Optical lens and information recording and reproducing device

Details Optical lens and information recording and reproducing device Optical lens and information recording and reproducing device

2004-07-07

2009-10-13

Edun, Muhammad N. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112230

Reexamination Certificate

active

07602679

ABSTRACT:
An optical lens to be arranged in an optical information recording and/or reproducing apparatus includes at least one lens main body; an antireflective film arranged on a first lens surface which has the largest surface angle on an outer peripheral portion in an effective radius of lens surfaces on the lens main body; wherein for a light entering perpendicularly to a central portion of the first lens surface whose central portion has a surface angle of 0 degree, a spectral reflectance of the antireflective film has one or more regions in which the spectral reflectance is continuously 4% or below and the wavelength includes at least a part of a wavelength region of 300 to 1000 nm, the broadest wavelength region of the one or more wavelength regions extends from wavelength λ1to wavelength λ2and the wavelength λ1is in a range of 348-460 nm.

REFERENCES:
patent: 5473594 (1995-12-01), Miyazawa
patent: 6388822 (2002-05-01), Kitamura et al.
patent: 6819498 (2004-11-01), Watanabe et al.
patent: 2002/0191168 (2002-12-01), Ishizawa et al.

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