Precision application of UV adhesives in AR/VR headset optical components

In small, precision devices like AR/VR headsets, the assembly of lenses and screens is a crucial process that directly impacts product performance and user experience. Optical components in particular require minute dimensional precision and high transparency, so poor adhesion or distortion can lead to visual distortion and reduced optical performance. Therefore, precise and uniform application of UV adhesives is essential.
However, conventional coating processes have the following challenges:

• Lack of uniformity in narrow coating width
  The application width was very narrow, about 0.2 to 1.0 mm, making it difficult to apply the UV adhesive evenly. Any unevenness posed a risk of insufficient adhesive strength or optical defects.
• Adverse effects on optical performance
  When variations in coating thickness cause minute distortions in lenses or screens, transparency and image quality deteriorate, posing a problem that directly affects the performance of the entire device.
• Air bubbles and liquid pools
  If air bubbles or liquid pools occur in the small application areas, they can impair optical transparency after curing and reduce long-term reliability.

The introduction of the SV59MD needle valve for ultra-fine dispensing and the AXELIA high-precision automatic dispensing system has resulted in the following improvements:

• Uniform and stable micro-application
  The SV59MD allows for minute control of the amount of adhesive applied, down to the nanoliter minimum, achieving uniform application even in narrow areas around lenses and screens, while maintaining both adhesive strength and optical performance.
• Ensuring optical performance
  Accurate application prevents uneven film thickness and distortion. Transparency is ensured, image quality is stable, and the product’s inherent optical performance can be maximized.
• Prevents air bubbles and improves reliability
  Excellent liquid drainage prevents air bubbles from entering and liquid pooling at the edges, resulting in a stable finish quality after curing and improved long-term adhesive reliability.
• Improving productivity
  AXELIA’s high-precision camera-based reference point correction and intuitive teaching enable quick response to complex optical component placements, contributing to improved yields and reduced man-hours when starting up mass production.

Needle valve for ultra-fine dispensing SV59MD

This high-precision dispenser is compatible with AR/VR headsets with complex structures. Its micro-dispensing needle valve structure ensures uniform dispensing even in extremely small adhesive areas. It also comes equipped with a calibration function for adjusting the nozzle, making it suitable for mass production of optical devices.

• Stable ultra-fine dot application even in narrow areas
• No dripping and reliable shutoff even around the lens
• Compatible with UV adhesives ideal for optical components
• High-precision calibration function minimizes positional variations

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.

• Height correction by laser sensor ensures uniform application
• Precision control suitable for optical components prevents bleeding and over-application
• Rapid mass production launch possible even with a short development cycle
• Achieving both miniaturization and high reliability in AR/VR devices