Optical characteristic measuring apparatus for an optical record

Details Optical characteristic measuring apparatus for an optical record Optical characteristic measuring apparatus for an optical record

1987-04-09

1989-06-20

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 54, 369 58, 369110, 369122, G11B 7125

Patent

active

048415103

ABSTRACT:
A structure of an optical pickup. The optical pickup has a substrate used for an optical recording medium. The optical pickup is provided with a device for condensing and radiating a polarized light and a light receiving device for receiving, through an analyzer set in a crossed Nicol state, the reflected light of this substrate or the above mentioned polarized light on the light transmitted side. The amount the C/N (carrier to noise ratio) is reduced or increased based on the substrate may be evaluated by the light amount received by the light receiving device.

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"Measurement of the Thickness and Refractive Index of Very Thin Films and the Optical Properties of Surfaces by Ellipsometry": vol. 67A, No. 4, Jul.-Aug. 1963, Journal of Research of the National Bureau of Standards A. Physics and Chemistry.

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