Liquid Discharge Head Detection Surface Reflectance
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Solution Overview
Problem
Existing liquid discharge heads face challenges in ensuring reliable electrical connections due to the adherence of protective films on wiring electrodes, making it difficult to visually detect defects and maintain connection quality.
Innovation Solution
Incorporating a detection surface on the holding substrate with higher reflectance than the wiring electrode, adjacent to the opening, allows for visual detection of protective film adherence, ensuring complete sealing and preventing film formation on the wiring electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective film is applied to the wiring electrode to prevent oxidation and improve reliability, then the electrical connection reliability is improved, but the wiring electrode surface becomes indistinguishable from the protective film, making defect detection difficult
Solution Approach 1:
The patent applies a reflective film with higher reflectance than the protective film on the wiring electrode. This creates a visible contrast between the protective film and the reflective film, allowing defects such as peeling or incomplete coverage to be easily detected visually or with imaging devices, while the protective film remains intact for oxidation prevention.
Solution Approach 2:
The reflective film serves as an intermediary layer between the protective film and the wiring electrode substrate. It provides a reference surface with distinct optical properties that enables non-destructive inspection of the protective film's integrity without compromising the electrical connection reliability.
2Difficulty of detecting and measuring
If the wiring electrode surface is made highly reflective to improve defect detection, then defect visibility is improved, but the electrical connection properties may be compromised
Solution Approach 1:
The reflective film is applied locally to specific regions of the wiring electrode where defect detection is needed, rather than the entire electrode surface. This localized application maintains the electrical connection properties in critical areas while providing optical contrast for inspection in other areas.
Solution Approach 2:
The patent uses a composite structure combining the protective film (for oxidation resistance and electrical stability) with the reflective film (for defect detection). This composite approach leverages the complementary properties of both films to simultaneously achieve reliable electrical connections and easy defect detection.
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 solution enhances the reliability of electrical connections by allowing for easy detection of defects and preventing connection failures, thereby improving the overall quality and reliability of the liquid discharge head.
Implementation Method 1
a detection surface adjacent to the opening, the detection surface having a higher reflectance than a surface of the wiring electrode of the actuator substrate
Data Source
AI summary
A liquid discharge head is configured to discharge a liquid, and the liquid discharge head includes an actuator substrate and a holding substrate bonded to the actuator substrate. The actuator substrate includes a pressure generator, and a wiring electrode configured to electrically connect the pressure generator and an exterior of the liquid discharge head. The holding substrate includes an opening configured to expose the wiring electrode to the exterior of the liquid discharge head, and a detection surface adjacent to the opening, the detection surface having a higher reflectance than a surface of the wiring electrode of the actuator substrate.