Neil C Robinson

US Patent:

41886496, Feb 12, 1980

Filed:

Dec 5, 1977

Appl. No.:

5/857500

Inventors:

Samuel D. Cheatham - Arvada CO
Neil L. Robinson - Boulder CO
Edmond W. Smathers - Boulder CO

Assignee:

IBM Corporation - Armonk NY

International Classification:

G11B 525

US Classification:

360118

Abstract:

An AC magnetic erase head having improved AC erase characteristics, the magnetic head being formed of two half core elements of a magnetic material, preferably ferrite, defining an irregular edged or jagged-edged gap, and including a non-magnetic substance, preferably glass, within the gap. The magnetic head is preferably produced by thermally etching ferrite magnetic material forming the half core elements by means of relatively prolonged heat soak at an elevated temperature.

US Patent:

41504798, Apr 24, 1979

Filed:

Apr 19, 1978

Appl. No.:

5/897887

Inventors:

Paul D. Losee - Longmont CO
Neil L. Robinson - Boulder CO

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 542

US Classification:

29603

Abstract:

A method for batch fabricating magnetic heads with a desired cant angle in the transducing surface of the magnetic core. The cant angle reduces the "Minor Bit" phenomenon. The two parts of the core which require the cant angle are mounted on a fixture so that a grind wheel is simultaneously in contact with both parts. Materials are simultaneously subtracted (i. e. , grind away) from both parts to create mirror images at the surfaces which adjoin the grind wheel. The surfaces are then cleaned and glassed to provide a core bar with intimate fit. The core bar is diced into individual cores and is lapped to size. The individual cores are then fitted into a slider assembly to form the magnetic head.

US Patent:

39552136, May 4, 1976

Filed:

Mar 11, 1974

Appl. No.:

5/450138

Inventors:

Ralph D. Brower - Longmont CO
Neil L. Robinson - Boulder CO

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 522
E05F 1102

US Classification:

360122

Abstract:

A head is moved toward and rotated against an abrasive while its resistance is monitored by a four-lead bridge. Prior to final manufacture, the head includes a highly conductive segment which surrounds the active head element on three sides and is electrically connected to it at one point. The segment is ground away during manufacture. Two leads from the head are connected to two slip rings, and each slip ring has two pairs of brushes, each wire from the bridge going to a different brush pair. Head movement toward the abrasive is terminated when a predetermined head resistance is detected by the bridge.