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Scanning absolute thickness of the protective overcoat layer on spinning optical disks

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Abstract

The recording layer of optical disks is protected from scratches and dust particles by a transparent overcoat layer which keeps these defects out of focus. The servo control objective lens design requires negative spherical aberration to counter the effect of focusing through air and then a refractive layer. This limits the thickness range of the overcoat layer within which this lens can properly focus. A tester was built to scan absolute thickness and thickness variations of this layer on spinning optical disks.

© 1986 Optical Society of America

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