Patent ID: 7835237

Claim:
An optical pickup device comprising: a light beam emitting device that emits five light beams: (i) a main beam, (ii) a first inner sub-beam, (iii) a second inner sub-beam, (iv) a first outer sub-beam, and (v) a second outer sub-beam; a light condensing device that condenses the five light beams at positions on an optical recording medium, shifted by a predetermined amount in the circumferential direction of a wobble recording track from a radius axis passing through a center point of the recording track of the optical recording medium; a light receiving device that receives reflection beams of the five light beams from the optical recording medium, and outputs light reception signals corresponding to the beams; a generating device that (a) generates an inner signal for use in at least any one of tracking correction and crosstalk cancellation from the light reception signals corresponding to the main beam, the first inner sub-beam, and the second inner sub-beam, and (b) generates an outer signal for use in at least one of tracking correction and crosstalk cancellation from the light reception signals corresponding to the main beam, the first outer sub-beam, and the second outer sub-beam; and a sum signal generating device that multiplies each of the inner and outer signals with a coefficient and thereafter generates a sum signal of the inner and outer signals multiplied with the coefficients.