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Browse Prior Art Database

Floppy Disk Surface Measurement

IP.com Disclosure Number: IPCOM000044238D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Geist, T: AUTHOR

Abstract

The surface uniformity resulting from the burnishing of a floppy magnetic recording disk is checked by measuring the surface gloss at 10Πincrements about the entire circumference of the disk. None of the gloss measurements should vary from a standard amount by more than a preselected value. The figure shows the top view of a flat fixture plate 10 upon which a floppy disk 11 is positioned, under a mask 12, shown in dotted lines. Mask 12 includes an aperture 13 through which an area 14 of the disk is viewed. Mask 12 remains stationary, and the disk is rotated about axis 15, in 10Πincrements. A gloss reading is taken at each position of the disk. Disk area 14 is illuminated at an angle of 45Π(other angles can be used) to the plane of plate 10.

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Floppy Disk Surface Measurement

The surface uniformity resulting from the burnishing of a floppy magnetic recording disk is checked by measuring the surface gloss at 10OE increments about the entire circumference of the disk. None of the gloss measurements should vary from a standard amount by more than a preselected value. The figure shows the top view of a flat fixture plate 10 upon which a floppy disk 11 is positioned, under a mask 12, shown in dotted lines. Mask 12 includes an aperture 13 through which an area 14 of the disk is viewed. Mask 12 remains stationary, and the disk is rotated about axis 15, in 10OE increments. A gloss reading is taken at each position of the disk. Disk area 14 is illuminated at an angle of 45OE (other angles can be used) to the plane of plate 10. The reflected light is intensity measured by the use of a glossmeter (not shown) which sits on top of mask 12 and views disk area 14 through aperture 13. Rotation of disk 11 is facilitated by two marks 16 and 17 which are placed on the disk. Too great a deviation in gloss measurement, about the disk circumference, is an indication of an irregular finish on the disk (i.e., nonuniform burnishing of the disk surface).

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