Manufacturing Illumination Optics with Printoptical Technology

1. Introduction

Printoptical Technology is an additive process designed for producing large-format optics with complex features, textures, and freeform patterns. Using advanced drop-on-demand (DOD) inkjet methodologies combined with UV curing, it can generate transparent prisms, lenses, and textured optical surfaces directly from digital design input.

Unlike grinding or molding, Printoptical enables custom large-area optics in a fast, flexible, and cost-effective way, making it particularly suitable for prototyping and pre-series volumes of illumination optics.

2. Process Overview

Resin Deposition – Transparent photopolymer droplets (LUX resins) are dispensed with high spatial precision using inkjet heads.

Additive Build-Up – Droplets are deposited on top of one another in an additive fashion, gradually forming the optical geometry.

Texture Integration – Complex features, textures, or patterns can be incorporated directly during deposition.

Curing & Fusion – Each droplet is UV-cured after it has fully merged and blended with the surrounding material, creating a continuous, optically smooth surface.

3. Advantages

• Large-format capability: Optics up to 600 × 600 mm with complex textures and features.
• Tool-free manufacturing: Eliminates molds and blanks.
• Optical smoothness: Surfaces are optically smooth out of the printer (Ra ~15 nm).
• Flexible design freedom: Supports prisms, lenses, textures, and patterns in one process.
• Fast turnaround: Lead times as short as 5–8 business days.
• Cost efficiency: Strong option for prototyping and pre-series illumination optics.

4. Limitations

• Thermal resistance: Limited to ~60–65 °C for LUX Standard, ~90+ °C for LUX Crystalline.
• Material aging: Some resins may yellow over time, especially LUX Standard.
• Impact resistance: Standard resin has moderate strength; crystalline resin is superior.
• Not suitable for ultra-precision imaging optics: Better suited to illumination and functional optics.
• Industrial maturity: Less widespread adoption compared to molding for very high volumes.

5. Materials & Specs

Technical Specifications

• Surface Tolerance: ~10 µm
• Surface Roughness (Ra): ~15 nm
• Surface Roughness (Rz): ~40 µm
• Dimensions: up to 600 × 600 × 6 mm (larger possible)
• Transparency: >90% for λ > 410 nm
• Refractive Index: 1.540 vs. 1.513

LUX Standard Resin

Optimized for fast, cost-effective prototyping with moderate material requirements.

Pros: Ultra-short lead times, large-format capability, cost-efficient.

Cons: Lower temperature resistance (60–65 °C), faster aging (yellowing), limited impact resistance.

Applications: Design validation, rapid testing, temporary installations, marketing / demo optics.

LUX Crystalline Resin

Developed for challenging environments requiring durability and clarity.

Pros: High temperature resistance (90+ °C), strong impact resistance, superior optical quality, high UV stability.

Cons: Higher cost than LUX Standard.

Applications: Automotive headlamps, household appliances, durable transparent parts, advertising goods, design objects.

6. Opdo's Role

At Opdo, Printoptical Technology expands our platform toward large-format illumination optics. We collaborate with customers to develop applications and can deliver parts from initial prototyping through to pre-series production.

This enables:

• Rapid prototyping of illumination optics, diffusers, and textured lenses.
• Scaling to specialized production with short lead times.
• Material matching between LUX Standard for agile design work and LUX Crystalline for durable, production-ready parts.