Light-absorbing overcoat layer for photoreceptor light shock resistance
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Solution Overview
Problem
Conventional photoreceptors experience intrinsic light shock due to interaction with blue light, particularly affecting organic overcoat layers, which is not adequately addressed by existing solutions that focus on the photogenerating layer.
Innovation Solution
Incorporating a light-absorbing material such as diphenoquinone into the overcoat layer to absorb light in the 400-575 nm range, preventing light interaction with the overcoat layer and reducing intrinsic light shock without compromising electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional organic overcoat layer is used, then the photoreceptor maintains good electrical properties, but the overcoat layer suffers from intrinsic light shock when exposed to blue light (400-575 nm wavelength)
Solution Approach 1:
A light-absorbing material is introduced as an intermediary substance within the overcoat layer to intercept blue light before it can interact with and damage the organic overcoat materials. This mediator absorbs the harmful 400-575 nm wavelength light, preventing light shock while allowing the overcoat to maintain its electrical functionality
Solution Approach 2:
The optical parameters of the overcoat layer are modified by incorporating light-absorbing materials that specifically target the 400-575 nm wavelength range. This changes the layer's light absorption characteristics without altering its electrical properties, creating a dual-function overcoat that resists light shock while maintaining charge transport capability
2Object-affected harmful factors
If existing light shock protection solutions are applied, then light shock is reduced, but the solution does not address intrinsic overcoat layer light shock and focuses only on the photogenerating layer
Solution Approach 1:
The overcoat layer is designed to perform multiple functions simultaneously: it maintains its traditional role in charge transport and surface conditioning while also providing light shock protection through incorporated light-absorbing materials. This multi-functional approach addresses both the electrical performance and light shock resistance requirements in a single integrated solution
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 significantly improves resistance to light shock, enhancing print quality while maintaining the photoreceptor's electrical performance, as demonstrated by reduced print halftone changes and stable electrical properties.
Implementation Method 1
the overcoat layer comprises a light-absorbing material that absorbs light having a wavelength of about equal to or less than 700 nanometers
Data Source
AI summary
Embodiments pertain to a novel imaging member, namely, an imaging member or photoreceptor comprising an overcoat layer which comprises light-absorbing material that improves print quality. The light-absorbing material reduces the intrinsic light shock suffered by conventional overcoat layers without negatively impacting electrical properties of the overcoat layer.