Reflection Mirror Support Protrusions for Resonance Control
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Solution Overview
Problem
The existing light scanning apparatuses in image forming devices face challenges in stabilizing the natural frequency of the reflection mirror, leading to resonance issues due to vibrations from the driving system, which results in image quality deterioration, especially when the natural frequency coincides with the vibration frequency generated by the driving sources.
Innovation Solution
The method involves forming an optical box with protrusions along the longitudinal direction of the reflection mirror, where specific protrusions are processed to be out of contact with the mirror, allowing for precise adjustment of the natural frequency by selecting non-processed protrusions for support, thereby preventing resonance with the driving system's vibration frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reflection mirror is fixed using conventional support structures with multiple contact points, then the mirror is securely held in place, but the natural frequency of the mirror coincides with the vibration frequency from the driving system, causing resonance and image quality deterioration
Solution Approach 1:
The support structure is segmented into multiple protrusions arranged along the longitudinal direction of the reflection mirror. By selectively contacting only specific protrusions (e.g., every other protrusion), the support system divides the mirror into independent support zones, allowing control over the mirror's vibration characteristics and natural frequency to avoid resonance with the driving system.
2Object-affected harmful factors
If the natural frequency of the reflection mirror is adjusted to avoid resonance, then vibration-induced image quality deterioration is prevented, but the support structure becomes more complex requiring selective processing of protrusions
Solution Approach 1:
Different protrusions in the support structure have different functions: some protrusions are processed to be out of contact with the mirror for vibration isolation, while other protrusions remain unprocessed to provide stable support. This local differentiation allows the system to achieve both stability and vibration control without requiring complete structural redesign.
3Ease of manufacture
If all protrusions are left unprocessed to simplify manufacturing, then the support structure is easier to manufacture, but the natural frequency control is insufficient leading to potential resonance issues
Solution Approach 1:
Instead of processing all protrusions (excessive action) or none (insufficient action), the invention applies partial processing to only the necessary protrusions. Specifically, every other protrusion is processed to be out of contact, which is sufficient to achieve the desired natural frequency control and prevent resonance, while minimizing the complexity of the manufacturing 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 allows for accurate control of the reflection mirror's natural frequency, preventing vibration-induced resonance and improving image quality by ensuring the natural frequency does not coincide with the driving system's vibration frequency, thus stabilizing the image forming process.
Implementation Method 1
vibration generated by the driving system propagates also to the light scanning apparatus through the movable portions, and that the reflection mirror 162 vibrates
Implementation Method 2
the natural frequency of the reflection mirror coincides with the vibration frequency generated by the driving sources, which results in image quality deterioration
Data Source
AI summary
A method of manufacturing a light scanning apparatus, including: forming an optical box having a plurality of protrusions arranged along a longitudinal direction of a reflection mirror and provided at positions corresponding to one end side and the other end side of the reflection mirror in the longitudinal direction, respectively; processing protrusions except protrusions that are used for supporting the reflection mirror so that the protrusions except the protrusions that are used for supporting the reflection mirror on the one end side and on the other end side of the reflection mirror are out of contact with the reflection mirror; placing the reflection mirror on the protrusions that have not been processed in the processing; and fixing the reflection mirror, which has been placed on the protrusions that have not been processed in the placing, to the optical box.