Objective lens for optical pick-up

Details Objective lens for optical pick-up Objective lens for optical pick-up

2007-07-03

2007-07-03

Huber, Paul W. (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

10867736

ABSTRACT:
There is provided an objective lens for an optical pick-up which is used to record/reproduce data to/from at least three types of optical discs. Thicknesses t1, t2and t3of cover layers of first, second third optical discs are t1≅0.6 mm, t2≅0.6 mm, and t3≅1.2 mm. Numerical apertures NA1, NA2and NA3for the first, second and third optical discs satisfy a relationship NA1≧NA2>NA3. When the first optical disc is used, a substantially collimated light beam is incident on the objective lens. When the second or third optical disc is used, a diverging beam is incident on the objective lens. With regard to magnifications M1, M2and M3and focal lengths f1, f2and f3of the objective lens for the first, second and third optical discs, the following conditions (1), (2) and (3) are satisfied:in-line-formulae description="In-line Formulae" end="lead"?−0.02<f1×M1<0.02  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−0.10<f2×M2<−0.04  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−0.29<f3×M3<−0.19.  (3)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 6118594 (2000-09-01), Maruyama
patent: 6449095 (2002-09-01), Ohtaki et al.
patent: 6587272 (2003-07-01), Nakai
patent: 2001/0008513 (2001-07-01), Arai et al.
patent: 2000-81566 (2000-03-01), None
patent: 2001-75118 (2000-03-01), None
patent: 2001-93179 (2001-04-01), None
patent: 2001-195769 (2001-07-01), None

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