Browse Prior Art Database

Method of Reducing Tape Flying Height

IP.com Disclosure Number: IPCOM000076626D
Original Publication Date: 1972-Mar-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Thornley, RM: AUTHOR

Abstract

Shown is a schematic representation of a magnetic head mounted in a vacuum chamber. The problem of flying height of tape over a magnetic head is caused by the air around the head and is an aerodynamic effect.

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Method of Reducing Tape Flying Height

Shown is a schematic representation of a magnetic head mounted in a vacuum chamber. The problem of flying height of tape over a magnetic head is caused by the air around the head and is an aerodynamic effect.

To solve this problem, the above-shown apparatus evacuates the area 10 around the head to 0.0001 of the atmospheric pressure or less. In this environment, the tape height relative to the head may be better controlled by tape tension and small wrap angles.

Entry and exit by the tape into the evacuated chamber is through entry slot 12 and exit slot 14, respectively. Each slot is machined so as to provide a small amount of clearance between the tape and the slot. Air leaking into each slot is evacuated via small chambers 16 and 18 that are held at approximately 0.01 of the atmospheric pressure. Clearance between the tape and the top and bottom of the slots would be controlled by machining and by the leakage of air from the outside to the chambers 16 and 18.

Initially, to load the tape into the head area, the top half of the vacuum chamber would be mechanically lifted and then returned to operating position after the tape has been inserted.

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