Cartridge Shielding Member for Electromagnetic Interference Protection

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Solution Overview

Problem

Conventional cartridges for image forming apparatuses fail to effectively shield electronic elements from electromagnetic waves generated between the charge roller and photosensitive drum, leading to data damage due to reflection, scattering, and diffraction, despite existing shielding approaches that only consider rectilinearity.

Innovation Solution

A cartridge design with a metal shielding member positioned between the contact line and electronic element, where the electronic element is placed within a shielding area formed by the shielding member, and the casing is inclined to minimize the projection area, with additional shielding reinforcement to cover the circumference, ensuring comprehensive protection from electromagnetic waves.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the electronic element is positioned in a predetermined place of the cartridge, then the electromagnetic waves from contact lines can be shielded, but the data stored in the electronic element is still damaged due to reflection, scattering and diffraction of electromagnetic waves

Engineering Contradiction:

Improvedata integrityVSAvoidelectromagnetic wave interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A shielding member made of conductive material is introduced as an intermediary between the charge roller contact line and the electronic element. This shielding member intercepts electromagnetic waves and directs them away from the electronic element, preventing reflection, scattering and diffraction that would otherwise damage the stored data.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The shielding member extends in a specific spatial dimension (lengthwise along the photosensitive drum) to create a three-dimensional shielding zone. By positioning the electronic element within this extended shielding structure, protection is provided against electromagnetic waves approaching from multiple angles, not just direct line-of-sight paths.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the electronic element is positioned away from the contact line, then some electromagnetic interference is reduced, but reflection, scattering and diffraction of electromagnetic waves still damage the data

Engineering Contradiction:

Improvedata storage accuracyVSAvoidshielding structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The shielding member is integrated with existing cartridge components (such as the casing or support structures) rather than being a completely separate addition. This merging approach provides comprehensive electromagnetic shielding while minimizing the number of discrete parts and simplifying the overall device structure.

Inventive Principle:

Principle #5Merging (Combining)

3Object-affected harmful factors

If conventional shielding approaches are used considering only rectilinearity, then direct electromagnetic waves are blocked, but reflected, scattered and diffracted waves still affect the electronic element

Engineering Contradiction:

Improvedirect electromagnetic wave exposureVSAvoiddata protection

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 efficiently shields electronic elements from electromagnetic waves, preventing data damage and ensuring accurate data storage and communication by minimizing the influence of reflection, scattering, and diffraction effects.

Implementation Method 1

a shielding member made of a metal which is interposed between the contact line and the electronic element to form a shielding area for shielding electromagnetic waves generated from the contact line

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Data Source

PatentUS7395007B2Cartridge for use in an image forming apparatus having an electronic element

Publication Date: 2008.07.01 HEWLETT PACKARD DEVELOPMENT COMPANY LP

AI summary

A cartridge for use in an image forming apparatus comprises a charge roller to which a predetermined voltage is applied; a photosensitive drum charged by the charge roller by rotating in contact with the charge roller; an electronic element for wireless communication which is positioned at a predetermined distance from a contact line between the charge roller and the photosensitive drum; and a shielding member made of a metal which is interposed between the contact line and the electronic element to form a shielding area for shielding electromagnetic waves generated from the contact line, the electronic element being positioned within the shielding area except for boundary portions of the shielding area. As a result, the cartridge is able to efficiently shield an electronic element from electromagnetic waves generated between a photosensitive drum and a charge roller.