Browse Prior Art Database

Head Compliance System for Flexible Magnetic Disk

IP.com Disclosure Number: IPCOM000085699D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 3 page(s) / 60K

Publishing Venue

IBM

Related People

King, FK: AUTHOR [+3]

Abstract

The system includes a pair of magnetic read/write heads 13 and 13a which are located on opposite sides of a flexible magnetic disk 11, and are spaced arcuately with respect to the center 11a of disk 11.

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Head Compliance System for Flexible Magnetic Disk

The system includes a pair of magnetic read/write heads 13 and 13a which are located on opposite sides of a flexible magnetic disk 11, and are spaced arcuately with respect to the center 11a of disk 11.

Magnetic disk 11 (Fig. 1) is made of relatively thin polyethylene terephthalate or MYLAR* R, for example, and is disposed in cartridge 12 which is of thicker but somewhat flexible material. The assembly of disk 11 and cartridge 12 is similar to that shown in U.S. Patent 3,668,658, but the two thicknesses of cartridge 12 at one edge are not joined together so that the cartridge may be opened at this edge. This permits the insertion of heads 13 and 13a and disk stabilizing platforms 15 and 15a carrying the heads Figs. 2-5z).

Heads 13 and 13a are, respectively, disposed within contoured sliders 14 and 14a rigidly mounted in platforms 15 and 15a that, in turn, are mounted on moveable carriage 16. Platform 15 is provided with spaced pads 17 on opposite sides of slider 14, and platform 15a is provided with corresponding pads 17a on opposite sides of slider 14a.

Leading slider 14 is provided with a spherical surface 20 on its surface facing disk 11 which extends for the complete diameter of slider 14 in the direction A of disk movement. Spherical surface 20 has radii m and n which are equal, but radius n has its center spaced a small distance p from the center line of slider 14. The narrowest width of spherical portion 20 is given by the dimension g in Fig. 4x.

Trailing slider 14a is very similar in construction to leading slider 14 and has a spherical surface 21 extending in the direction A of disk movement, but surface 21 is formed on equal radii mm and nn which are greater than radii m and n. The center of radius nn is spaced from the center of slider 14a by the distance pp which is equal to distance p, but the center of radius nn is located in the direction A from the center line of slider 14a while the center of radius n is located in a direction opposite to the direction A with respect to the center of slider 14.

When platforms 15 and 15a together with sliders 14 and 14a and heads 13 and 13a are moved into the cartridge 12 by carriage 16, sliders 14 and 14a embrace disk 11 and cause it to have a wavy contour over sliders 14 and 14a, since the spherical surfaces 20 and 21 overlap eac...