Liquid Droplet Ejection Head Temperature Detection via Relay Substrate Voltage Conversion
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Solution Overview
Problem
Existing liquid droplet ejection heads face challenges in accurately detecting temperature due to errors caused by long wiring distances, high impedance, and noise interference in the transmission path between temperature detection devices and control sections, which affects the precision of temperature detection and ejection operations.
Innovation Solution
A control device for liquid droplet ejection heads that includes a head substrate with ejection openings, a head controller, a relay substrate for electrical connection, and a voltage conversion circuit on the relay substrate to convert temperature-dependent resistance values into output voltages, allowing for accurate temperature detection and adjustment of drive voltages for improved ejection characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature detection device is mounted on the same supporting body as the electro-thermal conversion body, then temperature detection capability is provided, but measurement precision deteriorates due to errors caused by long wiring distances, high impedance, and noise interference
Solution Approach 1:
The patent combines the voltage conversion circuit with the temperature detection device on the same relay substrate, integrating multiple functions into a single unit. This merging reduces the number of separate components and wiring connections, thereby reducing noise interference and improving measurement precision while managing device complexity.
Solution Approach 2:
The patent introduces a voltage conversion circuit as an intermediary component that converts the resistance value (which changes with temperature) into an output voltage. This intermediary conversion process enables more accurate temperature detection by providing a signal that is less susceptible to wiring-related noise and impedance issues.
2Measurement precision
If the wiring distance between temperature detection device and control section is reduced, then measurement precision improves, but device complexity increases due to compact integration requirements
Solution Approach 1:
The patent merges the voltage conversion circuit and temperature detection device onto the same relay substrate, effectively reducing the wiring distance between components. This integration improves measurement precision by minimizing signal transmission issues while managing integration complexity through standardized substrate mounting.
Solution Approach 2:
The relay substrate serves multiple functions: it provides mechanical support for the temperature detection device, electrical connections for signal transmission, and housing for the voltage conversion circuit. This multi-functionality reduces the need for separate components and wiring, thereby improving measurement precision without proportionally increasing device complexity.
3Measurement precision
If a voltage conversion circuit is added to convert resistance values into output voltages, then measurement precision improves, but device complexity increases due to additional circuit components
Solution Approach 1:
The voltage conversion circuit acts as an intermediary that transforms the resistance value (which has poor signal characteristics for direct measurement) into an output voltage (which has excellent signal characteristics). This conversion significantly improves measurement precision by providing a stronger, more noise-resistant signal while adding only a single circuit module rather than multiple separate components.
Solution Approach 2:
The voltage conversion circuit is integrated into the relay substrate that already exists for connecting the liquid droplet ejection head to the control device. By utilizing the existing relay substrate infrastructure, the patent adds the voltage conversion function without requiring separate wiring harnesses or additional connection points, thereby improving measurement precision while minimizing the increase in overall device complexity.
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 solution enables highly accurate temperature detection and adjustment of drive voltages, leading to enhanced ejection characteristics and improved print quality by reducing the need for dedicated temperature detection elements and minimizing noise interference.
Implementation Method 1
a voltage conversion circuit disposed in the relay substrate, wherein the voltage conversion circuit converts a resistance value, which changes in accordance with a temperature of the head substrate, into an output voltage
Data Source
AI summary
A control device of controlling a liquid droplet ejection head includes a head substrate; a head controller applying a drive voltage to the head substrate to control the ejection of liquid droplets; a relay substrate connecting the head substrate and the head controller; a main-body controller controlling the head controller; and a voltage conversion circuit disposed in the relay substrate. Further, the voltage conversion circuit converts a resistance value in accordance with a temperature of the head substrate into an output voltage, the relay substrate inputs the output voltage into the main-body controller, and the main-body controller detects the temperature based on the output voltage and determines the drive voltage based on the detected temperature.