Image Forming Apparatus Exposure Control for High-Resolution Thinning
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Solution Overview
Problem
Image forming apparatuses using electrophotographic processes face challenges in maintaining high-resolution character reproducibility without increasing the number of line memories, as higher resolutions lead to increased image formation time and line width due to slower image carrying member speeds, and existing methods for thinning processing are limited in versatility, accuracy, and cost-effectiveness.
Innovation Solution
The apparatus includes a control portion that adjusts the exposure amount and development bias voltage to perform thinning processing, allowing for high-resolution image formation without additional line memories, by storing adjustment exposure amounts and using test patterns to optimize image quality, with the option to adjust both exposure and development settings based on environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the speed of the image carrying member is lowered to achieve high resolution, then the image quality is improved, but the image formation time is increased
Solution Approach 1:
The patent changes the speed parameter of the image carrying member to achieve different resolutions. By lowering the speed, higher resolution is achieved, though this increases image formation time. The system accepts this trade-off as necessary for quality output.
2Manufacturing precision
If the speed of the image carrying member is lowered to achieve high resolution, then the image quality is improved, but the line width is increased
Solution Approach 1:
The patent addresses line width increase by adjusting development conditions (bias voltage, development time) as compensating parameters when operating at lower image carrying member speeds. This allows maintaining acceptable line width characteristics while achieving high resolution.
3Manufacturing precision
If the development time is increased to achieve high resolution, then the image density is improved, but the line width is increased
Solution Approach 1:
The patent uses multiple parameter adjustments including bias voltage and development time to control the electrophotographic process. By optimizing these parameters together, the system achieves high resolution while minimizing line width increase through controlled toner transfer.
4Manufacturing precision
If additional line memories are added to improve high-resolution character reproducibility, then the image quality is improved, but the device complexity and cost are increased
Solution Approach 1:
The patent achieves high-resolution character reproducibility by changing operational parameters (exposure amount, development bias voltage) rather than adding hardware components. This parameter-based approach maintains character quality without increasing device complexity or requiring additional line memories.
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 approach enables high-resolution character reproducibility equivalent to low-resolution standards, reducing line width and image formation time, while maintaining cost-effectiveness and improving image quality through controlled exposure and development processes.
Implementation Method 1
a charging device that uniformly charges a surface of the image carrying member
Implementation Method 2
an exposure device that applies light to the charged image carrying member to form an electrostatic latent image
Implementation Method 3
a development device that applies a development bias voltage to a developer carrying member which carries a developer including at least a toner and that moves the toner from the developer carrying member to the electrostatic latent image
Data Source
AI summary
An image forming apparatus includes an image carrying member, a charging device that uniformly charges the image carrying member, an exposure device that forms an electrostatic latent image on the image carrying member, a development device that applies a development bias voltage to form a visible image in which toner is adhered to the electrostatic latent image, a control portion that controls an exposure amount in the exposure device and the development bias voltage and a storage portion that stores an exposure condition and a development condition. The resolution of image data can be switched to at least two types, a standard resolution and a high resolution higher than the standard resolution, and when the resolution of the image data is set at the high resolution, the control portion controls the exposure amount in the exposure device to perform thinning processing on the image.