Optical Scanner Resin Casing Curved Reinforcement
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Solution Overview
Problem
In optical scanning devices used in electrophotographic printers, high-speed rotation of the polygon scanner can cause resonance, leading to a change in the relative position between the light source and the scanner, which deteriorates the precision of the light beam and subsequently the image quality of printed images.
Innovation Solution
The optical scanning device incorporates a resin-molded casing with a fixed wall that includes a reinforcing part extending in the emission direction to continuously connect the light source and deflector fixing parts, stabilizing their relative positions and reducing resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the polygon scanner rotates at high speed, then the scanning speed and productivity are improved, but resonance is generated that changes the relative position between the light source unit and the polygon scanner, deteriorating the precision of the light beam and image quality
Solution Approach 1:
The patent applies curvature by designing the reinforcing part with an arch-like curved structure extending from the light source fixing part toward the polygon scanner fixing part. This curved reinforcement structure effectively resists the vibrational forces generated during high-speed rotation, maintaining structural integrity and preventing resonance-induced position changes while enabling high scanning speeds.
2Productivity
If the polygon scanner rotates at high speed, then the scanning speed is improved, but resonance is generated that changes the relative position between the light source unit and the polygon scanner, deteriorating the image quality of printed images
Solution Approach 1:
The arch-like curved reinforcing part provides structural reinforcement that suppresses resonance vibrations during high-speed rotation. This maintains the relative position between the light source and polygon scanner, ensuring consistent light beam precision and reliable image quality even at high scanning speeds.
3Device complexity
If the light source unit and polygon scanner are fixed to the bottom face part with ribs, then the device complexity is reduced, but the resonance caused by high-speed rotation changes the relative position between components
Solution Approach 1:
Instead of adding more ribs or complex support structures, the patent uses a single arch-like curved reinforcing part that efficiently connects the light source fixing part to the polygon scanner fixing part. This curved structure provides optimal mechanical reinforcement against rotational vibrations while maintaining simplicity in the overall device design.
4Reliability
If a reinforcing part is added to continuously connect the fixing parts, then the resonance is suppressed and image quality is maintained, but the device complexity increases
Solution Approach 1:
The arch-like curved reinforcing part is integrated into the existing casing structure, forming a continuous support path between the light source and polygon scanner fixing parts. This single curved element provides effective resonance suppression without requiring multiple separate components or complex assembly procedures, thus minimizing the increase in device complexity while ensuring reliable image quality.
Data Source
AI summary
An optical scanning device including: a light source part that is provided in a resin-molded casing and emits a laser beam; a deflector that is arranged in the casing and deflects and scans the laser beam, the deflector including, a rotary polygon mirror that reflects the laser beam, a driving source that rotates the rotary polygon mirror, and a substrate member; and the casing including, a fixed wall that extends in a direction perpendicular to a mirror surface of the rotary polygon mirror, a first fixing part that is provided to the fixed wall and fixes the light source part, a second fixing part that is provided to the fixed wall and fixes the substrate member, and a reinforcing part that is provided to the fixed wall and extends toward the emission direction so as to continuously connect the first fixing part and the second fixing part.