Handheld Input Button Assembly With Strain-Based Region Detection
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Solution Overview
Problem
Existing electronic devices lack efficient mechanisms for distinguishing between different input regions on a single input member and providing nuanced user inputs and haptic feedback, limiting their functionality and user experience.
Innovation Solution
Incorporating a beam structure with strain sensing elements and a haptic actuation system, where deflection of the beam is determined by user input location, allowing for differentiated actions and enhanced haptic feedback through electromagnetic attraction to a ferromagnetic structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single input member is used without regional differentiation, then the device structure remains simple, but the input functionality and user interaction precision are limited
Solution Approach 1:
The input member is segmented into multiple input regions (first input region and second input region) along its length. Each region can be independently actuated and detected, enabling differentiated functionality (e.g., volume up, volume down, play/pause) while using a single continuous physical component. This segmentation approach increases adaptability without requiring multiple separate buttons.
Solution Approach 2:
Different portions of the input member are assigned different functional qualities. The first input region and second input region have different local characteristics that enable them to perform different functions. The beam structure also has varying compliance characteristics at different locations to facilitate localized actuation and detection.
2Measurement precision
If strain sensing elements are placed at multiple locations on the beam structure, then input location detection precision improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The beam structure is divided into segments with strain sensing elements positioned at specific locations (first location and second location). This segmentation allows the system to detect which segment is being actuated, providing input location precision. The segmented approach enables differentiated detection without requiring a complete redesign of the input mechanism.
Solution Approach 2:
The patent replaces complex mechanical switching mechanisms with a strain-based sensing system. Instead of using mechanical contacts or switches that would require precise alignment and multiple moving parts, the system uses strain sensing elements that detect deformation in a continuous beam structure, simplifying the overall system while maintaining or improving detection precision.
3Ease of operation
If haptic actuation is added to provide tactile feedback, then user interaction quality improves, but the device complexity and energy consumption increase
Solution Approach 1:
The patent replaces traditional mechanical haptic actuators (such as vibration motors or solenoids) with an electromagnetic actuation system that uses a conductive coil and ferromagnetic beam structure. This substitution enables haptic feedback through magnetic attraction/repulsion forces, reducing mechanical complexity while providing effective tactile feedback. The electromagnetic system can be integrated directly with the existing beam structure.
Solution Approach 2:
The haptic actuation system changes the physical state or properties of the beam structure dynamically. By varying the electromagnetic field strength, the system can control the degree of beam deflection and the resulting haptic feedback. This parameter-based control allows for nuanced tactile responses without requiring complex mechanical actuation mechanisms.
4Measurement precision
If the beam structure is made more compliant to enable precise deflection detection, then sensing accuracy improves, but the structural strength and durability may be compromised
Solution Approach 1:
The beam structure has non-uniform compliance characteristics - different portions of the beam have different stiffness properties. The beam is designed to be more compliant in regions where deflection detection is needed (to enhance sensing accuracy) while maintaining adequate strength in load-bearing regions. This local variation in mechanical properties allows the beam to satisfy both sensing and structural requirements simultaneously.
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
Enables precise determination of input location and gesture detection, enabling varied device responses and improved haptic feedback, enhancing user interaction and functionality.
Implementation Method 1
the haptic actuation system may include a conductive coil coupled to the beam structure, and the haptic actuation system may energize the conductive coil to cause the beam structure to be deflected towards a ferromagnetic structure
Implementation Method 2
a first strain sensing element at a first location of the beam structure, and a second strain sensing element at a second location of the beam structure
Data Source
AI summary
An electronic device may include an input button assembly including an input member positioned along a side exterior surface of a housing component and defining a first input region proximate a first end of the input member and a second input region proximate a second end of the input member, the input member configured to receive a user input. The input button assembly may further include a beam structure at least partially within the enclosure and coupled to the input member, the beam structure configured to be deflected as a result of the user input, a first strain sensing element at a first location of the beam structure, and a second strain sensing element at a second location of the beam structure.