Rotary encoders and angle sensors

High-resolution optical rotary encoders with plastic diffractive encoder disk

Miniaturized absolute rotary encoders

Our rotary encoders use an injected-molded encoding disk of plastic instead of an encoding disk of glass. In this regard we fall back on the manufacturing processes of CD production; Optical phase lattice structures in the sub-micrometer range are produced on the encoder disk.

Rotary encoders detect the angular position in rotational movements and are used in great variety of industrial applications, for example, they are used in motor vehicles, to detect the steering angle, or in machine tools to determine the position of rotating elements. Most state-of-the-art, high-resolution optical rotary encoders use cost-intensive encoding disks made of glass, and require complex adjustment at installation. Through the suitable design of the illuminating, i.e. read-out, optics, our rotary encoders can be installed without complex adjustment. The innovative rotary encoder concept enables development of incremental, as well as absolute coded systems. For example, in a project subsidized by AiF, together with the Institute for Technical Optics (ITO) at the University of Stuttgart, an incrementally coded optical rotary encoder was developed and characterized, and an innovative coding concept for an absolutely coded rotary encoder was introduced.

Our incremental rotary encoders supply signals with extremely low harmonic distortion, so that high interpolation rates with a resolution of at least 19 bits are possible.


Dr. Jonathan Seybold
Phone: +49 711 685-84771