Micro Touch Pen With Electromagnetic Core And Stop Portion

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Solution Overview

Problem

Capacitive touch control devices face challenges with low precision in position detection, which hinders smooth operation, especially in handheld devices, requiring more precise and efficient detection methods.

Innovation Solution

A micro touch pen structure incorporating a casing unit, circuit unit, first and second electromagnetic units, and an elastic unit, featuring a pen core with movable portions and a stopper to restrict the position of the second electromagnetic body, enhancing precision through electromagnetic interactions and elastic elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a conventional capacitive touch control device is used, then the device has simple construction and lower cost, but the position detection precision is low which hinders smooth operation

Engineering Contradiction:

Improveposition detection precisionVSAvoiddevice construction complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent implements a nested structure where the electromagnetic pen core is disposed inside the capacitive touch sensor assembly. The pen core unit with electromagnetic components is nested within the housing that also contains the touch sensor, creating a compact integrated device that enhances detection precision without proportionally increasing overall complexity

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent introduces an electromagnetic pen core as an intermediary tool between the user and the capacitive touch sensor. The pen core generates electromagnetic fields that interact with the touch sensor to enhance position detection precision, serving as a mediator that bridges the gap between simple capacitive sensing and precise position detection

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If a rigid pen tip is used to apply significant force on the resistive touch control device, then deformation of the resistive touch sensor can be accomplished, but the device structure becomes more complex and requires higher force application

Engineering Contradiction:

Improvetouch detection precisionVSAvoidforce required for operation

Core Design Contradiction:

Measurement precisionVSForce

Solution Approach 1:

The patent replaces the mechanical force-based resistive touch mechanism with an electromagnetic field-based detection system. Instead of requiring significant mechanical force to deform the touch sensor, the electromagnetic pen core generates electromagnetic fields that interact with the capacitive touch sensor, eliminating the need for high force application while maintaining detection precision

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 micro touch pen structure improves position detection precision by restricting the electromagnetic body's position, providing enhanced accuracy and usability in capacitive touch control devices.

Implementation Method 1

at least one electromagnetic coil wound around the first hollow electromagnetic body and electrically connected to the circuit unit

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

The elastic unit is disposed inside the pen-shaped casing structure and between the first movable portion and a fixed structure

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS10551943B2Micro touch pen structure including pen core with stop portion that moves together with magnetic unit when pressure is applied to movable portion of pen core

Publication Date: 2020.02.04 WACOM CO LTD

AI summary

A micro touch pen structure includes a casing unit, a circuit unit, a first electromagnetic unit, a pen core unit, a second electromagnetic unit and an elastic unit. The circuit unit is disposed inside the pen-shaped casing structure. The first electromagnetic unit includes a first hollow electromagnetic body inside the pen-shaped casing structure and an electromagnetic coil wound around the first hollow electromagnetic body and electrically connected to the circuit unit. The pen core unit includes a first movable portion passing through the first hollow electromagnetic body, a second movable portion partially exposed from the pen-shaped casing structure, and a stop portion connected between the first and the second movable portions. The second electromagnetic unit includes a second hollowing electromagnetic body fixed inside the pen-shaped casing structure and disposed around the first movable portion. The elastic unit is disposed between the first movable portion and a fixed structure.