Liquid Discharge Head Recess Placement for Adhesive Blockage Prevention
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Solution Overview
Problem
In liquid discharge heads, adhesive can penetrate into the communicating channels when plates are bonded, causing blockages and reducing channel area, as no grooves are typically formed on the first plate to prevent cracking, and forming recesses on the second plate allows adhesive to enter the channels.
Innovation Solution
A liquid discharge head design featuring a channel member with a first plate having nozzles and a second plate with through holes and recesses on its surface, where the recesses are located on the first surface to prevent adhesive entry, and grooves are formed on other plates to allow adhesive escape, ensuring the channels remain unblocked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the communicating channel forming the recessed part is formed on the second surface of the second plate, then the air bubbles can be removed and stagnation of the ink can be prevented, but the adhesive may penetrate into the recessed part when the first plate and the second plate are bonded to each other, causing the communicating channel blockage or the channel area reduction
Solution Approach 1:
The recessed part is repositioned from the second surface (bottom side) of the second plate to the first surface (top side) of the second plate. This dimensional change in position allows the communicating channel to maintain its air bubble removal function while preventing adhesive penetration during bonding, as the recess is now on the surface that does not contact the first plate during assembly.
2Strength
If no grooves or the like for allowing the adhesive to escape are formed on the first plate, then cracking of the plate or the like can be prevented, but the adhesive cannot escape when bonded to the second plate with a recessed part
Solution Approach 1:
Grooves are selectively formed only on the first surface of the second plate (the surface with the recessed part), while the first plate maintains its plain surface without grooves. This localized modification allows adhesive to escape from the recess area on the second plate without compromising the structural integrity of the first plate, resolving the contradiction between bonding quality and cracking prevention.
Data Source
AI summary
There is provided a liquid discharge head, including: a channel member that includes a first plate and a second plate and is formed having individual channels and a common channel. The first plate is formed having nozzles. The second plate has a first surface and a second surface at a side opposite to the first surface. The second surface of the second plate is joined to the first plate. The second plate has through holes passing through the second plate from the first surface to the second surface. The second plate is formed having first recesses having ends connected to the through holes. The individual channels include: the nozzles; pressure chambers; descenders defined by the through holes and connecting the nozzles and pressure chambers; and communication channels defined by the first recesses and allowing the descenders to communicate with the common channel. The first recesses are formed in the first surface.