Memory Thyristor Array for LED Print Head Control
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Solution Overview
Problem
Conventional LED print heads in electrophotographic image forming apparatuses face challenges in efficiently controlling and coordinating the lighting of multiple light-emitting elements for precise image formation, leading to inefficiencies in image processing and potential variations in light emission intensity.
Innovation Solution
A light-emitting device comprising an array of light-emitting elements connected to a light-up signal line, memory elements to designate which elements to light up, and switch elements to sequentially shift the ON state across the array, allowing for parallel control and synchronized lighting of groups of light-emitting thyristors using transfer and memory signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional LED print heads control multiple light-emitting elements for precise image formation, then image formation precision is improved, but control complexity and coordination difficulty increase
Solution Approach 1:
The light-emitting element array is divided into multiple groups, with each group controlled by dedicated switch elements and memory elements. This segmentation allows independent control of each group while maintaining overall coordination, reducing the complexity of controlling all elements simultaneously.
Solution Approach 2:
Memory elements are used to pre-designate which light-emitting elements should be activated before the actual lighting occurs. This preliminary action separates the decision-making process from the execution process, allowing for more manageable control coordination.
2Productivity
If conventional LED print heads light up multiple light-emitting elements simultaneously, then image processing speed is improved, but variations in light emission intensity increase
Solution Approach 1:
Each light-emitting element group is equipped with its own switch elements and memory elements, allowing for localized control and optimization. This enables precise adjustment of each group's lighting characteristics, reducing variations in light emission intensity across different groups while maintaining high-speed operation.
3Device complexity
If conventional LED print heads use simple control circuits, then device complexity is reduced, but control efficiency and coordination capability deteriorate
Solution Approach 1:
The control architecture is extended into a new dimension by adding memory elements that store control signals before execution. This temporal dimension allows for more efficient control coordination without proportionally increasing circuit complexity, as the memory elements act as buffers that decouple signal generation from signal execution.
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 enables efficient and synchronized lighting of multiple light-emitting elements, improving image processing efficiency and reducing variations in light emission intensity, thereby enhancing the overall performance of the image forming apparatus.
Implementation Method 1
a light-emitting element array formed of plural light-emitting elements that are arrayed in line and that are connected to a light-up signal line to supply a current for lighting up
Implementation Method 2
a memory element array formed of plural memory elements that are provided so as to correspond to the respective light-emitting elements forming the light-emitting element array, that are connected through respective resistances to a memory signal line to supply a signal to designate a light-emitting element to be caused to light up, that each have an ON state and an OFF state, and that each memorize by changing into the ON state that a corresponding one of the light-emitting elements is to be caused to light up
Implementation Method 3
a switch element array formed of plural switch elements that are provided so as to correspond to the respective memory elements forming the memory element array, that are electrically connected to the respective memory elements, that each have an ON state and an OFF state, that are connected to a transfer signal line to supply signals to set so as to allow a sequential shift of the ON state from one end side to the other end side
Data Source
AI summary
A light-emitting device includes: an array of light-emitting elements connected to a light-up signal line to supply a current for lighting up; an array of memory elements provided so as to correspond to the respective light-emitting elements, connected through respective resistances to a memory signal line to supply a signal to designate a light-emitting element to be lighted up, and memorizing by getting turned on that a corresponding light-emitting element is to be lighted up; and an array of switch elements provided so as to correspond to the respective memory elements, electrically connected to the respective memory elements, connected to a transfer signal line to supply signals to set so as to allow a sequential shift of an ON state from one side end to the other end side, and causing the respective memory elements to be likely to be set in an ON state by getting turned on.