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US3672045A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for bonding magnetic heads

Assignee: Surface Technology Corp
•
Filing: 1970-04-29
•
Granted: 1972-06-27
•
Expires: 1990-04-29
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Abstract

Abstract A process is disclosed for bonding magnetic heads by forming a low magnetic permeability spacer between pole pieces of a magnetic head. A primary gap material is deposited, preferably by R.F. sputtering, on the pole pieces. A bonding layer is deposited over the primary gap material, also preferably by R.F. sputtering. The thus coated pole pieces are vacuum degassed and heated to a temperature in the range of 150* to 450* C. The bonding layers are then mated and a pressure of from 50 to 100 psi is applied and held between 1/2 and 4 hours. Any material which has a relatively low magnetic permeability and can be applied by R.F. sputtering or thermal evaporation is suitable for the primary gap material. The bonding layer is formed of either copper, silver, gold or titanium, or any material which produces a good diffusion bond under the above conditions.

Inventors

  • 👤 David D Robertson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 10:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/23; G11B5/235; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49039

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 65 words
The method of claim 1 including a step of holding the first and second pole faces with the primary gap material and bonding layers thereon at a temperature within the range 150* to 250* C and a vacuum within the range 10-7 Torr to 10-11 Torr to permit vacuum degassing of the first and second pole faces and the primary gap material and bonding layers.
Claim 2
Dependent Claim 19 words
The method of claim 1 wherein the primary gap material and the bonding layers are deposited by R.F. sputtering.
Claim 3
Dependent Claim 22 words
The method of claim 1 wherein in said joining step the pressure is applied for a period between 1/2 and 4 hours.
Claim 4
Dependent Claim 34 words
The method of claim 1 wherein the primary gap material is selected from the group consisting of molybdenum, tungsten, silicon nitride, alumina, tantalum, copper, gold, tantalum nitride, silicon monoxide, silver, glasses and metal-ceramic combinations.
Claim 5
Dependent Claim 21 words
The method of claim 5 wherein the bonding layers are selected from the group consisting of copper, silver, gold and titanium.
Claim 6
Dependent Claim 19 words
The method of claim 6 wherein the primary gap material and the bonding layers are deposited by R.F. sputtering.
Claim 7
Dependent Claim 22 words
The method of claim 7 wherein the primary gap material is deposited to a thickness within the range 5 to 150 micro-inches.
Claim 8
Dependent Claim 22 words
The method of claim 8 wherein the bonding layer is deposited to a thickness within the range 500 to 1,000 A. units.
Claim 9
Dependent Claim 19 words
The method of claim 9 wherein said joining step takes place in a vacuum of at least 10-8 Torr.

References Cited (Backward Citations)

US3098126A Cited
US3246384A Cited
US3505041A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-06-27 1975-12-27 1976-06-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-06-27 1979-12-27 1980-06-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-06-27 1983-12-27 1984-06-27 $7700.00 Window Closed / Lapsed

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