Browse Prior Art Database

Reflective Sensing of Disc Edges

IP.com Disclosure Number: IPCOM000081839D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Lipp, J: AUTHOR [+2]

Abstract

In laminate formation of thin floppy discs rotating at high speeds, disc interfaces can be counted, for access separation control, by sensing reflection of light from edge surfaces of the discs. Contrast between light reflected from surface edges and light reflected from interface spaces between the discs may be enhanced by interspersing white polyester MELINEX* films between the floppy discs. The floppy discs are made of clear polyester MYLAR** coated with magnetic oxide, both the coating and clear substrate having a brown appearance edgewise.

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Reflective Sensing of Disc Edges

In laminate formation of thin floppy discs rotating at high speeds, disc interfaces can be counted, for access separation control, by sensing reflection of light from edge surfaces of the discs. Contrast between light reflected from surface edges and light reflected from interface spaces between the discs may be enhanced by interspersing white polyester MELINEX* films between the floppy discs. The floppy discs are made of clear polyester MYLAR** coated with magnetic oxide, both the coating and clear substrate having a brown appearance edgewise.

Referring to Fig. 1, the interleaved white films provide enhanced reflectance contrast. The brown oxide coating does not transmit through the opaque MELINEX. * Trademark of ICI America Co. ** Trademark of E. I. du Pont de Nemours & Co.

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