Accessory Attachment Position Detection Using a Shared Magnetometer

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Solution Overview

Problem

Existing attachment detection solutions for electronic devices have high consumable costs due to the use of multiple Hall devices and magnets.

Innovation Solution

A system that uses a magnetometer in the electronic device and existing attachment components in the accessory to detect proper positioning, reducing costs by eliminating the need for multiple Hall devices and magnets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple Hall devices and magnets are used for attachment detection, then detection reliability is improved, but device complexity and consumable costs increase

Engineering Contradiction:

Improveattachment detection reliabilityVSAvoiddetection system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the attachment detection function with the existing magnetometer used for other purposes (such as compass or gesture recognition). By merging the attachment detection capability into the existing magnetometer system, the patent eliminates the need for separate Hall devices and magnets, thereby reducing device complexity and consumable costs while maintaining detection reliability through software-based detection algorithms

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The existing magnetometer in the electronic device is made multi-functional by enabling it to perform both its original functions (such as compass navigation or gesture recognition) and the new attachment detection function. This universality allows a single component to serve multiple purposes, reducing the need for additional dedicated components for attachment detection

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If multiple Hall devices and magnets are used for attachment detection, then detection precision is improved, but consumable costs increase

Engineering Contradiction:

Improveattachment state detection precisionVSAvoidconsumable materials quantity

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The magnetometer uses its own inherent magnetic field sensing capability to detect attachment states, eliminating the need for external magnets and Hall devices. The system serves itself by leveraging the existing magnetometer's functionality rather than requiring additional consumable components to enable detection

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the mechanical/magnetic component-based detection system (Hall devices and magnets) with a software-based detection algorithm that processes magnetic field intensity information. This substitution eliminates the need for additional physical consumables while maintaining detection precision through computational methods

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Difficulty of detecting and measuring

If multiple Hall devices and magnets are used for attachment detection, then detection capability is improved, but internal layout space is consumed

Engineering Contradiction:

Improveattachment detection capabilityVSAvoidinternal layout space

Core Design Contradiction:

Difficulty of detecting and measuringVSArea of stationary object

Solution Approach 1:

The patent merges the attachment detection functionality into the existing magnetometer's operational space, eliminating the need for separate physical components. This merging approach allows detection capability to be achieved without consuming additional internal layout space, as the same sensor infrastructure is utilized for multiple purposes

Inventive Principle:

Principle #5Merging (Combining)

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

Accurately determines the attachment state of the accessory with reduced consumable costs and simplified internal layouts, while maintaining effective detection of both orientations.

Implementation Method 1

a magnetometer, configured to obtain and output magnetic field intensity information of a position of the magnetometer; and a to-be-attached accessory, including a second attachment component... The magnetometer is further configured to be triggered by a combined magnetic field of the first attachment component and the second attachment component

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentUS12298804B2System for detecting proper positioning of accessory

Publication Date: 2025.05.13 HONOR DEVICE CO LTD

AI summary

A system for detecting proper positioning of an accessory, including an electronic device and an accessory. The electronic device includes a first attachment component, a magnetometer, and a processor. The accessory includes a second attachment component. The second attachment component is configured to be attached to the first attachment component, so that the accessory is fixed through attachment to the electronic device in a first orientation or a second orientation. The magnetometer is further configured to be triggered by a combined magnetic field of the first attachment component and the second attachment component to output the magnetic field intensity information when the accessory is fixed through attachment to the electronic device in the first orientation or the second orientation. The processor indicates whether the accessory is fixed in position based on the magnetic field intensity information.