Objective lens, optical pickup device, and optical...

Details Objective lens, optical pickup device, and optical... Objective lens, optical pickup device, and optical...

2011-08-09

2011-08-09

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S718000, C359S720000, C369S112010, C369S112230

Reexamination Certificate

active

07995290

ABSTRACT:
An objective lens for converging light emitted from a light source on an optical recording medium to record and reproduce information consists of a single lens having at least one aspheric surface. The following conditional expressions (1) to (3) are satisfied:in-line-formulae description="In-line Formulae" end="lead"?N≦1.75  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.5<f/f1<0.6  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.8<d/(NA·De)<1.0  (3)in-line-formulae description="In-line Formulae" end="tail"?whereN denotes a refractive index,f denotes a focal length (mm),f1denotes a focal length (mm) of a light source side surface,d denotes a thickness (mm) on an optical axis,NA denotes a numerical aperture on an optical recording medium side, andDe denotes an effective aperture (mm) of the light source side surface.

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Chinese Office Action for Application No. 200910141264.8 dated May 12, 2010.

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