Ink Jet Print Head Temperature Detection Crosstalk Reduction
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Solution Overview
Problem
Ink jet printing apparatuses face challenges in accurately acquiring print head temperature due to crosstalk from control signals, especially when the lines for control signal transmission and temperature sensing are shared, leading to inaccurate temperature readings.
Innovation Solution
The apparatus includes a print head with a diode sensor for temperature detection, a transmission unit for drive control signals, a temperature detection unit to read the diode sensor output, and a correction unit to determine and apply a correction amount based on different drive conditions, ensuring accurate temperature measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a part of a line used for transmission of a drive control signal and a part of a line connected with a diode sensor are made in common, then cost is reduced, but temperature detection accuracy deteriorates due to crosstalk from control signals
Solution Approach 1:
The patent divides the drive control signal transmission into multiple segments with different timing. By segmenting the signal transmission in time domains and assigning different timing characteristics to different signal components, the system can separate the temperature sensor readout from the drive control signals, eliminating crosstalk while maintaining shared physical lines
Solution Approach 2:
The patent employs periodic action by timing the temperature sensor readout to occur during specific periods when drive control signals are not being transmitted. The controller periodically reads the diode sensor output during inactive periods of the printing element drive cycle, ensuring that temperature detection occurs free from crosstalk interference while using the same shared lines
2Reliability
If a temperature sensor is provided to the print head to acquire temperature during printing, then temperature control capability is improved, but measurement accuracy deteriorates due to induced noise from data transfer clock, transfer data, and latch signal
Solution Approach 1:
The system uses periodic action by scheduling temperature sensor readout during specific time windows within the printing cycle. The controller is configured to read the diode sensor output during periods when data transfer clocks and control signals are inactive, thereby periodically acquiring temperature data free from noise interference while maintaining continuous temperature control capability
Solution Approach 2:
The patent introduces timing control as an intermediary mechanism that mediates between the temperature sensor and the drive control system. By using the controller to timing-coordinate the readout operations, the system separates the temperature detection function from the noisy control signal environment without requiring additional physical isolation infrastructure
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 accurate temperature acquisition of the print head regardless of drive conditions, minimizing the impact of data transfer noise and ensuring consistent image density during printing.
Implementation Method 1
a diode sensor for detecting a temperature of the substrate
Data Source
AI summary
An object of the present disclosure is to acquire an accurate temperature of a print head. The present disclosure is an ink jet printing apparatus comprising a print head, a transmission unit configured to transmit a control signal, and a detection unit configured to detect a temperature by reading an output of a Di sensor after the transmission, and as drive conditions for driving a printing element, there is a plurality of drive conditions whose driving cycle of the printing element is different from one another, within a predetermined period in length in accordance with the driving cycle, transmission of a control signal and temperature detection are performed, a part of a line used for transmission of the control signal and a part of a line connected with the Di sensor are in common.