Magnetic Field Sensing for Waterproof Input Module Detection

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Solution Overview

Problem

Conventional portable terminals with detachable modules require physical switches that reduce internal space and can wear out due to frequent contact, compromising efficiency and waterproofing.

Innovation Solution

An electronic device design that uses a magnet and ferrite core to sense the insertion of an input module without a physical switch, allowing for efficient waterproofing and increased internal space by varying the magnetic field to detect module insertion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a physical switch is provided in the portable terminal to sense the input module, then the input module can be detected, but the internal space of the portable terminal is reduced

Engineering Contradiction:

Improvedetection of input moduleVSAvoidinternal space of portable terminal

Core Design Contradiction:

Measurement precisionVSVolume of stationary object

Solution Approach 1:

The patent replaces the mechanical switch system with a magnetic field-based sensing system. A magnet is embedded in the input module, and a magnetic sensor in the portable terminal detects the magnetic field to determine module insertion. This eliminates the need for physical contact switches, thereby preserving internal space while maintaining detection capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a magnetic field as an intermediary between the input module and the sensing system. Instead of direct mechanical contact between the switch and module, the magnetic field serves as the medium that transmits insertion information to the sensor, enabling non-contact detection.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If a physical switch and hole are provided for module insertion detection, then the module can be sensed, but the parts become worn or damaged due to frequent contact

Engineering Contradiction:

Improvedetection of module insertionVSAvoiddurability of contact parts

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent replaces the mechanical contact system with a magnetic field-based sensing system. The magnet embedded in the input module generates a magnetic field that is detected by the magnetic sensor in the portable terminal. This non-contact detection method eliminates wear and damage to contact parts while maintaining reliable insertion detection.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The input module itself generates the magnetic field through its embedded magnet, which automatically serves as the detection signal. The module's presence and insertion state are self-indicated through its magnetic field, eliminating the need for separate sensing mechanisms that would require physical contact.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If holes are formed in the input module and portable terminal for contact, then the switch can detect the module, but waterproofing efficiency is compromised

Engineering Contradiction:

Improvedetection of input moduleVSAvoidwaterproofing performance

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical switch system requiring physical holes with a magnetic field-based sensing system. The magnet in the input module and the magnetic sensor in the portable terminal enable detection without creating openings in the housing, thereby maintaining waterproofing integrity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The magnetic field serves as an intermediary that can penetrate the housing material without requiring physical holes. This allows the sensing system to detect module insertion through the intact housing structure, preserving waterproofing while enabling detection functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution effectively detects input module insertion while maintaining internal space and ensuring waterproofing, enhancing the device's functionality and durability.

Implementation Method 1

a magnet disposed inside the housing and adjacent to the at least one receiving hole

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

an input module configured to be insertable into the at least one receiving hole and including a ferrite core to block or redirect part of a magnetic field generated from the magnet

Methodology Applied

Scientific EffectFerromagnetism: Ferromagnetism

Data Source

PatentUS10401982B2Electronic device including input module

Publication Date: 2019.09.03 SAMSUNG ELECTRONICS CO LTD

AI summary

An electronic device is provided. The electronic device includes a housing including at least one receiving hole exposed to an outside, a magnet disposed inside the housing and adjacent to the at least one receiving hole, an input module configured to be insertable into the at least one receiving hole and including a ferrite core configured to block or redirect part of a magnetic field generated from the magnet, a sensor unit disposed inside the housing and configured to sense the magnetic field generated from the magnet, and a controller configured to sense whether the input module is inserted into the at least one receiving hole by a signal according to a strength of the magnetic field sensed by the sensor unit.