Objective lens having a doublet lens with high numerical...

Details Objective lens having a doublet lens with high numerical... Objective lens having a doublet lens with high numerical...

G - Physics

02

B

G02B 3/04 (2006.01) G02B 11/02 (2006.01) G11B 7/12 (2006.01) G11B 7/13 (2006.01) G11B 7/135 (2006.01) G11B 7/125 (2006.01)

Patent

CA 2218675

An objective lens having a doublet structure and a number of apertures of 0.7 or more and an optical pickup apparatus having the objective lens to be adaptable to a optical recording medium having a high information recording density, the objective lens being structured such that at least one side is formed into a aspheric surface and the lens elements are made of low-diffusion glass having an Abbe's number of 40 or greater.

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