Liquid Discharge Head Dummy Chamber Reliability
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Solution Overview
Problem
The liquid discharge head disclosed in existing technologies may experience leaks from damaged piezoelectric actuator substrates covering dummy pressurization chambers, leading to variations in channel properties and discharge properties, and potential circuit shorts.
Innovation Solution
The liquid discharge head incorporates a configuration with dummy pressurization chambers that are designed to reduce the risk of leaks by positioning them outside the area covered by the piezoelectric actuator substrate, using a second channel member to support the first channel member and prevent liquid from adhering to the substrate, and optimizing the channel resistance to minimize pressure differences and fluid crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piezoelectric actuator substrate covers the dummy pressurization chamber to maintain structural integrity and support, then the substrate may be damaged and cause liquid leakage, but if the substrate does not cover the dummy pressurization chamber, then the structural support is reduced
Solution Approach 1:
The channel member is divided into a first channel member and a second channel member. The first channel member contains the pressurization chambers and discharge holes, while the second channel member provides additional structural support and houses the common channel. This segmentation allows the piezoelectric actuator substrate to cover only the first channel member's pressurization chambers without needing to extend over dummy pressurization chambers, reducing leakage risk while maintaining structural integrity through the second channel member.
Solution Approach 2:
The second channel member acts as an intermediary structural element between the piezoelectric actuator substrate and the overall head assembly. It provides the necessary structural support and rigidity that would otherwise require the substrate to extend over dummy chambers, thereby preventing liquid leakage while maintaining head strength.
2Reliability
If the piezoelectric actuator substrate extends over dummy pressurization chambers to provide uniform support, then liquid leakage may occur from damaged substrate portions, but if the substrate is limited in extent, then support uniformity is reduced
Solution Approach 1:
The channel member is segmented into functional regions: the first channel member with pressurization chambers that require piezoelectric actuation, and the second channel member with common channels that require structural support. This segmentation allows the piezoelectric substrate to be limited to covering only the first channel member, preventing leakage while the second channel member provides the necessary structural uniformity.
Solution Approach 2:
The second channel member serves multiple functions: it provides structural support to the head assembly, houses the common channel for liquid supply, and compensates for the reduced coverage area of the piezoelectric actuator substrate. This multi-functionality allows the substrate to be smaller without compromising overall support uniformity.
3Reliability
If dummy pressurization chambers are included to maintain channel properties, then liquid leakage from damaged substrate causes variation in discharge properties, but if dummy chambers are excluded, then channel property stability is reduced
Solution Approach 1:
The dummy pressurization chambers are extracted from the first channel member and relocated to the second channel member. This extraction removes them from the region covered by the piezoelectric actuator substrate, eliminating the risk of liquid leakage from damaged substrate portions while preserving the channel property stability that dummy chambers provide.
Solution Approach 2:
The dummy pressurization chambers are moved from the vertical stacking dimension (first channel member) to another structural dimension (second channel member). This dimensional relocation allows the substrate to maintain its limited coverage area while dummy chambers continue to provide channel property stability in their new location.
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 enhances the reliability of the dummy pressurization chamber, stabilizes liquid supply and discharge, and reduces the likelihood of circuit shorts, thereby improving the overall performance and reliability of the liquid discharge head.
Implementation Method 1
a piezoelectric actuator substrate configured to pressurize the pressurization chamber
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3
AI summary
It is an object of the invention to provide a liquid discharge head configured to achieve improvement in reliability of a dummy pressurization chamber, 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 dummy pressurization chamber 10D2, as well as a substrate 40 having a plurality of pressurizing parts 50. The channel member 4 includes a pressurization chamber plate 4a, a dummy pressurization chamber plate 4b, and plates 4c to 41 being stacked. The pressurization chamber plate 4a has a hole, the hole has a side surface configuring a side surface of the pressurization chamber 10, and the hole has an opening configuring an opening of the pressurization chamber. The dummy pressurization chamber plate 4b has a hole, the hole has a side surface configuring a side surface of the dummy pressurization chamber 10D2, and the hole has an opening configuring an opening of the dummy pressurization chamber. The plurality of openings of the pressurization chambers is closed by the substrate 40, and the opening of the dummy pressurization chamber is closed by the pressurization chamber plate 4a.