Compound objective lens with fold mirror

Details Compound objective lens with fold mirror Compound objective lens with fold mirror

2006-10-17

2006-10-17

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112280

Reexamination Certificate

active

07123571

ABSTRACT:
A compound objective lens includes a first lens element and a second lens element, the first element including a mirror surface for internally redirecting a radiation beam passing through the first element. The objective lens has a numerical aperture greater than 0.65, and the focal length F1of the first element is related to the focal length F of the objective lens by the relation:F1F>2.5.

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