Glass Encoder Disc
High-precision transmissive glass-substrate encoder discs made by photolithographic patterning, for high-resolution optical encoders.
Glass encoder discs use optical glass as the substrate, with high-precision graduation patterns formed on the surface by photolithographic patterning; they are transmissive discs. Light passing through the transparent and opaque areas of the disc is received by photodetectors and converted into position signals. With good thermal stability and high graduation accuracy, glass is the mainstream choice for medium- to high-resolution optical encoders.
Features
- Optical glass substrate with low thermal expansion and high dimensional stability
- Photolithographic graduations with uniform pitch, sharp edges and high contrast
- Suitable for high-resolution incremental and absolute encoding
- Customizable outer diameter, bore and line count
Specifications and Custom Options
| Item | Description |
|---|---|
| Substrate | Optical glass |
| Optical path | Transmissive |
| Encoding type | Incremental / absolute |
| Patterning process | Cr coating + photolithography + etching |
| Contour machining | Laser cutting of outer diameter, laser machining of bore |
| Inspection | AOI machine vision inspection of every disc; vision measurement; optical density testing |
| Capacity | About 30,000 discs per day (all product lines combined) |
| Customizable | Outer diameter, bore, thickness, line count, track pattern, coating |
| Example | Transmissive glass encoder disc, 2000 P/R |
Specific values such as outer diameter, line count and line width accuracy are evaluated against your drawing; contact an engineer for a specification sheet and quotation.
Typical Applications
Servo motor encoders, CNC machine tool position feedback, optical metrology instruments, precision motion control systems.