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US 2003/0147148 A1Published application
Objective optical system for optical pick-up
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorWataru Kubo
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AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorWataru Kubo
Estimating the term…
A single-element objective lens for an optical pick-up is configured to converge substantially parallel light rays incident thereon onto a data recording surface of an optical recording medium. The objective lens includes, a first surface, which is a light incident side surface, and a second surface, which is an optical recording medium side surface. The first surface is an aspherical surface having a positive power, and the second surface is an aspherical surface having positive or negative power. The objective lens is designed such that paraxial wavefront aberration is 0.07λ rms or less when a decentering amount between the first and second surfaces is 2 μm or less so as to converge the incident light substantially to a diffraction limit. A numerical aperture of the objective lens is 0.8 or more.
A single-element objective lens for an optical pick-up, said objective lens converging substantially parallel light incident thereon onto a data recording surface of an optical recording medium, a first surface, which is a light incident side surface, of said objective lens being an aspherical surface having a positive power, a second surface, which is an optical recording medium side surface, of said objective lens being an aspherical surface having one of positive and negative power, paraxial wavefront aberration being 0.07λ rms or less when a decentering amount between said first and second surfaces is 2 μm or less so as to converge the incident light substantially to a diffraction limit, a numerical aperture of said objective lens being 0.8 or more.
Dependencies are inferred from the claim text.