Piezoelectric Inkjet Switch Control Timing
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Solution Overview
Problem
Inkjet recording devices with piezoelectric elements face issues with simultaneous ON states of analog switches, leading to potential malfunctions and failures due to current flow differences between drive signals.
Innovation Solution
A recording device configuration that includes a control unit to output switch control signals that turn off both the first and second switches during a predetermined period, including the switching timing defined by a timing signal, thereby preventing simultaneous ON states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simultaneous ON prevention circuit is provided to prevent multiple switches from being ON simultaneously, then the reliability is improved, but the device complexity increases and costs increase
Solution Approach 1:
The control signal generation unit performs preliminary action by setting the control signal to a first level (OFF state) before the switching timing occurs. This ensures that when the latch signal causes the switch control signal to switch to the second level (ON state), the first switch has already been turned off, preventing simultaneous ON states without requiring additional prevention circuits
Solution Approach 2:
The control signal generation unit acts as an intermediary between the latch signal and the switch control signals. It introduces a timing offset by generating the switch control signals at different times relative to the latch signal, effectively mediating the switching process to prevent simultaneous ON states of multiple switches
2Reliability
If a simultaneous ON prevention circuit is provided to prevent multiple switches from being ON simultaneously, then the reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The control signal generation unit performs preliminary action by setting the control signal to a first level (OFF state) before the switching timing occurs. This ensures that when the latch signal causes the switch control signal to switch to the second level (ON state), the first switch has already been turned off, preventing simultaneous ON states without requiring additional prevention circuits
Solution Approach 2:
The control signal generation unit acts as an intermediary between the latch signal and the switch control signals. It introduces a timing offset by generating the switch control signals at different times relative to the latch signal, effectively mediating the switching process to prevent simultaneous ON states of multiple switches
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 prevents the simultaneous ON state of analog switches, thereby avoiding potential malfunctions and failures, and simplifies the circuit configuration, reducing costs.
Implementation Method 1
Some inkjet recording devices are equipped with a recording head that ejects ink from a nozzle by driving a piezoelectric element
Data Source
AI summary
Provided is a recording device which includes first and second output units outputting first and second drive signals for driving a piezoelectric element, first and second switches switching on or off the input of the first and second drive signals to the piezoelectric element, a selection output unit outputting selection information indicating which of the first and second drive signals is to be input to the piezoelectric element based on image data, and a control output unit outputting a switch control signal for controlling on and off of the first and second switches based on the selection information and a timing signal, wherein the switch control signal is a control signal for turning off the first and second switches during a predetermined period including a switching timing defined by the timing signal.