Stylus Pen Resonance Circuit Eddy Current Blocking

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Solution Overview

Problem

Existing stylus pens face challenges in maintaining resonance frequency stability due to user grip and eddy current generation, which affects touch sensitivity and signal transmission.

Innovation Solution

The stylus pen incorporates a conductive blocking member with slits and connectors to prevent eddy current generation, surrounding the inductor and capacitor portions, and is connected to a ground portion to maintain constant inductance and capacitance values, thereby stabilizing the resonance frequency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conductive blocking member is added to prevent eddy currents, then resonance frequency stability is improved, but device complexity increases

Engineering Contradiction:

Improveresonance frequency stabilityVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The conductive blocking member is segmented into multiple blocking units spaced apart from each other, with connectors connecting these units. This segmentation prevents eddy current formation while maintaining structural integrity and ground connection, resolving the contradiction between improving reliability and reducing complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Connectors serve as intermediary elements that connect the spaced-apart blocking units to each other and to the ground portion. These intermediaries enable the blocking member to function effectively in preventing eddy currents while maintaining a manageable structural complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the blocking member surrounds the inductor portion, then eddy current generation is prevented, but manufacturing precision requirements increase

Engineering Contradiction:

Improveeddy current generationVSAvoidblocking member positioning

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The blocking member is divided into multiple discrete blocking units that can be positioned around the inductor portion. This segmentation reduces the precision required for the entire blocking member as a single component, while still effectively preventing eddy current generation through the distributed blocking units.

Inventive Principle:

Principle #1Segmentation

3Object-affected harmful factors

If multiple blocking units with connectors are used, then eddy current blocking effectiveness is improved, but device complexity increases

Engineering Contradiction:

Improveeddy current blockingVSAvoidblocking member structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The blocking member is segmented into multiple blocking units connected by connectors, creating a distributed blocking structure that effectively prevents eddy currents while maintaining manageable complexity through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The blocking units are arranged in a spatial distribution around the inductor portion rather than as a single continuous structure. This dimensional arrangement provides effective eddy current blocking through distributed coverage while reducing structural complexity compared to a solid enclosing block.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 design enhances the stylus pen's robustness against external factors, ensuring consistent resonance frequency and improved touch sensitivity by blocking eddy currents and maintaining constant inductance and capacitance values.

Implementation Method 1

a conductive blocking member configured to surround at least a portion of the resonance circuit portion... one slit that blocks generation of an eddy current

Methodology Applied

Scientific EffectEddy current: Eddy Currents

Implementation Method 2

a resonance circuit portion positioned in the body portion to be connected to the conductive tip to resonate an electrical signal transferred from the conductive tip

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 3

The resonance circuit portion may include an inductor portion connected between the conductive tip and the ground portion; and a capacitor portion connected between the conductive tip and the ground portion

Methodology Applied

Scientific EffectInductance: Inductor

Implementation Method 4

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS11481047B2Stylus pen resonating with a signal transferred from a touch sensor

Publication Date: 2022.10.25 HIDEEP INC

AI summary

An exemplary embodiment of the present invention provides a stylus pen including: a body portion; a conductive tip configured to be exposed from an inside of the body portion to an outside thereof; a resonance circuit portion positioned in the body portion to be connected to the conductive tip to resonate an electrical signal transferred from the conductive tip; and a conductive blocking member configured to surround at least a portion of the resonance circuit portion.