Photosensitive Member Packaging with Short, Centered Protective Sheet
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Solution Overview
Problem
Existing electrophotographic photosensitive members are susceptible to damage during storage and conveyance due to contact with protective sheet ends that can bend and press against the sensitive layer, leading to potential contamination and deterioration.
Innovation Solution
The protective sheet is designed with a length shorter than the electrophotographic photosensitive member, ensuring central alignment and using adhesive tape to secure it, along with support structures in the accommodation container to prevent bending and contact during conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective sheet length is equal to or larger than the photosensitive member length, then the photosensitive member is fully covered and protected, but the protective sheet ends can bend and press against the sensitive layer causing damage
Solution Approach 1:
The harmful ends of the protective sheet are extracted or removed by making the protective sheet length shorter than the photosensitive member length, eliminating the source of damage while maintaining protection of the sensitive layer through alternative means
Solution Approach 2:
The protective sheet is preliminarily positioned with its center aligned to the photosensitive member center, and adhesive tape is applied in advance to secure it, preventing the sheet from shifting and causing damage during storage and conveyance
2Stability of the object's composition
If the protective sheet is secured with adhesive tape, then the protective sheet remains stable during conveyance, but the adhesive tape may contact and contaminate the sensitive layer
Solution Approach 1:
The protective sheet has different functional zones: the central portion maintains close contact with the photosensitive member for protection, while the end portions are raised or separated to prevent contact with adhesive tape, creating local quality differences in the protective sheet's interaction with other components
Solution Approach 2:
The raised portions of the protective sheet act as intermediaries or barriers between the adhesive tape and the sensitive layer, preventing direct contact and potential contamination while maintaining the stabilizing effect of the adhesive tape
3Reliability
If the protective sheet fully covers the photosensitive member, then maximum protection is provided, but the protective sheet itself may be damaged during conveyance
Solution Approach 1:
The protective sheet is segmented into a central coverage portion and end portions, with the end portions made shorter to reduce exposure to damage during conveyance while the central portion maintains full coverage of the photosensitive member for protection
Solution Approach 2:
The protective sheet design inherently cushions the photosensitive member by maintaining coverage while reducing the vulnerable length of the protective sheet itself, providing prior protection against potential damage during storage and conveyance
Data Source
AI summary
A packaged object includes an electrophotographic photosensitive member and a protective sheet. The electrophotographic photosensitive member is formed in a cylindrical shape. The protective sheet covers at least a portion of an outer circumferential surface of the electrophotographic photosensitive member so that a center position in an axis line direction is aligned with a center position of the electrophotographic photosensitive member in the axis line direction. Provided that a length of the electrophotographic photosensitive member in the axis line direction is denoted by L1 (mm) and a length of the protective sheet in the axis line direction is denoted by L2 (mm), a relationship expressed by Expression (1) below is established:L2<L1.(1)