Multi-Photoreceptor Line Synchronization for Consistent Images
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Solution Overview
Problem
The fluctuation in the circumferential speed of a photoreceptor in an image forming apparatus leads to expansion or contraction of images transferred to a sheet, causing image quality issues.
Innovation Solution
The image forming apparatus employs a configuration with multiple photoreceptors and exposure heads, where a generation unit generates a line synchronization signal for each exposure head to control light emission timing, adjusting the cycle of the line synchronization signal to compensate for fluctuations in photoreceptor speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical suppression of photoreceptor speed fluctuation is used, then image quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces the mechanical suppression method (mentioned in Japanese Patent Laid-Open No. 5-341589) with an electronic control method. The generation unit electronically adjusts the line synchronization signal cycle to compensate for photoreceptor speed fluctuations, eliminating the need for high-precision mechanical machining and mounting while achieving the same image quality stabilization.
Solution Approach 2:
The patent changes the control parameter from mechanical speed stabilization to electronic signal cycle adjustment. By dynamically modifying the line synchronization signal cycle based on photoreceptor speed conditions, the system compensates for speed fluctuations without requiring mechanical precision, thus resolving the contradiction between image quality and ease of manufacture.
2Manufacturing precision
If line synchronization signal cycle is adjusted for each exposure head, then image quality consistency is improved, but device complexity increases
Solution Approach 1:
The patent divides the control system into separate generation units for each exposure head, with each unit independently adjusting its line synchronization signal cycle. This segmentation allows tailored compensation for each photoreceptor's specific speed characteristics while maintaining overall system manageability, achieving image quality consistency without excessive complexity.
Solution Approach 2:
The patent implements dynamic adjustment of the line synchronization signal cycle for each exposure head based on real-time or pre-characterized photoreceptor speed conditions. This dynamic approach enables the system to adapt to varying operating conditions and maintain image quality consistency without requiring complex static mechanical adjustments.
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 effectively suppresses fluctuations in the line interval due to variations in photoreceptor speed, thereby maintaining consistent image quality by preventing image expansion or contraction and reducing color shifts.
Implementation Method 1
An electrophotographic image forming apparatus forms an electrostatic latent image on a photoreceptor by exposing light on the rotationally driven photoreceptor
Data Source
AI summary
An image forming apparatus includes: a plurality of photoreceptors; a plurality of exposure heads provided so as to correspond to the plurality of photoreceptors, respectively, each of the plurality of exposure heads including a plurality of light emitting units configured to emit light for exposing the corresponding photoreceptor, the plurality of light emitting units being arranged along a rotation axis line of the corresponding photoreceptor; and a generation unit configured to generate a line synchronization signal for each of the plurality of exposure heads to control a light emission timing in a rotating direction of the corresponding photoreceptor, the generation unit being configured to adjust a cycle of the line synchronization signal in accordance with each of the plurality of exposure heads.