Drive Circuit Board Layout Optimization for Liquid Ejection
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Solution Overview
Problem
Existing liquid ejection apparatuses using piezoelectric elements for image formation on a medium face challenges in efficiently arranging the drive circuit on the wiring board, leading to potential instability and inefficiencies in power consumption.
Innovation Solution
A drive circuit board configuration with a first switching circuit and a second switching circuit, each driven by a respective driver circuit, and a smoothing circuit to output a drive signal, where the frequency of the first drive signal is higher than the second, and the shortest distance between the first switching element and its driver circuit is shorter than the second, optimizing the layout on a wiring board with specific directional opposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive circuit is arranged on the wiring board without optimized layout, then the circuit can be implemented, but the operation stability is insufficient and power consumption increases
Solution Approach 1:
The patent applies local quality by making different parts of the drive circuit have different distance characteristics. Specifically, the first switching element is positioned closer to its driver circuit than the second switching element is to its driver circuit, creating localized optimization for high-frequency signal paths while maintaining overall circuit functionality.
Solution Approach 2:
The patent utilizes the spatial dimension of the wiring board by arranging components in a specific two-dimensional layout. The first and second switching elements are positioned at different locations along the first direction, with their distances to respective driver circuits optimized independently, transforming a one-dimensional circuit design into a two-dimensional spatial optimization problem.
2Manufacturing precision
If the drive circuit uses equal distance arrangement for switching elements and driver circuits, then the layout is simple, but the drive signal waveform accuracy and stability deteriorate
Solution Approach 1:
The patent implements local quality by assigning different distance characteristics to different switching elements based on their operational requirements. The first switching element operates at higher frequency and is positioned closer to its driver circuit, while the second switching element has a larger distance, creating locally optimized signal paths for each switching element.
Solution Approach 2:
The patent changes the spatial parameter (distance) between switching elements and driver circuits to optimize performance. By varying the distance parameter - making the first distance shorter than the second distance - the circuit achieves better waveform accuracy and stability without requiring complex additional components.
3Reliability
If the first switching element is positioned farther from its driver circuit, then the layout is more balanced, but noise interference increases and waveform stability decreases
Solution Approach 1:
The patent applies local quality by creating different spatial relationships for different switching elements. The first switching element, operating at higher frequency and more susceptible to noise, is positioned closer to its driver circuit to minimize noise interference and waveform distortion, while the second switching element has a different positioning that balances the overall layout.
Data Source
AI summary
A drive circuit board includes a first driver circuit configured to output a first drive signal, a first switching element configured to output a first switching signal, a second driver circuit configured to output a second drive signal, a second switching element configured to output a second switching signal corresponding to the first switching signal, and a smoothing circuit configured to output a drive signal obtained by smoothing the second switching signal, wherein the wiring board includes a first side and a second side located so as to be opposed to each other along a first direction, a frequency of the first drive signal is higher than a frequency of the second drive signal, and a distance between the first switching element and the first driver is shorter than a distance between the second switching element and the second driver circuit.