Matted Reflecting Face for Uniform Static Elimination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In electrographic image forming apparatuses, the static eliminating device often fails to sufficiently eliminate static charges from the photosensitive drum due to increased rotation speed, leading to defective images and uneven light exposure, which can result in transfer memory images and white voids.
Innovation Solution
A static eliminating device with a light emitting part and an optical path providing part, where the reflecting faces are matted to enhance reflectance and maintain consistent light exposure across the photosensitive drum, preventing toner adhesion and ensuring even light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the photosensitive drum rotation speed is increased to accelerate the image forming apparatus, then the productivity is improved, but the static elimination time is shortened resulting in insufficient carrier elimination and transfer memory images
Solution Approach 1:
The static eliminating device is positioned to perform static elimination before the cleaning device removes toner, ensuring that carrier elimination occurs during the available time window. This preliminary action allows the system to maintain high rotation speeds while still achieving sufficient static elimination by utilizing the time period before toner removal interferes with the process.
Solution Approach 2:
A partition member is introduced as an intermediary structure between the static eliminating device and the transferring device. This partition member creates a dedicated optical path for the static elimination light while preventing toner from reaching the light emitting part, thereby maintaining effective static elimination even at high rotation speeds where toner scattering is more pronounced.
2Duration of action of moving object
If the static eliminating device is arranged at the upstream side from the cleaning device to provide wide interval for carrier removal, then the static elimination time is sufficient, but toner adheres to the light emitting part reducing light amount
Solution Approach 1:
The partition member serves as a protective intermediary that blocks toner from reaching the light emitting part while allowing the static elimination light to pass through its optical path. This resolves the contradiction by maintaining both sufficient static elimination time and adequate light intensity for effective carrier removal.
Solution Approach 2:
The optical path is extracted and separated from the main toner flow path by positioning the static eliminating device and creating a dedicated light transmission channel. This separation allows the light emitting part to remain protected from toner adhesion while still providing sufficient illumination for static elimination over the required duration.
3Illumination intensity
If glossy reflecting faces are used in the optical path, then the reflectance is heightened increasing light amount, but toner adhesion increases causing uneven light distribution and white voids
Solution Approach 1:
The partition member is designed with a matte surface specifically at the reflecting face within the optical path, creating a localized non-glossy region. This local quality change prevents toner adhesion at the critical reflecting surface while maintaining the overall optical functionality, thereby ensuring uniform light distribution without white voids.
Solution Approach 2:
The surface property parameter of the partition member is changed from glossy to matte in the optical path region. This parameter change reduces toner adhesion tendency while maintaining sufficient light reflection for effective static elimination, resolving the contradiction between light amount and light distribution uniformity.
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 ensures consistent and sufficient static elimination, reducing the occurrence of defective images and maintaining even surface electrical potential across the photosensitive drum, thereby preventing transfer memory images and white voids.
Implementation Method 1
a light emitting part emitting a static eliminating light to a surface of a photosensitive drum
Implementation Method 2
A part of the static eliminating light is reflected by faces at the optical path side (called as reflecting faces) of the housing and partition member
Data Source
AI summary
A static eliminating device includes a light emitting part and an optical path providing part. The light emitting part emits a static eliminating light to a surface of an image carrier. The optical path providing part includes a reflecting face reflecting the static eliminating light and a radiation end from which the static eliminating light is radiated to the surface of the image carrier. The reflecting face is a matted face.