Optical system of optical pick-up and optical information...

Details Optical system of optical pick-up and optical information... Optical system of optical pick-up and optical information...

2010-10-28

2011-12-20

Bibbins, Latanya (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112260, C369S044320, C359S719000

Reexamination Certificate

active

08081558

ABSTRACT:
An optical system of an optical pick-up including a resin coupling lens and a resin objective lens with NA larger than 0.8, wherein, magnification β satisfies a condition: −0.13<β<−0.08, a focal length f of the objective lens satisfies a condition: 1.15<f<1.50, the objective lens has an annular zone structure on at least one surface of the objective lens, and the annular zone structure has a plurality of annular zones and has steps each of which extends in a direction of an optical axis of the objective lens and is formed at a boundary between adjacent ones of the plurality of annular zones to cause a predetermined optical path length difference between a light beam passing inside the boundary and a light beam passing outside the boundary, and the optical system of an optical pick-up satisfies a condition:0.065<((∑Φ0.95-1.00)(∑Φ0.00-1.00)×d0×nf2×(NA0.85)4)Pave+1L<0.100whereL=L0+(1-cos⁢⁢θ)L0=m⁢⁢λn-1.

REFERENCES:
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patent: 2005/0254399 (2005-11-01), Kimura
patent: 2006/0002279 (2006-01-01), Okamura
patent: 2008/0137517 (2008-06-01), Maezawa et al.
patent: 2010/0128592 (2010-05-01), Kimura
patent: 2008-176916 (2008-07-01), None
patent: 4193914 (2008-12-01), None
patent: 2009-117030 (2009-05-01), None

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