Parallel Coil Demodulation Circuit for Stable Ink Ejection Drive
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Solution Overview
Problem
The existing drive circuits for liquid ejecting apparatus, particularly those using class D amplifier systems, face challenges in outputting sufficient current while minimizing power consumption and heat generation, leading to potential instability and distortion in the drive signal, which can degrade ink ejection accuracy.
Innovation Solution
The drive circuit incorporates a demodulation circuit with two coils electrically coupled in parallel, where one coil overlaps the other in a direction normal to the substrate, allowing for efficient current dispersal and reduced power consumption, thereby maintaining signal accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the amount of current that the drive circuit can output is set to the same level as the amount of current that is supplied to the drive element, then the amount of heat generated by the inductor element is reduced, but the feedback current in the drive circuit decreases and the operation of the drive circuit becomes unstable
Solution Approach 1:
The inductor element is divided into two separate inductor elements (first inductor element and second inductor element) that are electrically coupled in parallel. This segmentation allows the drive circuit to output sufficient current while reducing the current flowing through each individual inductor element, thereby reducing heat generation without compromising feedback current and operational stability.
2Productivity
If the number of nozzles in the print head is increased to improve print quality and printing speed, then the productivity is improved, but the amount of current based on the drive signal increases and the amount of heat generated by the inductor element increases
Solution Approach 1:
The single inductor element is segmented into two parallel inductor elements, which allows the circuit to handle higher total current requirements for increased nozzle counts while distributing the current load to reduce heat generation in each individual inductor element.
3Use of energy by moving object
If a class D amplifier circuit is used to reduce power consumption, then the use of energy is improved, but when the amount of current based on the output drive signal increases, the amount of current flowing through the inductor element increases and the amount of heat generated by the inductor element increases
Solution Approach 1:
The inductor element in the class D amplifier circuit is divided into two parallel inductor elements, maintaining the energy efficiency benefits of the class D amplifier while reducing the current burden and heat generation in each individual inductor element when high current output is required.
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 enables the drive circuit to output sufficient current while minimizing power consumption and heat generation, enhancing the accuracy and stability of the ink ejection process.
Implementation Method 1
the demodulation circuit includes a first coil and a second coil electrically coupled in parallel with the first coil, and wherein the first coil is positioned so as to overlap at least part of the second coil in a direction normal to the first face
Data Source
AI summary
A liquid ejecting apparatus includes a drive circuit that outputs a drive signal, wherein the drive circuit includes a modulation circuit that modulates a base drive signal to output a modulation signal, an amplifier circuit that amplifies the modulation signal to output an amplified modulation signal, a demodulation circuit that demodulates the amplified modulation signal to output the drive signal, and a substrate on which the modulation circuit, the amplifier circuit, and the demodulation circuit are provided, wherein the substrate includes a first face and a second face opposite to the first face, wherein the demodulation circuit includes a first coil and a second coil electrically coupled in parallel with the first coil, and wherein the first coil is positioned so as to overlap at least part of the second coil in a direction normal to the first face.