Browse Prior Art Database

Selectable Track Transducer

IP.com Disclosure Number: IPCOM000091380D
Original Publication Date: 1968-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Braun, RE: AUTHOR

Abstract

U.S. Patent 3,327,916 shows a magnetic transducer arranged to maintain a controlled thickness air film between its operating surface and a magnetic record tape moved over it. The control arrangement includes one or more vacuum ports in the operating surface of the transducer near its leading edge. The slots withdraw air from beneath the tape at a controlled rate as the tape passes over them and establish a lubricating air film having the desired thickness.

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Selectable Track Transducer

U.S. Patent 3,327,916 shows a magnetic transducer arranged to maintain a controlled thickness air film between its operating surface and a magnetic record tape moved over it. The control arrangement includes one or more vacuum ports in the operating surface of the transducer near its leading edge. The slots withdraw air from beneath the tape at a controlled rate as the tape passes over them and establish a lubricating air film having the desired thickness.

The transducer shown above makes use of the arrangement described in the patent to accomplish track selection. The transducer has the general characteristics described in the patent, but has in its operating surface 1 a plurality of separate vacuum ports 2. The latter are arranged near the leading edge of the operating surface and are aligned with several transducing gaps 3 that read or record information on different tracks on tape 4. Each port 2 is connected via a separate control valve 5 to a vacuum source. Selection of a particular track on the tape to be read or written is accomplished by opening the valve 5 corresponding to that track. Vacuum is applied to the port 2 aligned with the desired track and the portion of the tape containing the track is drawn to the desired separation distance for signal transfer. The remainder of the tape passes over the transducers at a greater separation and, is not affected. Track- to-track interference and tape and head wear are thus minimized....