Browse Prior Art Database

Coating a Cartridge Case to Extend the Life of an Optical Disk

IP.com Disclosure Number: IPCOM000120126D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Hayashi, R: AUTHOR [+4]

Abstract

Disclosed is a method for extending the life of an optical disk by coating the inside of a resinous cartridge case with a metal, a dielectric material, an organic polymer, or an inorganic polymer.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 64% of the total text.

Coating a Cartridge Case to Extend the Life of an Optical Disk

      Disclosed is a method for extending the life of an
optical disk by coating the inside of a resinous cartridge case with
a metal, a dielectric material, an organic polymer, or an inorganic
polymer.

      Gases that induce the corrosion of an optical disk's recording
material have been detected leaking from the resinous cartridge
case.  These gases are mainly organic compounds, such as acetone and
methylene chloride. When the cartridge case is not coated inside,
corrosion defects occur in the optical recording film during an
acceleration test in an environment with high temperature and
humidity (85oC and 85%, for example). These defects are exacerbated
by the corrosive gases leaking from the resinous cartridge case. As
is shown in the figure, the writing and reading error rates of the
disk increase with the acceleration time, owing to the increasing
number of defects.

      Compared with a non-coated cartridge case, a case coated inside
with a gold or stainless steel film (with a thickness of more than
100 nm) significantly reduces the number of corrosion defects found
in the optical recording film after the acceleration test.  In fact,
the error rate hardly increases when the case is coated, as is shown
in the figure.  Lubricants, fluorine-type or silicon-type materials,
surface improvement materials, and photochemical hardening materials
coating are similarly effective.  The film coating...