Liquid Ejecting Head High-Voltage Wiring Flame Retardant Isolation
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Solution Overview
Problem
Existing liquid ejecting heads lack electrical safety measures, particularly when high voltage is applied, which can lead to unexpected events.
Innovation Solution
A liquid ejecting head design that includes a storage unit, ejection nozzles, a drive unit, a housing, an electric circuit board with high-voltage wiring, and a flame retardant portion with a core member having a flame retardant grade of V−1 or more, ensuring electrical safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-voltage wiring is disposed in the electric circuit board, then the liquid ejecting head can be driven at relatively high voltage, but electrical safety cannot be ensured
Solution Approach 1:
The electric circuit board is segmented into distinct functional layers: a first electric circuit board for low-voltage control circuits, and a second electric circuit board for high-voltage drive circuits. This segmentation isolates high-voltage components from low-voltage control circuits, preventing electrical interference and safety hazards while maintaining both driving capability and electrical safety.
Solution Approach 2:
A insulation board is introduced as an intermediary component between the first electric circuit board (low-voltage) and the second electric circuit board (high-voltage). This insulation board provides electrical isolation, allowing high-voltage wiring to function while preventing dangerous electrical contact with low-voltage circuits, thus resolving the contradiction between power delivery and safety.
2Power
If high-voltage wiring is disposed in the electric circuit board, then the drive unit can operate at high voltage, but unexpected events may occur
Solution Approach 1:
The circuit board system is divided into separate high-voltage and low-voltage sections, with high-voltage wiring confined to the second electric circuit board. This segmentation prevents high-voltage interference with sensitive components and reduces the risk of unexpected events such as electrical breakdowns or component damage.
Solution Approach 2:
The insulation board serves as a protective intermediary between high-voltage and low-voltage circuits, preventing harmful electrical interactions that could cause unexpected events. This intermediary layer ensures that high-voltage operation does not compromise the reliability of the overall system.
3Power
If high-voltage wiring is disposed in the electric circuit board, then the element substrate can be driven effectively, but electrical isolation cannot be achieved
Solution Approach 1:
The electrical isolation requirement is solved by segmenting the circuit board into two separate boards: the first electric circuit board for low-voltage control and the second electric circuit board for high-voltage driving. This segmentation naturally achieves electrical isolation without requiring complex isolation mechanisms within a single board.
Solution Approach 2:
The insulation board acts as a simple intermediary structure that provides electrical isolation between the two circuit boards. This approach achieves effective electrical isolation through a straightforward design rather than complex isolation techniques, resolving the contradiction between power delivery and isolation requirements.
Data Source
AI summary
A liquid ejecting head capable of ejecting a liquid, has: a storage unit; an element substrate which includes ejection nozzles for ejecting the liquid supplied from the storage unit; a drive unit configured to drive the element substrate, which is supplied with electric power at a predetermined voltage; a housing configured to support the element substrate, the storage unit, and the drive unit; an electric circuit board in which a high-voltage wiring to which the predetermined voltage is applied is disposed; and a flame retardant portion which has a flame retardant grade of V−1 or more. The electric circuit board includes a core member which has a flame retardant grade of V−1 or more. The flame retardant portion is disposed on a side closer to the housing than the electric circuit board. The high-voltage wiring is disposed between the core member and the flame retardant portion.