Antenna-Embedded Mobile Terminal Case via Two-Injection Molding

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Solution Overview

Problem

Conventional mobile communications terminals with protruding antennas are prone to damage, compromising portability and requiring techniques to reduce terminal volume while maintaining antenna functionality.

Innovation Solution

An antenna-embedded case is manufactured using a two-injection molding process, where a first injection-molded member covers one surface of the antenna pattern, and a second injection-molded member covers the other surface, embedding the antenna between them, allowing for a three-dimensional shape and enhanced radiation area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If rod antennas or helical antennas protrude outside terminals, then omnidirectional radiation is achieved, but the antennas are susceptible to damage when dropped

Engineering Contradiction:

Improveantenna durabilityVSAvoidportability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent merges the antenna with the terminal case by embedding the antenna pattern within the case structure through two-injection molding. The antenna pattern is integrated between the first and second injection-molded members, creating a unified structure where the antenna and case become a single component, eliminating the vulnerability of protruding antennas while maintaining portability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The antenna pattern is nested within the case structure, specifically embedded between the first injection-molded member (which may provide shielding) and the second injection-molded member. This nesting approach protects the antenna while keeping it functional within the terminal body.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Volume of moving object

If antenna functions are retained in smaller terminals, then terminal volume is reduced, but antenna performance may be compromised

Engineering Contradiction:

Improveterminal volumeVSAvoidantenna performance

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent applies local quality by using different materials for the first and second injection-molded members. The first injection-molded member may use shielding material to block interference, while the second member provides structural support and radiation characteristics. This localized material optimization maintains antenna performance within the reduced terminal volume.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs composite materials by combining different materials in the two-injection molding process. The first injection-molded member and second injection-molded member are made of different materials with complementary properties, creating a composite structure that optimizes both antenna performance and terminal miniaturization.

Inventive Principle:

Principle #40Composite materials

3Manufacturing precision

If a two-injection molding process is used to embed the antenna, then manufacturing precision is improved, but device complexity increases

Engineering Contradiction:

Improveantenna embedding precisionVSAvoidmanufacturing process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent combines two injection molding processes into a single integrated manufacturing operation. The first and second injection-molded members are formed in sequence within the same molding system, allowing precise positioning of the antenna pattern between them while maintaining efficient production. This merging approach achieves high manufacturing precision without proportionally increasing overall process complexity.

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 provides a durable and compact mobile communications terminal with improved antenna performance and reduced risk of damage, while maintaining omnidirectional radiation characteristics.

Implementation Method 1

forming a first injection-molded member covering one surface of the antenna pattern; and disposing the first injection-molded member, provided with the antenna pattern on one surface thereof, in a second mold with the antenna pattern disposed in a space inside the second mold, and injection-molding a second injection-molded member covering the other surface of the antenna pattern

Methodology Applied

Scientific EffectInjection molding:

Data Source

PatentUS8289216B2Antenna-embedded case for mobile communications terminal, method of manufacturing the same, and mobile communications terminal

Publication Date: 2012.10.16 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

A method of manufacturing an antenna-embedded case for a mobile communications terminal includes providing an antenna pattern, forming a first injection-molded member covering one surface of the antenna pattern, and disposing the first injection-molded member, provided with the antenna pattern on one surface thereof, in a second mold with the antenna pattern disposed in a space inside the second mold, and injection-molding a second injection-molded member covering the other surface of the antenna pattern to embed the antenna pattern between the first injection-molded member and the second injection-molded member.