Optical Analog Push Buttons for Precise Pressure Input
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Solution Overview
Problem
Conventional input devices, such as gaming controllers and keyboards, rely on digital switches that output binary signals, limiting the granularity of user input and preventing precise control of character movements and actions.
Innovation Solution
Analog input devices with pressure-sensitive buttons that use optical sensing to measure pressure variations, coupled with a multiplexer, analog-to-digital converter, and processor to generate analog signals, allowing for more nuanced input processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital switches are used in conventional input devices, then the device structure is simple, but the input precision and control granularity are limited to binary signals
Solution Approach 1:
The patent replaces digital mechanical switches with an optical sensing system. A light source emits light through a membrane to a photodetector, and pressure on the membrane modulates the light transmission, generating analog signals that preserve continuous pressure information, thereby achieving high input precision without binary quantization
Solution Approach 2:
The patent introduces a membrane as an intermediary element between the user's finger and the optical sensing components. The membrane transmits both mechanical pressure and optical signals, enabling the conversion of pressure into optical modulation that can be detected by the photodetector while maintaining structural simplicity
2Adaptability or versatility
If binary signals are used for input, then the device complexity is low, but the control granularity for character movements and actions is insufficient
Solution Approach 1:
The patent implements dynamic pressure sensing where the membrane can deflect continuously in response to varying finger pressure, and the optical system dynamically converts these continuous displacements into analog electrical signals, enabling fine-grained control of character movements and actions beyond binary on/off states
Solution Approach 2:
The patent changes the output parameter from discrete binary values to continuous analog signals. The photodetector output current varies continuously with the amount of light blocked by the membrane, providing a range of pressure levels that map to different control granularities for game character movements and actions
3Measurement precision
If analog pressure sensors are implemented, then input precision is enhanced, but the device complexity increases due to additional components
Solution Approach 1:
The patent merges multiple functions into the membrane component: it serves as the pressure-sensitive element, the optical modulator, and the structural support. This integration reduces the need for separate mechanical linkages and transducers, thereby limiting the increase in device complexity despite implementing analog pressure sensing
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 input precision by providing continuous variable or discrete actions based on pressure, enabling more granular control and reducing latency through software processing.
Implementation Method 1
an optical sensing sub-arrangement configured to measure an amount of light varied according to a pressure sensed at the pressure reception arrangement
Data Source
AI summary
An analog input device including at least one mounting panel and a matrix of analog push button assemblies mounted thereon. Each analog push button assembly including an analog pressure sensor including a pressure reception arrangement having an optical sensing sub-arrangement configured to measure an amount of light varied according to a pressure sensed at the pressure reception arrangement and an output terminal for outputting an analog signal corresponding to the amount of light measured, and a plunger element configured to exert the pressure on the pressure reception arrangement. The analog input device may include a multiplexer including an input side coupled to the push button assemblies and an output side; an analog-to-digital converter coupled to the output side of the multiplexer; a processor coupled to the analog-to-digital converter and configured to output a data packet; and a communication interface configured to transmit the data packet to a host computing device.