Piezoelectric Drive IC Layout for Stable Liquid Ejection Signals
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Solution Overview
Problem
Existing liquid ejecting apparatuses with piezoelectric elements face malfunctions due to suboptimal circuit arrangements within the integrated circuit, leading to instability in the operation of the drive circuit.
Innovation Solution
The proposed solution involves a drive circuit with an integrated circuit that includes a modulation circuit, a switching circuit, a constant voltage output circuit, and a feedback circuit, where the modulation circuit and constant voltage output circuit are electrically coupled to an input terminal without intersecting each other, and the amplifier circuit operates based on amplification control signals to generate and demodulate drive signals for the piezoelectric elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the modulation circuit and constant voltage output circuit are arranged in an integrated circuit for driving piezoelectric elements, then the functionality and integration are improved, but the circuit stability and operation reliability deteriorate due to potential signal interference and suboptimal layout
Solution Approach 1:
The patent introduces a virtual line segment as an intermediary concept to represent signal transmission paths. By ensuring that virtual line segments connecting the input terminal to the modulation circuit and constant voltage output circuit do not intersect, the design indirectly manages signal interference without requiring physical separation. This mediator approach allows integrated functionality while maintaining signal integrity through logical path separation.
Solution Approach 2:
The patent transitions from considering only physical spatial arrangement to incorporating the dimension of signal transmission paths (virtual lines). By evaluating circuit layout in terms of both physical positions and signal path intersections, the design adds a conceptual dimension for analyzing and preventing signal interference, thereby improving reliability while maintaining integration.
2Device complexity
If multiple circuits (modulation circuit, constant voltage output circuit, amplifier circuit, demodulation circuit) are integrated in a single integrated circuit, then device complexity is reduced, but manufacturing precision and circuit layout difficulty increase
Solution Approach 1:
The patent employs feedback mechanisms where the output of the demodulation circuit is fed back to the modulation circuit, and the constant voltage output circuit provides reference voltage feedback. This feedback loop ensures that signal integrity is maintained despite the integrated layout, allowing precise control of piezoelectric elements while keeping all circuits on a single chip.
Solution Approach 2:
The constant voltage output circuit provides a stable reference voltage (equipotential) to other circuits in the integrated circuit. This equipotential reference point helps stabilize the operation of the modulation circuit and amplifier circuit, reducing the impact of layout variations and manufacturing tolerances on overall circuit performance.
3Object-affected harmful factors
If the virtual line segments are arranged to avoid intersection, then signal interference is reduced, but the circuit layout area and design complexity increase
Solution Approach 1:
The patent applies partial separation of signal paths by ensuring only specific virtual line segments (those connected to the input terminal) do not intersect. Other parts of the circuit can be more densely packed, achieving a balance between reducing signal interference and minimizing overall circuit area. This partial application of non-intersection constraint optimizes the trade-off between signal quality and area efficiency.
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 enhances the stability and accuracy of the drive signals for the piezoelectric elements, improving the reliability and efficiency of ink ejection in the liquid ejecting apparatus.
Implementation Method 1
a piezoelectric element such as a piezo element... the liquid ejecting apparatus including the piezoelectric element ejects a predetermined amount of ink from the nozzle corresponding to the piezoelectric element
Data Source
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AI summary
A liquid ejecting apparatus includes a drive circuit. The drive circuit includes an integrated circuit, an amplifier circuit, a demodulation circuit, and a feedback circuit. The integrated circuit includes a modulation circuit, a constant voltage output circuit, and an input terminal to which the feedback signal is input. The modulation circuit and the constant voltage output circuit are coupled to the input terminal, a first virtual line segment located between the input terminal and the constant voltage output circuit in a first virtual straight line connecting the input terminal and the constant voltage output circuit at a shortest distance does not intersect the modulation circuit, and a second virtual line segment located between the input terminal and the modulation circuit in a second virtual straight line connecting the input terminal and the modulation circuit at a shortest distance does not intersect the constant voltage output circuit.