Inkjet Recording Head Grounding Wire Insulation
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Solution Overview
Problem
Conventional inkjet recording heads face issues with electrode short-circuiting and high production costs due to the use of excessive conductive adhesive, which requires additional steps for shaping and control.
Innovation Solution
The inkjet recording head employs a flexible flat cable with individual wires connected to individual electrodes and a grounding wire, supported by an insulating layer, which electrically connects to a conductive member or frame, eliminating the need for large amounts of conductive adhesive and reducing production costs by preventing short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of conductive adhesive is used to connect the cavity unit to the common electrode, then electrical connection is ensured, but the adhesive may spread over the piezoelectric actuator and cause short-circuiting of surface electrodes
Solution Approach 1:
The patent introduces a grounding wire as an intermediary component between the cavity unit and the common electrode. This grounding wire serves as a mediator that provides a controlled electrical connection path without requiring excessive conductive adhesive, thereby preventing adhesive spread and potential short-circuiting while ensuring reliable grounding.
Solution Approach 2:
The patent segments the electrical connection function into distinct components: the grounding wire for electrical connection and the insulating layer for isolation. This segmentation allows the grounding wire to provide controlled conductivity where needed while the insulating layer prevents unwanted adhesive spread, resolving the contradiction between connection reliability and short-circuit prevention.
2Ease of manufacture
If a large amount of conductive adhesive is applied to the side surface of the piezoelectric actuator, then electrical connection is achieved, but additional stopping is required to control the shape of the adhesive
Solution Approach 1:
The grounding wire acts as an intermediary that simplifies the manufacturing process by providing a pre-formed electrical connection element. This eliminates the need to apply and control large amounts of conductive adhesive, thereby reducing production complexity while maintaining ease of electrical connection.
Solution Approach 2:
The patent replaces the mechanical application and shaping of conductive adhesive with a more straightforward mechanical assembly process involving the grounding wire. This substitution eliminates the need for additional stopping steps to control adhesive shape, simplifying the manufacturing process while ensuring reliable electrical connection.
3Reliability
If conductive adhesive is used to connect the cavity unit to the common electrode, then grounding is achieved, but the production cost increases due to additional stopping for adhesive control
Solution Approach 1:
The grounding wire serves as an intermediary component that provides reliable grounding without requiring the costly additional stopping steps needed to control conductive adhesive. This mediator approach maintains grounding reliability while reducing production costs by eliminating complex adhesive control processes.
Solution Approach 2:
The grounding wire represents a simple, cost-effective component that replaces the more expensive and complex conductive adhesive application process. By using this disposable-like component, the patent achieves reliable grounding without the high production costs associated with adhesive control stopping.
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 design effectively prevents electrode short-circuiting and reduces production costs by eliminating the need for extensive adhesive use and shaping control, while ensuring the inkjet recording head remains grounded to prevent electrical damage.
Implementation Method 1
an inkjet recording head having a piezoelectric actuator (i.e., an actuator unit) that includes a continuous piezoelectric sheet
Implementation Method 2
the conductive adhesive electrically connects the cavity unit to the common electrode, so that both the cavity unit and the common electrode are grounded
Data Source
AI summary
An inkjet recording head including a channel unit which includes an electrically conductive member and has a plurality of pressure chambers which communicate with a plurality of nozzles, respectively; a plurality of individual electrodes which are associated with the plurality of pressure chambers, respectively; and a flexible flat cable including a plurality of individual wires which are electrically connected to the plurality of individual electrodes, respectively, a grounding wire which is held at a ground potential, and an electrically insulating flexible layer which supports the individual wires and the grounding wire. The grounding wire includes an extension portion which is electrically connected to the electrically conductive member of the channel unit, and the electrically insulating flexible layer includes a projection portion which supports a portion, or an entirety, of the extension portion of the grounding wire.