Magnetic PUF Disk as Positional Encoder
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Solution Overview
Problem
Conventional encoders, such as optical and magnetic encoders, are often required in printing devices to track motor movements and enable closed-loop control algorithms, but they can be costly and complex, and there is a need for a more precise and cost-effective solution for monitoring speed, position, and direction of motor movement.
Innovation Solution
A magnetic particle-based Physically Unclonable Function (PUF) disk is used as a positional encoder, which communicates unique data elements when read by magnetic sensors, allowing for precise tracking of motor movements and direction, eliminating the need for additional encoders by utilizing the unique magnetic field patterns and calibrating the sensor data to determine rotational speed and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical or magnetic encoders are used to track motor movements, then speed and position monitoring is achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines the encoder disk with an existing PUF (Physical Unclonable Function) disk used for authentication purposes. By merging the authentication disk with the encoder disk into a single component, the system eliminates the need for a separate encoder disk, thereby reducing device complexity while maintaining measurement precision for speed and position monitoring.
Solution Approach 2:
The PUF disk is designed to serve dual functions: authentication/identification and position encoding. The unique magnetic particle distribution provides both a cryptographic identifier for security purposes and a positional pattern for encoder functionality, allowing one component to perform multiple roles and reduce overall system complexity.
2Reliability
If conventional encoders are used for motor control, then closed-loop control is enabled, but cost and device complexity increase
Solution Approach 1:
The patent merges the encoder functionality with the existing PUF authentication system, allowing closed-loop control to be implemented using the same magnetic sensor infrastructure already present for authentication. This eliminates the need for additional encoder hardware and reduces control system complexity while maintaining reliability.
Solution Approach 2:
The magnetic sensor system performs dual duties: authenticating the PUF disk and simultaneously measuring position and speed for closed-loop control. By making the existing authentication infrastructure serve additional control functions, the system achieves reliable motor control without adding separate control components.
3Measurement precision
If additional encoders are added to monitor motor movements, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into a single encoder disk that integrates with the PUF authentication disk. This merged design provides comprehensive motor movement tracking (position, speed, direction) without requiring separate encoder components, thereby maintaining measurement precision while reducing the number of discrete parts.
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 PUF disk provides precise and reliable motor control by accurately monitoring speed and direction, reducing the need for additional encoders and enhancing the reliability of printing processes by preventing toner waste and maintaining print quality.
Implementation Method 1
A magnetic particle based 'PUF' (Physical Unclonable Function) disk, when read by magnetic sensor(s), as a positional encoder
Data Source
AI summary
The use of a magnetic particle based “PUF” (Physically Unclonable Function) disk, when read by magnetic sensor(s), as a positional encoder is described. It is often necessary to include a linear or rotary encoder within a device for tracking motor movements, or to enable a closed-loop control algorithm on the motor system. These randomly dispersed magnetic particle disks can be used as a positional encoder, where the speed of movement and the direction of movement may be monitored.