Patent US4606030A successfully refreshed from Google Patents.
Patent US5386642A successfully refreshed from Google Patents.
US5386642A
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Position measuring instrument
Assignee: Dr Johannes Heidenhain GmbH
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Filing: 1993-02-04
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Granted: 1995-02-07
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Expires: 2013-02-04
Abstract
Abstract A position measuring instrument for measuring the relative position of two objects movable relative to one another. The position measuring instrument comprises a periodic measurement scale division having a period t and a scanner unit, wherein the scanner unit and the periodic measurement scale division move relative to one another in a measuring direction. In addition, the scanner unit comprises four groups (A-D) each comprising at least four magnetoresistive elements (A n -D n ) (n=1, 2, 3, 4, . . .), which are interconnected in the form of a series-parallel circuit to form a half bridge circuit having an upper branch and a lower branch. The upper branch comprises a magnetoresistive element from each group (A-D) and the lower branch comprises a corresponding magnetoresistive element from each group (A-D). Furthermore, the magnetoresistive elements of the upper branch are offset from the corresponding magnetoresistive elements of the lower branch by t/2. The position measurement instrument further comprises an evaluation device to form position measurement values from position-dependent output signals generated by the magnetoresistive elements in response to relative movement between the periodic measurement scale division and the scanner unit.
Inventors
- 👤 Alfons Spies
- 👤 Gerald Metz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:25
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/142; G01D5/145; G01P; G01P13/00; G01P13/02; G01P13/04
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
217 words
A position measuring instrument for measuring the relative position of a first object and a second object movable relative to one another, comprising: a periodic measurement scale division having a period t and secured to said first object; a scanner unit secured to said second object, wherein said scanner unit and said periodic measurement scale division move relative to one another in a measuring direction; said scanner unit comprising four groups (A-D) each comprising at least four magnetoresistive elements (A n -D n ) (n=1, 2, 3, 4, . . .), wherein said at least four magnetoresistive elements (A n -D n ) (n=1, 2, 3, 4, . . .) of each of said four groups (A-D) are interconnected in the form of series-parallel circuits to form two half bridge circuits having an upper branch and a lower branch; wherein said upper branch comprises a magnetoresistive element from each group (A-D) and said lower branch comprises a corresponding magnetoresistive element from each group (A-D); said magnetoresistive elements of said upper branch are offset from the corresponding magnetoresistive elements of said lower branch by t/2; and an evaluation device to form position measurement values from position-dependent output signals generated by said magnetoresistive elements in response to relative movement between said periodic measurement scale division and said scanner unit.
Claim 2
Dependent Claim
217 words
A position measuring instrument for measuring the relative position of a first object and a second object movable relative to one another, comprising: a periodic measurement scale division having a period t and secured to said first object; a scanner unit secured to said second object, wherein said scanner unit and said periodic measurement scale division move relative to one another in a measuring direction; said scanner unit comprising four groups (A-D) each comprising at least four magnetoresistive elements (A n -D n ) (n=1, 2, 3, 4, . . .), wherein said at least four magnetoresistive elements (A n -D n ) (n=1, 2, 3, 4, . . .) of each of said four groups (A-D) are interconnected in the form of series-parallel circuits to form two half bridge circuits having an upper branch and a lower branch; wherein said upper branch comprises a magnetoresistive element from each group (A-D) and said lower branch comprises a corresponding magnetoresistive element from each group (A-D); said magnetoresistive elements of said upper branch are offset from the corresponding magnetoresistive elements of said lower branch by t/2; and an evaluation device to form position measurement values from position-dependent output signals generated by said magnetoresistive elements in response to relative movement between said periodic measurement scale division and said scanner unit.
Claim 3
Dependent Claim
22 words
The position measuring instrument of claim 1, wherein each group (A-D) extends over a period t of said periodic measurement scale division.
Claim 4
Dependent Claim
35 words
The position measuring instrument of claim 1, wherein when there are m (m=4, 5, . . .) total magnetoresistive elements (A n -D n ) of each group (A-D), their respective mutual spacing is t/m.
Claim 5
Dependent Claim
29 words
The position measuring instrument of claim 1, wherein when there are four magnetoresistive elements (A n -D n ) of each group (A-D), their respective mutual spacing is t/4.
Claim 6
Dependent Claim
27 words
The position measuring instrument of claim 1, wherein said half bridge circuit comprises a quarter bridge having at least four magnetoresistive elements interconnected arbitrarily among one another.
Claim 7
Dependent Claim
24 words
The position measuring instrument of claim 1, wherein said periodic measurement scale division comprises magnetized regions of alternatingly opposite polarity in said measuring direction.
Claim 8
Dependent Claim
27 words
The position measuring instrument of claim 1, wherein said periodic measurement scale division comprises alternating regions of good magnetic conductivity and poor magnetic-conductivity in said measuring direction.
Claim 9
Dependent Claim
15 words
The position measuring instrument of claim 7, wherein said scanner unit comprises a permanent magnet.
Claim 10
Dependent Claim
23 words
The position measuring instrument of claim 7, wherein said periodic measurement scale division comprises alternatingly successive lands and indentations in said measuring direction.
Claim 11
Dependent Claim
14 words
The measuring instrument of claim 1, wherein said evaluation device has an interpolation unit.
Claim 12
Dependent Claim
209 words
A position measuring instrument for measuring the relative position of a first object and a second object movable relative to one another, comprising: a periodic measurement scale division having a period t and secured to said first object; a scanner unit, wherein said scanner unit and said periodic measurement scale division move relative to one another in a measuring direction; said scanner unit comprising eight groups (A-H) each comprising at least four magnetoresistive elements (An-Hn) (n=1, 2, 3, 4, . . .), wherein said at least four magnetoresistive elements (A n -H n ) (n=1, 2, 3, 4, . . .) of each of said eight groups (A-H) are interconnected in the form of a series-parallel circuit to form a full bridge circuit having a left-hand branch and a right-hand branch; wherein said left-hand branch comprises a magneto-resistive element from each group (A-H) and said right-hand branch comprises a corresponding magnetoresistive element from each group (A-H); said magnetoresistive elements of said left-hand branch are offset from the corresponding magnetoresistive elements of said right-hand branch by t/2; and an evaluation device to form position measurement values from position-dependent output signals generated by said magnetoresistive elements in response to relative movement between said periodic measurement scale division and said scanner unit.
Claim 13
Dependent Claim
209 words
A position measuring instrument for measuring the relative position of a first object and a second object movable relative to one another, comprising: a periodic measurement scale division having a period t and secured to said first object; a scanner unit, wherein said scanner unit and said periodic measurement scale division move relative to one another in a measuring direction; said scanner unit comprising eight groups (A-H) each comprising at least four magnetoresistive elements (An-Hn) (n=1, 2, 3, 4, . . .), wherein said at least four magnetoresistive elements (A n -H n ) (n=1, 2, 3, 4, . . .) of each of said eight groups (A-H) are interconnected in the form of a series-parallel circuit to form a full bridge circuit having a left-hand branch and a right-hand branch; wherein said left-hand branch comprises a magneto-resistive element from each group (A-H) and said right-hand branch comprises a corresponding magnetoresistive element from each group (A-H); said magnetoresistive elements of said left-hand branch are offset from the corresponding magnetoresistive elements of said right-hand branch by t/2; and an evaluation device to form position measurement values from position-dependent output signals generated by said magnetoresistive elements in response to relative movement between said periodic measurement scale division and said scanner unit.
Claim 14
Dependent Claim
22 words
The position measuring instrument of claim 11, wherein each group (A-H) extends over a period t of said periodic measurement scale division.
Claim 15
Dependent Claim
35 words
The position measuring instrument of claim 11, wherein when there are m (m=4, 5, . . .) total magnetoresistive elements (A n -H n ) of each group (A-H), their respective mutual spacing is t/m.
Claim 16
Dependent Claim
29 words
The position measuring instrument of claim 11, wherein when there are four magnetoresistive elements (A n -D n ) of each group (A-D), their respective mutual spacing is t/4.
Claim 17
Dependent Claim
27 words
The position measuring instrument of claim 11, wherein said full bridge circuit comprises a quarter bridge having at least four magnetoresistive elements interconnected arbitrarily among one another.
Claim 18
Dependent Claim
24 words
The position measuring instrument of claim 11, wherein said periodic measurement scale division comprises magnetized regions of alternatingly opposite polarity in said measuring direction.
Claim 19
Dependent Claim
28 words
The position measuring instrument of claim 11, wherein said periodic measurement scale division comprises alternating regions of good magnetic conductivity and poor magnetic conductivity in said measuring direction.
Claim 20
Dependent Claim
15 words
The position measuring instrument of claim 17, wherein said scanner unit comprises a permanent magnet.
Claim 21
Dependent Claim
23 words
The position measuring instrument of claim 17, wherein said periodic measurement scale division comprises alternatingly successive lands and indentations in said measuring direction.
Claim 22
Dependent Claim
14 words
The measuring instrument of claim 11, wherein said evaluation device has an interpolation unit.
Claim 23
Dependent Claim
218 words
A position measuring instrument for measuring the relative position of a first object and a second object movable relative to one another, comprising: a periodic measurement scale division having a period t and secured to said first object; a scanner unit secured to said second object, wherein said scanner unit and said periodic measurement scale division move relative to one another in a measuring direction; said scanner unit comprising eight groups (A-H) each comprising at least four magnetoresistive elements (A n -H n ) (n=1, 2, 3, 4, . . .), wherein said at least four magnetoresistive elements (A n -H n ) (n=1, 2, 3, 4, . . .) of each of said four groups (A-H) are interconnected in the form of a series-parallel circuit to form a full bridge circuit having an upper branch and a lower branch; wherein said upper branch comprises a magnetoresistive element from each group (A-H) and said lower branch comprises a corresponding magnetoresistive element from each group (A-H); said magnetoresistive elements of said upper branch are offset from the corresponding magnetoresistive elements of said lower branch by t/2; and an evaluation device to form position measurement values from position-dependent output signals generated by said magnetoresistive elements in response to relative movement between said periodic measurement scale division and said scanner unit.
Claim 24
Dependent Claim
218 words
A position measuring instrument for measuring the relative position of a first object and a second object movable relative to one another, comprising: a periodic measurement scale division having a period t and secured to said first object; a scanner unit secured to said second object, wherein said scanner unit and said periodic measurement scale division move relative to one another in a measuring direction; said scanner unit comprising eight groups (A-H) each comprising at least four magnetoresistive elements (A n -H n ) (n=1, 2, 3, 4, . . .), wherein said at least four magnetoresistive elements (A n -H n ) (n=1, 2, 3, 4, . . .) of each of said four groups (A-H) are interconnected in the form of a series-parallel circuit to form a full bridge circuit having an upper branch and a lower branch; wherein said upper branch comprises a magnetoresistive element from each group (A-H) and said lower branch comprises a corresponding magnetoresistive element from each group (A-H); said magnetoresistive elements of said upper branch are offset from the corresponding magnetoresistive elements of said lower branch by t/2; and an evaluation device to form position measurement values from position-dependent output signals generated by said magnetoresistive elements in response to relative movement between said periodic measurement scale division and said scanner unit.
Claim 25
Dependent Claim
22 words
The position measuring instrument of claim 21, wherein each group (A-H) extends over a period t of said periodic measurement scale division.
Claim 26
Dependent Claim
35 words
The position measuring instrument of claim 21, wherein when there are m (m=4, 5, . . .) total magnetoresistive elements (A n -H n ) of each group (A-H), their respective mutual spacing is t/m.
Claim 27
Dependent Claim
29 words
The position measuring instrument of claim 21, wherein when there are four magnetoresistive elements (A n -H n ) of each group (A-H), their respective mutual spacing is t/4.
Claim 28
Dependent Claim
27 words
The position measuring instrument of claim 21, wherein said full bridge circuit comprises a quarter bridge having at least four magnetoresistive elements interconnected arbitrarily among one another.
Claim 29
Dependent Claim
24 words
The position measuring instrument of claim 21, wherein said periodic measurement scale division comprises magnetized regions of alternatingly opposite polarity in said measuring direction.
Claim 30
Dependent Claim
28 words
The position measuring instrument of claim 21, wherein said periodic measurement scale division comprises alternating regions of good magnetic conductivity and poor magnetic conductivity in said measuring direction.
Claim 31
Dependent Claim
15 words
The position measuring instrument of claim 27, wherein said scanner unit comprises a permanent magnet.
Claim 32
Dependent Claim
23 words
The position measuring instrument of claim 27, wherein said periodic measurement scale division comprises alternatingly successive lands and indentations in said measuring direction.
Claim 33
Dependent Claim
14 words
The measuring instrument of claim 21, wherein said evaluation device has an interpolation unit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-02-06 | 1998-08-08 | 1999-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-06 | 2002-08-08 | 2003-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-06 | 2006-08-08 | 2007-02-07 | $7700.00 | Window Closed / Lapsed |