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Throat Height Determination Technique For Inductive Heads Disclosure Number: IPCOM000066211D
Original Publication Date: 1979-Feb-01
Included in the Prior Art Database: 2005-Feb-19

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Cheatham, SD Smathers, EW [+details]


This article describes a passive throat height determination technique which is designed into a magnetic recording head. The technique provides a high degree of accuracy without requiring highly accurate measuring equipment. A measure of apex location and/or throat squareness to the core is also achieved. The technique utilizes a plated or deposited indicator placed on one side of the core sandwich prior to the core assembly operation. This indicator, which may have various shapes (e.g., triangular, arrow, chevron), shows when the desired throat height is approaching as the lapping process progresses. The indicator material C is also removed as the core is lapped down, thereby removing it from the gap area.