Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-08-01
2006-08-01
Korzuch, William (Department: 2653)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112220
Reexamination Certificate
active
07085219
ABSTRACT:
An optical lens for condensing a light emitted from a laser light source on an optical recording medium, the light having a wavelength λ1within a wavelength range from 400 nm to 440 nm, comprises: a light incident side lens surface disposed on a side which the light emitted from the laser light source enters, the light incident side lens surface comprising a peripheral part having an angle θ of 45 degrees or more, where the θ is an angle formed by a normal line at a position on each lens surface and an optical axis; and a first anti-reflection film formed on the light incident side lens surface, the first anti-reflection film having a film thickness which is set so that a wavelength λ2at which a reflectance of the light entering a central part having the angle θ of zero degrees, of the light incident side lens surface at an angle of zero degrees has a local minimum value, satisfies λ1<λ2and 420 nm≦λ2≦680 nm.
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Cohen & Pontani, Lieberman & Pavane
Goma Tawfik
Konica Opto Corporation
Korzuch William
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