Side Input Button Beam Sensing for Force and Location Detection
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Solution Overview
Problem
Existing portable electronic devices lack efficient input systems that can detect and respond to multiple force inputs, including varying force thresholds and locations, while maintaining simplicity and environmental scalability.
Innovation Solution
The implementation of an input button system with strain-sensing elements and a dome switch that detects force inputs, determines their location, and triggers different operations based on predefined force thresholds, accompanied by haptic actuators to provide tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If multiple separate input systems are used to detect different force inputs and locations, then detection capability is improved, but device complexity increases
Solution Approach 1:
The beam structure with strain sensing elements serves multiple functions: detecting force magnitude, determining force location, and triggering different operations based on the combination of force and location. This single multi-functional input system replaces what would traditionally require multiple separate sensors and switches, thereby improving detection capability while maintaining simplicity
Solution Approach 2:
The patent combines the force detection function and location detection function into a single integrated beam structure with strain sensing elements. By merging these functions into one component rather than using separate systems, the patent achieves comprehensive detection capability without proportionally increasing device complexity
2Device complexity
If a single input system is used for all operations, then device complexity is reduced, but detection precision for multiple force thresholds and locations deteriorates
Solution Approach 1:
The beam structure is divided into multiple segments with strain sensing elements positioned at different locations along the beam. Each segment and sensing element combination can detect specific force applications at different positions. This segmentation allows the single input system to precisely distinguish between forces applied at different locations and different magnitudes, maintaining high measurement precision while using a unified structure
Solution Approach 2:
Different strain sensing elements are positioned at specific locations on the beam structure to detect forces applied at corresponding positions. The beam structure itself has varying properties at different locations, with each section optimized to detect specific types of inputs. This local differentiation enables precise detection of both force magnitude and location using a single integrated system
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 devices to perform multiple operations in response to varying force inputs, including location-specific actions, enhancing user interaction without requiring separate input systems and providing customizable tactile outputs.
Implementation Method 1
a strain sensing element positioned on the beam structure and configured to detect strain on the beam structure as a result of the force input on the input member
Implementation Method 2
a dome switch configured to collapse in response to the force input satisfying a force threshold
Data Source
AI summary
An electronic device may include an input button system including an input member positioned along the side exterior surface of a housing component and configured to receive a force input, a beam structure at least partially within the enclosure, the beam structure configured to be deflected as a result of the force input on the input member, 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. The electronic device may further include a processing system configured to determine a region on the input member where the force input was applied using the strain sensing elements, and cause the electronic device to perform a first operation in response to detecting that the force input satisfies a first force threshold.