Product type: Flat Lens. Application: Medical, Optical. Model: yt447.
Overview
Polished with Edging N-Bk7 K9 Optical Windows Sheet for Night Vision: an optical glass window made from Optical Glass. Listed geometry: diameter +0.0/-0.15 mm, size 2-300mm. Optical / electrical data: transmittance >95%. Coating: HC; surface quality 60/40, 40/20 or Better; flatness L/4. It is used in Medical and Optical. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.
Specifications
| Material | Optical Glass |
|---|---|
| Type | Flat Lens |
| Dimension | 2-300mm |
| Transmittance | >95% |
| Coating | HC |
| Surface Quality | 60/40, 40/20 or Better |
| Parallelism | ≤5 Arcmin |
| Clear Aperture | > 95% |
| Usage | Medical, Optical |
| Model NO. | yt447 |
| Lenses Color | Clear |
| Diameter Tolerance | +0.0/-0.15 mm |
| Thickness Tolerance | +/-0.1mm |
| Surface Flatness | L/4 |
| Optical window materials comparison | Material |
| Supplier | Changchun Yutai Optics Co., Ltd. |
Technical data
| Material | BK7 other optical glass |
|---|---|
| Dimension | 2-300mm |
| Dimension Tolerance | +0.1, -0.1 mm |
| Thickness Tolerance | +0.1, -0.1 mm |
| Parallelism | ≤5 arcmin |
| Surface Flatness | L/4 |
| Clear Aperture | > 95% |
| Surface Quality | 60-40 scratch and dig |
| Protective Bevel | 0.25 mm x 45° |
| Coating | as customer's requirements |
What to specify when you request a quote
- Material and grade — listed as “Optical Glass”; name the glass or crystal grade (for example JGS1, N-BK7, Borofloat 33, sapphire) because it fixes the transmission band and thermal limits.
- Diameter or outline — listed as “2-300mm”; give the nominal size and the tolerance you can accept.
- Thickness — listed as “+/-0.1mm”; state nominal thickness and tolerance; thinner windows need tighter flatness control.
- Surface quality and flatness — listed as “60/40, 40/20 or Better”; quote scratch-dig and flatness over the clear aperture, not the whole part.
- Coating — listed as “HC”; list the wavelength band and the maximum reflectance per surface for any AR coating.
- Clear aperture and edges — listed as “> 95%”; define the usable aperture and the edge chamfer.
Engineering guides for this part
For material grades and coating options, see Custom Borosilicate Glass Sheets Cut to Size: Precision and Performance. How parts like this are machined and finished is covered in Flat Glass Polishing Process for Precision Substrates. For an application example, read Bulk Ordering Glass Windows for Robotic Vacuum Optical Sensors. Before sending a drawing, check Specifying Coatings for Custom Glass Windows and Substrates. A related standard product is Infrared Windows.
