Non-contact Information Processing Device Antenna Circuit Layout
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Solution Overview
Problem
Existing non-contact information processing devices face challenges in reducing size while maintaining strong magnetic fields and minimizing the impact of shield members on antenna performance.
Innovation Solution
The device features a communication antenna and signal processing circuit mounted on a flat substrate with the signal processing circuit on the outer peripheral side and a connector member on the inner peripheral side, eliminating the need for a protruding connection piece and reducing the size, and incorporates a mesh-shaped shield pattern to minimize eddy current losses and noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the signal processing circuit part is mounted on the inner peripheral side relative to the antenna coil, then the size of the antenna module can be reduced, but the magnetic field strength is weakened due to eddy current loss in the shield member
Solution Approach 1:
The patent inverts the conventional mounting arrangement by placing the signal processing circuit part on the outer peripheral side of the antenna coil instead of the inner peripheral side. This inversion eliminates the need for a shield member between the coil and circuit, thereby preventing eddy current losses and maintaining magnetic field strength while still achieving compact size through alternative connector placement on the inner peripheral side.
2Reliability
If a shield member is attached to cover the signal processing circuit part, then erroneous operation is prevented, but the magnetic field generated by the antenna coil is weakened largely
Solution Approach 1:
The patent extracts and removes the shield member from the antenna module structure. By placing the signal processing circuit part on the outer peripheral side of the antenna coil, the circuit is naturally protected from direct exposure to the oscillating magnetic field, making the shield member unnecessary and eliminating the associated eddy current losses.
3Volume of moving object
If the connector member is mounted on the outer peripheral side of the antenna coil, then the device size can be reduced, but the wiring lines may interfere with the magnetic field
Solution Approach 1:
The patent applies local quality by differentiating the functional zones: the inner peripheral side of the antenna coil is designated for mounting the connector member and signal processing circuit part, while the outer peripheral side is reserved for the antenna coil's magnetic field generation. This spatial differentiation minimizes wiring interference with the magnetic field while maintaining compact device size.
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 allows for a smaller device size with reduced magnetic field strength loss and characteristic variation, minimizing the impact of wiring and shield patterns on the magnetic field, while preventing noise interference in signal data transmission.
Implementation Method 1
a communication antenna formed in a ring shape... configured to perform communication of information with a card-shaped medium in a non-contact manner
Implementation Method 2
a shield member for covering the signal processing circuit part is attached to the substrate. The shield member functions, for example, to reduce an effect of a magnetic field generated by the antenna coil on the signal processing circuit part
Implementation Method 3
a magnetic field generated by the antenna coil may be weakened largely by a loss due to an eddy current generated in the shield member when the antenna coil is excited
Data Source
AI summary
A non-contact type information processing device may include a flat plate-shaped substrate on which a communication antenna formed in a ring shape and a signal processing circuit part electrically connected with the communication antenna are mounted; and a connector member structured to electrically connect a host device on which the non-contact type information processing device is mounted with the non-contact type information processing device. The signal processing circuit part may be mounted on the substrate on an outer peripheral side relative to the communication antenna formed in the ring shape; and the connector member may be mounted on the substrate on an inner peripheral side relative to the communication antenna formed in the ring shape so that an inserting direction of a second connector member which is inserted and connected with the connector member is substantially parallel to a thickness direction of the substrate.