Micro Precision Glass Drum Lens Customizable Different Sizes

The Drum Lens is an advanced optical element optimized from conventional spherical lenses. Its drum-shaped structure is formed by axial grinding of the outer circumference. Both ends retain spherical surfaces to ensure optical performance, while the central drum surface provides a stable mechanical reference for precise mounting. These lenses are ideal for optical communication, biological microscopy, laser processing, and other high-precision optical systems. They address common challenges of traditional optics, such as difficult mounting and limited positioning accuracy.

Features

Drum Structure: Built-in positioning surface simplifies mounting and optical alignment.
Glass Substrate: Wide spectral transmittance (350–2200 nm), temperature resistant, anti-aging.
High-Precision Performance: Surface quality up to 40-20; surface figure accuracy up to λ/10.
Dual Type Adaptation: Type A for general transmission; Type B allows direct fiber contact.
Customizable: Diameter ranges from 3 mm to 500 mm, with parameters adjustable on demand.

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Detailed Feature Analysis

Practical Value of Drum Structure:

Conventional spherical lenses lack fixed positioning surfaces, requiring repeated alignment during mounting. The central drum surface of our lens acts as a mechanical reference, eliminating the need for auxiliary clamps. This improves assembly efficiency by approximately 40%, especially in industrial applications such as laser marking systems.

Material Adaptability:

N-BK7/K9 Glass (Standard): ≥90% transmittance from 350–2200 nm. Ideal for biological microscopes, security cameras, and similar applications.
UV Fused Silica (Custom): Covers 185–2500 nm, suitable for UV lithography, water quality monitoring, and other wavelength-sensitive applications—temperature tolerance: -40°C to 120°C, ensuring stability in industrial environments.

Significance of High-Precision Parameters:

Surface quality 40-20: Maximum scratch width ≤40 μm, dig diameter ≤20 μm per square inch, reducing scattering loss.
Surface figure accuracy λ/10 (λ≈550 nm): Deviation from ideal curve ≈55 nm, preventing imaging blur. Suitable for laser cutting, fiber communications, and high-precision optical applications.

Dual-Type Design:

Type A (Full Drum): No flat surfaces, ideal for 360° light transmission modules. Post-mounting axis deviation ≤0.05°.
Type B (Polished Flat End): Flat end allows direct fiber contact, reducing air gaps. Signal loss can be reduced below 0.5%, improving transmission distance by approximately 15% in typical setups.

Product Advantages

Efficient Assembly: Drum surface eliminates auxiliary clamps. Adjustment time per lens drops from 5 to 3 minutes.
Stable Performance: Glass offers three times better aging resistance than resin lenses. Transmittance degradation ≤3% over 5 years.
Flexible Adaptation: Customizable diameter, curvature radius, and thickness. Minimum diameter 3 mm for micro-sensors; maximum 500 mm for large laser systems.
Cost-Effective: Standard models (e.g., 2.4 mm) are in stock, with 3–4 business days delivery. Custom models available in small batches (starting from 10 pieces).

Usage Tips & FAQ

Usage Tips:

Mounting & Alignment: Use the drum surface for fixture contact; calibrate the optical axis with a micrometer. Ordinary scenarios: axis deviation ≤0.05°; high-precision laser applications: ≤0.008°.
Cleaning & Maintenance: Wipe along lens curvature with a lint-free cloth moistened with anhydrous ethanol or specialized optical cleaner. Avoid direct contact with fingers.
Storage & Protection: Store in sealed boxes with silica gel (replace monthly) or industrial dehumidifiers (humidity 30–40%) to prevent moisture and mold.
Coating Selection: Use 1000–1065 nm AR coatings for optical communication; 400–700 nm broadband AR coatings for biological imaging, reducing reflection loss ≤0.5%.

FAQ:

Q: How to choose between a Drum Lens and a conventional spherical lens?
A: Drum Lenses are ideal for frequent mounting or batch assembly. For fixed optical paths with low assembly demands, conventional lenses are more cost-effective.

Q: What information is needed to customize a Drum Lens?
A: Provide 1) Application, 2) Critical dimensions (diameter, length), 3) Special requirements (e.g., UV, AR coating). We assist with the remaining parameters.

Q: Can surface scratches affect performance?
A: Visible scratches >0.5 μm can increase reflection loss (up to 5%) and require replacement. Minor dirt can be cleaned without affecting performance.

Q: How does delivery differ between standard and custom models?
A: Standard models ship in 3–4 business days. Custom models: standard precision 7–10 days; high precision 15–20 days. Rush orders can be arranged.

Detailed Specifications

Category	Parameter Range	Standard Configuration	High-Precision Custom
Substrate Material	N-BK7/K9 Optical Glass, UV Fused Silica	N-BK7	Customizable
Diameter	3–500 mm	2.4 mm / 4 mm	Customizable
Length / Thickness	Customizable	3.0 mm (2.4 mm dia.)	±0.01 mm
Curvature Radius	±1 mm – ±50000 mm	1.50 mm	±1%
Tolerance Accuracy	Diameter ±0.01–0.1 mm; Length ±0.05 mm	Diameter ±0.05 mm; Length ±3 μm	Diameter ±0.01 mm; Length ±1 μm
Surface Quality	10-5 to 60/40	40-20	10-5
Surface Figure Accuracy	λ/10 to λ/2	λ/8	λ/10
Transmission Wavelength	350–2200 nm (N-BK7); 185–2500 nm (Silica)	350–2200 nm	Customizable
AR Coating Options	400–700 / 650–1100 / 1000–1065 nm	None	Multi-layer AR coating