Detachable Pen Tip Assembly for High-Sensitivity Stylus Tilt Detection

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Solution Overview

Problem

Existing styluses have poor tilt sensitivity, requiring large angle tilts to detect, which affects writing smoothness and efficiency.

Innovation Solution

A pen tip assembly with a first assembly including two electrodes and a second assembly with connectors to transmit electrical signals, allowing for improved tilt detection and reduced abnormal writing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If two sets of electrical signals are used to detect tilt angle, then tilt function is supported, but tilt sensitivity is poor requiring large angle tilts

Engineering Contradiction:

Improvetilt sensitivityVSAvoidwriting smoothness

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The pen tip assembly is divided into a first assembly containing electrodes and a second assembly containing connectors, with the first assembly being detachably connected and positioned closer to the writing surface. This segmentation allows the electrodes to be optimally positioned for high tilt sensitivity while keeping the connector assembly separate, resolving the contradiction between measurement precision and ease of operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a spatial dimension by positioning the first assembly (electrodes) closer to the writing surface than the second assembly (connectors). This dimensional arrangement optimizes the detection capability for tilt angles while maintaining operational smoothness, effectively resolving the sensitivity-operability contradiction.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If pen tip assembly is designed with detachable connection between first and second assemblies, then tilt sensitivity is improved, but device complexity increases

Engineering Contradiction:

Improvetilt sensitivityVSAvoidassembly structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The pen tip assembly is segmented into a first assembly with electrodes and a second assembly with connectors, connected through detachable threading. This segmentation improves tilt sensitivity by optimizing electrode positioning while managing complexity through modular design that allows independent optimization of each assembly.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second assembly serves multiple functions: it provides structural support, houses the electrical connectors for signal transmission, and enables detachable connection to the first assembly. This multi-functionality reduces the need for additional components, managing device complexity while achieving improved tilt sensitivity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12333091B2Pen tip assembly, stylus, and method of preparing pen tip assembly

Publication Date: 2025.06.17 LENOVO (BEIJING) LTD

AI summary

A pen tip assembly includes a first assembly and a second assembly. The first assembly includes a first electrode and a second electrode. The second assembly includes a first connector configured to transmit a first electrical signal to the first electrode and a second connector configured to transmit a second electrical signal to the second electrode. The first assembly is detachably connected to the second assembly. The first assembly is closer to a writing surface of a user than the second assembly.