Liquid Ejecting Apparatus Drive Signal and Power Transmission Interference
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Solution Overview
Problem
Existing liquid ejecting apparatuses face issues with electrical interference due to the use of overlapping frequency bands for drive signals and wireless power transmission, leading to disruptions in drive waveforms and printing quality, as well as charging problems such as excessive or insufficient charging.
Innovation Solution
A liquid ejecting apparatus with a drive signal generation circuit operating in a second frequency band that includes part of the first frequency band for power transmission, and a control circuit that restricts power transmission when the drive signal is generated, to prevent interference and stabilize ejection quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency switching is used to generate drive signal waveform, then liquid ejection capability is improved, but electrical interference with wireless power supply occurs
Solution Approach 1:
The system dynamically switches between two operational modes: high-frequency switching mode for liquid ejection and wireless power supply mode for charging. The control circuit determines the current operational state and activates the appropriate circuit configuration, allowing the system to adapt its behavior based on real-time requirements and avoid simultaneous operation of both circuits that would cause interference
Solution Approach 2:
The system changes the electrical parameters (frequency, circuit configuration) of the liquid ejecting section based on the operational state. During wireless power supply, the system switches to a different frequency band or circuit configuration that does not interfere with the power transmission frequency, thereby resolving the contradiction between maintaining ejection capability and avoiding electrical interference
2Adaptability or versatility
If wireless power supply and drive signal generation operate simultaneously, then power transmission function is improved, but drive waveform stability deteriorates
Solution Approach 1:
The control circuit dynamically manages the operational state of both wireless power supply and drive signal generation circuits. When wireless power supply is detected as the current state, the system adjusts the drive signal generation to use a different frequency band or disables it temporarily, ensuring stable power transmission without waveform disruption
Solution Approach 2:
The control circuit acts as an intermediary that coordinates between the wireless power supply circuit and the drive signal generation circuit. It monitors the operational state and mediates potential conflicts by switching frequency bands or timing the operation of both circuits, preventing direct interference while maintaining both functions
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 effectively suppresses electrical interference, ensuring stable liquid ejection and appropriate charging by prioritizing drive signal generation or power transmission, thereby improving printing quality and charging efficiency.
Implementation Method 1
a liquid ejecting section (piezoelectric element) that ejects liquid in response to a drive signal
Implementation Method 2
a non-contact power transmission circuit that transmits power in a non-contact manner by using the first frequency band
Data Source
AI summary
A liquid ejecting apparatus includes: a liquid ejecting section that ejects liquid in response to a drive signal; a drive signal generation circuit that generates the drive signal by using a second frequency band including at least a part of a first frequency band; a non-contact power transmission circuit that transmits power in a non-contact manner by using the first frequency band; and a control circuit that controls the drive signal generation circuit and the non-contact power transmission circuit, in which the control circuit restricts the power transmission by the non-contact power transmission circuit in a case where the drive signal generation circuit has generated the drive signal.