Liquid Ejecting Head Single Atmosphere Path Crosstalk
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Solution Overview
Problem
The existing liquid ejecting heads face issues with crosstalk and strength deterioration due to multiple atmosphere opening paths, which affect the liquid ejection characteristics and reliability, particularly when multiple piezoelectric oscillators are driven simultaneously.
Innovation Solution
A liquid ejecting head design featuring a channel unit with pressure chambers and compliance units, where a single concave chamber is formed over multiple compliance units, and a reinforcing member is used to enhance the head case's strength, reducing the need for multiple atmosphere opening passages and minimizing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple atmosphere opening paths are formed through the head case to correspond to multiple runout concave portions, then the compliance units can function normally, but the strength of the head case is weakened
Solution Approach 1:
The patent merges multiple separate atmosphere opening paths into a single shared atmosphere opening path. The head case is designed with one common atmosphere opening path that serves multiple runout concave portions, eliminating the need for multiple separate paths. This combining approach maintains the atmospheric communication function for all compliance units while preserving the structural strength of the head case.
Solution Approach 2:
The single atmosphere opening path in the head case serves a universal function for multiple runout concave portions. Instead of dedicating a separate path to each compliance unit, the same atmosphere opening path is shared universally across all units, achieving multi-functionality with a single structural element.
2Reliability
If multiple atmosphere opening paths are formed through the head case, then each compliance unit can vent air, but oscillation is easily transferred between piezoelectric oscillators causing crosstalk
Solution Approach 1:
By combining multiple atmosphere opening paths into a single shared path, the patent reduces the number of openings in the head case. This merging minimizes the structural weaknesses and oscillation transfer paths that would exist with multiple separate openings, thereby reducing crosstalk between adjacent piezoelectric oscillators while maintaining proper venting function.
3Ease of operation
If multiple runout concave portions are formed in the head case, then air can escape from each compliance unit, but the head case strength is deteriorated
Solution Approach 1:
The patent combines multiple separate air venting openings into a single shared atmosphere opening path. This single opening serves all runout concave portions, maintaining the air venting ease of operation while avoiding the strength deterioration that would result from multiple separate openings in the head case structure.
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 design freedom and reliability of the liquid ejecting head by suppressing crosstalk and maintaining the strength of the head case, while also preventing liquid evaporation and maintaining consistent ejection characteristics.
Implementation Method 1
an oscillator unit having a piezoelectric oscillator capable of changing a capacity of the pressure chamber
Implementation Method 2
The compliance unit is formed in a state where an opening surface of the reservoir is sealed with an elastic film so that the pressure change of the ink in the reservoir is absorbed by elastic deformation
Data Source
AI summary
A liquid ejecting head includes a channel unit having a plurality of pressure chambers respectively communicating with a plurality of nozzles opened to a nozzle formation surface, a plurality of reservoirs for supplying liquid to the plurality of the pressure chambers, and a plurality of compliance units formed by partitioning at least a part of the surface of each reservoir opposite to the nozzle formation surface by a film member; and a head case joined to a surface of the channel unit. A concave chamber formed by depressing a part of a surface joined to the channel unit in a side opposite to the reservoir and an atmosphere opening passage whose one end communicates with the concave chamber and the other end is opened to the atmosphere are formed at the head case. The concave chamber is formed in series over the compliance units.