Objective lens

Details Objective lens Objective lens

2004-07-28

2008-08-19

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

07414948

ABSTRACT:
There is provided an objective lens used for a plurality of types of optical discs having a front surface and a rear surface, each of which includes an inner region and an outer region. The outer region has a surface shape which suppresses a coma caused when a beam used for a first optical disc is incident thereon obliquely with respect to an optical axis of the objective lens. The inner region is configured such that, at a boundary position between the inner region and the outer region, the coma caused when a beam used for a second optical disc is incident on the inner region obliquely at a first angle with respect to the optical axis is less than the coma caused when the beam used for the second optical disc is incident on the outer region obliquely at the first angle with respect to the optical axis. Further, an inclination θ2Aof the inner region and an inclination θ2Bof the outer region of the rear surface satisfy a condition:in-line-formulae description="In-line Formulae" end="lead"?−2.5<θ2B−θ2A<0.0.  (1)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 6594222 (2003-07-01), Maruyama
patent: 6747812 (2004-06-01), Ota et al.
patent: 6785203 (2004-08-01), Maruyama et al.
patent: 2001-243651 (2001-09-01), None
patent: 2003-156682 (2003-05-01), None

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