Patent ID: 7355954

Claim:
An optical pickup device comprising: a hologram for CD having a region for separating a luminous flux, which is used at least for tracking control, from a beam of reflected light which is emitted from a light source for CD and reflected on CD and which conducts at least one of the recording and reproducing of information by irradiating a laser beam on CD; and a hologram for DVD having a first region for separating a luminous flux, which is used at least for tracking control, from a beam of reflected light which is emitted from a light source for DVD and reflected on DVD and which conducts at least one of the recording and reproducing of information by irradiating a laser beam on DVD, the hologram for DVD also having a second region for separating a luminous flux which is used for correcting the tracking control, said second region being divided in parallel to the tangential direction of DVD, and said second region being divided into at least two portions arranged symmetrically to each other with respect to a center line in the radial direction of DVD.