An annular design example for discussing ring geometry and track placement.
Annular-Pattern Glass Encoder Disc
An alternative TLoptik patterned-glass design for a custom encoder-disc specification.
One family.
A different pattern.
An annular glass disc leaves central clearance for the shaft and mounting assembly. Track radius, graduation pitch and index position are matched to the readhead geometry.
- Product family
- Optical encoder discs
- Pattern layout
- Annular code track
- Photolithographic line-width tolerance
- ±0.2 µm
- Mechanical cutting accuracy
- ±0.02 mm
- Dimensions & material
- Confirm against the project drawing
- Availability
- Custom inquiry
Related resources
Choose by function
What it is and what it does
The patterned glass is the physical position reference in an optical encoder. A compatible readhead illuminates the pattern and converts changes in light into signals for a controller.
When to choose it
Use a disc for rotary motion and a scale for linear travel. Then choose whether the instrument can establish a reference at startup or must identify its position directly from the code.
How it differs from related products
Transmission versus reflection defines the optical path; incremental versus absolute defines the position code. These are separate choices: first check readhead access, then decide how the machine should recover its position.
What can be customised
Track geometry, periods or code layout, reference marks, active reading area, mounting datums and substrate outline can be adapted together. Optical contrast is matched to the illumination and readhead arrangement.
What you receive
A patterned encoder disc or linear scale with the agreed track layout, mounting dimensions and component inspection records.
Where this product is used
Annular-pattern example for rotary rings and central-clearance layouts.
Selection notes
An annular-pattern glass encoder disc places angle-sensing tracks around a central mounting opening.
Specify the bore, reading radius and mounting relationship together. Keep the index direction consistent with the artwork sequence.
Information for your inquiry
Outer diameter, bore, ring width, thickness, reading radius, graduations and index marks.
Why are bore diameter and reading radius both needed?
The bore defines the mechanical opening; the reading radius defines where the optical head reads the track. They describe different interfaces.