Middle Frame Isolation Structure Against Galvanic Corrosion

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Solution Overview

Problem

Galvanic corrosion occurs at the interface between metal middle frames and metal functional components in electronic devices when exposed to humid environments, leading to functional failures and weight reduction challenges.

Innovation Solution

A middle frame design incorporating a blocking member made of a non-conductive material, such as plastic, is integrated into the metal frame to isolate it from metal functional components, preventing direct contact and reducing the risk of galvanic corrosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Weight of moving object

If a metal middle frame is used to reduce weight, then the weight of the electronic device is reduced, but galvanic corrosion occurs at the interface with metal functional components in humid environments

Engineering Contradiction:

Improveweight of electronic deviceVSAvoidresistance to galvanic corrosion

Core Design Contradiction:

Weight of moving objectVSReliability

Solution Approach 1:

The patent introduces a non-conductive blocking member as an intermediary substance between the metal middle frame and metal functional components. This blocking member prevents direct contact between the two metal parts, thereby eliminating the galvanic corrosion pathway while allowing the metal middle frame to be used for weight reduction

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite structure by combining the metal middle frame with a non-conductive blocking member. This composite design allows the metal frame to provide structural support and weight reduction while the non-conductive material provides corrosion protection at the interface

Inventive Principle:

Principle #40Composite materials

2Reliability

If a blocking member is added to prevent galvanic corrosion, then resistance to galvanic corrosion is improved, but the structural complexity of the middle frame increases

Engineering Contradiction:

Improveresistance to galvanic corrosionVSAvoidstructural complexity of middle frame

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the blocking member with the middle frame structure, making them an integrated component rather than separate parts. This reduces assembly steps and simplifies the overall structure while maintaining the galvanic corrosion protection function

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

The solution effectively minimizes galvanic corrosion, ensuring normal operation of metal keys and display screens in humid conditions while maintaining a lightweight frame structure.

Implementation Method 1

galvanic corrosion is prone to occur at a position at which the middle frame fits with the key

Methodology Applied

Scientific EffectGalvanic corrosion:

Data Source

PatentUS20260101453A1Middle frame and electronic device

Publication Date: 2026.04.09 HONOR DEVICE CO LTD

AI summary

Embodiments of this application provide a middle frame and an electronic device. The middle frame includes a middle frame body and a blocking member, the middle frame body is made of a metal material, and the middle frame body has a mounting opening in communication with an outside. The mounting opening is configured to mount a metal functional member of the electronic device, and an inner wall of the mounting opening faces the metal functional member. The blocking member is disposed on at least a portion of the inner wall of the mounting opening, and is configured to isolate the middle frame body from the metal functional member.