Floppy Disk Surface Measurement
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
The surface uniformity resulting from the burnishing of a floppy magnetic recording disk is checked by measuring the surface gloss at 10Œ 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 10Œ increments. A gloss reading is taken at each position of the disk. Disk area 14 is illuminated at an angle of 45Œ (other angles can be used) to the plane of plate 10.