Optical pickup and disc drive apparatus

The disc drive apparatus for selectively playing at least two disc-shaped recording mediums of different types, comprising:

• a disc table for selectively mounting the disc-shaped recording mediums thereon;
• and
• an optical pickup for selectively applying at least two laser beams having respective wavelengths to one of the disc-shaped recording mediums selectively mounted on said disc table;
• said optical pickup comprising:
• a movable base movable radially across the disc-shaped recording mediums selectively mounted on the disc table;
• and
• an objective lens actuator mounted on said movable base;
• said objective lens actuator comprising:
• a fixed block fixedly mounted on said movable base;
• a movable block movable with respect to said fixed block in focusing directions toward and away from recording surfaces of the disc-shaped recording mediums and tracking directions which are substantially radial directions of the disc-shaped recording mediums;
• a first objective lens mounted on said movable block for focusing a first laser beam onto the recording surface of one of the disc-shaped recording mediums;
• and
• a second objective lens mounted on said movable block for focusing a second laser beam, which has a wavelength shorter than said first laser beam, onto the recording surface of another one of the disc-shaped recording mediums which is different in type from said one of the disc-shaped recording mediums;
• said first objective lens and said second objective lens being spaced from each in a tangential direction of recording tracks on the disc-shaped recording mediums which is perpendicular to said focusing directions and said tracking directions;
• said first or second objective lens having a center positioned on a line which passes through the center of the disc-shaped recording mediums selectively mounted on the disc table and which extends in the radial directions of the disc-shaped recording mediums;
• said first objective lens having a center positioned on a line which passes through the center of said second objective lens and which extends in said tangential direction.