Patent ID: 8085645
Filing Date: 2011-12-27
Classification: G11B

Abstract:
1. An optical pickup device, comprising: a first laser element that emits first laser light; a second laser element that emits second laser light of which the wavelength is longer than that of the first laser light; an optical path composition element that composes the first laser light and the second laser light to one optical path; a wavelength selective element that acts on the composed first or second laser light through which the composed first or second laser light passes; and an objective lens that condenses the first laser light and the second laser light on an optical disk, wherein: the magnitude of the power of the wavelength selective element as a lens with respect to the second laser light is larger than the magnitude of the power of the wavelength selective element as a lens with respect to the first laser light, and the wavelength selective element is formed of a lens that includes a second member and a first member of which a boundary surface is formed in the shape of a lens and is formed by adding dyes or pigments to the first or second member so that a difference between the refractive indexes of the first and second members in the first wavelength is different from a difference between the refractive indexes of the first and second members in the second wavelength.