Overmolding Decorative Features in Electronic Enclosures

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Solution Overview

Problem

Existing electronic device enclosures with decorative features require hard-coating for protection, which degrades their appearance over time due to wear and tear, and existing manufacturing methods do not effectively integrate decorative elements without this coating.

Innovation Solution

A method involving a two-layer overmolding process where a decorative feature is formed on an opaque plastic layer, which is then covered by a light transmissive layer, allowing the decorative feature to be visible and protected from damage, eliminating the need for a hard-coating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If decorative features are applied to the outer exterior surface of an enclosure, then the appearance of the enclosure is improved, but the decorative features become vulnerable to abrasive damage and require hard-coating protection

Engineering Contradiction:

ImproveappearanceVSAvoidabrasive damage

Core Design Contradiction:

ShapeVSObject-affected harmful factors

Solution Approach 1:

Instead of applying decorative features to the outer surface and then protecting them with hard-coating, the patent inverts the sequence by forming the decorative feature as an internal element within the molded structure. The decorative feature is created during the molding process itself, embedded within the enclosure material, eliminating the need for vulnerable surface coatings while maintaining aesthetic appearance.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The decorative feature is nested within the enclosure structure rather than being applied to the surface. The molding process creates an internal cavity or recess that contains the decorative element, which is then visible through the translucent or transparent outer layer of the enclosure, providing protection while displaying the decorative design.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If a hard-coating is formed over decorative features for protection, then the decorative features are protected from damage, but the appearance degrades over time due to wear and tear of the coating

Engineering Contradiction:

Improveprotection from damageVSAvoidappearance durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent extracts the decorative feature from the surface level and relocates it to an internal position within the enclosure structure. By removing the decorative element from the vulnerable outer surface and embedding it within the molded material, the need for protective hard-coating is eliminated, and the decorative feature becomes inherently protected while maintaining long-term appearance durability.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If traditional single injection molding is used to form enclosures, then manufacturing efficiency is maintained, but the enclosure appears outdated and lacks aesthetic appeal

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidaesthetic appeal

Core Design Contradiction:

ProductivityVSShape

Solution Approach 1:

The patent merges the decorative feature formation process with the injection molding process itself. The decorative element is integrated into the mold cavity or core, allowing it to be formed simultaneously with the enclosure structure in a single molding operation. This combination maintains manufacturing efficiency while producing enclosures with enhanced aesthetic appeal through built-in decorative features.

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

This approach enhances the aesthetic appeal of electronic device enclosures by integrating decorative features without the need for hard-coating, providing protection against scratches and wear while maintaining the appearance of the enclosure.

Implementation Method 1

a light transmissive layer, allowing the decorative feature to be visible

Methodology Applied

Scientific EffectLight transmission: Light

Data Source

PatentEP2509770B1System and method for overmolding of decorated plastic parts

Publication Date: 2023.06.07 FLEXTRONICS AP LLC

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AI summary

An electronic device enclosure includes a first structural layer having a first surface and a second surface. A decorative feature is formed on the first surface of the first structural layer. The enclosure further includes a second structural layer, which is formed directly on the first surface of the first structural layer. The second structural layer is formed over the decorative feature by an overmolding process.