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US 5,856,668 AGranted
Photoelectric position measuring encoder having scale formed of electrically non-conductive material
AssigneeJohannes Heidenhain GmbH
InventorsGunther Nelle, Peter Fernsebner
Life of this patent
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Abstract
A photoelectric position measuring encoder including a scale formed of an electrically non-conductive material and having a graduation, a scanner for photoelectrically scanning the graduation and displaceable relative to the scale in a measuring direction for generating a position-dependent signal, a slide or roller element for supporting the scanner on a scale surface, and an electrically conductive element with which the scanner-supporting scale surface region forms an electrical contact and which is connected to a reference potential.
Claims10
A photoelectric position measuring encoder, comprising:
- a scale formed of an electrically non-conductive material and having a graduation;
- a support member to which the scale is secured;
- a scanner for photoelectrically scanning the graduation and displaceable relative to the scale in a measuring direction for generating a position-dependent signal;
- one of a slide and roller element for supporting the scanner on a scale surface region;
- electrically conductive means with which the scanner-supporting scale surface region forms an electrical contact;
- and
- an electrically conductive connection element for connecting the electrically conductive means with a reference potential.
4 more elements
Dependencies are inferred from the claim text.