Magnetic Sensor Device Sequential Output Circuit
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Solution Overview
Problem
Magnetic sensor devices face limitations in resolution in the width direction due to the pitch between magnetic detection elements, which hinders high-resolution magnetic pattern detection on media like paper bills, and require multiple analog circuits for processing, making it difficult to enhance reading speed and resolution simultaneously.
Innovation Solution
The magnetic sensor device simplifies the reading circuit by transferring outputs from multiple magnetic detection elements sequentially to a common output line, allowing for enhanced resolution and improved reading speed by using a common amplifier circuit and correction processes to adjust offset voltages and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple magnetic detection elements are arrayed along the reading line, then the reading resolution in the width direction is improved, but the device complexity and cost increase due to requiring multiple analog circuits
Solution Approach 1:
Multiple magnetic detection elements share a common amplifier circuit and common output line, merging previously separate signal processing paths into a unified structure that reduces component count while maintaining detection capability
Solution Approach 2:
The magnetic detection elements are activated sequentially in time-division manner rather than simultaneously, with each element taking turns to output signals through the shared amplifier circuit, enabling resource sharing while preserving measurement capability
2Measurement precision
If the pitch between adjacent magnetic detection elements is reduced to improve resolution, then the reading resolution is improved, but the reading speed decreases
Solution Approach 1:
Magnetic detection elements are activated in sequential time intervals rather than simultaneously, allowing each element to complete its measurement cycle before the next is activated, thereby maintaining high resolution while enabling faster overall reading throughput
Solution Approach 2:
The system dynamically switches between different magnetic detection elements based on temporal requirements, adapting the activation sequence to balance resolution needs with reading speed requirements
3Measurement precision
If multiple analog circuits are prepared to process outputs from multiple magnetic detection elements, then the reading resolution is improved, but the device complexity and cost increase
Solution Approach 1:
Multiple individual analog circuits are merged into a single shared amplifier circuit that processes signals from all magnetic detection elements sequentially, dramatically reducing the number of analog components required
Solution Approach 2:
The common amplifier circuit is designed to universally handle signals from any of the magnetic detection elements, making the circuit multi-functional and eliminating the need for dedicated circuits for each element
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 enables higher resolution magnetic pattern detection while maintaining fast reading speeds, facilitating the processing of two-dimensional magnetic patterns with reduced noise and improved accuracy.
Implementation Method 1
a plurality of magnetic detection elements 11 arrayed along a reading line D that intersects with a feeding direction of a medium S including magnetic patterns
Data Source
Figure 1
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Figure 5
AI summary
The reading circuit of output signals from a plurality of magnetic detection elements is simplified and the reading resolution of a magnetic pattern is improved. A magnetic sensor device includes a magnetic detection element (11), and a magnet (13) applying a bias magnetic field to the magnetic detection elements (11) with a line of magnetic force in the constant direction. The magnetic sensor device detects a magnetic field change when a medium with a magnetic pattern passes through the bias magnetic field as an electric signal through the magnetic detection elements and reads the magnetic pattern of the medium. A plurality of the magnetic detection elements (11) is arrayed along a line intersecting the relative movement direction of the medium. A plurality of reading switches (22) is connected to the respective magnetic detection elements (11) and an output line (28) common to the plurality of magnetic detection elements (11). The magnetic sensor device includes a shift register (23) closing the reading switches (22) sequentially one by one to transfer the outputs from the magnetic detection elements (11) sequentially one by one to the output line (28).