IC Card Reader Positioning for Transparent Card Detection

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Solution Overview

Problem

Existing card readers struggle to accurately position IC cards with transparent or light-transmitting areas due to the interference of optical sensors, leading to failed electrical connections and increased costs from additional sensor requirements.

Innovation Solution

A card positioning method using a combination of optical sensors along the conveyance path, including a first sensor positioned to detect the rear end of the IC card and a second sensor to verify the communication position, allowing for a reverse conveyance step to accurately position the IC card at the IC contact block, even with transparent areas.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If an optical sensor is used to detect the IC card position, then the detection speed and non-contact measurement are improved, but the detection accuracy deteriorates when the IC card has transparent or light-transmitting portions

Engineering Contradiction:

Improvedetection speedVSAvoidposition detection accuracy

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

A light blocking plate is introduced as an intermediary element between the optical sensor and the IC card. The light blocking plate is attached to a card sensing member that contacts the IC card, and it blocks the light path to the optical sensor when the IC card is present, enabling reliable detection regardless of the IC card's transparency

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct optical detection of the IC card with a mechanical contact system. A card sensing member with a light blocking plate mechanically contacts the IC card and translates its presence into an optical signal by blocking the light path, converting an optical detection problem into a mechanical contact problem

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If a contact-type card detection sensor is provided to detect transparent cards, then the detection accuracy is improved, but the device complexity and manufacturing cost increase

Engineering Contradiction:

Improvedetection accuracyVSAvoidsensor system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges the card detection function with the existing optical sensor system by adding a light blocking plate to a card sensing member. This integration allows the same optical sensor infrastructure to detect both transparent and non-transparent cards, avoiding the need for completely separate detection systems

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The modified optical sensor system with the light blocking plate achieves universal detection capability for both transparent and non-transparent IC cards, allowing a single sensor system to handle multiple card types without requiring separate specialized sensors

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If the IC card is conveyed by motor drive, then the conveyance speed and automation are improved, but the positioning precision deteriorates when the card needs to stop at an exact position

Engineering Contradiction:

Improveconveyance speedVSAvoidpositioning precision

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent uses optical sensors positioned along the conveyance path to detect the IC card's position and provides feedback to the motor control system. This feedback mechanism allows the motor to accurately position and stop the IC card at the correct location despite high conveyance speeds

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary detection of the IC card's presence and position using optical sensors before the card reaches the contact point. This preliminary action allows the motor to adjust its speed and positioning in advance to ensure accurate stopping at the required position

Inventive Principle:

Principle #10Preliminary action

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

Enables accurate positioning of IC cards with transparent areas, reducing sensor costs and maintaining effective data communication without additional optical sensors, thus optimizing the card reader's functionality.

Implementation Method 1

each of the plurality of sensors is an optical sensor that detects that an optical path is blocked by the IC card being conveyed

Methodology Applied

Scientific EffectOptical path blocking detection: Absorption (EM radiation)

Data Source

PatentUS20260093936A1Card positioning method and card reader

Publication Date: 2026.04.02 NIDEC INSTR CORP

AI summary

A card reader includes an IC contact block in electrical contact with a communication terminal of an IC card, and a plurality of sensors which are optical sensors provided in a conveyance path. When the IC card is positioned relative to the IC contact block, the card reader executes a first conveyance step for conveying the IC card inserted into an insertion opening to a farthest side of the conveyance path and a second conveyance step for reversing a conveyance direction after the first conveyance step, then further conveying the IC card by a predetermined distance when the first sensor detects an end portion of the IC card on an insertion opening side, and stopping conveying the IC card.