Dual-Force Push Trigger With Haptic Feedback for Reliable Activation
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Solution Overview
Problem
Existing two-function triggers often result in unintended activation of primary functions due to inconsistent force application, leading to a poor user experience and potential false rejections in biometric authentication.
Innovation Solution
A two-function trigger system with a first force sensor for primary functions and a second force sensor for secondary functions, accompanied by tactile or haptic feedback, ensuring consistent force application and preventing inadvertent activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single button combines multiple functions, then device complexity is reduced and ease of operation is improved, but reliability deteriorates due to inadvertent activation of primary functions
Solution Approach 1:
The patent applies parameter changes by utilizing different force magnitude parameters to distinguish between secondary function activation (lower force threshold) and primary function activation (higher force threshold). This allows a single button to reliably differentiate between user intentions based on the applied force parameter, preventing inadvertent activation while maintaining ease of operation.
Solution Approach 2:
The patent implements feedback through a feedback circuit that provides tactile or haptic feedback when the second force threshold is reached. This feedback mechanism guides users to apply the appropriate force level for secondary functions, reducing inadvertent primary function activation and improving overall system reliability.
2Ease of operation
If force threshold for secondary function is set lower, then ease of operation is improved, but reliability deteriorates due to inadvertent primary function activation
Solution Approach 1:
The patent resolves this contradiction by establishing two distinct force threshold parameters: a second force threshold for secondary function activation (easier to reach) and a first force threshold for primary function activation (harder to reach). This parameter differentiation ensures that lower force application triggers secondary functions while higher force application is required for primary functions, eliminating inadvertent activation.
Solution Approach 2:
The patent segments the force activation range into two distinct zones: a lower force zone for secondary functions and a higher force zone for primary functions. This segmentation of the force parameter space allows each function to have its own activation threshold, enabling easy access to secondary functions while protecting primary functions from inadvertent activation.
3Reliability
If force threshold for primary function is set higher, then reliability is improved by preventing inadvertent activation, but ease of operation deteriorates
Solution Approach 1:
The patent applies parameter changes by setting the first force threshold (for primary functions) higher than the second force threshold (for secondary functions). This parameter configuration ensures that primary functions require deliberate strong pressure, improving reliability, while secondary functions remain easily accessible with lighter pressure.
Solution Approach 2:
The patent segments the operational force range into two distinct segments: a lower segment for secondary functions that is easy to activate, and a higher segment for primary functions that requires deliberate action. This segmentation resolves the contradiction by making each function type optimally accessible within its own force range.
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
Enhances user experience by providing clear feedback for correct force application, reducing unintended activations and improving biometric authentication reliability.
Implementation Method 1
a first force sensor mechanically coupled to the contact and configured to actuate a first function when a first force threshold is reached or exceeded
Implementation Method 2
a second force sensor coupled to the contact and configured to actuate a second function through the control circuit when a second force threshold is reached, the second force threshold less than the first force threshold
Implementation Method 3
A tactile or haptic feedback may be provided when the second force is detected to alert the user that the desired force for secondary function activation has been used
Data Source
AI summary
A two-function push trigger is disclosed. In one aspect, the trigger includes a first switch, which may be mechanical in nature and may be considered a first force sensor, that activates a primary function when a first force is applied, along with a second force sensor that activates a secondary function when a second force less than the first force is applied. A tactile or haptic feedback may be provided when the second force is detected to alert the user that the desired force for secondary function activation has been used. By providing this second sensor and feedback, users may avoid inadvertent application of too much force and avoid unintended primary function activation.