Objective lens, optical pick-up device, and optical disk device

Details Objective lens, optical pick-up device, and optical disk device Objective lens, optical pick-up device, and optical disk device

2007-10-03

2010-10-12

Edun, Muhammad N. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044230, C369S044320, C369S112010, C369S112230

Reexamination Certificate

active

07813235

ABSTRACT:
An optical pickup device includes light sources for respectively emitting a plurality of different wavelengths of light, a unit structured for causing at least a part of the light emitted from the light sources to pass a same optical path; and a focusing unit for focusing the light. The focusing unit includes at least first and second focusing parts, the first focusing part being to focus mainly a wavelength of light different from a wavelength of light to be mainly focused by the second focusing part. The optical pickup device and optical disk device are capable of realizing at least one of thickness reduction, size reduction and suppression against characteristic deterioration even where coping with various wavelengths of laser including a blue laser.

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