Sound Absorbing Member Vertical Dimension Ejection Noise
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Solution Overview
Problem
Image forming apparatuses face challenges in reducing sound leakage from ejection ports, as existing sound absorbing members are primarily located inside the housing and do not effectively mitigate noise transmission to users.
Innovation Solution
The apparatus incorporates sound absorbing members with varying vertical dimensions and rib configurations on the upper walls, positioned closer to the ejection ports, to absorb and attenuate sound more effectively, combined with a sound reflection surface to direct noise away from the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound absorbing members are provided only inside the housing, then the structure is simple and manufacturing is easy, but sound transmission to the user is not effectively reduced
Solution Approach 1:
The sound absorbing member is extended from a two-dimensional configuration inside the housing to a three-dimensional structure that protrudes toward the ejection port. This dimensional extension allows the sound absorbing material to occupy the sound propagation path between the ejection port and the user, effectively reducing sound transmission without requiring complete structural redesign.
Solution Approach 2:
The sound absorbing member is configured with non-uniform properties: it has a first portion with a first vertical dimension and a second portion with a second vertical dimension that is greater than the first. This local variation in dimensions allows the structure to provide enhanced sound absorption at critical locations near the ejection port while maintaining simplicity in other areas.
2Object-affected harmful factors
If sound absorbing members are positioned closer to the ejection port with larger vertical dimensions, then sound transmission is reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The sound absorbing member is divided into a first portion and a second portion with different vertical dimensions. This segmentation allows each portion to be optimized for its specific function: the first portion provides base sound absorption, while the second portion with greater height provides enhanced absorption at the critical ejection port interface. The segmented design simplifies manufacturing compared to creating a single complex monolithic structure.
Solution Approach 2:
The vertical dimension parameter of the sound absorbing member is varied along its length, with the second portion having a greater vertical dimension than the first portion. This parameter change optimizes sound absorption efficiency at different locations without requiring complete redesign of the entire member, making manufacturing more feasible while achieving superior noise reduction.
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 configuration significantly reduces sound transmission to the user from ejection ports, providing a more effective noise suppression compared to traditional setups where sound absorbing members are only inside the housing.
Implementation Method 1
a sound absorbing member that is provided on an upper wall covering the medium placement section from above in the housing and that has a first portion and a second portion which is positioned closer to the ejection port than the first portion and which has a larger vertical dimension than the first portion
Data Source
AI summary
An image forming apparatus includes: a housing that has a forming section which is built therein and which forms an image on a recording medium, the housing having a medium placement section that is a bottom surface of a room, of which a front side in a backward direction is open, and an ejection port that ejects the recording medium, on which the image is formed, toward the room along a width direction intersecting with the backward direction; and a sound absorbing member that is provided on an upper wall covering the medium placement section from above in the housing and that has a first portion and a second portion which is positioned closer to the ejection port than the first portion and which has a larger vertical dimension than the first portion.