Liquid Jetting Head Flow Channel Orthogonal Design
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Solution Overview
Problem
The existing liquid discharge heads for inkjet printing suffer from misalignment of liquid drops due to non-orthogonal discharge holes and flow channels, leading to deviations in discharge direction and reduced printing accuracy.
Innovation Solution
The liquid discharge head design features a flow channel structure where the end close to the pressurizing chamber is oblique with respect to the discharge hole, but the portion close to the discharge hole is approximately orthogonal, minimizing deviations in discharge direction by ensuring the flow channel is mostly orthogonal to the discharge hole surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the flow channel is connected obliquely from the pressurizing chamber to the discharge hole, then the structural complexity is reduced and manufacturing is easier, but the liquid discharge direction deviates from the orthogonal direction causing misalignment
Solution Approach 1:
The flow channel is divided into two distinct segments: a first flow channel portion extending obliquely from the pressurizing chamber, and a second flow channel portion extending orthogonally to the discharge hole surface. This segmentation allows each portion to serve its specific function - the oblique first portion facilitates manufacturing while the orthogonal second portion ensures accurate discharge direction, thereby resolving the contradiction between ease of manufacture and printing accuracy.
2Manufacturing precision
If the flow channel is made orthogonal to the discharge hole surface throughout, then printing accuracy is improved, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The flow channel exhibits different geometric properties at different locations: the first flow channel portion has an oblique configuration for manufacturing simplicity, while the second flow channel portion near the discharge hole has an orthogonal configuration for discharge accuracy. This local differentiation of geometric quality allows the structure to optimize for different functions in different regions, resolving the contradiction between structural simplicity and printing accuracy.
3Device complexity
If the discharge holes are disposed non-orthogonally to simplify the flow channel structure, then device complexity is reduced, but the liquid drops are discharged in deviated directions causing misalignment on the recording medium
Solution Approach 1:
The flow channel structure transitions from a single-plane oblique configuration to a multi-dimensional configuration by introducing a second flow channel portion that extends orthogonally to the discharge hole surface. This dimensional adjustment in the channel geometry corrects the discharge direction without requiring changes to the discharge hole arrangement, thereby maintaining structural simplicity while improving landing position accuracy.
Data Source
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AI summary
The present invention aims to provide a liquid discharge head that causes less deviation in a discharge direction of a liquid from a direction orthogonal to a discharge hole surface, and a recording device using the liquid discharge head. The liquid discharge head 2 of the present invention includes a discharge hole 8, a discharge hole surface 4-1 having an opening of the discharge hole 8, a pressurizing chamber 10, and a flow channel connecting the discharge hole 8 and the pressurizing chamber 10. The flow channel 13 includes a nozzle part 13a and a partial flow channel 13b. The partial flow channel 13b is formed so that a distance Dm between Cm and C1 in a planar direction is larger than 0.1 W [µm] and a distance D2 between C2 and C1 in the planar direction is 0.1 W [µm] or less, wherein W [µm] is a mean diameter, C1 is an area centroid on a side close to the nozzle part 13a, C2 is an area centroid at a position located 2W [µm] away from the side close to the nozzle part 13a, C3 is an area centroid on a side close to the pressurizing chamber 10, and Cm is an intersection of a straight line connecting C1 and C3, and a plane parallel to the discharge hole surface at a position located 2W [µm] away from the side close to the nozzle part 13a.