Objective lens, optical head, optical system, and design...

Details Objective lens, optical head, optical system, and design... Objective lens, optical head, optical system, and design...

2006-08-29

2009-10-20

Edun, Muhammad N. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S011000, C369S112030, C369S044320

Reexamination Certificate

active

07606120

ABSTRACT:
An objective lens of this embodiment is used in an optical head in which a distance between a DVD laser and a CD laser is fixed. The objective lens focuses a laser beam emitted from the DVD laser on a DVD by a numerical aperture of 0.60, and focuses a laser beam emitted from the CD laser on a CD by an numerical aperture of 0.47. The wavefront aberration in design for CD is set greater than the wavefront aberration in design for DVD.

REFERENCES:
patent: 2003/0142414 (2003-07-01), Sugi et al.
patent: 2003/0189772 (2003-10-01), Maruyama et al.
patent: B2 3518684 (2004-04-01), None

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