Optical pickup objective lens system

Details Optical pickup objective lens system Optical pickup objective lens system

2006-04-11

2006-04-11

Edun, Muhammed (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112240, C369S112010, C369S112080, C369S044230

Reexamination Certificate

active

07027379

ABSTRACT:
An optical pickup objective lens system for collecting a laser beam emitted from a light source onto a recording surface of an optical recording medium includes three lenses having negative, positive and negative powers sequentially, or positive, negative and positive powers sequentially in the order from the side of the light source toward the optical recording medium. The three lenses are bonded to one another through two joint faces, and each of the two joint faces is formed into an aspherical shape. Thus, the chromatic aberration can be corrected satisfactorily. Especially, even when a laser beam having a short wavelength is used, the recording and replaying of information can be carried out reliably and stably.

REFERENCES:
patent: 5251063 (1993-10-01), Baumann
patent: 2003/0210472 (2003-11-01), Morooka et al.
patent: 2005/0190455 (2005-09-01), Rostalski et al.

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