, the switch body mounted to the housing, and the polymeric film welded to create sealed chambers. This nested configuration allows multiple components to occupy overlapping or concentric spaces, achieving compact integration while maintaining proper sealing through the welded polymeric film barriers.
3Object-affected harmful factors
If a polymeric film is welded completely around the tactile switch to prevent liquid ingress, then the liquid protection is improved, but air trapped inside cannot escape causing potential damage
Solution Approach 1:
The polymeric film is welded to the switch body in a pattern that creates a porous or semi-permeable barrier. The weld pattern includes intentional gaps or porous regions that allow air molecules to pass through while the overall structure maintains liquid blocking capability. This selective permeability allows air exchange while preventing liquid ingress, resolving the contradiction between complete sealing and air venting.
4Volume of stationary object
If button assembly components are integrated into the peripheral housing to save space, then the device compactness is improved, but the placement of user interface elements in convenient positions becomes restricted
Solution Approach 1:
The button assembly utilizes the third dimension (depth) by positioning the button cap within an opening in the display cover while the switch body extends into the device interior. This vertical integration allows the button to be accessible from the front surface while the mechanical components are compactly arranged in the depth direction, maintaining ergonomic accessibility without increasing the device's footprint.
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 solution effectively integrates user interface features into space-constrained devices, maintaining device sealing and functionality by allowing air exchange while preventing liquid entry, thus addressing the challenges of tight spacing and component competition for space.
Implementation Method 1
The polymeric film is welded to the switch body by a weld that defines a number of gaps that allow air to pass into and out of an interior volume defined by the switch body and the polymeric film without allowing liquids to enter the interior volume through a joint formed by the weld.
Data Source
AI summary
This application relates to various button related embodiments for use with a portable electronic device. In some embodiments, a snap clip can be integrated with a button bracket to save space where two separate brackets would take up too much space in the portable electronic device. In other embodiments, a tactile switch can be waterproofed by welding a polymeric layer atop a tactile switch assembly. In this way water can be prevented from contacting moisture sensitive components of the tactile switch assembly. The weld joining the polymeric layer to the tactile switch can include at least one gap to trapped gas surrounding the tactile switch assembly to enter and exit during heat excursions caused by various operating and/or assembly operations.