Objective lens and optical pickup apparatus

Details Objective lens and optical pickup apparatus Objective lens and optical pickup apparatus

2005-03-30

2009-06-30

Amari, Alessandro (Department: 2872)

Optical: systems and elements

Light interference

Produced by coating or lamina

C359S359000

Reexamination Certificate

active

07554736

ABSTRACT:
An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens containing a lens body made of a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7.

REFERENCES:
patent: 5106920 (1992-04-01), Murakami et al.
patent: 6819498 (2004-11-01), Watanabe et al.
patent: 6964806 (2005-11-01), Tazaki
patent: 2004/0242824 (2004-12-01), Miyaki et al.

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