Objective lens and optical pickup device using it

Details Objective lens and optical pickup device using it Objective lens and optical pickup device using it

2007-10-23

2007-10-23

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112230

Reexamination Certificate

active

10988638

ABSTRACT:
An objective lens is formed as an objective lens element with a diffractive surface on one side. The objective lens focuses a collimated light beam of a first wavelength diffracted by the objective lens onto a first recording medium, a collimated light beam of a second wavelength diffracted by the objective lens onto a second recording medium, and a diverging light beam of a third wavelength diffracted by the objective lens onto a third recording medium. The three light beams are focused at three different working distances from the objective lens and the diffraction orders of the diffracted light of two of the light beams is the same. The objective lens satisfies certain conditions related to the shortest of the three different working distances, the focal length of the objective lens element at the shortest of the three wavelengths, and the thickness of the objective lens.

REFERENCES:
patent: 7206276 (2007-04-01), Kimura et al.
patent: 2001/0008513 (2001-07-01), Arai et al.
patent: 2004/0047269 (2004-03-01), Ikenaka et al.
patent: 2004/0170106 (2004-09-01), Komma

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