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US 8,618,466 B2Granted
Position-measuring device having a first measuring standard and at least two multiturn code disks
AssigneeDr. Johannes Heidenhain GmbH
InventorsJoern Ehrenberg, Herman Meyer, Erich Strasser
Life of this patent
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Abstract
A position-measuring device for measuring linear and/or angular positions includes a first measuring standard that has a first code track, with the aid of which consecutive position regions are cyclically measurable, and at least two multiturn code disks having second code tracks, via whose angular positions the currently measured position region of the first code track may be determined. The first measuring standard and the multiturn code disks are positioned such that the first code track and the second code tracks are scannable by a common scanning unit, through a first scanning window and second scanning windows, respectively.
Claims21
A position-measuring device for measuring at least one of (a) linear and (b) angular positions, comprising:
- a first measuring standard including a first code track with which consecutive position regions are cyclically measurable;
- and
- at least two multiturn code disks including second code tracks, a currently measured region of the first code track determinable from angular positions of the multiturn code disks;
- wherein the first measuring standard and the multiturn code disks are positioned such that the first code track and the second code tracks are scannable by a single scanning unit having a single light emitter and a single detector unit, the first code track scannable by the illumination unit and the detector unit of the single scanning unit at a first scanning subregion, and each second code track scannable by the illumination unit and the detector unit of the single scanning unit at a respective second scanning subregion;
- wherein the first measuring standard is arranged as a single-turn code disk connected to a shaft in a rotatably fixed manner, a position region corresponding to a complete revolution of the shaft, a number of completed revolutions of the shaft measurable by the multiturn code disks;
- and
- wherein scanning of the first code track and the second code tracks by the illumination unit and the detector unit is performed inside of an illumination circle produced by the illumination unit.
4 more elements
A position-measuring device for measuring at least one of (a) linear and (b) angular positions, comprising:
- a first measuring standard including a first code track with which consecutive position regions are cyclically measurable;
- and
- at least two multiturn code disks including second code tracks, a currently measured region of the first code track determinable from angular positions of the multiturn code disks;
- wherein the first measuring standard and the multiturn code disks are positioned such that the first code track and the second code tracks are scannable by a common scanning unit having an illumination unit and a detector unit, the first code track scannable by the illumination unit and the detector unit of the common scanning unit at a first scanning subregion, and each second code track scannable by the illumination unit and the detector unit of the common scanning unit at a respective second scanning subregion;
- and
- wherein the first measuring standard is arranged as a ruler connected to a first object, the first code track including code segments that follow each other in a measurement direction, that are encoded in an absolute manner, and that are assigned to position regions, the multiturn code disks and the scanning unit arranged in a scanning head connected to a second object, a number of position regions passed by the scanning head measurable by the multiturn code disks.
3 more elements
A position-measuring device for measuring at least one of (a) linear and (b) angular positions, comprising:
- a first measuring standard including a first code track with which consecutive position regions are cyclically measurable;
- at least two multiturn code disks including second code tracks, a currently measured region of the first code track determinable from angular positions of the multiturn code disks;
- and
- a single scanning unit having a single light emitter and a single detection unit and including a first scanning subregion and second scanning subregions, the first measuring standard and the multiturn code disks positioned such that the first code track is scannable by the illumination unit and the detection unit of the single scanning unit at the first scanning subregion and the second code tracks are scannable by the illumination unit and the detection unit of the single scanning unit at respective second scanning subregions;
- wherein the first measuring standard is arranged as a single-turn code disk connected to a shaft in a rotatably fixed manner, a position region corresponding to a complete revolution of the shaft, a number of completed revolutions of the shaft measurable by the multiturn code disks;
- and
- wherein scanning of the first code track and the second code tracks by the illumination unit and the detector unit is performed inside of an illumination circle produced by the illumination unit.
4 more elements
A position-measuring device for measuring at least one of (a) linear and (b) angular positions, comprising:
- a first measuring standard including a first code track with which consecutive position regions are cyclically measurable;
- at least two multiturn code disks including second code tracks, a currently measured region of the first code track determinable from angular positions of the multiturn code disks;
- and
- a common scanning unit having an illumination unit and a detection unit and including a first scanning subregion and second scanning subregions, the first measuring standard and the multiturn code disks positioned such that the first code track is scannable by the illumination unit and the detection unit of the common scanning unit at the first scanning subregion and the second code tracks are scannable by the illumination unit and the detection unit of the common scanning unit at respective second scanning subregions;
- wherein the first measuring standard is arranged as a ruler connected to a first object, the first code track including code segments that follow each other in a measurement direction, that are encoded in an absolute manner, and that are assigned to position regions, the multiturn code disks and the scanning unit arranged in a scanning head connected to a second object, a number of position regions passed by the scanning head measurable by the multiturn code disks.
2 more elements
Dependencies are inferred from the claim text.