US4633456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two axis electromagnetic actuator
Assignee: International Business Machines Corp
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Filing: 1984-01-23
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Granted: 1986-12-30
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Expires: 2004-01-23
Abstract
Abstract A two axis electromagnetic actuator having balanced crossed coil structures supported by two sets of leaf springs and positioned in dual air gaps for motion in a direction representing the vector sum of the movement in two orthogonal directions.
Inventors
- 👤 Francis S. Luecke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:40
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0925; G11B7/0932; G11B7/0933; H; H02; H02K; H02K41/00; H02K41/02; H02K41/035; H02K41/0352; H02K41/0354; H02K2201/00; H02K2201/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
280 words
A two axis electromagnetic actuator comprising: a movable armature, first and second yokes, first and second permanent magnets fixed to one extension of each of said first and second yokes, producing two uniform magnetic flux fields of opposite directions across a first and a second air gap, a first coil wound around said movable armature in a generally circular fashion so that the individual conductors form a thin web oriented along a first axis and a portion of which intersects substantially all of the flux field area in the region of said first and second air gaps, a second coil wound around said movable armature in such a way that the individual conductors form a second web oriented along a second axis, which is perpendicular to and lies within a plane common to said first axis, said second thin web intersects substantially all of the flux field area in the region of said first and second air gaps, a spring carrier, first spring support means fixed to said armature and said carrier and oriented to flex only in a direction to permit motion of said armature within said air gaps along a first axis, second spring support means fixed to said carrier and a base member and oriented to flex only in a direction to permit motion of said carrier and said armature within said air gaps along a second axis which is perpendicular and lies within a plane common to said first axis, and said first and second spring support means oriented relative to each other so that flexure of one spring support means places flexure stress on the other spring support means only in its direction of flexure.
Claim 2
Dependent Claim
280 words
A two axis electromagnetic actuator comprising: a movable armature, first and second yokes, first and second permanent magnets fixed to one extension of each of said first and second yokes, producing two uniform magnetic flux fields of opposite directions across a first and a second air gap, a first coil wound around said movable armature in a generally circular fashion so that the individual conductors form a thin web oriented along a first axis and a portion of which intersects substantially all of the flux field area in the region of said first and second air gaps, a second coil wound around said movable armature in such a way that the individual conductors form a second web oriented along a second axis, which is perpendicular to and lies within a plane common to said first axis, said second thin web intersects substantially all of the flux field area in the region of said first and second air gaps, a spring carrier, first spring support means fixed to said armature and said carrier and oriented to flex only in a direction to permit motion of said armature within said air gaps along a first axis, second spring support means fixed to said carrier and a base member and oriented to flex only in a direction to permit motion of said carrier and said armature within said air gaps along a second axis which is perpendicular and lies within a plane common to said first axis, and said first and second spring support means oriented relative to each other so that flexure of one spring support means places flexure stress on the other spring support means only in its direction of flexure.
Claim 3
Dependent Claim
42 words
A two axis actuator according to claim 1 wherein a current is applied to said first coil to distort the flux path in a first direction thereby producing a force on said armature and said coil moving them along said first axis.
Claim 4
Dependent Claim
42 words
A two axis actuator according to claim 2 wherein a current is applied to said second coil to distort the flux path in a second direction thereby producing a force on said armature and said coil moving them along said second axis.
Claim 5
Dependent Claim
29 words
A two axis actuator according to claim 2 or 3 wherein the distance and direction of armature motion is responsive to the amplitude and polarity of said applied currents.
Claim 6
Dependent Claim
20 words
A two axis actuator according to any one of claims 1-4 wherein the air gaps contain a magnetic damping fluid.
Claim 7
Dependent Claim
39 words
The actuator or claim 3 for displacing an optical element for deflecting and/or focusing a beam of radiation impinging on a moving optical storage medium in an optical data storage system wherein: said movable armature carries said optical element.
Claim 8
Dependent Claim
27 words
An actuator according to claim 6 wherein the amplitude and the polarity of the current applied to said coils is determined by track and focus control circuits.
References Cited (Backward Citations)
EP0012650A1
Cited
US4321701A
Cited
EP0053476A2
Cited
GB2091902A
Cited
GB2097151A
Cited
EP0088010A1
Cited
GB2132034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |