Piezo Inkjet Drive Circuit Layout for Stable DC Voltage Output
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Solution Overview
Problem
Existing liquid ejecting apparatuses with piezoelectric elements face malfunctions due to suboptimal circuit arrangements within the drive circuit, leading to instability in the operation of integrated circuits used in these systems.
Innovation Solution
The proposed solution involves a drive circuit with an integrated circuit that includes a modulation circuit, a switching circuit, a discharge circuit, a constant voltage output circuit, and an output terminal, where the constant voltage output circuit and discharge circuit are electrically coupled to the output terminal, with the shortest distance between the output terminal and the constant voltage output circuit being shorter than the distance to the discharge circuit, optimizing the circuit layout to improve stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge circuit is electrically coupled to the output terminal with a shorter distance, then the reliability of the liquid ejecting apparatus is improved, but the wiring layout complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the electrical coupling distances of different circuits to the output terminal. The discharge circuit is positioned with a shorter distance than the constant voltage output circuit, creating localized optimization for the discharge path. This asymmetric arrangement prioritizes rapid charge discharge capability while maintaining overall circuit functionality, resolving the contradiction between reliability improvement and layout complexity.
2Speed
If the constant voltage output circuit is electrically coupled to the output terminal with a longer distance, then the discharge circuit can be optimized for faster response, but the wiring impedance increases
Solution Approach 1:
The patent implements local quality by creating differentiated electrical coupling distances for different circuit functions. The discharge circuit uses a shorter coupling distance to minimize impedance and maximize discharge speed, while the constant voltage output circuit accepts a longer distance as its function does not require the same response time. This localized optimization resolves the contradiction between discharge speed and impedance loss.
3Productivity
If multiple circuits are integrated into a single integrated circuit, then the productivity of the liquid ejecting apparatus is improved, but the risk of malfunction increases
Solution Approach 1:
The patent resolves the integration contradiction by applying local quality to the internal circuit arrangement. While multiple circuits are integrated into a single IC for productivity, the discharge circuit is given preferential treatment with a shorter electrical coupling distance to the output terminal. This localized optimization ensures that the most critical function (discharge) has the best possible performance within the integrated structure, maintaining reliability while achieving integration benefits.
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 reduces wiring impedance and enhances the accuracy of the DC voltage signal, thereby stabilizing the operation of the integrated circuit and improving the reliability of the liquid ejecting apparatus.
Implementation Method 1
ink jet printers that use a piezoelectric element such as a piezo element
Data Source
AI summary
A liquid ejecting apparatus includes a drive element, and a drive circuit that outputs a drive signal that drives the drive element. The drive circuit includes an integrated circuit that outputs an amplification control signal, an amplifier circuit that output an amplified modulation signal, and a demodulation circuit that output the drive signal. The integrated circuit includes a modulation circuit that modulates the base drive signal to output a modulation signal, a discharge circuit that discharges a charge based on the drive signal, a constant voltage output circuit that outputs a DC voltage signal, and an output terminal from which the DC voltage signal is output. The constant voltage output circuit and the discharge circuit are electrically coupled to the output terminal, and a shortest distance between the output terminal and the constant voltage output circuit is shorter than a shortest distance between the output terminal and the discharge circuit.