US5808273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for tuning a magneto-resistive sensor
Assignee: Robert Bosch GmbH
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Filing: 1994-10-07
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Granted: 1998-09-15
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Expires: 2014-10-07
Abstract
Abstract A process for adjusting a magneto-resistive sensor having a pair of current contacts and a pair of voltage contacts to compensate an offset error, without additional components. The magneto-resistive sensor (10) is charged with a homogeneous, definitely oriented magnetic field, a defined control current (I) is applied between its current contacts (22, 24) and at least one of the voltage contacts (30, 32) is trimmed, for example, by a laser beam (38), during the measurement of a pseudo-Hall voltage across the voltage contacts.
Inventors
- 👤 Rudolf Galster
- 👤 Guenter Gerlach
- 👤 Anton Dukart
- 👤 Klaus Marx
- 👤 Franz Jost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:28
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/09; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
A process for adjusting a magneto-resistive sensor having a pair of current contacts and a pair of voltage contacts extending perpendicular to an axis of the pair of current contacts, said process comprising: applying a definite control current (I) between the pair of current contacts; charging the sensor with a homogeneous magnetic field oriented parallel to the current direction of the control current, and thus at a 0° magnetization angle between the magnetic field and the direction of the control current; measuring a pseudo-Hall voltage across said pair of voltage contacts to detect a value (c) representing an offset; and, trimming a lateral surface of at least one of the voltage contacts, which surface extends transverse to the current contact axis, during the measuring of the pseudo-Hall voltage to reduce the offset value (c).
Claim 2
Dependent Claim
134 words
A process for adjusting a magneto-resistive sensor having a pair of current contacts and a pair of voltage contacts extending perpendicular to an axis of the pair of current contacts, said process comprising: applying a definite control current (I) between the pair of current contacts; charging the sensor with a homogeneous magnetic field oriented parallel to the current direction of the control current, and thus at a 0° magnetization angle between the magnetic field and the direction of the control current; measuring a pseudo-Hall voltage across said pair of voltage contacts to detect a value (c) representing an offset; and, trimming a lateral surface of at least one of the voltage contacts, which surface extends transverse to the current contact axis, during the measuring of the pseudo-Hall voltage to reduce the offset value (c).
Claim 3
Dependent Claim
33 words
A process in accordance with claim 1, wherein, depending on a positive or a negative offset value (c), the at least one voltage contact is trimmed from opposite side surfaces of the contact.
Claim 4
Dependent Claim
32 words
A process in accordance with claim 1, wherein, in the course of adjustment of a circuit consisting of first and second series connected magneto-resistive sensors, they are adjusted one after the other.
Claim 5
Dependent Claim
96 words
A process in accordance with claim 3, wherein the first an second series connected magneto-resistive sensors are oriented such that their respective voltage contact axes are oriented at a defined angle with respect to each other, and further including, during the adjustment of the first magneto-resistive sensor, setting the magnetization angle of 0°, originating from a permanent magnet, in relation to the first sensor, and during the adjustment of the second magneto-resistive sensor, setting the magnetization angle of 0° in relation to the second sensor or at the defined angle in relation to the first sensor.
Claim 6
Dependent Claim
13 words
A process as defined in claim 4, wherein said defined angle is 45°.
Claim 7
Dependent Claim
44 words
A process in accordance with claim 3, wherein the adjustment is performed dynamically and, following several turns of a permanent magnet, the value (c) representing the offset is determined by calculation and then the trimming of the at least one voltage contact takes place.
Claim 8
Dependent Claim
30 words
A process in accordance with claim 1, wherein trimming of the at least one voltage contact takes place until the value (c) representing the offset has a value of 0.
Claim 9
Dependent Claim
17 words
A process as defined in claim 1, wherein said trimming is carried out by a laser beam.
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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) | 2001-09-14 | 2002-03-16 | 2002-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-14 | 2006-03-16 | 2006-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-14 | 2010-03-16 | 2010-09-15 | $7700.00 | Window Closed / Lapsed |