Fluid Ejection Die Parameter Emulation With Thermal Tracking
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Solution Overview
Problem
Existing fluid ejection systems lack flexibility and compatibility in parameter shift characterization, limiting the integrity and performance of fluid ejection devices.
Innovation Solution
An integrated circuit is introduced to emulate parameters of a fluid ejection die based on temperature measurements or inferences, using thermal tracking logic to define emulated parameters such as voltage, current, or resistance, and outputting these parameters to a printer system via a closed-loop thermal control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parameter shift characterization is used to validate fluid ejection device integrity, then device reliability is improved, but system flexibility and compatibility are reduced
Solution Approach 1:
The patent creates a virtual copy of the fluid ejection die's electrical characteristics by measuring its actual electrical parameters (voltage, current, resistance) and storing them as lookup tables. This virtual model allows the system to emulate the die's behavior without physically modifying the actual die, thereby maintaining reliability while enabling flexibility through software-based parameter adjustment.
Solution Approach 2:
The system dynamically changes electrical parameters (voltage, current, resistance) based on temperature measurements and stored lookup tables. By adjusting these parameters according to temperature conditions, the system maintains device integrity while adapting to different operating conditions, thus resolving the contradiction between reliability and flexibility.
2Measurement precision
If temperature-based parameter emulation is implemented, then parameter accuracy is improved, but device complexity increases
Solution Approach 1:
The system uses the fluid ejection die's own temperature measurements to automatically adjust its electrical parameters. The die measures its own temperature and the controller uses this information to select appropriate parameters from lookup tables, eliminating the need for external complex calibration equipment and reducing overall system complexity while maintaining high accuracy.
Solution Approach 2:
The patent pre-stores electrical parameter lookup tables in memory before actual operation. These tables contain pre-calculated parameter values for different temperature conditions, allowing the system to quickly retrieve and apply appropriate parameters without performing complex real-time calculations, thus reducing computational complexity while maintaining precision.
3Stability of the object's composition
If closed-loop thermal control is used, then parameter stability is improved, but control complexity increases
Solution Approach 1:
The system continuously measures the fluid ejection die's temperature and uses this feedback information to select appropriate electrical parameters from lookup tables. This closed-loop feedback mechanism ensures parameter stability by automatically adjusting parameters in response to temperature changes, while the use of pre-stored lookup tables keeps the control logic simple and manageable.
Data Source
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Figure 3
Figure 4A~5
AI summary
An integrated circuit includes thermal tracking logic, control logic, and an output interface. The thermal tracking logic determines a temperature of a fluid ejection die. The control logic defines an emulated parameter of the fluid ejection die as a function of the temperature of the fluid ejection die. The output interface outputs the emulated parameter to a printer system based on the function and the temperature of the fluid ejection die.