Patent US4058846A successfully refreshed from Google Patents.
US4058846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grounded transducer for magnetic record disks
Assignee: International Business Machines Corp
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Filing: 1976-06-21
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Granted: 1977-11-15
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Expires: 1996-06-21
Abstract
Abstract A transducer particularly for use with magnetic record disks and composed of cores having transducing gaps therein adapted to contact or be in near contact with a record disk at the gaps an composed also of outriggers on the sides of the cores for increasing the surface area of the transducer adapted to contact or be in near contact with a record disk. The cores are of ferrite and have windings thereon, and the outriggers are of ceramic, both the ferrite and ceramic being nonconductive electrically. One of the outriggers is provided with a plating of electrically conductive material on a side surface with the plating being coterminous with the surface of the outrigger adapted to contact the record disk or be in near contact with it, and a ground lead is connected with the plating so as to ground any electrostatic charge on the surface of the disk.
Inventors
- 👤 Gerald Roy Knutson
- 👤 Karl Allen Shidler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:34
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/032; G11B23/00; G11B23/50; G11B23/505; G11B5/00; G11B5/10; G11B5/11; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49048; Y10T29/49055
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
153 words
A magnetic head assembly for cooperating with a relatively moving magnetic medium comprising: a read-write core of electrically insulating and magnetically permeable material having a transducer gap in a contact surface of the head assembly adapted to contact or have a thin air bearing with the magnetic medium, a read-write winding on said core, an erase core of electrically insulating and magnetically permeable material having first and second opposite sides and bonded on its first side to said read-write core and having a transducer gap in said contact surface, an erase winding on said erase core, and a thin layer of electrically conducting material disposed on said second side of said erase core which is remote from said read-write core and extending away from and terminating on said contact surface of the head assembly so that static electricity carried by the magnetic medium may be conducted off of the medium through said layer.
Claim 2
Dependent Claim
153 words
A magnetic head assembly for cooperating with a relatively moving magnetic medium comprising: a read-write core of electrically insulating and magnetically permeable material having a transducer gap in a contact surface of the head assembly adapted to contact or have a thin air bearing with the magnetic medium, a read-write winding on said core, an erase core of electrically insulating and magnetically permeable material having first and second opposite sides and bonded on its first side to said read-write core and having a transducer gap in said contact surface, an erase winding on said erase core, and a thin layer of electrically conducting material disposed on said second side of said erase core which is remote from said read-write core and extending away from and terminating on said contact surface of the head assembly so that static electricity carried by the magnetic medium may be conducted off of the medium through said layer.
Claim 3
Dependent Claim
154 words
A magnetic head assembly for cooperating with a relatively moving magnetic medium comprising; a ferrite read-write core having a transducer gap in a contact surface of the head assembly adapted to contact or have a thin air bearing with the magnetic medium, a read-write winding on said core, a ferrite erase core having first and second opposite sides and bonded on its first side to said read-write core and having a transducer gap in said contact surface, an erase winding on said erase core, an outrigger of ceramic material disposed on said second side of said erase core which is remote from said read-write core, and a thin layer of electrically conducting material disposed between said outrigger and said erase core and extending away from and terminating on said contact surface of the head assembly so that static electricity carried by the magnetic medium may be conducted off of the medium through said layer.
Claim 4
Dependent Claim
154 words
A magnetic head assembly for cooperating with a relatively moving magnetic medium comprising; a ferrite read-write core having a transducer gap in a contact surface of the head assembly adapted to contact or have a thin air bearing with the magnetic medium, a read-write winding on said core, a ferrite erase core having first and second opposite sides and bonded on its first side to said read-write core and having a transducer gap in said contact surface, an erase winding on said erase core, an outrigger of ceramic material disposed on said second side of said erase core which is remote from said read-write core, and a thin layer of electrically conducting material disposed between said outrigger and said erase core and extending away from and terminating on said contact surface of the head assembly so that static electricity carried by the magnetic medium may be conducted off of the medium through said layer.
Claim 5
Dependent Claim
17 words
A magnetic head assembly as set forth in claim 2, said contact surface being a plane surface.
Claim 6
Dependent Claim
17 words
A magnetic head assembly as set forth in claim 2, said contact surface being a spherical surface.
Claim 7
Dependent Claim
38 words
A magnetic head assembly as set forth in claim 2, said thin layer of electrically conducting material constituting a metal plating on a surface of said outrigger which is adjacent to said second side of said erase core.
Claim 8
Dependent Claim
75 words
A magnetic head assembly as set forth in claim 5, said cores being fixed together by means of a bonding material and said plating and thereby said outrigger being fixed with respect to said erase core by means of a bonding material, said layer of electrically conducting material having a height measured off and away from said contact surface which is substantially less than the height of said erase core measured from said contact surface.
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) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |