Liquid Discharge Head Substrate Delay Circuit Noise Reduction
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Solution Overview
Problem
Liquid discharge head substrates face issues with electromagnetic noise and ringing due to large currents flowing through power and ground lines, leading to malfunctions and deterioration in image printing quality.
Innovation Solution
A liquid discharge head substrate with a delay circuit that generates delay signals to stagger the enable signals for liquid discharge elements, alternately driving elements in forward and backward directions to reduce current changes and parasitic inductance effects, thereby minimizing electromagnetic noise and ringing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a plurality of liquid discharge elements are simultaneously driven, then productivity is improved, but electromagnetic noise and ringing occur due to large current changes
Solution Approach 1:
The liquid discharge elements are divided into multiple groups, and within each group, elements are driven in a sequential manner rather than simultaneously. This segmentation of the driving timing reduces the peak current change rate while maintaining overall productivity
Solution Approach 2:
The invention employs periodic driving patterns where enable signals are applied in a staggered fashion to different groups of liquid discharge elements. This periodic activation reduces electromagnetic noise by controlling the rate of current change
2Object-affected harmful factors
If enable signals are delayed for each liquid discharge element to reduce electromagnetic noise, then electromagnetic noise is reduced, but device complexity increases due to the need for delay circuits
Solution Approach 1:
The liquid discharge elements are divided into multiple groups, and within each group, elements are driven in a sequential manner rather than simultaneously. This segmentation of the driving timing reduces the peak current change rate while maintaining overall productivity
Solution Approach 2:
The invention employs periodic driving patterns where enable signals are applied in a staggered fashion to different groups of liquid discharge elements. This periodic activation reduces electromagnetic noise by controlling the rate of current change
3Object-affected harmful factors
If liquid discharge elements are driven sequentially to reduce current changes, then electromagnetic noise is reduced, but productivity decreases due to slower operation
Solution Approach 1:
The liquid discharge elements are divided into multiple groups, and within each group, elements are driven in a sequential manner rather than simultaneously. This segmentation of the driving timing reduces the peak current change rate while maintaining overall productivity
Solution Approach 2:
The invention employs periodic driving patterns where enable signals are applied in a staggered fashion to different groups of liquid discharge elements. This periodic activation reduces electromagnetic noise by controlling the rate of current change
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 effectively reduces electromagnetic noise and suppresses ringing, improving image printing quality by controlling the timing of liquid discharge element activation and reducing the circuit size of the liquid discharge head substrate.
Implementation Method 1
Electromagnetic noise may be caused by inductive coupling between the power line and the ground line at a rising edge and a falling edge of this large current
Implementation Method 2
a liquid discharge head substrate, a liquid discharge head, and a liquid discharge apparatus
Data Source
AI summary
A liquid discharge head substrate including liquid discharge elements constituting an element array along a first direction and a delay circuit configured to generate delay signals obtained by delaying an enable signal for driving the liquid discharge elements by different delay amounts is provided. The delay circuit includes a first circuit configured to start supplying delay signals to first group elements of the liquid discharge elements sequentially in a forward direction in the first direction and a second circuit configured to start supplying delay signals to second group elements of the liquid discharge elements sequentially in a backward direction in the first direction. In the element array, not less than one element included in the first group elements and not less than one element included in the second group elements are alternately arranged.