Stock material or miscellaneous articles – Circular sheet or circular blank
Reexamination Certificate
2007-10-09
2007-10-09
Mulvaney, Elizabeth (Department: 1774)
Stock material or miscellaneous articles
Circular sheet or circular blank
C428S064400, C430S270130, C106S420000, C204S298130
Reexamination Certificate
active
10503296
ABSTRACT:
Provided is a sputtering target and an optical recording medium having formed thereon a phase change optical disc protective film having zinc sulfide as its principal component employing such a target, as well as the manufacturing method thereof, characterized in that the sputtering target has zinc sulfide as its principal component, and is capable of adjusting the refractive index of a film containing conductive oxide in the range of 2.0 to 2.6. This sputtering target, and an optical recording medium having formed thereon a phase change optical disc protective film having zinc sulfide as its principal component employing such a target, is capable of reducing particles (dust emission) and nodules that arise during sputtering, has minimal variation in quality and is capable of improving mass productiveness, and in which the crystal grain is fine and has a high density of 90% or more.
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Takami Hideo
Yahagi Masataka
Howson & Howson LLP
Mulvaney Elizabeth
Nippon Mining & Metals Co., Ltd.
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