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We typically achieve pitch accuracies better than 0.2μm and feature size tolerances within ±5% of the design specification.

Quartz substrates are recommended for high-temperature or extreme thermal cycling applications due to their low coefficient of expansion.

Yes, all our precision calibration plates and scales can be provided with certificates traceable to international standards (METAS/NIST).

We specialize in both high-volume production and small-batch prototyping to support R&D phases of product development.

An optical encoder disc is the core optical element of a rotary encoder system, responsible for converting mechanical rotation into a high-resolution electrical signal.

An optical rotary encoder works by reading a precision graduation pattern on a rotating disc to produce a continuous electrical signal proportional to angular position or velocity.

Optical rotary encoders are used across virtually every industry where controlled or measured rotational motion is involved: industrial automation, robotics, aerospace, medical devices, and so on.

Sodalime glass is the standard substrate for the majority of industrial and instrumentation encoder discs, offering a well-controlled thermal expansion coefficient of approximately 9 ppm/°C.

Selba’s rotary encoder discs are produced using high-resolution laser photoplotting at up to 50,800 dpi, enabling fine-pitch graduation patterns with consistent line widths, sharp edge definition, and micron-level positional accuracy across the full disc circumference.