Liquid Jetting Head Driving Substrate Erect Orientation
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Solution Overview
Problem
The existing liquid jetting heads, such as ink jet-type recording heads, face challenges in downsizing due to the need for a driving substrate with a through-hole for flexible cable wiring, leading to increased size and volume, and potential short-circuit risks from clearance holes.
Innovation Solution
A liquid jetting head design where the driving substrate is arranged in an erect posture between communication liquid channels, eliminating the need for a through-hole and allowing for reduced substrate size, stable wiring, and minimized short-circuit risks by separating the substrate and liquid supply path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the driving substrate is provided with a through-hole for flexible cable wiring, then wiring between the driving substrate and pressure generating unit is accomplished, but the size of the driving substrate in plan view increases, resulting in a large driving substrate and increased entire volume of the liquid jetting head
Solution Approach 1:
The driving substrate is rotated from a planar arrangement to a vertical arrangement standing on its edge. This dimensional change allows the substrate to be positioned between the first and second communication liquid channels in the vertical direction, eliminating the need for through-holes and reducing the horizontal footprint while maintaining wiring capability through the flexible cable passing along the vertical edge.
2Ease of manufacture
If the driving substrate is provided with a through-hole, then flexible cable can pass through for wiring, but wiring patterns must be formed to detour around the through-hole, increasing the size of the driving substrate
Solution Approach 1:
By transitioning from a planar substrate layout to a vertical edge-standing configuration, the wiring paths no longer need to detour around through-holes. The flexible cable connects to terminals on the vertical edge of the substrate, eliminating the need for complex wiring patterns and reducing the required substrate area.
3Ease of manufacture
If the driving substrate is arranged horizontally with through-hole for flexible cable, then wiring is accomplished, but the horizontal size of the liquid jetting head cannot be reduced
Solution Approach 1:
The driving substrate is repositioned from a horizontal plane to a vertical orientation, utilizing the vertical dimension for wiring connections. This allows the horizontal area to be minimized while the flexible cable connects to the vertical edge, enabling compact horizontal sizing suitable for line-type heads.
4Ease of manufacture
If clearance holes are provided for wiring, then flexible cable can pass through, but short-circuit risks increase
Solution Approach 1:
The through-holes and clearance holes are completely removed from the driving substrate design. Instead, the flexible cable connects to terminals positioned on the vertical edge of the substrate, eliminating the holes that create short-circuit risks while maintaining the wiring connection functionality.
Data Source
AI summary
Disclosed is a liquid jetting head which can contribute to downsizing. A head unit 20 has two case channels and a driving substrate 28 arranged between inflow openings 35 of the case channels provided on a base surface of the head unit, which is on the opposite side of a nozzle-formed surface of the head unit, in an erect posture with respect to the base surface of the driving substrate 28.