High-Voltage Output Apparatus Drum Potential Control
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Solution Overview
Problem
Existing image forming apparatuses, such as laser printers, face challenges in maintaining a constant potential on photosensitive drums due to variations in environmental conditions and drum layer thickness, leading to inconsistencies in image quality.
Innovation Solution
A high-voltage control apparatus that includes a voltage application part, a current detection part, and a control part to calculate and adjust DC voltages based on detected current values, ensuring a consistent discharge voltage for charging the image bearing member, thereby maintaining a constant drum potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed DC voltage is applied to the charge member, then the control system is simple, but the drum potential varies due to environmental conditions and drum layer thickness
Solution Approach 1:
The patent implements a feedback control system where the discharge voltage is detected and fed back to the control unit. The control unit adjusts the DC voltage applied to the charge member based on the detected discharge voltage to maintain a constant potential difference between the charge member and the photosensitive drum, thereby resolving the contradiction between simple control and consistent drum potential.
Solution Approach 2:
The patent dynamically changes the DC voltage parameter applied to the charge member based on detected discharge voltage characteristics. By adjusting the voltage parameter in response to environmental conditions and drum layer thickness variations, the system maintains consistent drum potential while adapting to changing conditions.
2Manufacturing precision
If the DC voltage to the charge member is adjusted to maintain constant drum potential, then image quality improves, but the control system becomes more complex
Solution Approach 1:
The control unit uses feedback from the discharge voltage detection to automatically adjust the DC voltage to the charge member. This feedback mechanism enables consistent image quality by maintaining constant drum potential while managing control complexity through automated adjustment based on detected parameters.
3Stability of the object's composition
If discharge voltage detection is implemented to calculate optimal charging voltage, then drum potential stability improves, but the detection and control system becomes more complex
Solution Approach 1:
The system detects discharge voltage and feeds this information back to the control unit, which calculates and applies the appropriate DC voltage to the charge member. This feedback loop stabilizes drum potential by continuously monitoring and adjusting based on actual discharge characteristics.
Solution Approach 2:
The detection system automatically measures discharge voltage characteristics and the control unit autonomously calculates and applies the optimal charging voltage without external intervention. The system serves itself by using its own detection capabilities to regulate its own operation, stabilizing drum potential through self-adjustment.
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
This solution ensures a constant drum potential irrespective of environmental conditions and drum layer thickness, resulting in high-quality image formation.
Implementation Method 1
a charge member that charges an image bearing member... a voltage application part that applies a DC voltage to the charge member
Implementation Method 2
a current detection part that detects a value of a current flowing in the image bearing member when the DC voltage is applied to the charge member
Implementation Method 3
a control part that calculates a first discharge voltage for the image bearing member based on a current value detected by the current detection part... and controls the DC voltage applied to the charge member, using the first discharge voltage and the second discharge voltage
Data Source
AI summary
The high-voltage output apparatus includes a voltage application part that applies a DC voltage to the charge member; a current detection part that detects a value of a current flowing in the image bearing member when the DC voltage is applied to the charge member; and a control part that calculates a plurality of discharge start voltages for the image bearing member, based on a plurality of current values detected by the current detection part as a result of the voltage application part applying a plurality of different DC voltages to the charge member, and controls the DC voltage applied to the charge member, using the plurality of calculated discharge start voltages. Consequently, a high-quality image can be formed by maintaining a potential on a photosensitive drum to be constant irrespective of the states of the circumstances and/or the drum layer thickness.