Patent ID: 7613100

Claim:
An optical pickup device that emits laser light to a signal recording medium including a label layer, the label layer being capable of recording label information in the form of a visible image through application of laser light, the optical pickup device comprising: a first laser light source and a second laser light source that emit first laser light and second laser light, respectively; and an objective lens that receives the first and second laser light, the objective lens being shared by the first laser light source and the second laser light source, wherein the first laser light and the second laser light have different focal lengths from a principal point of the objective lens in accordance with a distance between a signal layer of the signal recording medium and the label layer of the signal recording medium, and when the first laser light source and the second laser light source are simultaneously driven, the first laser light and the second laser light are controlled to simultaneously focus on the signal layer of the signal recording medium and the label layer of the signal recording medium, respectively, and wherein the first laser light and the second laser light have different wavelengths from each other, and the second laser light has a longer wavelength than that of the first laser light, the wavelength of the second laser light being suitable for a second signal recording medium in which a transparent substrate has a greater thickness, as measured from a surface to a signal layer, than that of the signal recording medium.