Object lens, optical pickup, and optical disc device

Details Object lens, optical pickup, and optical disc device Object lens, optical pickup, and optical disc device

2011-04-12

2011-04-12

Edun, Muhammad N (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112150, C369S112160, C369S112120, C369S044230, C369S044370

Reexamination Certificate

active

07924684

ABSTRACT:
An optical pickup includes: a first emitting unit to emit an optical beam of a first wavelength; a second emitting unit to emit an optical beam of a second wavelength; a third emitting unit to emit an optical beam of a third wavelength; an object lens to condense optical beams emitted from the first through third emitting units onto a signal recording face of an optical disc; and a diffraction unit provided on one face of an optical element or the object lens positioned on the optical path of the optical beams of the first through third wavelengths; wherein the diffraction unit includes a generally circular first diffraction region provided on the innermost perimeter, a ring zone shaped second diffraction region provided on the outer side of the first diffraction region, and a ring zone shaped third diffraction region provided on the outer side of the second diffraction region.

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Office Action issued Mar. 2, 2010, in Japanese Patent Application No. 2008-196640, filed Jul. 30, 2008.

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