Position measurement device

By optimizing the design of the scale support and scanning structure assembly, the problem of large structural space requirements in existing position measurement devices has been solved, realizing compact and accurate position measurement of multi-degree-of-freedom objects.

CN122107895APending Publication Date: 2026-05-29DR JOHANNES HEIDENHAIN GMBH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DR JOHANNES HEIDENHAIN GMBH
Filing Date
2025-11-18
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing position measurement devices require a large amount of structural space when detecting the relative position of two objects that can move relative to each other, which makes it impossible to obtain sufficient space in some applications.

Method used

A position measuring device was designed, which adopts a scale support with multiple measuring scales and a movable scanning structure assembly. By optimizing the plane intersection angle and the arrangement of scanning units, a compact structural design is achieved, and accurate measurements are performed in six degrees of freedom of motion.

Benefits of technology

It achieves precise position measurement in multiple degrees of freedom of motion, reduces the overall size requirement of the device, and ensures high sensitivity and flexible application adaptability.

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Abstract

The invention relates to a position measuring device for detecting the relative position of two objects, which can be moved relative to each other along a translational main movement direction and in further degrees of freedom. A scale carrier, which extends longitudinally along the main movement direction, has a first, a second and a third surface, by which surfaces a plane is respectively defined and in each of which at least one measurement scale is respectively arranged. A scanning structure assembly, which is movable relative to the scale carrier, comprises a plurality of scanning units, which are configured for generating a movement-dependent position signal from a scan of the measurement scales, wherein at least one scanning unit is assigned to each surface. The plane defined by the second surface divides the surrounding space into two half-spaces, wherein the first surface with at least one measurement scale is arranged in one of the half-spaces and the third surface with at least one measurement scale is arranged in the other half-space.
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Citation Information

Patent Citations

  • Displacement measuring apparatus and method

    EP0163362A1

  • Error compensation for coordinate measuring machines using a reference module

    WO2017080612A1