Modular Keyswitch Substrate With Embedded Sensing for Analog Key Travel
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Solution Overview
Problem
Contemporary input devices, such as keyboards, face challenges with analog keys that provide better resolution but come at increased production costs, system complexity, and keyswitch addressing delays, necessitating a more efficient and cost-effective solution.
Innovation Solution
Integration of embedded analog sensing elements within smart keyswitches that allow for modular placement on keyboards, enabling compatibility with various sensing technologies without requiring dedicated infrastructure on the main PCB, and facilitating hot swapping of keyswitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If analog sensing elements are integrated into keyswitches, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the sensing system into modular keyswitch units, each with its own integrated analog sensing elements. This segmentation allows each keyswitch to independently provide high-resolution detection while the overall system maintains simplicity through standardized modular architecture rather than complex centralized sensing infrastructure.
Solution Approach 2:
The patent implements universal keyswitch adaptors that can accommodate multiple sensing technologies (analog, galvanic, optical) through a standardized interface. This multi-functionality allows the same physical infrastructure to support different sensing types, reducing overall system complexity while maintaining high measurement precision through analog sensing capability.
2Measurement precision
If analog sensing elements are integrated into keyswitches, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the sensing functionality into individual keyswitch modules with integrated analog sensors, the patent enables independent manufacturing and testing of each module. This reduces production complexity and cost compared to implementing analog sensing across an entire keyboard matrix, while still achieving high measurement precision at each key position.
Solution Approach 2:
The patent employs cost-effective analog sensing elements within each keyswitch that can be manufactured independently and replaced individually if needed. This approach uses simpler, more economical sensing components compared to complex digital or optical systems, reducing per-unit manufacturing cost while maintaining adequate measurement precision for key press detection.
3Measurement precision
If dedicated infrastructure is added to main PCB for sensing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the sensing functionality from the main PCB infrastructure and relocates it into individual keyswitch units. This extraction eliminates the need for complex dedicated sensing infrastructure on the PCB, reducing device complexity while maintaining high measurement precision through the integrated analog sensing elements within each keyswitch.
Solution Approach 2:
Each keyswitch unit performs its own sensing function with integrated analog sensing elements, eliminating the need for external sensing infrastructure on the main PCB. This self-service approach reduces overall system complexity while achieving high measurement precision through distributed sensing architecture.
4Device complexity
If conventional galvanic keyswitches are used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent merges the advantages of simple galvanic keyswitch architecture with enhanced analog sensing capability by integrating analog sensing elements directly into the keyswitch unit. This combination maintains the simplicity of mechanical keyswitch operation while adding precision measurement capability, resolving the trade-off between device complexity and measurement precision.
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 cost-effective, modular, and sustainable keyboard designs with faster scanning rates, reducing material waste and allowing easy upgrades by replacing individual keyswitches rather than the entire keyboard.
Implementation Method 1
The sensor system can include an optical sensor configured to sense a position of the plunger
Implementation Method 2
The sensor system can include an inductive sensor configured to sense a position of the plunger
Implementation Method 3
The sensor system can include a magnetic sensor configured to sense a position of the plunger
Implementation Method 4
The sensor system can include a capacitive sensor configured to sense a position of the plunger
Data Source
AI summary
A key structure comprising a housing, a plunger extending from a top side of the housing and configured to be depressed and travel along a range of motion, and a horizontally-oriented substrate configured on the bottom of the housing. The substrate including a motion sensor system configured to detect movement of the plunger along the range of motion and generate corresponding travel data, the travel data enabling one or more processors to determine a position of the plunger along the range of motion.