Mouse Image Sensor Clock Tuning for Wireless Charging Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless peripheral devices, such as computer mice, face issues with battery life due to interference from electromagnetic (EM) charging fields, which cause erroneous movement detection and power consumption, especially when the on-chip clock frequency drifts with temperature changes.
Innovation Solution
Implementing a clock tuning system that adjusts the operating frequency of the image sensor circuit in a computer mouse to avoid noise-inducing frequency bands caused by EM charging, maintaining optimal performance and power management by setting the frequency to a target value, such as 66.9 MHz, to minimize interference and ensure accurate movement detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless charging is implemented to eliminate charging cables, then portability and convenience are improved, but electromagnetic interference causes erroneous movement detection and reduces reliability
Solution Approach 1:
The patent implements dynamic frequency tuning of the image sensor circuit to adapt to temperature changes and avoid electromagnetic interference bands. The system continuously monitors and adjusts the operating frequency to maintain optimal performance during wireless charging, transforming a static frequency system into a dynamic one that responds to environmental conditions.
Solution Approach 2:
The patent changes the operating parameter (frequency) of the image sensor circuit to avoid noise-inducing frequency bands caused by electromagnetic charging fields. By tuning the frequency away from interference bands and adjusting for temperature drift, the system maintains reliable movement detection while enabling wireless charging.
2Device complexity
If the image sensor circuit operates at a fixed frequency to simplify design, then device complexity is reduced, but temperature-induced frequency drift causes erroneous movement detection
Solution Approach 1:
The patent transforms the static frequency system into a dynamic one by implementing temperature compensation and frequency tuning mechanisms. The system actively adjusts the operating frequency based on temperature conditions to maintain accuracy, accepting the additional complexity as necessary for reliable operation during wireless charging.
Solution Approach 2:
The patent implements feedback mechanisms that monitor temperature and frequency drift, then adjust the operating frequency accordingly. This closed-loop control system detects frequency deviations caused by temperature changes and applies corrective tuning to maintain optimal operation.
3Measurement precision
If the operating frequency is tuned to avoid noise bands, then movement detection accuracy is improved, but additional frequency tuning mechanisms increase device complexity
Solution Approach 1:
The patent implements dynamic frequency tuning capabilities that allow the image sensor circuit to adapt its operating frequency in real-time. This dynamic adjustment mechanism enables the system to avoid electromagnetic interference bands while maintaining measurement precision, with the complexity justified by the significant improvement in detection accuracy during wireless charging.
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 clock tuning system significantly reduces erroneous movement detection and maintains performance specifications, ensuring battery life and tracking accuracy by stabilizing the image sensor circuit's frequency, even with temperature-induced shifts, thus enhancing the overall usability of wireless charging systems.
Implementation Method 1
The image sensor circuit is configured to image a surface to detect movement of the computer mouse with respect to the surface
Implementation Method 2
a wireless charging device that is electromagnetically coupled to the computer mouse to provide the computer mouse with electrical power
Implementation Method 3
the EM frequency generates noise on the image sensor circuit to cause erroneous movement detection of the input device in response to the operating frequency of the image sensor circuit being within one or more bands of noise frequencies
Data Source
AI summary
A method of operating a computer mouse includes receiving electromagnetic (EM) radiation emitted from a source external to the computer mouse, the received EM radiation induces noise within one or more bands of noise frequencies and an image sensor circuit of the computer mouse generates erroneous movement detection signals in response to an operating frequency of the image sensor circuit being within the one or more bands of noise frequencies. The method further includes determining the operating frequency of the image sensor circuit, comparing the operating frequency to a target frequency, wherein the target frequency is outside of the one or more bands of noise frequencies, and tuning the operating frequency of the image sensor circuit towards the target frequency.