Browse Prior Art Database

Sound Head and Mounting

IP.com Disclosure Number: IPCOM000074495D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Reinheimer, RT: AUTHOR

Abstract

A sound head, shown in exploded view at A, uses a wear plate, shown in detail at B, C, and D, that serves both as an alignment channel and a wear surface.

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Sound Head and Mounting

A sound head, shown in exploded view at A, uses a wear plate, shown in detail at B, C, and D, that serves both as an alignment channel and a wear surface.

The sound head is a double ring, magnetic loop type used for record and playback. In the record mode, pre-erasure is necessary and is accomplished with a 45 degree 0.003 inch wide flux gap. The record gap is 0.0001 inch wide with a plus or minus tolerance of 10% desirable. Three magnetic pole pieces ("J" pieces 1 and 2 and "T" piece 3) are used to complete the double loop shared leg design. Since alignment of these pole pieces by spring clamp 4 is necessary, wear plate 5 is designed to serve as an alignment channel as well as a wear surface. The wear plate has the 45 degree 0.003 inch erase shim 6, shown at D, molded in, which serves as part of the interconnecting plastic to hold the wear plate together.

The sound head uses three thin-shell bobbins 7, 8, and 9 that fit over the pole pieces and a printed circuit board 10 for connections. The pole pieces are clamped together using small beryllium copper springs. The entire assembly is placed in a magnetic upper and lower case for stray field shielding.

In use, the sound head is mounted in a floating pivot, not shown, which is spring loaded to allow the sound head to adequately iron the recording belt media for best contact to assure an adequate recorded playback of recorded signals.

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