Is UV Adhesive Bonding?
UV adhesive bonding is an optical assembly technique in which two components are joined using a thin layer of UV-curable optical cement that hardens within seconds when exposed to ultraviolet light. Unlike thermal or two-part adhesives, UV cements remain liquid until deliberately cured, giving assemblers unlimited working time for precision alignment before triggering the curing reaction with a controlled UV exposure. Modern optical-grade UV cements — such as Norland NOA series, Dymax OP series, and EpoTek OG cements — offer refractive indices closely matched to common optical glasses, excellent transparency from 400 nm to 2000 nm, and long-term dimensional stability. UV bonding is the industry standard for high-volume production of cemented doublets, prism assemblies, fiber arrays, and optical modules where speed, precision, and repeatability are essential.
プロセス能力
- Bond Line Thickness: 5 – 50 µm (standard); 50 – 200 µm for gap-filling applications
- Alignment Accuracy: ±2 µm translational / ±10 arcsec angular
- UV Cure Time: 5 – 30 seconds (primary cure); post-bake optional for full strength
- 接着強度： 10 – 30 MPa (shear); 15 – 40 MPa (tensile)
- 伝送波面誤差： λ/4 – λ/10 (cement-dependent)
- 動作温度範囲： –55 °C to +125 °C (standard cements)
- Refractive Index Range: nd = 1.45 – 1.60 (index-matched formulations available)
対応素材
| 素材 | 代表的な等級 | |
|---|---|---|
| 1 | 溶融石英 | コーニング 7980 / 東ソー ES-2000 |
| 2 | 石英ガラス | SCHOTT Lithosil Q / Heraeus Suprasil 1 |
| 3 | ホウケイ酸ガラス | パイレックス 7740 / ボロフロート 33 |
| 4 | 光学ガラス | BK7 / N-BK7 / N-SF11 |
| 5 | サファイア | C面／A面 |
| 6 | CaF₂ | UV対応グレード／IR対応グレード |
| 7 | MgF₂ | UV対応グレード |
| 8 | 結晶化ガラス | ZERODUR |
| 9 | Crystal Optics | YAG / LiNbO₃ / KDP |
| 10 | 高分子光学 | PMMA / COP / COC |
| 11 | シリコン | compatible (opaque to UV — edge cure required) |
Adhesive Selection Guide
- Norland NOA 61: General-purpose, nd=1.56, 400–2000 nm transmission, high bond strength
- Norland NOA 88: Low-shrinkage, precision optics, high dimensional stability
- Norland NOA 170: High refractive index (nd=1.70), matched to high-index glasses
- Dymax OP-4-20632: Fast-cure, high-strength, mass-production applications
- EpoTek OG142: Low-stress, aerospace-grade, wide temperature range
- Custom Formulations: Index-matched cements available for specific glass pairs
代表的な用途
- Cemented Doublets & Triplets: Achromatic and apochromatic lens assemblies
- Prism Assemblies: Porro prisms, roof prisms, and beam-combining cubes
- Fiber Optic Arrays: V-groove fiber bonding and collimator assemblies
- Optical Modules: Camera modules, LiDAR sensors, and imaging systems
- 医療機器： Endoscope objectives and diagnostic optical assemblies
- Display Optics: AR/VR waveguide bonding and micro-display assemblies
カスタム仕様
We offer UV adhesive bonding for both prototype and high-volume production, with alignment systems ranging from manual precision fixtures to automated active-alignment platforms. Custom services include index-matched adhesive selection, controlled bond-line thickness, edge sealing, and post-cure thermal stabilization. All assemblies can be specified with environmental qualification (MIL-STD-810, Telcordia GR-468) for aerospace, defense, or telecom use. Each bonded assembly is delivered with alignment verification data, transmitted wavefront measurements, and full material traceability.
Bonding Method Comparison
