Magnetic Image Sensor Noise Reduction via Adjustable Configuration Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic image sensors face challenges with stronger noise signals due to magnetic resistance deviations, leading to difficulties in accurately separating effective signals from noise, particularly in detecting finer characteristics of magnetic information on media like banknotes.
Innovation Solution
The magnetic image sensor incorporates a configuration resistance with an adjustable resistance value, manufactured using a thick film printing process, connected to the magnetic resistance in a one-to-one corresponding manner, along with a driving circuit and signal amplification circuit to control and amplify detected magnetic signals, reducing noise and improving signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If printing sintering process is used to manufacture magnetic sensing elements, then manufacturing precision is improved, but magnetic resistance deviation increases causing noise signals
Solution Approach 1:
A compensation circuit is introduced as an intermediary component between the magnetic sensing element and the output. This circuit measures the magnetic resistance deviation and generates a compensating signal that cancels out the noise, thereby maintaining signal accuracy despite manufacturing variations in the magnetic sensing elements.
Solution Approach 2:
The system implements a feedback mechanism where the magnetic resistance deviation is continuously monitored and fed back to the compensation circuit. The compensation circuit then adjusts its output to counteract the detected deviation, ensuring that the final output signal remains accurate despite variations in the magnetic sensing elements.
2Volume of moving object
If magneto-resistive elements are used with reduced gaps, then device size is reduced, but magnetic information resolution deteriorates
Solution Approach 1:
The compensation circuit acts as an intermediary that enhances the resolving power of the magneto-resistive elements. By compensating for the signal degradation caused by reduced element spacing, the system maintains high magnetic information resolution despite the compact device size enabled by closely spaced magneto-resistive elements.
3Manufacturing precision
If magnetic resistance deviation is reduced by changing resistance method, then magnetic resistance deviation decreases, but voltage deviation remains significant causing noise
Solution Approach 1:
The compensation circuit serves as an intermediary that specifically targets and corrects voltage deviation. It measures the voltage deviation caused by residual magnetic resistance variations and generates a compensating voltage signal, thereby eliminating the noise effect even when manufacturing precision is already improved.
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
This configuration effectively reduces noise signals and enhances the accuracy of magnetic image reading, enabling clearer distinction of magnetic information details, even in regions between magnetic heads, thus improving the overall resolution and reliability of magnetic image sensing.
Implementation Method 1
a magnetic resistance, arranged along a scanning direction, for detecting a changed magnetic signal in a range to be detected
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A magnetic image sensor is provided. The magnetic image sensor includes: a magnetic resistance (1), arranged along a scanning direction and configured to detect a changed magnetic signal in a range to be detected; a configuration resistance (2), connected with the magnetic resistance (1), wherein a resistance value of the configuration resistance (2) is adjustable; and a driving circuit (3), connected with the magnetic resistance (1) and configured to perform output control on the changed magnetic signal detected by the magnetic resistance (1) The problem of relatively stronger noise signal caused by a magnetic resistance deviation of a magnetic image sensor is solved.