Odd Light Emitting Element Array Layout on Printed Circuit Board
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Solution Overview
Problem
The existing electrophotographic image forming apparatuses face challenges in managing an odd number of light emitting element arrays on a printed circuit board, leading to increased size and wiring congestion, as well as potential erroneous operations due to cross-talk between wiring lines.
Innovation Solution
The apparatus is designed with an odd number of light emitting element chips arranged such that an even number are on one side of the printed circuit board in the rotation direction and the remaining odd number on the other side, with the light emitting element intensity center shifted towards the side with the even number of chips, optimizing the layout to reduce board size and wiring congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an odd number of light emitting element arrays are arranged on the printed circuit board, then the image formation function is achieved, but the printed circuit board size increases and wiring congestion occurs
Solution Approach 1:
The patent applies asymmetry by intentionally creating an uneven distribution of light emitting element arrays on the printed circuit board. Specifically, one side has a different number of arrays compared to the other side, which allows for optimized wiring patterns that reduce overall board size while maintaining the required image formation function.
2Adaptability or versatility
If an odd number of light emitting element arrays are arranged on the printed circuit board, then the image formation function is achieved, but wiring congestion and cross-talk between wiring lines occur
Solution Approach 1:
The patent applies local quality by creating different wiring patterns and densities in different regions of the printed circuit board. Areas with higher concentrations of light emitting element arrays have correspondingly adjusted wiring patterns that optimize signal transmission while minimizing cross-talk and congestion.
3Adaptability or versatility
If an odd number of light emitting element arrays are arranged on the printed circuit board, then the image formation function is achieved, but erroneous operations due to cross-talk occur
Solution Approach 1:
The patent converts the potentially harmful effect of close spacing between light emitting element arrays (which causes cross-talk) into a beneficial arrangement by strategically positioning arrays to create natural separation zones in the wiring patterns. This reduces cross-talk and prevents erroneous operations while maintaining efficient image formation.
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 effectively suppresses the increase in printed circuit board size and wiring congestion, while minimizing the risk of erroneous operations by evenly distributing the light emitting element arrays, ensuring efficient image formation.
Implementation Method 1
an exposure head adopting, for example, a light emitting diode (LED) or an organic electroluminescent (organic EL) diode (OLED), to thereby form a latent image on the photosensitive drum
Implementation Method 2
an organic electroluminescent (organic EL) diode (OLED)
Implementation Method 3
a rod lens array configured to cause light beams from the rows of light emitting elements to form an image on the photosensitive drum
Implementation Method 4
exposing a photosensitive drum through use of an exposure head... to thereby form a latent image on the photosensitive drum
Data Source
AI summary
An image forming apparatus includes an exposure head having an odd number of chips in each of which a plurality of light emitting elements configured to expose a photosensitive member are arrayed at intervals corresponding to a first resolution in an intersecting direction intersecting with a rotation direction of the photosensitive member. An even number of chips of the odd number of chips are arranged on one side of the printed circuit board in the rotation direction, and a remaining odd number of chips of the odd number of chips are arranged on another side of the printed circuit board. A center of an intensity of a light amount of the odd number of chips in the rotation direction is shifted to a side of the even number of chips with respect to a center of the printed circuit board in the rotation direction.