Fixing Device Film Blocks Heat Transfer to Sensor
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Solution Overview
Problem
In image forming apparatuses, the sensitivity of sensors is compromised due to heat from the fixing device, leading to suboptimal detection of test patterns and reduced image quality, especially when the fixing device is designed to be smaller and lighter, allowing heat to flow towards the sensor.
Innovation Solution
Incorporating a film between the sensor and the housing of the fixing device to block heat transfer, thereby preventing the sensor from being heated by the fixing device's heat, which improves image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the fixing device is designed to be smaller and lighter by exposing the pressing roller or forming holes in the housing, then the fixing device size and weight are reduced, but heat flows towards the sensor from passages or holes, deteriorating sensor sensitivity
Solution Approach 1:
A heat-resistant film is introduced as an intermediary substance between the heat source (fixing device) and the sensor. The film selectively blocks heat transfer to the sensor while allowing the fixing device to maintain its reduced size and weight design with holes and exposed pressing roller.
Solution Approach 2:
A thin heat-resistant film is applied to cover the sensor surface, providing thermal protection without adding significant weight or complexity. This flexible protective layer allows the fixing device housing to remain lightweight with necessary openings while protecting the sensor from heat damage.
2Device complexity
If the pressing roller is exposed from the housing or holes are formed in the housing to make the fixing device smaller, then the fixing device structure is simplified and weight is reduced, but heat transfer passages are created that flow heat towards the sensor
Solution Approach 1:
The heat-resistant film acts as a mediator that blocks the harmful heat transfer path created by the simplified housing structure with holes and exposed pressing roller, without requiring the housing to be more complex or heavier.
Solution Approach 2:
The heat-resistant film is applied locally only where needed - on the sensor surface or in specific areas where heat transfer is problematic - rather than requiring the entire housing structure to be redesigned for thermal protection.
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 film effectively suppresses heat transfer from the fixing device to the sensor, maintaining sensor sensitivity and enhancing image quality by preventing heat-induced deterioration.
Implementation Method 1
a film disposed between the sensor and the housing of the fuser
Data Source
AI summary
An image forming apparatus may includes: an apparatus body; a fixing device removably mounted to the apparatus body and including a first fixing member, a heat generation member which heats the first fixing member, a second fixing member forming a fixing nip between the first fixing member and the second fixing member, and a housing accommodating at least the heat generation member and the first fixing member and provided with a communication part communicating between inner and outer sides of the housing; a transfer member arranged upstream of the fixing device in a conveyance direction of a recording sheet, and to which developer is configured to be transferred; a sensor configured to detect the developer transferred to the transfer member; and a film arranged to cover the sensor between the communication part and the sensor.