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Browse Prior Art Database

Rotary Burnish Head and System

IP.com Disclosure Number: IPCOM000052764D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Hagopian, JJ: AUTHOR

Abstract

A rotary burnish device is provided to remove protrusions from the surface of a magnetic recording disk. A ceramic material was chosen for the rotary burnish head, and various land designs, illustrated in Fig. 1, were fabricated by diamond wheel machining. Tests showed that the rotary head developed an adequate self-generated air bearing when the external air was shut off, and that with sufficient spring loading, the spacing could be brought down to the surface-burnishing range. It was further observed that particles resulting from the rotary burnish action had a greater tendency to adhere to the edges of the burnish head lands than be blown or drawn away.

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Rotary Burnish Head and System

A rotary burnish device is provided to remove protrusions from the surface of a magnetic recording disk. A ceramic material was chosen for the rotary burnish head, and various land designs, illustrated in Fig. 1, were fabricated by diamond wheel machining. Tests showed that the rotary head developed an adequate self-generated air bearing when the external air was shut off, and that with sufficient spring loading, the spacing could be brought down to the surface- burnishing range. It was further observed that particles resulting from the rotary burnish action had a greater tendency to adhere to the edges of the burnish head lands than be blown or drawn away.

To provide a rotary burnish head configuration having inherent long-term operating stability, negligible likelihood of disk surface damage by the burnish head, and a glide height of 5 microinches or less to accomplish significant improvement of disk surface quality, the configuration shown in Fig. 2 was developed. The major features are:

1. Radial rectangular lands having symmetry of location circumferentially, and about the center of rotation. This insures matched air bearing lift acting on opposite lands to establish parallel relationship between the common plane of the land faces and the disk surface.

2. A total area for the lands in the order of 0.04 square inch or less to insure spacing from the disk surface less than 10 microinches at 500 rpm and loading not greater than 5...