Patent ID: 8687475

Claim:
An optical pickup device comprising a laser diode and a lens actuator, the lens actuator comprising: an objective lens; a fixed portion; a movable portion that supports the objective lens, configured to change the position and orientation of the objective lens with respect to the fixed portion; a magnetic field generator configured to apply magnetic force to at least part of the movable portion; and first and second elastic supporting members that couple the movable portion elastically to the fixed portion, and wherein when viewed parallel to the optical axis of the objective lens, a first point of connection between the first elastic supporting member and the fixed portion, a second point of connection between the first elastic supporting member and the movable portion, a third point of connection between the second elastic supporting member and the fixed portion, and a fourth point of connection between the second elastic supporting member and the movable portion are respectively located at the four vertices of a quadrilateral; the center of the objective lens is located inside of an area that is defined between a first line that passes the first and third points of connection and a second line that passes the second and fourth points of connection and is located outside of an area that is defined between a third line that passes the first and second points of connection and a fourth line that passes the third and fourth points of connection.