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Browse Prior Art Database

Encapsulation Process for M-O Media using Thin Glass Microsheet

IP.com Disclosure Number: IPCOM000112008D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Hahn, BR: AUTHOR [+2]

Abstract

Disclosed is a process for providing a hermetic covering for an M-O disk, enabling a read/write optical head to be positioned within close proximity to the active media. Also disclosed is a method for producing an optical disk substrate which permits optical drives to rotate at speeds comparable to magnetic storage drives.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Encapsulation Process for M-O Media using Thin Glass Microsheet

      Disclosed is a process for providing a hermetic covering for an
M-O disk, enabling a read/write optical head to be positioned within
close proximity to the active media.  Also disclosed is a method for
producing an optical disk substrate which permits optical drives to
rotate at speeds comparable to magnetic storage drives.

      Encapsulation of Optical Disk - A thin glass sheet (e.g., 100
um thickness) is bonded with a polymer such as Siloxane-Epoxy rubber
to the surface of a magneto-optic disk.  The glass microsheet
provides environmental protection to the M-O acitve layers and
enables the read/write head to be positioned very close to these
active layers (e.g., within 100 um).  The Siloxane Epoxy adhesive
provides low stress bonding, good optical quality due to low
absorbtion, and excellent bond stability in high temperature and/or
humidity environments.  The combination of the glass microsheet,
Siloxane, and glass substrates provides favorable mechanical
properties such as resistance to fracture and resonance damping.

      Stored data may be read through the glass substrate in the
conventional manner, utilizing the thin coverglass solely for
environmental encapsulation.  Alternatively, data may be read through
the thin coverglass.

      The present invention offers a number of technological
advantages over the prior art.  Due to close head proximity and the
fact that a doubl...