Optical Mouse Surface Charge Dust Repulsion
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Solution Overview
Problem
Dust contamination on optical surfaces of optical mice creates a fixed pattern in sensed images, distorting algorithms and reducing the effectiveness of motion sensing, particularly in interference imaging systems.
Innovation Solution
Embedding positive charges in optical components using alpha particle irradiation or ion implantation techniques to reduce dust attraction, with alpha particles inducing a surface charge that repels dust, and using coatings like silicon nitride or silicon dioxide to trap the charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical elements are used in interference imaging systems, then motion sensing precision is improved, but dust contamination creates fixed patterns that distort correlation algorithms and reduce measurement accuracy
Solution Approach 1:
The patent applies ion implantation to embed positive charges in the optical element, creating an electrostatic field that actively repels dust particles. This converts the harmful effect of dust attraction into a beneficial repulsive force, preventing dust contamination while maintaining the optical element's functionality in interference imaging systems
Solution Approach 2:
The patent changes the electrostatic parameter of the optical element by embedding positive charges through ion implantation. This modifies the surface charge density and electrostatic potential, creating a repulsive electrostatic field that prevents dust adhesion. The charged optical element maintains its optical properties while gaining dust-repelling capabilities
2Object-affected harmful factors
If conventional imaging mice are used, then dust contamination is less problematic since dust is out of focal plane, but interference imaging systems require dust-free optical surfaces to maintain correlation accuracy
Solution Approach 1:
The patent applies ion implantation during manufacturing to preemptively embed positive charges in the optical element before the mouse is put into service. This preliminary charging creates a persistent electrostatic repulsive field that continuously prevents dust contamination throughout the product's lifecycle, eliminating the need for ongoing dust management
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 surface charge effectively reduces dust contamination on optical surfaces, enhancing the accuracy of motion sensing by minimizing the distortion caused by dust patterns in the correlation function.
Implementation Method 1
Exposure to an alpha source or ion implantation techniques may be used to create the surface charge
Implementation Method 2
Exposure to an alpha source or ion implantation techniques may be used to create the surface charge
Implementation Method 3
Trapping charged particles in the optical element induces a surface charge, reducing attraction of dust to the optical surfaces
Data Source
AI summary
Reduction of dust contamination in optical mice. Trapped charged particles within an optical element result in a surface charge on the optical element, the surface charge reducing the attraction of dust to the optical surface. Charged particles may be trapped in the optical element, or in a coating on the element. Irradiation from an alpha source or ion implantation techniques may be used.