Polygonal Mirror Surface Identification Circuit Sharing
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Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately identifying and correcting for the varying reflective surfaces of rotating polygonal mirrors, leading to image distortion due to differences in surface lengths and inclinations, which requires multiple sensors and circuits, increasing circuit size and complexity.
Innovation Solution
An information processing apparatus that uses a shared identifying unit to determine the reflective surface of each rotating polygonal mirror based on detection signals from BD sensors, allowing for correction of image data and reducing circuit size by identifying surfaces sequentially and sharing identification circuits across multiple mirrors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If one BD sensor and one surface identifying circuit are provided for each polygon mirror, then reflective surface identification is achieved, but circuit size increases
Solution Approach 1:
A single surface identifying circuit is designed to handle multiple polygon mirrors by sequentially processing identification signals from each mirror. The circuit receives BD signals from different mirrors at different time points and performs identification operations for each, making the circuit multi-functional and eliminating the need for separate dedicated circuits for each mirror.
Solution Approach 2:
The identification process is implemented through periodic timing control where the single identifying circuit processes BD signals from multiple mirrors in a sequential, time-division manner. Each mirror's identification occurs at a specific time slot, allowing the circuit to cycle through multiple mirrors repeatedly without interference, achieving periodic multi-object identification.
2Reliability
If multiple surface identifying circuits are provided for multiple polygon mirrors, then each mirror can be identified independently, but the number of circuits increases
Solution Approach 1:
The single surface identifying circuit is designed with universal functionality to handle identification tasks for multiple different polygon mirrors. It can selectively process BD signals from any connected mirror by receiving timing control signals that indicate which mirror is currently being identified, making one circuit serve multiple purposes.
Solution Approach 2:
The circuit operates dynamically by switching its identification target based on timing control signals. The circuit's function changes over time - at different time points it identifies different mirrors - allowing adaptive multi-object identification without requiring static dedicated circuits for each object.
3Device complexity
If sequential identification is implemented using a single identifying unit, then circuit size is reduced, but identification time increases
Solution Approach 1:
The sequential identification process uses periodic timing control to cycle through multiple mirrors rapidly. By implementing regular identification cycles with optimized time slots for each mirror, the system achieves frequent refresh rates that minimize the time penalty of sequential processing while maintaining the benefits of a single circuit.
Solution Approach 2:
The system performs preliminary timing setup and signal synchronization before actual identification begins. BD signals are pre-synchronized with the identification cycle, and timing control signals are prepared in advance, allowing the sequential identification to proceed efficiently without unnecessary delays during the actual identification process.
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 precise identification and correction of reflective surfaces, reducing image distortion and circuit size by using a single identifying unit for multiple mirrors, thereby improving image quality and reducing hardware requirements.
Implementation Method 1
a first rotating polygonal mirror including a plurality of reflective surfaces and configured to scan the first photosensitive member by rotating to deflect the light output from the first light source by the plurality of reflective surfaces
Implementation Method 2
a first light receiving unit configured to receive the light deflected by the first rotating polygonal mirror. A first output unit is configured to output a first signal in response to reception of the light by the first light receiving unit
Data Source
AI summary
An apparatus identifies reflective surfaces used for scanning a first photosensitive member and a second photosensitive member. A first storage stores correction data corresponding to each of reflective surfaces of a first rotating polygonal mirror. A first correction unit corrects, on a basis of the correction data and information indicating the reflective surface, image data in association with the reflective surface. A second storage stores correction data corresponding to each of reflective surfaces of a second rotating polygonal mirror. A second correction unit corrects, on a basis of the correction data and information indicating the reflective surface, image data in association with the reflective surface.