Surface Plasmon Optical Mouse Detection System
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Solution Overview
Problem
Current pointing devices, such as optical mice and touch pads, rely on mechanical or optical navigation techniques that may suffer from wear and tear or require complex image processing, limiting their accuracy and durability in human-device interaction.
Innovation Solution
A detection system utilizing a transparent substrate, an image sensor array, and a reflective layer that creates surface plasmons based on the dielectric properties of objects in contact, allowing for precise image capture and cursor control through finger motion without mechanical parts or complex image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical navigation techniques are used to replace mechanical mice, then mechanical wear is eliminated, but complex image processing is required which limits accuracy and durability
Solution Approach 1:
The patent replaces mechanical navigation systems with an optical field-based detection system. Instead of using mechanical rollers or balls that physically contact the surface, the invention uses surface plasmons generated by incident light interacting with a reflective layer to detect finger motion. This substitution eliminates mechanical wear while simplifying the detection mechanism away from complex image processing algorithms.
Solution Approach 2:
The patent changes the detection parameter from spatial image coordinates to optical field properties. By detecting changes in the surface plasmon resonance conditions (which depend on the refractive index and angle of incidence), the system translates physical finger motion into optical parameter changes. This parameter transformation simplifies the detection process compared to traditional optical navigation that requires complex image correlation calculations.
2Ease of operation
If conventional optical mice are used, then no mechanical parts are present, but mechanical wear still occurs in touch interfaces
Solution Approach 1:
The patent replaces mechanical touch detection with optical field interaction. Instead of mechanical contact between a ball and surface, the system uses incident light to generate surface plasmons that interact with the finger. This substitution maintains ease of touch operation while completely eliminating mechanical wear by replacing physical contact with optical field interaction.
3Reliability
If surface plasmon detection is used, then mechanical wear is eliminated, but the system requires precise control of light wavelength and angle
Solution Approach 1:
The patent changes the detection approach from tracking spatial image patterns to measuring optical resonance conditions. By monitoring changes in surface plasmon resonance (which occur at specific wavelengths and angles), the system translates complex spatial motion detection into simpler optical parameter measurement. This approach maintains wear resistance while managing optical parameter control through resonance conditions rather than requiring complex real-time adjustment.
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 accurate and durable cursor control by capturing surface plasmon patterns, reducing mechanical wear and enhancing user interaction with devices like cell phones and computers, offering a reliable navigation scheme using finger motion.
Implementation Method 1
the reflective layer is configured such that the light creates surface plasmons whenever a first dielectric having a first refractive index is adjacent to the outer surface of the reflective layer
Data Source
AI summary
A detection system. The detection system includes a transparent substrate, an image sensor array, and a reflective layer. The substrate has first surface located opposite second surface and third surface located opposite fourth surface. The array is adjacent to the fourth surface. The reflective layer is adjacent to the third surface; the substrate is configured to receive light through the first surface; the second surface is configured to reflect the received light onto the third surface at a pre-selected angle of incidence; the reflective layer is configured such that the light creates surface plasmons whenever a first dielectric having a first refractive index is adjacent to the reflective layer; the reflective layer is configured to reflect the light onto the array whenever a second dielectric having a second refractive index is adjacent to the reflective layer; and the first refractive index differs from the second refractive index.