Condensation Member in Image Forming Airflow Path
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Solution Overview
Problem
Existing image forming apparatuses using electrophotographic systems face issues with condensation on optical components due to temperature and humidity changes, leading to deterioration of optical characteristics and increased manufacturing and energy costs in attempts to prevent condensation.
Innovation Solution
An image forming apparatus with a condensation member positioned in the airflow path from the fixing portion to the transparent member, which condenses and collects vapor, preventing condensation on the transparent member by maintaining a lower temperature and reducing humidity levels before they reach the optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heater unit is added to prevent condensation on optical components, then condensation prevention is improved, but manufacturing cost and energy consumption increase
Solution Approach 1:
The invention utilizes the cold airflow naturally generated by the fixing portion (which cools sheets after heat fixation) to prevent condensation on optical components. Instead of adding a heater, the system repurposes the existing cold airflow from the fixing portion to cool the optical components, converting a potentially harmful cold airflow into a beneficial condensation-prevention mechanism.
Solution Approach 2:
The airflow path from the fixing portion is given multiple functions: it continues to cool sheets after fixation and simultaneously prevents condensation on optical components by maintaining their temperature below dew point. This eliminates the need for separate heating systems while achieving dual objectives.
2Reliability
If the optical unit is sealed to prevent condensation, then internal condensation is prevented, but external surface condensation occurs and optical characteristics deteriorate
Solution Approach 1:
The invention extracts the optical unit from the sealed box structure, removing the transparent member (lens or mirror) from the enclosed optical unit and exposing it to the external environment. This allows the cold airflow to directly contact and cool the optical component surfaces, preventing condensation without trapping moisture inside a sealed unit.
Solution Approach 2:
The cold airflow acts as an intermediary between the fixing portion and the optical components, transferring cooling effect to the optical surfaces and preventing condensation formation without requiring direct thermal contact or sealed enclosures.
3Reliability
If the transparent member temperature is raised to prevent condensation, then condensation is prevented, but energy consumption increases
Solution Approach 1:
The invention converts the waste cold airflow from the fixing portion into a useful cooling resource for optical components. By directing this naturally occurring cold airflow over the optical members, the system prevents condensation without requiring additional energy input for heating or active cooling systems.
Solution Approach 2:
The fixing portion's cooling function serves dual purposes: cooling sheets after fixation and preventing condensation on optical components. The system uses its own operational byproducts (cold airflow) to solve the condensation problem, eliminating the need for separate energy-consuming prevention mechanisms.
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
Effectively prevents condensation on the transparent member, maintaining optimal optical characteristics and reducing energy consumption by utilizing a condensation member with higher thermal conductivity, positioned to collect vapor before it reaches the optical components, thus addressing the challenges of temperature and humidity-induced condensation.
Implementation Method 1
a condensation member provided in an airflow path from the fixing portion to the transparent member, and which condenses and collects vapor in the airflow
Data Source
AI summary
An image forming apparatus 100 includes a photosensitive drum 21 on which an electrostatic latent image is formed by being scanned with a light beam emitted from a light source 29 through a transparent member 26, a developing roller 23 that develops the electrostatic latent image formed on the photosensitive drum 21 to form an image on the photosensitive drum 21, a transfer roller 24 that transfers the image developed and formed by the developing roller 23 to a sheet S, a fixing portion 30 that heat-fixes the image transferred on the sheet S by the transfer roller 24 to the sheet S, and a condensation member 28 provided in an airflow path A from the fixing portion 30 to the transparent member 26, and condenses and collects vapor in the airflow.