Radio Wave Receiver Insulating Resin for Antenna Sensitivity

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Solution Overview

Problem

Radio-controlled timepieces with metallic case bodies and rear cases experience significant deterioration in antenna receiving sensitivity due to electrical connections through fixation screws, which can lead to conductive paths even with insulating coatings, causing electrical conduction between the case body and rear case.

Innovation Solution

A coupling resin member with nanometer-sized irregularities is used between the fixation screw and the through-hole in the rear case, providing electrical insulation and preventing conduction between the metallic device body and the closing member, enhancing antenna sensitivity by ensuring no direct contact between the case body and rear case.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a metallic fixation screw is used to fasten the device body and closing member, then the mechanical strength and fastening reliability are improved, but electrical conduction between the metallic components occurs, deteriorating antenna receiving sensitivity

Engineering Contradiction:

Improvefastening strengthVSAvoidelectrical conduction

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

An insulating member is introduced as an intermediary between the metallic fixation screw and the metallic closing member. This insulating member prevents electrical conduction while allowing the screw to maintain mechanical fastening strength. The insulating member is positioned to cover the contact surface between the screw and the closing member, effectively blocking the electrical path without compromising the structural integrity of the assembly.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If an insulating coat film is formed on the fixation screw, then electrical insulation is improved, but the insulating film is destroyed during fastening, causing electrical conduction

Engineering Contradiction:

Improveelectrical insulationVSAvoidinsulating film integrity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

Instead of relying on a pre-formed insulating coat film that may be destroyed during assembly, the insulating member is pre-installed on the fixation screw before fastening. This preliminary placement ensures that the insulating protection is already in position and will not be damaged during the fastening process, maintaining electrical insulation reliability throughout the product lifecycle.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The insulating member serves as a robust intermediary structure that replaces the fragile insulating coat film. While the coat film is thin and susceptible to mechanical damage, the insulating member provides substantial mechanical protection and electrical insulation simultaneously, ensuring the insulating function survives the fastening operation and subsequent product use.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If the case body and rear case are electrically connected, then the structural integrity and assembly simplicity are improved, but the antenna receiving sensitivity deteriorates significantly

Engineering Contradiction:

Improvestructural integrityVSAvoidreceiving sensitivity

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The electrical connection path is segmented by introducing the insulating member at the fixation screw interface. This segmentation divides the continuous metallic structure into electrically isolated sections, allowing the case body and rear case to remain mechanically connected while breaking the electrical conduction path. The segmentation maintains structural integrity through the mechanical fastening while preventing harmful electrical effects on the antenna.

Inventive Principle:

Principle #1Segmentation

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 maintains electrical insulation between the metallic components, improving antenna sensitivity and preventing electrical connections, thus maintaining the radio wave receiver's performance and appearance.

Implementation Method 1

A coupling resin member having electrically insulating property is disposed between the fixation screw and the through-hole

Methodology Applied

Scientific EffectElectrical insulation: Electrical Resistance

Implementation Method 2

the coupling resin member being coupled to the first closing member through a great number of irregularities of a nanometer size formed on a wall surface of the through-hole

Methodology Applied

Scientific EffectMechanical interlocking: Mechanical Fastener

Data Source

PatentUS8599076B2Radio wave receiver and method for producing radio wave receiver

Publication Date: 2013.12.03 CASIO COMPUTER CO LTD

AI summary

The radio wave receiver includes the antenna. The device body and the closing member are coupled to each other by making the screw portion of the fixation screw being inserted through the through-hole of the metallic closing member engage with the screw portion of the device body. The coupling resin member having electrically insulating property is coupled to the irregularities of a nanometer size formed on a metal surface of the closing member, a through-hole is formed in the coupling resin member, and thereby electrical insulation between the metallic device body and the metallic closing member which are screwed together with the fixation screw is ensured so as to improve receiving sensitivity of the antenna.