Segmented LED Exposure Cable Routing for Noise Reduction
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Solution Overview
Problem
In image forming apparatuses, the long high-power cables required for connecting LED heads to control substrates lead to noise interference and complex wiring, necessitating expensive shielding and significant space for routing.
Innovation Solution
The apparatus is designed with a shorter high-power cable configuration, using multiple first cables for signal lines connecting LED units to a control substrate and a single second cable for connecting the control substrate to the main substrate, reducing the need for shielding and simplifying wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plurality of cables are laid over a long distance from the control substrate to the LED heads, then power and signals can be supplied to the LED heads, but the cable length increases leading to noise interference and complex wiring
Solution Approach 1:
The patent segments the single long cable into multiple shorter cables, with each cable connecting the control substrate to a specific LED head. This segmentation reduces the length of individual cables, minimizing noise interference while maintaining reliable power and signal transmission to each LED head independently
Solution Approach 2:
The patent reorganizes the wiring from a single long cable routing to multiple shorter cables that can be routed through different paths and dimensions within the apparatus, reducing wiring complexity and improving space utilization while maintaining electrical connectivity
2Power
If high-power cables are used to supply power to LED heads, then sufficient power can be delivered, but noise interference with adjacent cables increases
Solution Approach 1:
By segmenting the power delivery system into multiple shorter cables, each cable carries power over a reduced distance, which minimizes electromagnetic noise generation and interference with adjacent cables while still delivering sufficient power to each individual LED head
Solution Approach 2:
The control substrate acts as an intermediary that distributes power to multiple LED heads through separate shorter cables, rather than using a single long cable, thereby reducing noise interference while maintaining power delivery capability
3Reliability
If multiple cables are routed from the control substrate to LED heads, then electrical connections can be established, but space for cable routing must be ensured increasing device complexity
Solution Approach 1:
The patent segments the cable routing into multiple shorter individual cables, each occupying minimal space, rather than requiring a single long cable or large cable bundle, thereby reducing the overall volume required for cable routing while ensuring reliable electrical connections
Data Source
AI summary
An image forming apparatus includes: a lower body including a plurality of photosensitive members and having an opening; an upper body which is configured to open and cover the opening; a plurality of exposure units which are supported by the upper body and which are opposed to the photosensitive members when the cover covers the opening; a main substrate provided in the housing; an exposure control substrate which is provided to the upper body and controls light emission of the exposure units; a plurality of first cables which electrically connect the exposure units to the exposure control substrate, respectively, each of the first cables including a plurality of signal lines; and a second cable which electrically connects the exposure control substrate to the main substrate and which includes at least one signal line, a number of which is smaller than a total number of the signal lines included in the first cables.