Patent ID: 7248545

Claim:
An optical pickup device for reproducing information from an optical disk having a track which is provided with a groove part which is a recessed part and a land part which is a raised part, in which one main spot, a first subspot, and a second subspot are formed by irradiation of light on the optical disk, said optical pickup device comprising: means for generating a push-pull signal which indicates a deviation between each of said spots and the track; and α selecting means for selecting a value of a variable α such that |SPP 1 −αSPP 2 |<Δ, where Δ is a value corresponding to a preset range, SPP 1 is a push-pull signal of said first subspot, and SPP 2 is a push-pull signal of said second subspot, wherein: SPP 1 −αSPP 2 is a land/groove discriminating signal, wherein α is fixed as the value selected by said α selecting means.