Table of Contents
Assignment background
The circuit boards and electronic components inside smartwatches are constantly exposed to environmental stressors such as external impacts, humidity, and temperature changes. The MEMS sensors and battery components in particular are extremely small and highly functional, so even the slightest external factor can lead to failure or performance degradation. Therefore, proper application of encapsulating materials is essential to ensure device reliability. However, applying low-viscosity potting materials like those used in this project posed the following challenges:
- Excessive flow and bleeding into small parts
Due to the extremely limited internal space, highly fluid materials could flow between components, potentially causing short circuits and poor heat dissipation. Furthermore, wasted material leads to increased weight and reduced battery life, compromising the performance of the final product. - Difficulty in precision coating of small parts
Low-viscosity encapsulants tend to flow easily and are difficult to control, so they are prone to bleeding and pooling on narrow and complex board shapes, making it difficult to consistently ensure uniform film thickness and reliable insulation.
Benefits
The combination of the SV51 needle valve for minute dispensing and the AXELIA automatic dispensing system has significantly improved the previous issues.
- Preventing excess flow and reducing material costs
The SV51 allows controlled micro-dispensing, ensuring stable application of only the required amount to the required area. This prevents excessive flow of low-viscosity materials, contributing to reduced material waste, lighter device weight, and longer battery life. - Stable discharge control even with low viscosity materials
Excellent minute amount control and liquid drainage prevent bleeding and pooling even with flowing materials, achieving uniform and sharp application even around small electronic components. - Achieving both process flexibility and productivity
AXELIA’s high-precision camera and intuitive programming function enable quick position correction even for complex board shapes. It can flexibly accommodate wearable products, which change over quickly, and contributes to improving yields and shortening lead times when starting up production.
Application video
Introduced products
Needle valve for minute dispensing SV51
It is capable of dispensing minute amounts at the 0.001cc level, ensuring stable application of even epoxy-based sealants. By preventing overapplication in small spaces and applying only the required amount precisely to the required area, it contributes to reducing material costs and improving reliability.
- Precise flow rate adjustment is possible even around small electronic components
- Compatible with potting materials, preventing liquid pooling and dripping
- Maintenance-free operation with millions of stable cycles
- Contributes to lighter and longer-lasting smartwatch circuit boards
High-precision automatic vision dispensing system AXELIA
A dispensing system that can handle complex and narrow layouts such as smartwatch boards. Height correction function using laser sensorThis allows for accurate detection of component height variations and stable recognition of the reference point, achieving uniform and reliable dispensing even around minute components. It can also flexibly accommodate mass production of wearable products, which require frequent design changes.
- Supports height correction using a laser sensor, enabling stable and uniform coating even on narrow substrates
- Prevents bleeding and over-application even with complex component layouts
- Rapid production start-up possible even with a short development cycle
- Achieving both compactness and high reliability in smartwatches
