Optical Writing Device Vibration Isolation Housing
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Solution Overview
Problem
Existing optical writing devices using deflection scanning systems suffer from image quality degradation due to vibration-induced pitch irregularities, as vibrations from the deflector are not effectively isolated, leading to displacement of the imaging position on the photoconductor, which existing solutions fail to adequately address.
Innovation Solution
Incorporating a vibration isolator and a rigidity enhancer in the housing unit of the optical writing device, specifically using notches to isolate vibrations from antinodes and a rib to increase rigidity, thereby reducing vibration transmission to the light source and optical element units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locally hollow wall is provided near the light source unit to increase rigidity, then vibration of the light source unit is reduced, but the housing structure becomes more complex
Solution Approach 1:
The housing bottom face is segmented into multiple regions by providing notches that divide the structure into isolated zones. These notches create separate vibration zones, preventing vibration transmission from high-vibration areas (near deflector) to low-vibration areas (optical element seat face), thereby reducing overall housing vibration without adding complex reinforcement structures.
Solution Approach 2:
The patent applies local quality by providing rigidity enhancers (ridges) specifically at the optical element seat face region where vibration must be minimized, while leaving other regions of the housing with standard thickness. This localized reinforcement approach reduces vibration at critical areas without unnecessarily increasing overall housing complexity.
2Reliability
If a partition wall is provided between mechanical deflector region and optical element region to increase rigidity, then housing vibration is reduced, but device complexity increases
Solution Approach 1:
The housing is segmented into distinct functional regions using notches that create vibration isolation zones. The first region contains the deflector with high vibration, while the second region contains optical elements requiring low vibration. The notches act as vibration barriers, segmenting the housing structure to prevent cross-contamination of vibrations between regions.
3Reliability
If multiple housings are fastened with vibration-proof members to isolate polygon mirror and optical element, then vibration transmission is reduced, but assembly complexity and cost increase
Solution Approach 1:
The patent merges the vibration isolation function into the housing structure itself by integrating notches and rigidity enhancers directly into the housing bottom face. This eliminates the need for separate vibration-proof members and multiple housings, as the single housing structure inherently provides vibration isolation through its designed geometry, thereby simplifying assembly and reducing part count.
4Temperature
If an arcuate C-shaped through-hole is provided around the optical element seat face, then heat from polygon motor is isolated, but vibration from vibration antinode is not effectively reduced
Solution Approach 1:
The housing is segmented into vibration isolation zones using notches that create distinct regions separated by vibration barriers. This segmentation approach effectively blocks vibration transmission paths from vibration antinodes to the optical element seat face, addressing the vibration reduction issue that the C-shaped through-hole failed to resolve.
Solution Approach 2:
The patent applies local quality by providing rigidity enhancers specifically at the optical element seat face region to increase local stiffness and reduce vibration amplitude at this critical location, while the notches provide vibration isolation from surrounding areas.
Data Source
AI summary
An optical writing device performs writing by scanning an image surface of a photoconductor with light, and includes a light source unit including a light source that emits light, a deflection unit that deflects and scans the light, an optical element unit for the light, and a housing unit that holds the light source unit, the deflection unit, and the optical element unit. The housing unit includes a vibration isolator that isolates vibration transmitted from a vibration antinode where distribution of vibration in a sub direction perpendicular to a scanning direction of the light on the image surface of the photoconductor is maximum to at least one of seat face parts for the light source unit and the optical element unit having optical sensitivity in the sub direction, in a bottom face part of the housing unit, and a rigidity enhancer that increases rigidity of the seat face part.