Circular Shift Register for Thermal Zone Selection
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Solution Overview
Problem
Existing fluid ejection systems face inefficiencies in managing and controlling the temperature of multiple thermal zones within a fluidic die, leading to unnecessary complexity and expense in thermal zone selection and control.
Innovation Solution
A circular shift register is used to sequentially select thermal zones for processing by shared thermal control circuitry, allowing for continuous and efficient temperature control through a token-based system that advances once processing is complete, thereby minimizing thermal overshoot or undershoot and optimizing energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional thermal zone selection methods are used, then temperature control can be achieved, but system complexity and interconnection requirements increase
Solution Approach 1:
The patent segments the thermal zones into distinct regions (e.g., first thermal zone, second thermal zone) that can be independently selected and controlled. Each thermal zone has dedicated heating elements and temperature sensors, allowing selective activation of only the required zones. This segmentation reduces overall system complexity by enabling modular control while maintaining precise temperature management in each segment through independent control circuits.
2Use of energy by stationary object
If multiple thermal zones are controlled simultaneously, then comprehensive temperature management is achieved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic thermal zone selection where the system adaptively activates only the thermal zones that are currently needed based on real-time printing operations. A control circuit selectively enables heating elements in specific thermal zones while disabling others, creating a dynamic power management system. This dynamic approach allows the system to maintain versatile thermal zone coverage capability while significantly reducing energy consumption by avoiding simultaneous control of all zones.
3Productivity
If thermal zones are processed sequentially, then energy efficiency improves, but processing speed may be reduced
Solution Approach 1:
The patent implements continuous sequential processing of thermal zones where the control system transitions smoothly from one thermal zone to the next without idle periods. As one thermal zone completes its heating cycle, the system immediately activates the next required thermal zone, maintaining continuous useful action. This approach maximizes productivity by eliminating downtime between zone processing while minimizing energy waste through precise timing and immediate transition to the next active zone.
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 approach enables efficient and cost-effective thermal zone management, reducing the complexity and cost of interconnections, while ensuring precise temperature control and energy modulation for fluidic actuators, thereby improving the overall performance of fluid ejection systems.
Implementation Method 1
A circular shift register including a plurality of memory elements is disclosed. Each memory element of the circular shift register may be associated with one of the multiple thermal zones. A token bit may circulate within the circular shift register such that only one thermal zone is selected at a time for processing by the shared thermal control circuitry.
Implementation Method 2
The fluidic die may include at least one resistive element that generates heat in a thermal zone.
Data Source
AI summary
Examples of a fluidic die for thermal zone selection with a circular shift register are described herein. In some examples, the fluidic die includes multiple thermal zones. Each thermal zone includes a temperature sensor and a fluidic actuator. The fluidic die also includes shared thermal control circuitry to process an output of the temperature sensor of a selected thermal zone. The fluidic die further includes a circular shift register that includes multiple memory elements. Each memory element is associated with one thermal zone. A token circulates within the circular shift register to select one thermal zone at a time for processing by the shared thermal control circuitry.