Browse Prior Art Database

Magnetic Recording Head

IP.com Disclosure Number: IPCOM000090673D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Falk, RL: AUTHOR

Abstract

The head construction insures complete lapping of critical surfaces, parallel gap surfaces, and establishment of a minimum distance between gaps. Magnetic head 1 has two gaps 2 and 3 formed by appropriately ground J-pieces 4 and 5 assembled with a central T-member 6. The angularity of the points of contact allows for complete lapping of critical surfaces A-B. This insures a most accurate finish for pole faces, in contrast with other arrangements using a ground surface opposite a lapped surface. Gap surfaces A-B are inherently parallel in assembly due to the angular arrangement. Such also permits a minimum distance X between gaps 2 and 3 thus preventing echo that involves a delayed reproduction of audio signals emanating from the gap serving as the erase gap.

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Magnetic Recording Head

The head construction insures complete lapping of critical surfaces, parallel gap surfaces, and establishment of a minimum distance between gaps. Magnetic head 1 has two gaps 2 and 3 formed by appropriately ground J-pieces 4 and 5 assembled with a central T-member 6. The angularity of the points of contact allows for complete lapping of critical surfaces A-B. This insures a most accurate finish for pole faces, in contrast with other arrangements using a ground surface opposite a lapped surface. Gap surfaces A-B are inherently parallel in assembly due to the angular arrangement. Such also permits a minimum distance X between gaps 2 and 3 thus preventing echo that involves a delayed reproduction of audio signals emanating from the gap serving as the erase gap. An advantage is that wear during use down to line 0-E, for example, increases gap distance X causing an audible echo indicating replacement is due. Housing 7 includes locating pads for the pole pieces 4 and 5 plus a self-aligning bar K having a single screw S to simplify adjustment during assembly. The arrangement also permits the flash plating of jeweler's gold or copper on the outer ends of the recording pole pieces to eliminate handling of loose shims, as required in other methods.

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