Patent ID: 7602679

Claim:
An optical lens to be arranged in an optical information recording and/or reproducing apparatus for conducting at least one of recording information on an optical information recording medium and reproducing information recorded on the optical information recording medium and to converge a light flux emitted by a first laser light source with wavelength of 390 nm-420 nm onto the optical information recording medium, the optical lens comprising: at least one lens main body; an antireflective film arranged on a first lens surface which has the largest surface angle θ 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 θ 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 a wavelength λ 1 to a wavelength λ 2 and the wavelength λ 1 is in a range of 348-460 nm.