Magnetoresistive Sensor and Optical Reader for Sheet Media
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Solution Overview
Problem
Existing image reading devices for sheet-like media, such as banknotes, fail to associate optical images and magnetic patterns with their positional relationships, leading to separate and unrelated information processing.
Innovation Solution
An image reading device is designed with a magnetic circuit and a magnetoresistive effect element that generates a magnetic field perpendicular to the conveyance plane, combined with an optical system to simultaneously read optical and magnetic information from the same area, allowing for the association of optical and magnetic patterns with their positional relationship.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image reading device and magnetic reading device are independently disposed, then each reading device can be optimized for its specific function, but the reading positions and reading ranges differ, causing acquired information to be processed as unrelated information
Solution Approach 1:
The patent combines the image reading device and magnetic reading device into a single integrated device with a common conveyance plane. The optical sensor and magnetic sensor are positioned to read from the same sheet area simultaneously, merging previously separate reading functions into one unified system that captures both optical and magnetic information with associated positional data.
Solution Approach 2:
The conveyance plane serves multiple functions: it is the reading area for both optical and magnetic sensors, the reference for positional relationships, and the surface along which the sheet is conveyed. This multi-functional design eliminates the need for separate reading platforms and enables correlated acquisition of different types of information.
2Ease of operation
If optical sensor and magnetic sensor read from different positions, then each sensor can operate independently, but the optical image and magnetic pattern cannot be joined as composite information
Solution Approach 1:
The patent merges the reading functions by positioning both the optical sensor and magnetic sensor to operate on the same conveyance plane and read from the same sheet area. This allows the system to simultaneously acquire optical image information and magnetic pattern information with their positional relationships preserved, enabling composite information creation.
Solution Approach 2:
The conveyance plane acts as an intermediary reference that provides positional information for both optical and magnetic readings. By using the conveyance plane's coordinate system as a common reference framework, the system can accurately associate and join optical and magnetic information despite the different sensing mechanisms.
3Device complexity
If reading devices are disposed separately, then device complexity is reduced with independent components, but information processing becomes fragmented and less accurate
Solution Approach 1:
The patent merges separate image reading and magnetic reading devices into one integrated device sharing a common conveyance plane and control system. This integration maintains the functional independence of different sensing mechanisms while achieving synchronized operation and unified data processing, thereby improving measurement precision without excessive complexity increase.
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 enhances the precision of identifying sheet-like media by enabling the simultaneous acquisition and association of optical and magnetic information, improving the accuracy of data processing.
Implementation Method 1
a magnetoresistive effect element configured to detect a strength change of a conveyance direction component of the magnetic field in the first magnetic reading area
Implementation Method 2
the magnetic circuit generates a magnetic field in a first magnetic reading area on the conveyance plane in a direction perpendicular to the conveyance plane
Data Source
AI summary
An image reading device including: a magnetic circuit comprising a magnet disposed on one side of a conveyance plane, the magnetic circuit generating a magnetic field in a direction perpendicular to the conveyance plane; a magnetoresistive effect element chip disposed between the magnetic circuit and the conveyance plane and detecting a strength change of a conveyance direction component of the magnetic field in the magnetic reading area when a medium to be read is conveyed on the conveyance plane; a light guide disposed on a side opposite to the magnetic circuit side with respect to the conveyance plane, and irradiating light onto the magnetic reading area on the conveyance plane; and an image forming optical system disposed on the side opposite to the magnetic circuit side with respect to the conveyance plane.