Exposure Device Dynamic Vibration Absorber
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Solution Overview
Problem
Exposure devices with LED print heads experience significant vibration issues, leading to banding and image defects due to external vibrations, particularly when the device resonates with these vibrations, causing instability in the exposure process.
Innovation Solution
An exposure device is designed with a dynamic vibration absorber that includes a weight and an elastic support portion, positioned to face the LED print head, which absorbs and dampens vibrations by matching its natural frequency to that of the print head, thereby reducing resonance and image defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the exposure section is positioned with LED print heads at both end portions to expose the photosensitive drum, then the exposure coverage is improved, but the exposure section becomes susceptible to external vibrations causing banding and image defects
Solution Approach 1:
A weight member is introduced as an intermediary element between the exposure section and the external environment. This weight member, when vibrated by external vibrations, generates inertial forces that counteract the vibrations transmitted to the exposure section, thereby protecting it from vibration-induced banding and image defects
Solution Approach 2:
The weight member is designed to vibrate in response to external vibrations affecting the exposure section. By matching the natural frequency of the weight member to the frequency of external vibrations, the system utilizes mechanical vibration principles to generate counteracting forces that cancel out harmful vibrations, reducing banding and image defects
2Reliability
If the exposure section resonates with external vibrations, then the vibration amplitude increases causing severe banding, but adding vibration suppression components increases device complexity
Solution Approach 1:
The weight member serves as a simple intermediary component that can be added to the existing exposure section without fundamentally redesigning the structure. It effectively suppresses resonance by generating counteracting inertial forces, thereby improving exposure stability while maintaining relatively simple device architecture
Solution Approach 2:
The mass of the weight member is specifically designed and adjusted to match the natural frequency of the exposure section. By changing the mass parameter of the weight member, the system optimizes vibration suppression effectiveness, reducing resonance amplitude and preventing severe banding while keeping the added complexity minimal
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
The dynamic vibration absorber effectively suppresses vibrations in the LED print head, reducing image defects and maintaining image quality by absorbing external vibrations, thus enhancing the stability of the exposure process.
Implementation Method 1
an elastic portion that is elastic and that is disposed between the exposure section and the weight to support the weight so as to be vibratable
Implementation Method 2
having a mass determined in advance... to support the weight so as to be vibratable
Data Source
AI summary
An exposure device includes an exposure section, a weight, and an elastic portion. The exposure section includes plural light emitting elements arranged along an axial direction of an image holding member that is rotatable, is positioned with respect to the image holding member at both ends in the axial direction, and exposes the image holding member to light by emitting light to the image holding member. The weight is disposed so as to face the exposure section, and has a mass determined in advance. The elastic portion is elastic, and is disposed between the exposure section and the weight to support the weight so as to be vibratable.