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Heidenhain - Exposed Linear Encoder

Exposed linear encoders are designed for use on machines and installations that require especially high accuracy of the measured value.

Typical applications include:

  • Measuring and production equipment in the semiconductor industry
  • PCB assembly machines
  • Ultra-precision machines
  • High-accuracy machine tools
  • Measuring machines and comparators, measuring microscopes, and other precision measuring devices
  • Direct drives

Absolute encoders



LIC The LIC exposed linear encoders permit absolute position measurement both over large paths of traverse up to 27 m and at high traversing speed. In their dimensions and mounting, they match the LIDA 400.

Encoders with position value output

 Series  Description
 LIP 200 The LIP 211 and LIP 291 incremental linear encoders output the position information as a position value. The sinusoidal scanning signals are highly interpolated in the scanning head and converted to a position value by the integrated counter function. As with all incremental encoders, the absolute reference is established with the aid of reference marks.

Incremental Encoders




For very high accuracy
The LIP exposed linear encoders are characterized by very small measuring steps together with very high accuracy and repeatability. They operate according to the interferential scanning principle and feature a DIADUR phase grating as the measuring standard.


For high accuracy
The LIF exposed linear encoders have a measuring standard manufactured in the SUPRADUR process on a glass substrate and operate on the interferential scanning principle. They feature high accuracy and repeatability, are especially easy to mount, and have limit switches and homing tracks. The special version LIF 481 V can be used in high vacuum up to 10–7 bar

LIDA For high traversing speeds and large measuring lengths
The LIDA exposed linear encoders are specially designed for high traversing speeds up to 10 m/s, and are particularly easy to mount with various mounting possibilities. Steel scale tapes, glass or glass ceramic are used as carriers for METALLUR graduations, depending on the respective encoder. They also feature a limit switch.  

For two-coordinate measurement
On the PP two-coordinate encoder, a planar phase-grating structure manufactured with the DIADUR process serves as the measuring standard, which is scanned interferentially. This makes it possible to measure positions in a plane.


For application in high and ultrahigh vacuum technology
Our standard encoders are suitable for use in a low or medium vacuum. Encoders used for applications in a high or ultrahigh vacuum need to fulfill special requirements. Design and materials used have to be specially adapted for it. For more information, refer to the Technical Information document Linear Encoders for Vacuum Technology.
The following exposed linear encoders are specially adapted for use in high and ultrahigh vacuum environments.
• High vacuum: LIP 481 V and LIF 481 V

• High vacuum: LIC 4113 V and LIC 4193 V

• Ultrahigh vacuum: LIP 481 U

 Exposed Linear Encoders

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Heidenhain - Exposed Linear Encoders