Analog Keyboard Switch With Dual Travel and Force Sensing
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Solution Overview
Problem
Contemporary analog keyboards face challenges with increased production costs, system complexity, and poor detection characteristics due to inertia and lack of precise force feedback, limiting their performance in applications requiring accurate key press detection.
Innovation Solution
A key structure with a depressible plunger and dual sensing sections, including a first range of motion detection and a second force-sensitive range, utilizing a single inductive coil or dual orthogonally oriented PCBs to enhance sensitivity and linearity, allowing for precise travel and force detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If analog keys are used to provide better resolution in key press detection, then measurement precision is improved, but device complexity and production cost increase significantly
Solution Approach 1:
The patent combines travel detection and force detection into a single integrated switch assembly. The first sensor detects plunger travel position while the second sensor detects force applied to the dampening element, and both sensors are integrated within the same switch structure rather than using separate analog key assemblies, thereby reducing overall system complexity while maintaining high measurement precision
Solution Approach 2:
The single switch assembly performs multiple functions: it detects both the travel distance of the plunger and the force applied during key press. This multi-functional design eliminates the need for separate specialized sensors for each measurement type, reducing device complexity while achieving analog-level detection precision for both position and force
2Measurement precision
If analog keys are used to extend detection beyond simple make or break connection, then measurement precision is improved, but production cost increases significantly
Solution Approach 1:
The patent merges digital switch technology with analog sensing capabilities into a single hybrid assembly. By integrating both travel detection and force detection sensors within one switch unit, the design achieves analog-level measurement precision while using standardized digital components that can be manufactured using conventional PCB and sensor assembly processes, thereby controlling production costs
3Device complexity
If traditional sensors are used for key detection, then device complexity is kept low, but detection characteristics become poor due to inertia and lack of precise force feedback
Solution Approach 1:
The patent segments the detection function into two independent sensor systems: a first sensor for travel detection and a second sensor for force detection. This segmentation allows each sensor to be optimized for its specific measurement type, improving overall detection reliability and eliminating the inertial limitations of single-sensor systems while maintaining a relatively simple overall structure
Solution Approach 2:
The dampening element serves as an intermediary between the plunger and the force detection sensor. It provides mechanical coupling that translates plunger motion into measurable force, enabling precise force feedback detection without requiring direct contact between the sensor and moving plunger, thereby improving detection characteristics while keeping the mechanism simple
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 provides accurate detection of key presses in 0.1 mm increments, mitigates tremors, and extends the sensing range to a force region, improving user feedback and control accuracy.
Implementation Method 1
a sensing element including: a first sensing section configured to detect movement of the depressible plunger along the first range of motion
Implementation Method 2
a second sensing section configured to detect movement of the depressible plunger along the second range of motion
Implementation Method 3
the depressible element compresses as the depressible plunger moves farther along the second range of motion
Data Source
AI summary
In some embodiments, a key structure comprises a processor, a depressible plunger configured to travel along a range of motion including a first range of motion and a second range of motion, a dampening element that compresses as the depressible plunger moves farther along the second range of motion, and a sensing element including a first sensing section configured to detect movement of the depressible plunger along the first range of motion and generate corresponding first data and a second sensing section configured to detect movement of the depressible plunger along the second range of motion and generate corresponding second data. The processor is configured to determine a position of the plunger along the first range of motion based on the first data and determine the force produced by the plunger on the dampening element, while the plunger moves along the second range of motion, based on the second data.