Placement Tray Noise Isolation for Image Forming Apparatus Harnesses
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Solution Overview
Problem
In image forming apparatuses, cables supplying power from a power supply substrate to a control board can be influenced by noise from adjacent high-voltage boards, leading to reduced image quality.
Innovation Solution
The placement tray is used to separate low-voltage power supply harnesses from high-voltage boards, thereby reducing the influence of high-voltage noise on the power supply harnesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cable is disposed adjacent to the high-voltage board for compact arrangement, then the device complexity is reduced, but the cable is influenced by noise from the high-voltage board leading to reduced image quality
Solution Approach 1:
The patent divides the internal space into distinct regions by placing the high-voltage board and low-voltage power supply harnesses on opposite sides of the placement tray. This spatial segmentation separates components with different electrical characteristics, reducing electromagnetic interference while maintaining compact overall structure.
Solution Approach 2:
The placement tray serves as an intermediary structure that physically separates the high-voltage board and low-voltage power supply harnesses. By positioning these components on opposite sides of the tray, the tray acts as a barrier that reduces noise influence without requiring additional shielding materials or complex routing.
2Ease of operation
If the low-voltage power supply harnesses and high-voltage board are both disposed in one side of the placement tray, then the ease of operation is improved, but the influence of high voltage to the low-voltage power supply harnesses increases
Solution Approach 1:
Instead of separating components within the same plane, the patent utilizes the vertical dimension by placing harnesses and boards on opposite sides of the placement tray. This three-dimensional arrangement maintains ease of assembly while effectively reducing electromagnetic coupling between high-voltage and low-voltage components.
3Reliability
If the placement tray interposes between the low-voltage power supply harnesses and high-voltage board, then the reliability is improved by reducing noise influence, but the device complexity increases
Solution Approach 1:
The placement tray performs multiple functions: it supports the high-voltage board, provides structural rigidity to the device housing, and simultaneously acts as a noise barrier by positioning components on opposite sides. This multi-functionality improves signal quality without adding separate shielding structures or increasing overall device complexity.
Data Source
AI summary
An image forming apparatus includes a placement tray, an image forming unit, a drive unit, a control board, a power supply substrate, a high-voltage board, and low-voltage power supply harnesses. The placement tray holds a recording sheet thereon. The image forming unit forms an image on the recording sheet. The drive unit supplies driving force to the image forming unit. The control board controls the drive unit. The power supply substrate supplies electric power to the control board. The high-voltage board is disposed in one side of the placement tray. In the high-voltage board, voltage is generated higher than voltage in the power supply substrate. The low-voltage power supply harnesses are disposed in another side of the placement tray so as to supply electric power from the power supply substrate to the control board.