Image Forming Apparatus with Toner Correction for Transfer Pressure Changes
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Solution Overview
Problem
The relationship between the detection results of the toner adhesion amount detection unit and the image density is collapsed, leading to deviations in the output image density from the target density when the transfer pressure setting is changed.
Innovation Solution
An image forming apparatus with a toner adhesion amount detection unit, an image formation condition adjustment unit, a transfer pressure setting change unit, and a correction unit that uses correction values to adjust and correct the image formation conditions based on changed transfer pressure settings, ensuring the image density remains at the target value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transfer pressure setting is changed, then the transfer characteristics are improved, but the relationship between toner adhesion detection results and image density is collapsed
Solution Approach 1:
The patent introduces a correction value that changes based on the transfer pressure setting. When the transfer pressure setting changes, the correction value is updated to compensate for the effect on toner adhesion detection. This allows the system to maintain accurate image density control across different transfer pressure settings by dynamically adjusting the correction parameter.
Solution Approach 2:
The patent establishes a feedback mechanism where the toner adhesion detection unit continuously monitors toner adhesion, and the correction unit uses the detection results along with the correction value (which depends on transfer pressure setting) to adjust image formation conditions. This closed-loop feedback ensures that even when transfer pressure changes, the system can maintain accurate image density through continuous correction based on actual detection results.
2Productivity
If the transfer pressure setting is changed, then the transfer efficiency is improved, but the image density control is worsened
Solution Approach 1:
The patent introduces a correction value that changes based on the transfer pressure setting. When the transfer pressure setting changes, the correction value is updated to compensate for the effect on toner adhesion detection. This allows the system to maintain accurate image density control across different transfer pressure settings by dynamically adjusting the correction parameter.
Solution Approach 2:
The patent establishes a feedback mechanism where the toner adhesion detection unit continuously monitors toner adhesion, and the correction unit uses the detection results along with the correction value (which depends on transfer pressure setting) to adjust image formation conditions. This closed-loop feedback ensures that even when transfer pressure changes, the system can maintain accurate image density through continuous correction based on actual detection results.
Data Source
AI summary
An image forming apparatus including: an image bearer; an image formation unit forming toner image on the image bearer according to image formation conditions; a transfer unit including a transfer member, transferring the toner image on the image bearer to recording medium at a transfer nip between the image bearer and the transfer member; a toner adhesion amount detection unit detecting a toner adhesion amount of a toner pattern transferred from the image bearer to the transfer member; an image formation condition adjustment unit adjusting the image formation condition, based on a detection result of the toner adhesion amount detection unit; a transfer pressure setting change unit changing a transfer pressure setting of the transfer nip; and a correction unit correcting an adjustment value of the image formation condition adjustment unit, based on a correction value corresponding to a changed transfer pressure setting by the transfer pressure setting change unit.