Method of testing optical information medium

Details Method of testing optical information medium Method of testing optical information medium

2004-03-04

2009-02-03

Williams, Hezron (Department: 2856)

Measuring and testing

By abrasion, milling, rubbing, or scuffing

C428S064100, C428S064400

Reexamination Certificate

active

07484400

ABSTRACT:
A testing method capable of quantifying abrasion resistance on the translucent base surface of a high-recording-density optical information medium simply and in a form of reflecting an actual application environment, and judging criteria appropriate for the testing method. When an evaluation test in terms of abrasion resistance on a laser beam incident-side surface is conducted on an optical information medium to and/or from which recording and/or reproducing is made by a laser beam shone into an information recording layer from a translucent base side, and which has the focused radius R, of a recording/reproducing laser beam on the translucent base surface, of 40-400 μm, defined by the following expression (1) R=2T tan [sin−1(NA
)](1) (in the expression, T is the thickness (μm) of the translucent base, NA numerical aperture of an object lens in the recording/reproducing device, and n refractive index of the translucent base), the abrasion resistance on a laser beam incident-side surface is evaluated based on the error amount of a reproduction signal after a laser beam incident-side surface is abraded by an abrasion wheel specified in ISO9352.

REFERENCES:
patent: 6576320 (2003-06-01), Hayashida et al.
patent: 6630562 (2003-10-01), Ogawa et al.
patent: 6973014 (2005-12-01), Ihde
patent: 09-100111 (1997-04-01), None
patent: 2002-260280 (2002-09-01), None

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