Mouse Wheel Force Sensing for Sealed Virtual Freewheeling
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Solution Overview
Problem
Existing computer mouse switches that rely on ohmic contact for operation are prone to failure due to grime, water, and require physical movement, lacking multi-level displacement sensing and tactile feedback, and capacitive touch sensing can fail with gloves.
Innovation Solution
A switch mechanism using inductive or Hall effect sensors to detect force and displacement without ohmic contact, providing tactile feedback and enabling multi-level displacement sensing, sealed from external elements, and capable of virtual freewheeling functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ohmic contact switches are used for mouse wheel detection, then tactile feedback and switching action are achieved, but reliability deteriorates due to grime and water affecting the contact
Solution Approach 1:
The patent replaces ohmic contact-based mechanical switching with inductive sensing. The inductive sensor detects the position and movement of the mouse wheel through magnetic field interactions without requiring physical contact between electrical components, thereby eliminating the harmful effects of grime and water on switch reliability.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the user's mechanical input on the mouse wheel and the electronic detection system. The inductive sensor uses magnetic field changes to detect wheel position and movement, allowing the system to sense user input without direct electrical contact that would be affected by contaminants.
2Measurement precision
If dome switches with single make-point are used, then tactile feedback is provided, but multi-level displacement information cannot be obtained
Solution Approach 1:
The patent employs an inductive sensor that continuously tracks the dynamic position of the mouse wheel across multiple displacement levels. Unlike fixed make-point dome switches, the inductive sensing system can detect incremental changes in wheel position, providing multi-level displacement information while maintaining a relatively simple overall structure.
3Ease of operation
If capacitive touch sensing is used for wake-up function, then user interaction detection is enabled, but functionality deteriorates when user wears gloves
Solution Approach 1:
The patent replaces capacitive touch sensing with inductive sensing for wake-up detection. Inductive sensors can detect the presence and movement of ferromagnetic materials (such as those in gloves or the mouse wheel itself) through magnetic field interactions, making the wake-up function reliable regardless of whether the user is wearing gloves or not.
4Reliability
If inductive sensors are used for force detection, then reliability is improved by sealing from external elements, but device complexity increases
Solution Approach 1:
The patent implements an inductive sensing system that serves multiple functions: detecting mouse wheel position, measuring user applied force, and enabling wake-up detection. This multi-functional approach allows the system to achieve reliable sealed operation without proportionally increasing complexity, as the same sensor mechanism handles multiple detection tasks.
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 reliability and functionality by detecting subtle user interactions, including touch and force, and enabling virtual freewheeling without physical rotation, unaffected by environmental factors like grime or gloves.
Implementation Method 1
A switch based on this principle offers the benefit that moving parts can be totally sealed from the electronics or external circuitry because no circuitry connections are required, and multi level displacement or multi point movement measurements can be made.
Implementation Method 2
For a Hall effect sensor a magnet is required and the Hall effect sensor can be used to determine a distance between the sensor and the magnet.
Data Source
AI summary
A method of measuring wheel parameters of a user interface and using such information to implement a freewheeling (virtual rotation) output that operates independent of real rotation of the wheel. A specific application can be found in computer mouse products.