Setpoint Registers for Fluidic Die Temperature Control
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Solution Overview
Problem
Printing devices face challenges in maintaining consistent fluid ejection characteristics and print quality due to temperature variations within silicon dies, as the resistive heaters increase the die's temperature, altering fluidic properties and viscosity.
Innovation Solution
Incorporating temperature sensors, setpoint registers, and comparator modules to adjust firing pulses based on temperature differences, ensuring optimal temperature control across zones of the fluidic die, thereby maintaining consistent fluid ejection and print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resistive heaters are used to eject printing fluid, then fluid ejection is achieved, but temperature of the silicon die increases altering fluidic properties
Solution Approach 1:
The patent implements a feedback control system where temperature sensors continuously monitor the silicon die temperature, and the controller adjusts the firing pulse width accordingly. When temperature exceeds the setpoint, the controller reduces the firing pulse width to decrease heating, and when temperature is below setpoint, it increases the firing pulse width to enhance fluid ejection. This closed-loop feedback mechanism resolves the contradiction by dynamically balancing fluid ejection capability with temperature control.
Solution Approach 2:
The patent employs dynamic adjustment of firing pulse parameters based on real-time temperature conditions. Instead of using fixed pulse widths, the system dynamically modifies the firing pulse width according to the current die temperature, allowing optimal fluid ejection at varying temperature conditions while preventing thermal runaway and maintaining consistent printing quality.
2Productivity
If temperature increases during firing, then fluid ejection occurs, but fluidic characteristics and viscosity change affecting print quality
Solution Approach 1:
The feedback control system continuously monitors temperature and adjusts firing pulse parameters to maintain consistent fluid ejection characteristics. By keeping the die temperature within the optimal range through real-time adjustments, the system ensures that fluid viscosity and other fluidic properties remain stable, thereby maintaining consistent print quality across the printing process.
Solution Approach 2:
The patent changes the firing pulse parameters (width, amplitude) based on temperature conditions to compensate for changes in fluidic characteristics. When temperature rises causing increased viscosity, the system adjusts the firing parameters to maintain the same ejection force, ensuring consistent drop weight and print quality despite temperature variations.
3Reliability
If temperature control is implemented with sensors and comparators, then temperature management improves, but device complexity increases
Solution Approach 1:
The patent implements a feedback control system where temperature sensors continuously monitor the silicon die temperature, and the controller adjusts the firing pulse width accordingly. When temperature exceeds the setpoint, the controller reduces the firing pulse width to decrease heating, and when temperature is below setpoint, it increases the firing pulse width to enhance fluid ejection. This closed-loop feedback mechanism resolves the contradiction by dynamically balancing fluid ejection capability with temperature control.
Solution Approach 2:
The control system is designed to be self-regulating, automatically adjusting firing parameters based on temperature feedback without requiring external intervention. The temperature sensors, comparators, and controller work together in an autonomous manner to maintain optimal operating conditions, reducing the need for complex external control mechanisms while ensuring reliable temperature management.
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 allows for precise temperature management, stabilizing fluid ejection characteristics and improving print quality by dynamically adjusting firing pulses to compensate for thermal variations, ensuring consistent drop weight and quality throughout the printing process.
Implementation Method 1
a resistive heater is placed in the orifice. The resistive heater may cause a drive bubble to form within the fluid chambers causing a metered amount of printing fluid to be ejected out of the orifice
Implementation Method 2
Incorporating temperature sensors, setpoint registers, and comparator modules to adjust firing pulses based on temperature differences
Implementation Method 3
a detected temperature presented by the at least one temperature sensor is compared to the target temperature setpoint using a comparator module to get a firing pulse adjustment value
Data Source
AI summary
A fluidic die that includes at least one temperature sensor coupled to at least one zone of the fluidic die, a setpoint register to receive a target temperature setpoint for the fluidic die wherein a detected temperature presented by the at least one temperature sensor is compared to the target temperature setpoint using a comparator module to get a firing pulse adjustment value, and a firing pulse used to convey an amount of fluid within the die is adjusted using the firing pulse adjustment value.