Optical pickup device and objective lens for the optical...

Details Optical pickup device and objective lens for the optical... Optical pickup device and objective lens for the optical...

2007-03-20

2007-03-20

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

C369S112050, C369S112230, C369S044230, C369S044370

Reexamination Certificate

active

10805730

ABSTRACT:
An optical pickup apparatus includes first, second and third light sources; a light converging optical system including a first objective optical element and a second objective optical element, wherein the first objective optical element converges the light flux emitted from the first light source on a first information recording surface, the second objective optical element converges the light flux emitted from the third light source on a third information recording surface, and the first objective optical element or the second objective optical element converges the light flux emitted from the second light source on a second information recording surface; a lens holder holding the first objective optical element and the second objective element therein; and a chromatic aberration correcting element which corrects a chromatic aberration caused by a wavelength variation in a light flux emitted by the first light source.

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patent: 6898168 (2005-05-01), Kimura et al.
patent: 2003/0185136 (2003-10-01), Kaiho et al.

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