Cylindrical Base Body Radiused Transition for Photoreceptor Layer Adhesion

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Solution Overview

Problem

Existing electrophotographic photoreceptors face issues with printing quality stability due to differences in thermal expansion between the base body and the photoconductive layers, leading to peeling and wraparound, which deteriorate image formation.

Innovation Solution

A cylindrical base body with an outer peripheral surface and end surface configuration featuring inclined surfaces and a radiused connecting portion, reducing stress concentration and improving adhesion between layers, thereby stabilizing the connection and enhancing printing quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional cylindrical base body is used, then the structure is simple, but thermal expansion differences cause peeling and wraparound of layers

Engineering Contradiction:

Improvelayer adhesion stabilityVSAvoidbase body structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The base body incorporates curved transition surfaces instead of sharp edges at the connection between the cylindrical outer peripheral surface and the end surface. Specifically, the first inclined surface connects to the second inclined surface through a radiused transition portion, creating smooth curvature that distributes thermal expansion stresses and prevents layer peeling and wraparound.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The base body features asymmetric inclined surfaces at different locations: the first inclined surface is located at the outer peripheral surface while the second inclined surface is at the end surface. This asymmetric configuration allows differential accommodation of thermal expansion between layers, reducing stress concentration at the connection portions.

Inventive Principle:

Principle #4Asymmetry

2Reliability

If inclined surfaces are added to reduce stress concentration, then layer adhesion improves, but manufacturing complexity increases

Engineering Contradiction:

Improvelayer connection stabilityVSAvoidbase body fabrication

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The radiused transition portion provides a curved connection between inclined surfaces, which is more manufacturable than complex multi-faceted geometries. The curved surface can be achieved through standard machining operations such as turning or milling with rounded toolpaths, making the design practical for industrial production while maintaining stress distribution benefits.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 described configuration reduces peeling and wraparound of layers, ensuring consistent and stable printing quality by managing thermal expansion and improving layer adhesion, resulting in a more reliable image forming process.

Implementation Method 1

differences in thermal expansion between the base body and the photoconductive layers

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 2

reduces stress concentration and improving adhesion between layers

Methodology Applied

Scientific EffectStress distribution: Stress Relaxation

Implementation Method 3

improving adhesion between layers

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 4

improving adhesion between layers, thereby stabilizing the connection

Methodology Applied

Scientific EffectMechanical interlocking: Mechanical Force

Data Source

PatentUS10534306B2Base body, electrophotographic photoreceptor, and image forming apparatus

Publication Date: 2020.01.14 KYOCERA CORP

AI summary

A cylindrical base body of the disclosure includes an outer peripheral surface and an end surface which is connected to the outer peripheral surface. The outer peripheral surface includes a first inclined surface which is inclined inwardly toward the end surface, the end surface includes a second inclined surface which is inclined inwardly toward the outer peripheral surface and is connected to the first inclined surface, and a connecting portion of the first inclined surface and the second inclined surface has a radiused surface.