Thermal Inkjet Printhead Heater Life via Segmented Address Cycling
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Solution Overview
Problem
The life of ink ejector heaters in thermal inkjet printheads is reduced due to additional use and activity when using non-nucleating heating (NNH) for pre-heating, leading to uneven temperature distribution and potential print quality issues.
Innovation Solution
A method involving a binary intensity word is applied to selected ink ejectors for non-nucleating heating, where the word is configured to modulate heat intensity by cycling through a series of addresses, ensuring balanced heating across the printhead, thereby extending heater life and maintaining uniform temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If non-nucleating heating (NNH) is used to pre-heat the printhead, then the desired operating temperature is achieved within acceptable time, but the life of the heaters in the ink ejectors is reduced
Solution Approach 1:
The printhead heaters are divided into multiple groups corresponding to different address cycles. The binary intensity word selectively activates heating in different groups during different address cycles, segmenting the heating load across multiple heater sets rather than continuously stressing a single set of heaters.
Solution Approach 2:
The heating is applied periodically through repeated address cycling, with the binary intensity word modulating which heaters are active during each cycle. This periodic activation allows heaters to rest between cycles, extending their operational life while maintaining pre-heat effectiveness.
2Stability of the object's composition
If non-nucleating heating (NNH) is applied to all ink ejectors, then uniform temperature distribution is achieved, but the heater life is reduced due to additional use and activity
Solution Approach 1:
Heaters are segmented into multiple groups that are activated in different address cycles. The binary intensity word controls which groups are heated during each cycle, ensuring all heaters contribute to temperature uniformity over time without all being active simultaneously, thus extending individual heater life.
Solution Approach 2:
Multiple heater groups are combined through the address cycling mechanism to achieve the effect of uniform heating across the entire printhead. By cycling through different groups and applying heat to each, the system merges their contributions to achieve overall temperature uniformity.
3Reliability
If substrate heater is used to maintain operating temperature, then additional silicon real estate is required, but heater life is preserved
Solution Approach 1:
The ink ejector heaters are made multi-functional by using them both for ink ejection and for pre-heating/maintaining temperature. Through the binary intensity word and address cycling, these existing heaters perform dual functions, eliminating the need for separate substrate heater elements and preserving silicon real estate.
Solution Approach 2:
The ink ejector heaters serve themselves by performing both their primary function (ink ejection) and secondary function (temperature maintenance). The system uses the existing heater infrastructure for temperature control without requiring additional dedicated heating elements.
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 extends the life of ink ejector heaters and ensures consistent print quality by uniformly distributing heat across the printhead, reducing temperature variations and maintaining a desired operating temperature.
Implementation Method 1
configuring a binary intensity word for applying non-nucleating heating to selected ink ejectors of the plurality of ink ejectors of the printhead
Data Source
AI summary
A method for controlling a printhead for printing and maintaining a desired operating temperature of the printhead during the printing, the printhead having a plurality of ink ejectors and a plurality of addresses employed for ejecting ink from the plurality of ink ejectors, wherein each address of the plurality of addresses corresponds to a particular subset of the plurality of ink ejectors, includes configuring a binary intensity word for applying non-nucleating heating to selected ink ejectors of the plurality of ink ejectors of the printhead; repeatedly sequentially cycling through the plurality of addresses for the printing with the printhead; and repeatedly applying the binary intensity word while performing the repeated sequentially cycling through the plurality of addresses.