Light-Emitting Device Head Zigzag Switching for Image Quality
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Solution Overview
Problem
Manufacturing a light-emitting-device head with light emitting devices arranged in a single scanning direction on a single substrate is challenging, often requiring multiple substrates arranged in a staggered manner, which can result in black lines or white lines on the recording medium at switching positions.
Innovation Solution
A light-emitting-device head with a first and second light-emitting-device arrangement, where the second arrangement overlaps the first in a second scanning direction, and a switching unit defines a zigzag switching position that connects overlapping dots with a line segment at a predetermined screen angle, preventing black or white lines by varying the switching position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple substrates are arranged in a staggered manner to manufacture the light-emitting-device head, then the device complexity is reduced and ease of manufacture is improved, but black lines or white lines appear on the recording medium at switching positions
Solution Approach 1:
The patent applies local quality by making the switching position vary locally according to the dot position in the image. Instead of using a fixed switching position throughout, the switching position is adjusted locally to coincide with dot positions, ensuring that transitions between substrate regions occur at locations that do not create visible lines. This local adaptation resolves the contradiction by maintaining manufacturing simplicity while improving image quality at critical locations.
Solution Approach 2:
The patent implements dynamics by making the switching position variable rather than fixed. The switching position changes dynamically based on the dot position in the image, allowing the system to adapt to different image content. This dynamic adjustment ensures that switching occurs at optimal locations that prevent visible lines while maintaining the staggered substrate arrangement for ease of manufacture.
2Ease of operation
If the switching position is fixed, then the device operation is simplified, but black lines or white lines appear on the recording medium at switching positions
Solution Approach 1:
The patent transforms the static switching position into a dynamic one that varies with dot position. This allows the system to maintain operational simplicity while adapting the switching location to prevent visible lines. The dynamic nature of the switching position enables it to coincide with dots in the image, eliminating the harmful visual artifacts that would appear with a fixed switching position.
Solution Approach 2:
The patent changes the parameter of switching position from a constant value to a variable value that depends on dot position. By making the switching position a variable parameter rather than a fixed parameter, the system can optimize image quality at each location while maintaining relatively simple operation. The parameter change allows the switching position to adapt to different image content and prevent visible lines.
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 configuration minimizes the occurrence of black or white lines on the recording medium at switching positions, ensuring a more uniform image formation by adjusting the switching position to align with the screen angle, thus maintaining image quality.
Implementation Method 1
an optical device that forms an electrostatic latent image by focusing light emitted from the light emitting devices on a photoconductor and exposing the photoconductor to the light
Implementation Method 2
a first light-emitting-device arrangement including light emitting devices arranged in lines extending in a first scanning direction
Data Source
AI summary
A light-emitting-device head includes a first light-emitting-device arrangement including light emitting devices arranged in lines extending in a first scanning direction; a second light-emitting-device arrangement including light emitting devices arranged in lines extending in a first scanning direction, the second light-emitting-device arrangement overlapping the first light-emitting-device arrangement in a second scanning direction at least in part; an optical device that forms an electrostatic latent image by focusing light emitted from the light emitting devices on a photoconductor and exposing the photoconductor to the light; and a switching unit that switches the light-emitting-device arrangement to be lit up between the first light-emitting-device arrangement and the second light-emitting-device arrangement at a switching position defined at any position in an overlapping portion where the first light-emitting-device arrangement and the second light-emitting-device arrangement overlap each other. The electrostatic latent image is composed of dots formed by a screening process performed with a screen having a predetermined screen angle. The switching unit defines the switching position such that when points in the electrostatic latent image that coincide with the switching position are connected to one another by a line, the line forms a zigzag shape while overlapping some of the dots, the zigzag shape including a line segment extending at the screen angle.