Drive Signal Circuit Layout for Thermal Isolation in Liquid Ejectors
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Solution Overview
Problem
The operation of the analog conversion circuit in a liquid ejecting apparatus becomes unstable due to heat generated by the transistor pair when generating drive signals for the liquid ejecting head, which can propagate and affect the circuit's performance.
Innovation Solution
The transistor pair and analog conversion circuit are separated onto different substrates, with the transistor pair on a first substrate and the analog conversion circuit on a second substrate, to prevent heat transfer and maintain circuit stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the transistor pair and analog conversion circuit are integrated on the same substrate, then the device complexity is reduced, but the heat generated by the transistor pair propagates to the analog conversion circuit causing unstable operation
Solution Approach 1:
The drive signal generation circuit is divided into two separate substrates: a first substrate for the transistor pair and a second substrate for the analog conversion circuit. This segmentation physically isolates the heat-generating component from the heat-sensitive component, preventing heat propagation while maintaining functional integration through inter-substrate signal transmission.
2Power
If the transistor pair generates drive signal with large amplitude, then the power output is improved, but heat generation increases causing temperature rise in the analog conversion circuit
Solution Approach 1:
The transistor pair, which is the primary heat source, is extracted from the same substrate as the analog conversion circuit and placed on a separate first substrate. This extraction removes the harmful thermal effect from the analog conversion circuit's environment while preserving the power generation function on the first substrate.
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 isolates the analog conversion circuit from heat generated by the transistor pair, ensuring stable operation and improved performance of the drive signal generation process.
Implementation Method 1
the transistor pair generates heat when generating the drive signal
Implementation Method 2
heat generated by the transistor pair may propagate to the analog conversion circuit
Data Source
AI summary
A liquid ejecting apparatus includes a liquid ejecting head that is driven by a drive signal to eject a liquid, a first substrate, a transistor pair that is provided on the first substrate and includes two bipolar transistors generating the drive signal, a second substrate, and an analog conversion circuit that is provided on the second substrate and converts a digital first waveform signal designating a waveform of the drive signal into an analog second waveform signal designating the waveform of the drive signal, in which the transistor pair generates the drive signal based on the second waveform signal, and the second substrate is provided to be separated from the first substrate.