Optical disk device

An optical disk device reproducing information recorded on a signal recording surface of a plurality of layers of an optical disk, comprising:

• information reading means (60) for illuminating said optical disk (1) with a beam and detecting light reflected from said optical disk (1) to read said information;
• drive means (12, 13) for moving said information reading means (60) along the signal recording surface;
• acceleration means (55), when said information reading means (60) is focusing on a signal recording surface of one of said plurality of layers, for generating an acceleration signal for allowing said information reading means (60) to focus on a recording surface of another of said plurality of layers;
• operation means (55) responsive to provision of a targeted address and targeted layer information for calculating a shift in position of said information reading means (60) from a current address and layer information having information being read by said information reading means;
• and
• control means (55) for driving said drive means to move said information reading means by the shift in position calculated by said operation means and for allowing said acceleration means to generate and provide said acceleration signal to said information reading means to allow said information reading means to focus on a signal recording layer of said targeted layer.