Patent ID: 7936645

Claim:
An optical disc drive for reading and/or writing data from/on an optical disc with multiple information layers including first and second information layers, the optical disc being a hybrid optical disc in which in reading data from the first information layer with a light beam, wavelength and/or numerical aperture for the light beam are/is different from the one(s) used to read data from the second information layer, the drive comprising: a light source that emits the light beam; an objective lens that converges the light beam; perpendicular move means for moving the objective lens perpendicularly to the information layers; converged state detecting means for generating a signal representing how much the light beam has been converged on a target one of the information layers; and focus control means for forming a focal point of the light beam on the target information layer by driving the perpendicular move means in accordance with the signal, wherein while a focus jump is being made to shift the focal point of the light beam from the first information layer of the optical disc to the second information layer thereof by driving the perpendicular move means and moving the objective lens, wavelengths and/or numerical apertures for the light beam are changeable while the objective lens is moving.