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Objective lens, optical pickup and optical disk apparatus

Image Number 17 for United States Patent #8116188.

A plastic objective lens is configured to collect a light beam with at least a wavelength .lamda. on a recording layer of an optical disk and is used in an optical pickup for recording and/or reproducing an information signal by illuminating a light beam on the optical disk having one or a plurality of recording layers in an incident direction of the light beam.

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