Browse Prior Art Database

Creating Hermetic Seals to Enhance the Environmental Stability of Optical Recording Disks

IP.com Disclosure Number: IPCOM000040675D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Cuomo, JJ: AUTHOR [+5]

Abstract

Discussed is a method of applying hermetic sealing to coating materials of optical disks, so as to provide long term environmental protection without affecting the inherent structural stability of the recording and erasable properties of the disks. By using hermetic sealing, the concept improves on previously used techniques, which used organic adhesive and did not provide long term environmental protection to seal the critical materials from the effects of oxygen and moisture. The concept is particularly applicable to optical disks which use materials, such as rare earth-transition metal amorphous films, to provide erasability as well as high density optical recording.

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Creating Hermetic Seals to Enhance the Environmental Stability of Optical Recording Disks

Discussed is a method of applying hermetic sealing to coating materials of optical disks, so as to provide long term environmental protection without affecting the inherent structural stability of the recording and erasable properties of the disks. By using hermetic sealing, the concept improves on previously used techniques, which used organic adhesive and did not provide long term environmental protection to seal the critical materials from the effects of oxygen and moisture. The concept is particularly applicable to optical disks which use materials, such as rare earth-transition metal amorphous films, to provide erasability as well as high density optical recording. The technique of creating a hermetic seal between the media and the environment involves bonding the media of an optical disk to a plate of alkali containing glass, with a thin aluminum film interlayer approximately 0.2 - 1.0 microns thick at a temperature of under 200oC for several minutes. The aluminum is deposited on top of the recording media prior to bonding to the glass plate. Alternatively, the medium of this first optical disk can also be bonded to the medium of a second optical disk by using aluminum and glass thin film interlayers. In this case, aluminum thin film is deposited on top of the medium of one disk and glass thin film is applied on top of the medium of the other disk, prior to bonding, as...