Condensing optical system with corrected chromatic aberration, a

Details Condensing optical system with corrected chromatic aberration, a Condensing optical system with corrected chromatic aberration, a

1991-05-15

1993-04-13

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

359795, 369112, G11B 709

Patent

active

052028674

ABSTRACT:
A condensing optical system for condensing light from a record medium onto a photodetector in such as an optical information recording/reproducing system, comprises a first lens group and a second lens group, and these first and second lens groups cooperate to correct aberrations, especially a chromatic aberration, in the system with respect to plural wavelengths of lights esp. by making Abbe's numbers of those first and second lens groups different from each other.

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Yoshiya Matsui Lens Design (Kyoritsu Publishing Co., 1972), pp. 114-117.

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