Piezoelectric Liquid Ejecting Head with Common Fixing Member
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Solution Overview
Problem
Existing liquid ejecting heads, such as ink jet recording heads utilizing piezoelectric devices for longitudinal vibration, face challenges in reducing size and component count, which affects printing density and efficiency.
Innovation Solution
The design incorporates two rows of pressure generating chambers and piezoelectric devices on a common fixing member with a flexible signal line film that supplies driving signals to both sets of devices, sharing components and reducing the number of components, and includes a leg portion for adjusting device height and supporting reaction forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate fixing members and signal line films are used for each row of piezoelectric devices, then electrical connection and signal supply are ensured, but the number of components increases and device size increases
Solution Approach 1:
The patent combines two separate fixing members into one common fixing member that supports both rows of piezoelectric devices. Similarly, two separate signal line films are merged into one signal line film that supplies signals to both rows, thereby reducing the total number of components while maintaining proper electrical connections to all piezoelectric devices
Solution Approach 2:
The common fixing member serves multiple functions: it provides mechanical support for both rows of piezoelectric devices, ensures proper positioning, and facilitates electrical connections to all devices. The single signal line film also performs multiple functions by routing signals to both rows of piezoelectric devices through its flexible structure
2Reliability
If separate fixing members and signal line films are used for each row of piezoelectric devices, then each device is properly supported and connected, but the overall device size increases
Solution Approach 1:
By merging the support structure into a single common fixing member and consolidating signal routing into one flexible film, the patent reduces the spatial footprint required for mounting and wiring piezoelectric devices, thereby decreasing the overall device size while maintaining proper support and connections
Solution Approach 2:
The flexible signal line film utilizes three-dimensional routing capabilities to reach both rows of piezoelectric devices from a single location, effectively using vertical and lateral space more efficiently rather than requiring separate planar connections for each row
3Device complexity
If a common fixing member and single signal line film are used for both rows of piezoelectric devices, then device size is reduced and component count decreases, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by providing specific bonding structures at critical locations on the common fixing member, such as protrusions that fit into corresponding recesses in the support substrate, ensuring precise positioning only where needed rather than requiring high precision throughout the entire component
4Device complexity
If a common fixing member and single signal line film are used for both rows of piezoelectric devices, then device size is reduced, but assembly precision requirements increase
Solution Approach 1:
The common fixing member incorporates localized positioning features such as protrusions and recesses at specific bonding locations, which guide proper alignment during assembly without requiring the entire component to be manufactured with high precision, thereby facilitating easier assembly
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 a more compact size, higher printing density, and reduced component count, enhancing the efficiency and assembly of the liquid ejecting head.
Implementation Method 1
piezoelectric devices (piezoelectric vibrators) are longitudinally provided on a region opposed to pressure generating chambers... The longitudinal vibration is generated by applying voltage to the piezoelectric devices
Implementation Method 2
The longitudinal vibration is generated by applying voltage to the piezoelectric devices. The piezoelectric devices of such ink jet recording head are accommodated in accommodating portions of a head case
Implementation Method 3
a signal line film which has input terminals through which a driving signal for driving the first and second piezoelectric devices is supplied from the outside and output terminals through which the driving signal is supplied to the first and second piezoelectric devices
Data Source
AI summary
A liquid ejecting head includes: first and second pressure generating chambers which are provided in parallel on a flow path forming substrate such that each of the first and second pressure generating chambers forms a row so as to communicate with nozzle openings for ejecting liquids; first and second piezoelectric devices which causes the volumes of the first and second pressure generating chambers to change, respectively, through a vibration plate formed on the flow path forming substrate; a common fixing member which is arranged between the first and second piezoelectric devices at a position opposite to the first and second pressure generating chambers, a part of each of the first and second piezoelectric devices being bonded to the common fixing member; and a signal line film which has input terminals through which a driving signal for driving the first and second piezoelectric devices is supplied from the outside and output terminals through which the driving signal is supplied to the first and second piezoelectric devices, the signal line film having flexibility. In this case, the signal line film includes a first wiring portion having the input terminals and the output terminals for supplying the driving signal to the first piezoelectric device at one side face of the fixing member, and a second wiring portion extending from the first wiring portion to the other side face of the fixing member and having the output terminals for supplying the driving signal to the second piezoelectric devices.