Reticles
Material
| Substrate material | selected float glass, BK7 optical glass, quartz glass, ceramics, borosilicate, aluminium oxide and others. |
| Thickness of substrate | 0,5 - 8 mm |
|
Coating - optical density - reflection - layer thickness |
vacuum deposited chrome 1.5 - 3 (±5%) at 400-900 nm < 63% at 400-900 nm 200÷2000 Å |
|
Shape of reticle |
plate, disc |
|
Reticle processing |
scribed and broken, laser cutting, grinding |
| Outbreaks on edges | < 0.1 mm |
| Grinded, polished glass | edges linearity 0.015 mm/m |
Pattern
| Coating | Aluminum, silica, chrome, anti-reflective chrome and others on request |
| Graduation line's width max. tolerance | 10% |
| Max. graduation accuracy | 2 arc. sec |
| Graduation coaxiality to outside diameter | < 0.1 mm (DIN7184) |
