Objective optical element, optical pickup device, and...

Details Objective optical element, optical pickup device, and... Objective optical element, optical pickup device, and...

2007-10-09

2007-10-09

Edun, Muhammad (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112230, C369S044250

Reexamination Certificate

active

10824758

ABSTRACT:
An objective optical element to be used for an optical pickup device for performing reproducing and/or recording of information to a first optical information recording medium and a second optical information recording medium by converging a light beam having a wavelength λ1(640 nm≦λ1≦670 nm) on the first optical information recording medium having a protective substrate thickness t1,and by converging a light beam having a wavelength λ2(400 nm≦λ2≦415 nm) on the second optical information recording medium having a protective substrate thickness t2;wherein an optical system magnification m1satisfies a relation of |m1|<0.01, and wherein an optical system magnification m2satisfies a relation of |m2|<0.01.

REFERENCES:
patent: 2001/0008513 (2001-07-01), Arai et al.
patent: 2002/0181366 (2002-12-01), Katayama

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