Browse Prior Art Database

Magnetic Head Arm Assembly

IP.com Disclosure Number: IPCOM000052268D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Wright, WL: AUTHOR

Abstract

As depicted in Fig. 1, a magnetic head arm 1 supports an assembly including a ceramic substrate 2 attached to a copper pedestal base 3 by means of solder or a thermally conductive epoxy film 4. A lid 5, made of ceramic or metal, is attached to the ceramic substrate to enclose electronic components 6 mounted on the substrate.

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Magnetic Head Arm Assembly

As depicted in Fig. 1, a magnetic head arm 1 supports an assembly including a ceramic substrate 2 attached to a copper pedestal base 3 by means of solder or a thermally conductive epoxy film 4. A lid 5, made of ceramic or metal, is attached to the ceramic substrate to enclose electronic components 6 mounted on the substrate.

The ceramic substrate includes wraparound terminals spaced around its perimeter. The top of the substrate contains a pattern of electrical lands which connect the electronic components and terminals. Connection to the sensing heads and off-arm electronics is made via a multilayer flat cable 7. The substrate terminal pad connections on the flat cable are spaced around an opening in the cable so that they align with the substrate terminals. Connection between the substrate terminals and cable pads is made by reflowed solder joints 8.

The copper pedestal base 3, which is electrically isolated from the arm frame, serves as a ground plane and as a common return point for electronic circuitry, and ground plane shielding in the multilevel flat cable. The pedestal also serves as a heat diffuser, thus providing a means of effectively transferring heat generated by the arm electronics components into the arm frame, which is an efficient heat sink to ambient air.

A significant reduction in signal line length and an ability to arrange line orientation to minimize line coupling are realized. As shown in Fig. 2, a servo electroni...