Connection Status Output Circuit for Recording Head Noise Reduction
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Solution Overview
Problem
Conventional connection status output circuits in recording heads generate noise during recording operations, affecting data signals and causing recording defects due to signal changes related to the clock signal during ink discharge.
Innovation Solution
A recording head with a connection status output circuit that maintains a non-changing output signal during recording operations, preventing interference with other signals by configuring the circuit to only output the connection status signal when confirming the connection status and keeping it static during actual recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connection status output circuit performs logical operations between recording signal, clock signal and control signal to confirm electrical connection status, then connection status monitoring is achieved, but noise is generated during recording operations affecting data signals
Solution Approach 1:
The patent extracts the harmful output signal generation during recording operations by introducing a control mechanism that prevents the connection status output circuit from outputting signals during recording. The circuit is configured to output connection status signals only during connection confirmation mode, not during recording operations, thereby removing the noise source while preserving the monitoring function.
Solution Approach 2:
The patent applies dynamics by making the output circuit's behavior conditional based on operational mode. The connection status output circuit dynamically adjusts its operation: it outputs signals during connection confirmation but suppresses output during recording operations. This dynamic control eliminates noise during recording while maintaining monitoring capability during connection setup.
2Reliability
If the connection status output circuit outputs signals during recording operations, then connection status is continuously monitored, but recording defects occur due to signal interference
Solution Approach 1:
The patent removes the harmful signal output during recording operations while preserving the monitoring function. By configuring the circuit to suppress output signals during recording mode, the patent eliminates the source of recording defects caused by signal interference, while the monitoring capability remains active during connection confirmation phases.
Solution Approach 2:
The patent implements periodic action by alternating the circuit's output behavior between different operational phases. During connection confirmation phase, the circuit outputs signals for monitoring; during recording phase, it suppresses output to prevent interference. This periodic switching ensures both monitoring reliability and recording quality are maintained at appropriate times.
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 configuration prevents noise from affecting recording signals, ensuring accurate and reliable recording operations by maintaining a constant output signal during ink discharge.
Implementation Method 1
an electrothermal conversion element (heater) and allow droplets to be discharged by an operation of film boiling. The configuration is such that an electrothermal conversion element is disposed within an ink chamber, and an electric pulse acting as a recording signal is supplied to this element to heat it, whereby thermal energy is supplied to the liquid
Implementation Method 2
allow droplets to be discharged by an operation of film boiling
Implementation Method 3
by utilizing bubble pressure of liquid caused by a phase change of liquid when bubbled, very small droplets are discharged from a tiny discharge aperture (nozzle) to perform recording on a recording medium
Data Source
AI summary
In a connection status output circuit for confirming the connection status with a recording apparatus via connecting terminals corresponding respectively to recording signal DATA, clock signal CLK for transferring the recording signal, and control signals LT and HE for controlling a recording operation according to the recording signal, the signals being received from the recording apparatus, when the connection status is confirmed, a signal designating the connection status is outputted, and when a recording operation is performed, the output signal does not change.