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SANDWICH STRUCTURE TO IMPROVE AND PROTECT OPTICAL DISK MEDIA

IP.com Disclosure Number: IPCOM000025477D
Original Publication Date: 1985-Aug-31
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal

Abstract

The optical disk sandwich structure described herein is a substitute for the Phillips trilayer disk. It is designed for the optical disk requirements of a read only player. The figure shows tellurium (Te) as the recording medium which requires protection from humidity and corrosive furnes. Disk edges are masked off during the Te and MgF2depositions. The MgF2 is the transparent spacer layer 1/4 wavelength in thickness. MgF2 is a low refractive index (1.38) coating that is substituted for Si02 in antireflection and bandpass filter coatings. A passivation agent is required to protect the MgF2 as well as the Te.