D-Shaped Glass Capillary Tubes
D-Shaped Glass Capillary Tubes
BYNET D-shaped glass capillary tubes are designed for optical fiber positioning, bonding, and precision micro-optical assembly. Featuring a D-shaped outer profile with a flat reference surface, these capillaries help control rotational orientation when used with compatible mounting structures.
The reference configurations feature a single axial bore for fiber insertion and positioning. Different outer sizes are available to meet specific optical assembly requirements.
D-Shaped Glass Capillary Tubes
Precision Glass Capillaries for Optical Fiber Alignment and Positioning
BYNET D-shaped glass capillary tubes are designed for optical fiber positioning, bonding, and precision micro-optical assembly. Featuring a D-shaped outer profile with a flat reference surface, these capillaries help control rotational orientation when used with compatible mounting structures.
The reference configurations feature a single axial bore for fiber insertion and positioning. Different outer sizes are available to meet specific optical assembly requirements.
Product Overview
D-shaped glass capillaries combine the fiber-positioning function of a precision glass capillary with the mechanical reference surface provided by a flat-sided outer profile.
Compared with conventional round capillaries, the flat surface offers an additional orientation reference during installation. When properly matched with an assembly fixture or mounting structure, it can help maintain a defined rotational position.
These capillaries can be incorporated into fiber pigtail assemblies, optical fiber bonding structures, and compatible micro-optical packages.
Key Features
- D-Shaped Outer Profile: The flat external surface provides a mechanical reference for rotational positioning during assembly.
- Single-Bore Configuration: A defined axial bore supports optical fiber insertion and positioning.
- Reference Dimensions: Available configurations include specified outer dimensions, bore diameters, and length tolerances.
- Assembly Integration: Suitable for applications requiring fiber positioning and a defined external mounting orientation.
- Drawing-Based Customization: Specific dimensions, bore positions, lengths, and end-face requirements can be reviewed against customer drawings.
Technical Specifications
The following reference dimensions are based on existing BYNET product information.
| Parameter | Specification 1 | Specification 2 |
|---|---|---|
| Outer Profile | D-Shaped | D-Shaped |
| Nominal Outer Size | 1.6 × 1.6 mm | 2.5 × 2.5 mm |
| Inner Bore Diameter (ID) | 0.127 ± 0.002 mm | 0.127 ± 0.002 mm |
| Length | Customer-defined L | Customer-defined L |
| Length Tolerance | ±0.2 mm | ±0.2 mm |
| Bore Configuration | Single Bore* | Single Bore* |
The nominal outer sizes are reproduced from the existing specifications. The width, height, flat position, bore configuration, and bore-to-flat distance must be confirmed against the technical drawing before final specification approval.
All dimensions are subject to engineering confirmation.
Applications
Optical Fiber Positioning and Bonding
D-shaped glass capillaries can be used to position and support optical fibers during adhesive bonding and precision assembly. The external flat surface provides an additional reference for controlling component orientation.
Fiber Pigtail Assemblies
The capillaries can serve as fiber-positioning components in compatible pigtail structures requiring defined mechanical orientation.
Fiber Collimator and Micro-Optical Assembly
Selected configurations may be incorporated into fiber collimator assemblies and other micro-optical packages where fiber placement and mechanical alignment are important.
Fiber Sensor Packaging
The D-shaped outer profile can be considered for optical fiber sensor assemblies requiring a defined mounting orientation or fiber position.
Precision Optical Fixtures
The flat-sided geometry may be used in custom alignment fixtures and supporting structures designed for optical fiber components.
D-Shaped Profile and Bore Selection
Selecting a D-shaped glass capillary requires consideration of both the internal bore and the external positioning geometry.
Flat-Surface Positioning
The flat surface can act as a reference face when the capillary is installed in a compatible fixture. Its effectiveness depends on the mounting geometry, dimensional tolerances, and assembly clearance.
Bore Diameter
The inner bore should be selected according to the actual fiber cladding diameter, dimensional tolerances, and required insertion or bonding clearance.
For optical fibers with a nominal 125 μm cladding diameter, the suitability of a 0.127 mm bore must be evaluated against the fiber’s actual dimensions and the specified bore tolerance.
Bore-to-Flat Position
For applications requiring controlled fiber placement relative to the external flat, the bore-to-flat distance and its tolerance should be defined in the technical drawing.
Customization and Technical Support
BYNET can review custom D-shaped glass capillary requirements based on customer drawings and application details.
Please provide:
- Required outer dimensions and D-shaped profile
- Inner bore diameter and dimensional tolerance
- Bore position and bore-to-flat distance
- Required length and length tolerance
- Flatness and end-face requirements, where applicable
- Glass material requirements
- Fiber dimensions and intended application
- Technical drawing and estimated order quantity
Manufacturing feasibility and final specifications are subject to engineering confirmation.
Frequently Asked Questions
Q1: What is a D-shaped glass capillary used for?
A D-shaped glass capillary is used to position and support optical fibers in precision assemblies. Its flat external surface can provide an additional mechanical reference for controlling rotational orientation.
Q2: What is the difference between a D-shaped and a round glass capillary?
A round capillary has a circular external profile, while a D-shaped capillary includes a flat side. The flat surface provides an orientation reference when used with a compatible mounting structure.
Q3: Is a 0.127 mm bore suitable for a 125 μm optical fiber?
It may be suitable for certain bare-fiber assemblies. However, compatibility depends on the actual fiber cladding diameter, bore tolerances, and the clearance required by the assembly process.
Q4: What is the bore-to-flat distance?
The bore-to-flat distance is the specified distance between the bore center and the external flat reference surface. It is important when the fiber position must be controlled relative to the mounting surface.
Q5: Can D-shaped glass capillaries be customized?
BYNET can review requests for custom outer profiles, bore diameters, bore positions, lengths, and dimensional tolerances based on customer drawings. Final feasibility must be confirmed.
Request a Quote
Looking for D-shaped glass capillary tubes for your fiber optic or micro-optical assembly?
Send BYNET your required outer dimensions, bore diameter, bore-to-flat distance, length, technical drawing, and estimated quantity. Our team can review your requirements and discuss suitable specifications.
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