Electronic Pen Core Structure for Inductance Stability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing electronic devices with stylus pens lack an efficient core structure that effectively interacts with the device's magnetic field, leading to reduced inductance and impaired performance.

Innovation Solution

An electronic pen with a core structure comprising a first portion with a high magnetic flux density material and a second portion with a lower magnetic flux density material, along with a conductive coil surrounding the second portion, to enhance inductance and interaction with the electronic device's magnetic field.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a core structure with high magnetic flux density material is used to enhance electromagnetic interaction, then inductance is improved, but magnetic saturation occurs causing inductance decrease

Engineering Contradiction:

Improveelectromagnetic interaction effectivenessVSAvoidinductance decrease due to magnetic saturation

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The core structure is divided into two portions with different magnetic flux density characteristics: a first portion with high magnetic flux density material for strong electromagnetic interaction, and a second portion with lower magnetic flux density material to prevent magnetic saturation. This local differentiation allows the core to simultaneously achieve high inductance and maintain stability under magnetic field conditions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The core structure combines two different magnetic materials with distinct flux density properties into a single composite core. The first material provides high magnetic permeability for enhanced interaction, while the second material acts as a buffer against magnetic saturation, creating a composite structure that balances performance and stability.

Inventive Principle:

Principle #40Composite materials

2Power

If magnetic flux density is increased to improve electromagnetic interaction, then interaction strength is improved, but magnetic saturation reduces inductance

Engineering Contradiction:

Improveelectromagnetic interaction strengthVSAvoidinductance stability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

Different regions of the core are assigned different magnetic properties: the first portion uses high magnetic flux density material to concentrate and enhance the magnetic field for strong interaction, while the second portion uses lower magnetic flux density material to distribute and limit magnetic flux, preventing saturation and maintaining inductance stability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The magnetic flux density parameter is varied across different portions of the core structure. By changing the magnetic material properties (a key parameter) from high flux density in the first portion to lower flux density in the second portion, the system optimizes both interaction strength and saturation resistance.

Inventive Principle:

Principle #35Parameter changes

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

The proposed solution reduces the decrease in inductance due to magnetic saturation, thereby improving the electronic pen's performance and user experience by maintaining effective electromagnetic interaction with the electronic device.

Implementation Method 1

a magnetic flux density of the first material is greater than a magnetic flux density of the second material

Methodology Applied

Scientific EffectMagnetic flux density: Magnetic Field

Implementation Method 2

conductive coil surrounding at least a portion of the second portion

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS20250181178A1Electronic pen including core structure, and electronic device including same

Publication Date: 2025.06.05 SAMSUNG ELECTRONICS CO LTD

AI summary

An electronic device is provided. The electronic device includes a housing and an electronic pen detachable from the housing, wherein the electronic pen includes a case, a pen tip disposed at one end of the case and protruded from the one end to an outside of the case, a rod extending from the pen tip into an inside of the case, a core including a first portion facing the one end of the case and including a first material, a second portion contacting the first portion and including a second material, and a through-hole penetrating the first and second portions and accommodating at least a portion of the rod, and a conductive coil surrounding at least a portion of the second portion, wherein a magnetic flux density of the first material is greater than a magnetic flux density of the second material.