Liquid Discharge Head Thermal Balance via Segmented Channels
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Solution Overview
Problem
The liquid discharge head is prone to temperature variations, particularly at the ends, which affect the discharge properties of the liquid, leading to reduced recording accuracy due to differences in viscosity and discharge characteristics across the pressurization chambers.
Innovation Solution
The liquid discharge head incorporates a first end channel with lower channel resistance, which minimizes the transmission of temperature variations to the pressurization chambers, ensuring consistent discharge properties by increasing the liquid flow rate and stabilizing the temperature across the head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the liquid discharge head uses conventional common channels for liquid supply, then the structure is simple, but the temperature variation at the ends affects discharge properties and recording accuracy
Solution Approach 1:
The common channel is segmented into a first common channel and a second common channel that extend in opposite transverse directions from the longitudinal center. This segmentation allows the liquid to flow through both channels, creating a thermal balance that reduces temperature variation at the ends of the liquid discharge head, thereby improving recording accuracy.
2Productivity
If the pressurization chambers are positioned at the ends, then the liquid flow path is shortened, but the temperature influence from outside increases
Solution Approach 1:
The second common channel acts as a thermal intermediary that counterbalances the temperature influence on the pressurization chambers at the ends. By having liquid flow through both the first and second common channels in opposite directions, the system creates a thermal equilibrium that reduces the harmful effect of outside temperature on the discharge properties.
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 reduces temperature differences within the pressurization chambers, enhancing recording accuracy by maintaining consistent discharge properties and stability, even under varying environmental conditions.
Implementation Method 1
a first common channel extending from a first end toward a center in a longitudinal direction of the liquid discharge head, and a second common channel extending from a second end toward the center in the longitudinal direction of the liquid discharge head
Implementation Method 2
cause liquid to flow from the first common channel to the second common channel through the pressurization chamber and circulate also outside even while not discharged, in order to prevent the channels to be clogged with retained liquid
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3
AI summary
It is an object of the present invention to provide a liquid discharge head configured to achieve decrease in temperature difference in the liquid discharge head, and a recording device including the liquid discharge head. A liquid discharge head 2 according to the invention includes a channel member 4 having a plurality of discharge holes 8, a plurality of pressurization chambers 10, and a plurality of common channels 20 and 24, and a plurality of pressurizing parts10. The plurality of common channels 20 and 24 extends in a first direction and configures a common channel group aligned in a second direction crossing the first direction, the common channels 20 and 24 are connected with the plurality of pressurization chambers 10 disposed along the common channels 20 and 24 among the plurality of pressurization chambers 50, and the channel member 4 is disposed outside, in the second direction, with respect to the common channel group, and further includes a first end channel 30 extending in the first direction, and the first end channel 30 is lower in channel resistance than the common channels 20 and 24.