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Precision Mounting of Magnetic Read Heads Using Potting Compound

IP.com Disclosure Number: IPCOM000083433D
Original Publication Date: 1975-May-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 3 page(s) / 84K

Publishing Venue

IBM

Related People

Daly, JL: AUTHOR [+4]

Abstract

Opposed magnetic read/write heads 10 and 12 are fixed with respect to a common carriage 14 by quick cure bodies 16 of potting compound. Heads 10 and 12 are, respectively, attached to arms 14a and 14b of carriage 14 and have a thin magnetic rotatably driven record disk 18 passing between them. Carriage 14 has lead screw 20 passing through it and in threaded engagement with it, for positioning heads 10 and 12 on different concentric magnetic tracks on disk 18 as screw 20 is adjustably rotated. Carriage 14 is pivoted on screw 20 so that either head 10 or head 12 may be moved toward disk 18, to be in data transferring relationship with respect to disk 18.

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Precision Mounting of Magnetic Read Heads Using Potting Compound

Opposed magnetic read/write heads 10 and 12 are fixed with respect to a common carriage 14 by quick cure bodies 16 of potting compound. Heads 10 and 12 are, respectively, attached to arms 14a and 14b of carriage 14 and have a thin magnetic rotatably driven record disk 18 passing between them. Carriage 14 has lead screw 20 passing through it and in threaded engagement with it, for positioning heads 10 and 12 on different concentric magnetic tracks on disk 18 as screw 20 is adjustably rotated. Carriage 14 is pivoted on screw 20 so that either head 10 or head 12 may be moved toward disk 18, to be in data transferring relationship with respect to disk 18.

A swingable bail 22 positioned in a fork 24 fixed to carriage 14 may be used to pivot carriage 14 about lead screw 20, for rendering either head 10 or head 12 effective. Heads 10 and 12 are fixed in housings 26 and 28, respectively, which in turn are fixed to carriage 14 by the potting compound 16.

Head 10 comprises a magnetic core 10a having a gap 10b which may be used for reading or writing magnetically on disk 18. Supplementary cores 10c which nay have erase gaps in them are provided on opposite sides of core 10a, and the cores 10a and 10c are disposed between wear blocks 10d. Parts 10a- 10d are embedded in a capsule or housing 30. Then the parts 10a-10d and the end of housing 30 are lapped to provide spherical surface 34.

Housing 30 is fixed in and with respect to housing 26 by potting compound 37 poured between the sides of housing 30 and the sides of cavity 38 formed in housing 26, with the housing 30 resting on a shoulder 39 formed in housing 26, as shown in section b-b. Gap 10b is located accurately with respect to the reference surfaces 57, 58 and 59 of housing 26 utilizing reference cross hairs 36a and 36b, which are fixed at the time with respect to housing 25 and which, respectively, pass along the longitudinal center line of the core 10a and through the gap 10b. Head 12 is similarly fixed with respect to housing 28.

Precision positioning of housings...