Objective lens and optical information recording/reproducing...

Details Objective lens and optical information recording/reproducing... Objective lens and optical information recording/reproducing...

2011-04-19

2011-04-19

Criado, Jorge L Ortiz (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112260

Reexamination Certificate

active

07929401

ABSTRACT:
An objective lens used for an optical information recording/reproducing apparatus for an optical disc based on a predetermined standard is made of resin and has a numerical aperture larger than or equal to 0.75. When f (unit: mm) represents a focal length at a wavelength λ (unit: nm), d (unit: mm) represents a thickness, and n represents a refractive index of the objective lens at the wavelength λ, the objective lens satisfies following conditions:in-line-formulae description="In-line Formulae" end="lead"?1.00<f<1.50  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.55<d·n/f<1.82  (2).in-line-formulae description="In-line Formulae" end="tail"?At least a light source side surface of the objective lens is an aspherical surface. The objective lens satisfies a following condition:in-line-formulae description="In-line Formulae" end="lead"?2.80<(SAG1)′MAX·n<4.10  (3),in-line-formulae description="In-line Formulae" end="tail"?where (SAG1)′MAXrepresents a maximum gradient of a gradient (SAG1)′ of a sag amount SAG of the aspherical surface at the light source side within an effective beam diameter.

REFERENCES:
patent: 6819504 (2004-11-01), Maruyama
patent: 7110344 (2006-09-01), Kimura
patent: 2007/0286054 (2007-12-01), Koizumi et al.
patent: 2007/0297314 (2007-12-01), Koreeda et al.
patent: 2008/0106998 (2008-05-01), Ito
patent: 2008/0165436 (2008-07-01), Koreeda et al.
patent: 2009/0154325 (2009-06-01), Inoue et al.
patent: 2009/0252021 (2009-10-01), Inoue et al.
patent: 2003-5032 (2003-01-01), None
patent: 2005-156719 (2005-06-01), None
English language Abstract JP 2005-156719, Jun. 16, 2005.
English language Abstract JP 2003-5032, Jan. 8, 2003.

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