Optical pickup, optical element, and information reproducing...

Details Optical pickup, optical element, and information reproducing... Optical pickup, optical element, and information reproducing...

2004-05-07

2008-12-23

Psitos, Aristotelis M (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C359S569000

Reexamination Certificate

active

07468942

ABSTRACT:
An optical pickup has a light source for emitting a plurality of laser beams with different wavelengths; and an objective lens for focusing the laser beams emitted from the light source on recording surfaces of plural types of information recording media. A diffractive lens structure is provided in a light path of the laser beam, the structure including ring zone areas divided by a plurality of phase steps for correcting a wavefront aberration of the laser beam, a diameter of an outermost phase step of the diffractive lens structure is smaller than a second largest effective diameter of effective diameters required for reproduction of the plural types of information recording media.

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patent: 2001/0008513 (2001-07-01), Arai et al.
patent: 2000-081566 (2000-03-01), None
patent: 2000-260056 (2000-09-01), None
patent: 2001-195769 (2001-07-01), None

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