Electrostatic Latent Image Boundary Exposure Control
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Solution Overview
Problem
In electrophotography, achieving high image quality and controlling micro-sized electrostatic latent images without reducing beam size is challenging, leading to high costs and image fidelity issues due to differences in toner adhesion and sensitivity between line and solid images, especially at high dot densities.
Innovation Solution
An image forming method that exposes a surface with a light pattern including image and non-image portions, where pixels at the boundary between the two are set as high power exposure pixels with increased light power, allowing for precise control of electrostatic latent image formation without altering the beam size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the beam size for exposure is reduced to increase resolution, then image quality is improved, but controlling image height becomes difficult and cost increases
Solution Approach 1:
The patent applies local quality by differentiating exposure conditions based on pixel type. Boundary pixels receive higher light power than regular pixels, creating localized variations in exposure energy. This allows micro-sized electrostatic latent images to be formed with controlled image height without reducing beam size, thereby maintaining resolution while avoiding the cost increases associated with beam size reduction and complex image height control mechanisms.
2Manufacturing precision
If different sensitivity is set for line image and solid image latent images to control pile height, then pile height is controlled, but fidelity of the latent image is lost
Solution Approach 1:
The patent applies local quality by differentiating exposure conditions based on pixel type. Boundary pixels receive higher light power than regular pixels, creating localized variations in exposure energy. This allows micro-sized electrostatic latent images to be formed with controlled image height without reducing beam size, thereby maintaining resolution while avoiding the cost increases associated with beam size reduction and complex image height control mechanisms.
3Manufacturing precision
If high dot density is achieved through improved developing, transfer, and fixing processes, then image quality is improved, but micro-sized characters with recognized detail remain difficult to output
Solution Approach 1:
The patent applies preliminary action by performing exposure with higher light power at the boundary between image and non-image portions before the developing process. This preliminary exposure adjustment creates a steeper charge density gradient at boundaries, which is then preserved through subsequent developing, transfer, and fixing processes. As a result, micro-sized characters with sharp boundaries and recognized detail can be successfully output at high dot densities.
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 method enables the formation of high-quality images with improved resolution and fidelity, particularly for micro-sized images, by concentrating exposure energy, thus reducing costs and maintaining image density without the need for complex processes.
Implementation Method 1
an electrostatic latent image is formed on a surface of a photoconductor by exposing the surface with light in accordance with an image pattern
Data Source
AI summary
An image forming method forms an electrostatic latent image corresponding to an image pattern including an image portion and a non-image portion by exposing a surface of an image bearer with light according to the image pattern. The image portion includes a plurality of pixels. Among the pixels constituting the image portion, at least a group of pixels existing at a boundary with respect to the non-image portion is set as a non-exposure pixel group. Among the pixels constituting the image portion, at least a group of pixels existing at a boundary with respect to the non-exposure pixel group is set as a high power exposure pixel group where exposure is performed with light of a higher light power value than a predetermined light power value required for exposing the image portion.