Integrated Liquid Ejecting Head with Film Damper
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Solution Overview
Problem
Existing liquid ejecting head units, such as ink jet recording heads, are large due to the separate configuration of the liquid flow channel unit and head body, which limits miniaturization and increases size.
Innovation Solution
The liquid flow channel unit is integrated with the head body, overlapping with the wiring substrate to form a direct communication flow channel, using a film member with a damper function and a resin body member to suppress liquid pulsation, and is positioned between the connecting substrate and head body to utilize dead space effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the liquid flow channel unit is separately provided from the head body and connected through another flow channel, then the damper function can be provided, but the overall size of the liquid ejecting head unit becomes large
Solution Approach 1:
The liquid flow channel unit is integrated with the head body into a single unified structure. The flow channel is formed directly within the head body, eliminating the need for separate connection components such as tubes or external flow channels. This merging of the liquid flow channel unit and head body maintains the damper function while significantly reducing the overall size and simplifying the structure of the liquid ejecting head unit
2Volume of moving object
If the liquid flow channel unit is integrated with the head body, then the overall size is reduced, but the wiring substrate arrangement becomes more constrained
Solution Approach 1:
The wiring substrate is arranged in a direction substantially perpendicular to the liquid ejection direction, utilizing the vertical space above the nozzle plate. This three-dimensional arrangement allows the wiring substrate to be positioned in the dead space region without interfering with the integrated liquid flow channel unit, thus resolving the spatial conflict between miniaturization and wiring layout
3Ease of manufacture
If the film member is fixed to the body member without tension, then the assembly is simple, but the pulsation of liquid cannot be suppressed effectively
Solution Approach 1:
A film member made of elastic material is used to form part of the pressure chamber wall. The film member is stretched and fixed to the body member in a tensioned state, allowing it to elastically deform in response to liquid pulsation. This flexible film structure effectively absorbs pressure fluctuations while maintaining a relatively simple assembly process
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 allows for miniaturization of the liquid ejecting head unit, effective suppression of liquid pulsation, and improved printing quality by using the adjacent space efficiently and providing a cooling mechanism for the driving circuit.
Implementation Method 1
an ink jet recording head in which ink droplets are discharged from a nozzle opening by using a pressure created by a piezoelectric element displacement
Implementation Method 2
to absorb the pulsation through a warp of the film member
Data Source
AI summary
A liquid ejecting head unit includes a head body which discharges liquid droplets; a wiring substrate which stands in a predetermined direction different from the discharging direction of the liquid from the head body in order to supply a driving signal, which drives the head body, to the head body; and a liquid flow channel unit which is disposed at a position overlapping with the wiring substrate in the predetermined direction, is integrally combined with the head body so that the flow channel is in direct communication with the head body, and includes a pressure chamber having a damper function of which at least a portion of wall surface is formed of a film member.