Product type: Glass Dome. Application: Lighting, Medical, Optical, Photography, Astronomy.
Overview
Fine ground optical blanks hemisphere dome lens: an optical lens made from Schott N-Bk7. Listed geometry: diameter 140.0+/-0.1mm, thickness 15.0+/-0.1mm, ball, hemisphere shape. Optical / electrical data: transmittance 90%-95%. Supplied uncoated. Listed for Lighting, Medical, Optical, Photography and Astronomy applications. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.
Specifications
| Material | Schott N-Bk7 |
|---|---|
| Type | Glass Dome |
| Shape | Ball, Hemisphere |
| Diameter | 140.0+/-0.1mm |
| Thickness | 15.0+/-0.1mm |
| Transmittance | 90%-95% |
| Coating | Uncoated |
| Clear aperture | >90% |
| Usage | Lighting, Medical, Optical, Photography, Astronomy |
| Lenses Color | Clear |
| Specifications | Items |
| R1 | 85mm CX |
| R2 | 70mm CC |
| Chamfer | protected |
| Standard | MIL-PRF-13830B |
| Supplier | CPG OPTICS LIMITED |
Technical data
| Items | Description | |
| Glass Dome | Material: | Schott N-BK7 |
| Diameter: | 140.0+/-0.1mm | |
| Thickness: | 15.0+/-0.1mm | |
| R1: | 85mm CX | |
| R2: | 70mm CC | |
| Flatness: | N/A | |
| Surface quality: | N/A | |
| Centerness: | N/A | |
| Clear aperture: | >90% | |
| Chamfer: | protected | |
| Coating: | uncoated | |
| Standard: | MIL-PRF-13830B |
What to specify when you request a quote
- Material — listed as “Schott N-Bk7”; name the glass or crystal.
- Geometry — listed as “140.0+/-0.1mm”; give diameter, focal length or radii, angles and tolerances.
- Surface figure — quote surface figure (λ) and scratch-dig.
- Centring and edges — listed as “protected”; state centration and edge chamfer.
- Coating — listed as “Uncoated”; list the band and reflectance or transmission target.
Engineering guides for this part
For material grades and coating options, see Selecting Fused Silica and Quartz Glass for Precision Components. How parts like this are machined and finished is covered in Flat Glass Polishing Process for Precision Substrates. For an application example, read Fused Silica Glass Wafers for Precision Appliance Electronics. Before sending a drawing, check Fused Silica Refractive Index: Key to Optical Design Improvement. A related standard product is Fused Silica Glass Wafers (2–12", JGS1/JGS2).
