Patent ID: 7228553

Claim:
An optical pickup actuator comprising: a base; a bobbin in which a through hole is formed; an objective lens attached to the bobbin; a holder provided on the base to support the bobbin; a lens holder inserted in the through hole of the bobbin to support the objective lens, wherein the lens holder is made of a material having a heat conduction coefficient lower than that of the bobbin; a plurality of suspensions, each suspension having one end coupled to the bobbin and the other end attached to the holder provided on the base, to support the bobbin; and a driving unit having a coil installed at the bobbin and a magnet installed on the base to drive the bobbin with an electromagnetic force generated by interaction of current flowing in the coil and a magnetic field formed by the magnet, wherein the lens holder is a ring shape further comprising: a step portion that is formed on an inner circumference of the lens holder in which to accommodate an edge of the objective lens, and a pair of buffer protrusions outwardly extended from a periphery of the lens holder, each of the buffer protrusions having a hemispherically shaped upper end portion.