Patent US3975771A successfully refreshed from Google Patents.
US3975771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head devices enclosed by a shield having superposed layers and an intervening layer of solder
Assignee: Compagnie Internationale pour l'Informatique CII-Honeywell Bull SA
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Filing: 1974-02-21
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Granted: 1976-08-17
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Expires: 1994-02-21
Abstract
Abstract In magnetic disk equipments or the like, the read/write magnetic heads are each bonded to the wall of a thru-hole of a carrier plate adapted to act as a "flying" member maintained by an aerodynamical action in close proximity to the surface of the rotating disk. In a device according to the invention, the bond between the lateral surface of the head and said wall is made to ensure magnetostatic and electrostatic shielding of the head against spurious magnetic, electromagnetic and electrostatic fields. Said bond may comprise thin films of a high permeability anisotropic material coating at least the facing surfaces of the head and the wall and a layer of solder intervening between said films. Such a shield may partially extend over selected areas of the rear faces of the plate and head.
Inventors
- 👤 Jean-Pierre Lazzari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:59
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; G11B5/11; G11B5/127; G11B5/31; G11B5/3109; G11B5/313; G11B5/3143; G11B5/3146; G11B5/3153
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
96 words
The combination of: a magnetic head enclosed in dielectric material, a dielectric carrier plate provided with a thru-hole in which said head is placed with its airgap face level with the front face of the carrier plate, a bonding arrangement of said head within said hole comprising a first thin film of a high permeability anisotropic material bonded to the wall of the hole, a second film of the same high permeability anisotropic material bonded to the surface of the head within said hole and an intervening layer of solder bonding together the two magnetic films.
Claim 2
Dependent Claim
96 words
The combination of: a magnetic head enclosed in dielectric material, a dielectric carrier plate provided with a thru-hole in which said head is placed with its airgap face level with the front face of the carrier plate, a bonding arrangement of said head within said hole comprising a first thin film of a high permeability anisotropic material bonded to the wall of the hole, a second film of the same high permeability anisotropic material bonded to the surface of the head within said hole and an intervening layer of solder bonding together the two magnetic films.
Claim 3
Dependent Claim
31 words
Combination according to claim 1, wherein a part of the rear face of the carrier plate which surrounds said hole is coated with the said first and the said solder films.
Claim 4
Dependent Claim
59 words
Combination according to claim 2, wherein discrete areas of the rear surface of the carrier plate are coated with a film of a high permeability anisotropic material and a film of solder material, the films of one of the said discrete areas being in continuity with the magnetic and solder films coating the said part of the rear face.
Claim 5
Dependent Claim
19 words
Combination according to claim 2, wherein a magnetostatic shield cup is soldered over the solder layer surrounding the thru-hole.
Claim 6
Dependent Claim
31 words
Combination according to claim 2, wherein the rear surface of the magnetic head is coated with a film of a high permeability anisotropic magnetic material and a film of solder material.
Claim 7
Dependent Claim
89 words
The combination of a magnetic head enclosed in dielectric material and a dielectric carrier plate provided with a through hole in which said head is located with its air gap face level with a face of said carrier plate and of a magnetostatic and electrostatic shield which functions as a bond between the facing surfaces of said head and said hole, said bond comprising a layer of high permeability anisotropic magnetic material on each said head and said plate, said layers connected by an intervening layer of metallic solder.
Claim 8
Dependent Claim
89 words
The combination of a magnetic head enclosed in dielectric material and a dielectric carrier plate provided with a through hole in which said head is located with its air gap face level with a face of said carrier plate and of a magnetostatic and electrostatic shield which functions as a bond between the facing surfaces of said head and said hole, said bond comprising a layer of high permeability anisotropic magnetic material on each said head and said plate, said layers connected by an intervening layer of metallic solder.
Claim 9
Dependent Claim
28 words
Combination according to claim 6, wherein the said magnetostatic and electrostatic shield bond is extended over a hole surrounding surface of the rear face of the carrier plate.
Claim 10
Dependent Claim
22 words
Combination according to claim 7, wherein the said magnetostatic and electrostatic shield bond is extended over the rear surface of the head.
Claim 11
Dependent Claim
22 words
Combination according to claim 7, wherein a magnetostatic shield cup is soldered over the extension of the magnetostatic and electrostatic shield bond.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |