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Flying Height Control in a Rotating Head Magnetic Tape Recorder

IP.com Disclosure Number: IPCOM000083322D
Original Publication Date: 1975-May-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Primavera, DK: AUTHOR [+4]

Abstract

Shown is a portion of a rotor 16 carrying a slotted magnetic head 18. Rotor 16 is mounted between two cylindrical mandrels, not shown, about which magnetic tape is helically wrapped. Rotor 16 carries magnetic head 18 under the tape to record slant tracks on the magnetic tape. To obtain controlled flying height of the head 18 relative to the tape, a number of options are available.

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Flying Height Control in a Rotating Head Magnetic Tape Recorder

Shown is a portion of a rotor 16 carrying a slotted magnetic head 18. Rotor 16 is mounted between two cylindrical mandrels, not shown, about which magnetic tape is helically wrapped. Rotor 16 carries magnetic head 18 under the tape to record slant tracks on the magnetic tape. To obtain controlled flying height of the head 18 relative to the tape, a number of options are available.

As shown, rotor 16 contains holes 24 through which air may be forced to make the rotor air bearing. In addition, head 18 carries slots 20. slots 20 allow air trapped between the surface of head 18 and the tape to bleed away, and thus lower the flying height of the tape relative to the head 18.

Further control of the flying height is provided by air passages flanking the periphery of head 18. Four passages are shown -- 26 at the front of the head, 28 at the left side of the head, 32 at the back of the head, and 30 at the right side of the head. As shown, each of these forced air passages has an air flow depicted by the arrows rising up from the passages. The quantity of their flow in each passage is independently controllable to control the flying height of the magnetic tape relative to the top surface of the magnetic head 18. Further, positive or negative air pressures could exist in each passage independently, to blow the tape up or draw the tape down on the head 18.

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