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Magnetic Head Lapping Method

IP.com Disclosure Number: IPCOM000081089D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hahn, FW: AUTHOR

Abstract

This is a dynamic method of forming the physical shape or contour of a magnetic recording head, while measuring the flying height at the head's transducing gap or area.

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Magnetic Head Lapping Method

This is a dynamic method of forming the physical shape or contour of a magnetic recording head, while measuring the flying height at the head's transducing gap or area.

The head is tape-lapped to achieve final smoothness and contour using a flexible tape, in which diamond dust or other abrasive has been added to the recording media, i.e., iron oxide, formulation. The tape's iron oxide layer carries a prerecording magnetic transition pattern, or data, which is read by the head's gaps during tape movement. As material is removed from the off-gap area of the head, the tape's flying height over the head gaps changes.

The head gap signal is monitored and lapping is terminated when a desired signal, i.e., a desired flying height, is achieved. As an alternative, the tape may include alternate sections of prerecorded iron oxide and abrasive.

Preferably, the lapping tape has the same physical characteristics as the magnetic recording tape with which the finished head will be used. In addition, the path which the lapping tape is constrained to follow is preferably the same as that of the tape transport in which the finished head will be used.

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